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1.
Braz. j. biol ; 82: e247073, 2022. tab, graf
Artigo em Inglês | LILACS, VETINDEX | ID: biblio-1249224

Resumo

In Northern Tunisia, seasonal streams, called wadi, are characterized by extreme hydrological and thermal conditions. These freshwater systems have very particular features as a result of their strong irregularity of flow due to limited precipitation runoff regime, leading to strong seasonal hydrologic fluctuations. The current study focused on the spatio-temporal distribution of chironomids in 28 sampling sites spread across the Northern Tunisia. By emplying PERMANOVA, the results indicated a significant spatio-temporal variation along various environmental gradients. The main abiotic factors responsible for noted differences in the spatial distribution of chironomids in wadi were the conductivity and temperature, closely followed by altitude, pH, salinity, talweg slope and dissolved oxygen, identified as such by employing distance-based linear models' procedure. The Distance-based redundancy analysis ordination showed two main groups: the first clustered the Bizerte sites, which were characterized by high water conductivity, sodium concentration and salinity. The second main group comprised sites from the Tell zone and was characterized by low temperatures, neutral pH, low conductivity and nutrients content. The subfamily TANYPODIINAE (e.g., Prochladius sp., Prochladius choerus (Meigen, 1804) and Macropelopia sp.) was the dominant group at Tell zone, whereas species such as Diamesa starmachi (Kownacki et Kownacha, 1970) and Potthastia gaedii (Meigen, 1838) were found only in Tell Wadis. In contrast, chironomid species such as Diamesa starmachi (Kownacki et Kownacha, 1970), Potthastia gaedii (Meigen, 1838), Procladius choreus (Meigen, 1804) were specific for Tell Mountain. Cap Bon wadis region was dominated by genus Cladotanytarsus sp. The results of this survey liked the taxonomic composition of chironomid assemblages to the variation of hydromorphological and physic-chemical gradients across the northern Tunisia wadis.


No norte da Tunísia, riachos sazonais chamados wadi são caracterizados por condições hidrológicas e térmicas extremas. Esses sistemas de água doce têm características muito particulares como resultado de sua forte irregularidade de fluxo devido ao regime de escoamento de precipitação limitado, levando a fortes flutuações hidrológicas sazonais. O estudo atual enfocou a distribuição espaço-temporal dos quironomídeos em 28 locais de amostragem espalhados pelo norte da Tunísia. Ao aplicar PERMANOVA, os resultados indicaram uma variação espaço-temporal significativa ao longo de vários gradientes ambientais. Os principais fatores abióticos responsáveis pelas diferenças observadas na distribuição espacial dos quironomídeos no wadi foram a condutividade e a temperatura, seguidos de perto por altitude, pH, salinidade, declive do talvegue e oxigênio dissolvido, identificados como tais empregando o procedimento de modelos lineares baseados na distância. A ordenação da análise de redundância baseada em distância mostrou dois grupos principais: o primeiro agrupou os sítios Bizerte, que foram caracterizados por alta condutividade da água, concentração de sódio e salinidade. O segundo grupo principal compreendia locais da zona de Tell e era caracterizado por baixas temperaturas, pH neutro, baixa condutividade e conteúdo de nutrientes. A subfamília Tanypodiinae (por exemplo, Prochladius sp., Prochladius choerus [Meigen, 1804] e Macropelopia sp.) era o grupo dominante na zona de Tell, enquanto espécies como Diamesa starmachi (Kownacki et Kownacha, 1970) e Potthastia gaedii (Meigen, 1838) foram encontradas apenas em Tell Wadis. Em contraste, espécies de quironomídeos, como Diamesa starmachi (Kownacki et Kownacha, 1970), Potthastia gaedii (Meigen, 1838), Procladius choreus (Meigen, 1804), eram específicas para Tell Mountain. A região de Cap Bon wadis foi dominada pelo gênero Cladotanytarsus sp. Os resultados desta pesquisa gostaram da composição taxonômica das assembleias de quironomídeos com a variação dos gradientes hidromorfológicos e físico-químicos nos wadis do norte da Tunísia.


Assuntos
Animais , Chironomidae , Temperatura , Tunísia , Rios , Água Doce
2.
Zoologia (Curitiba, Impr.) ; 39: e22015, 2022. tab, graf, ilus
Artigo em Inglês | VETINDEX | ID: biblio-1410372

Resumo

In low-order streams, the processing of allochthonous leaf litter is essential in the carbon/energy flow dynamics. Benthic macroinvertebrates, such as chironomids, play critical roles in the breakdown of allochthonous materials, because their larvae take part in intricate trophic networks and have varied trophic ecologies. We evaluated the effects of intra-annual variability on the input of allochthonous leaf litter, and the interactions of leaf-detritus on the succession of Chironomidae assemblages in the dry, rainy, and transition seasons (rainy-dry and dry-rainy). The study took place in a stream in the Brazilian Cerrado. Leaves were incubated in the stream to ascertain the colonization process by Chironomidae and the loss of leaf litter mass after 90 days. Functional feeding groups (FFG) were less rich and less abundant in the dry and dry-rainy seasons, than in the other seasons. The FFG composition of Chironomidae demonstrated that temporal variation between seasons was affected by the exposure time of the leaf-detritus in the stream, and there was more segregation during the dry and rainy seasons. In conclusion, the colonization of leaf-detritus by Chironomidae larvae depended on how long allochthonous plant material remained in the stream, and the variability of the organic matter dynamics input into the stream.


Assuntos
Animais , Fauna Bentônica , Chironomidae/classificação , Serrapilheira , Fatores de Tempo , Brasil
3.
Braz. j. biol ; 82: 1-12, 2022. map, tab, graf
Artigo em Inglês | LILACS, VETINDEX | ID: biblio-1468459

Resumo

In Northern Tunisia, seasonal streams, called wadi, are characterized by extreme hydrological and thermal conditions. These freshwater systems have very particular features as a result of their strong irregularity of flow due to limited precipitation runoff regime, leading to strong seasonal hydrologic fluctuations. The current study focused on the spatio-temporal distribution of chironomids in 28 sampling sites spread across the Northern Tunisia. By emplying PERMANOVA, the results indicated a significant spatio-temporal variation along various environmental gradients. The main abiotic factors responsible for noted differences in the spatial distribution of chironomids in wadi were the conductivity and temperature, closely followed by altitude, pH, salinity, talweg slope and dissolved oxygen, identified as such by employing distance-based linear models' procedure. The Distance-based redundancy analysis ordination showed two main groups: the first clustered the Bizerte sites, which were characterized by high water conductivity, sodium concentration and salinity. The second main group comprised sites from the Tell zone and was characterized by low temperatures, neutral pH, low conductivity and nutrients content. The subfamily TANYPODIINAE (e.g., Prochladius sp., Prochladius choerus (Meigen, 1804) and Macropelopia sp.) was the dominant group at Tell zone, whereas species such as Diamesa starmachi (Kownacki et Kownacha, 1970) and Potthastia gaedii (Meigen, 1838) were found only in Tell Wadis. In contrast, chironomid species such as Diamesa starmachi (Kownacki et Kownacha, 1970), Potthastia gaedii (Meigen, 1838), Procladius choreus (Meigen, 1804) were specific for Tell Mountain. Cap Bon wadis region was dominated by genus Cladotanytarsus sp. The results of this survey liked the taxonomic composition of chironomid assemblages to the variation of hydromorphological and physic-chemical gradients across the northern Tunisia wadis.


No norte da Tunísia, riachos sazonais chamados wadi são caracterizados por condições hidrológicas e térmicas extremas. Esses sistemas de água doce têm características muito particulares como resultado de sua forte irregularidade de fluxo devido ao regime de escoamento de precipitação limitado, levando a fortes flutuações hidrológicas sazonais. O estudo atual enfocou a distribuição espaço-temporal dos quironomídeos em 28 locais de amostragem espalhados pelo norte da Tunísia. Ao aplicar PERMANOVA, os resultados indicaram uma variação espaço-temporal significativa ao longo de vários gradientes ambientais. Os principais fatores abióticos responsáveis pelas diferenças observadas na distribuição espacial dos quironomídeos no wadi foram a condutividade e a temperatura, seguidos de perto por altitude, pH, salinidade, declive do talvegue e oxigênio dissolvido, identificados como tais empregando o procedimento de modelos lineares baseados na distância. A ordenação da análise de redundância baseada em distância mostrou dois grupos principais: o primeiro agrupou os sítios Bizerte, que foram caracterizados por alta condutividade da água, concentração de sódio e salinidade. O segundo grupo principal compreendia locais da zona de Tell e era caracterizado por baixas temperaturas, pH neutro, baixa condutividade e conteúdo de nutrientes. A subfamília Tanypodiinae (por exemplo, Prochladius sp., Prochladius choerus [Meigen, 1804] e Macropelopia sp.) era o grupo dominante na zona de Tell, enquanto espécies como Diamesa starmachi (Kownacki et Kownacha, 1970) e Potthastia gaedii (Meigen, 1838) foram encontradas apenas em Tell Wadis. Em contraste, espécies de quironomídeos, como Diamesa starmachi (Kownacki et Kownacha, 1970), Potthastia gaedii (Meigen, 1838), Procladius choreus (Meigen, 1804), eram específicas para Tell Mountain. A região de Cap Bon wadis [...].


Assuntos
Animais , Chironomidae/crescimento & desenvolvimento , Demografia , Distribuição Animal/classificação , Distribuição Temporal
4.
Braz. J. Biol. ; 82: 1-12, 2022. mapas, tab, graf
Artigo em Inglês | VETINDEX | ID: vti-31620

Resumo

In Northern Tunisia, seasonal streams, called wadi, are characterized by extreme hydrological and thermal conditions. These freshwater systems have very particular features as a result of their strong irregularity of flow due to limited precipitation runoff regime, leading to strong seasonal hydrologic fluctuations. The current study focused on the spatio-temporal distribution of chironomids in 28 sampling sites spread across the Northern Tunisia. By emplying PERMANOVA, the results indicated a significant spatio-temporal variation along various environmental gradients. The main abiotic factors responsible for noted differences in the spatial distribution of chironomids in wadi were the conductivity and temperature, closely followed by altitude, pH, salinity, talweg slope and dissolved oxygen, identified as such by employing distance-based linear models' procedure. The Distance-based redundancy analysis ordination showed two main groups: the first clustered the Bizerte sites, which were characterized by high water conductivity, sodium concentration and salinity. The second main group comprised sites from the Tell zone and was characterized by low temperatures, neutral pH, low conductivity and nutrients content. The subfamily TANYPODIINAE (e.g., Prochladius sp., Prochladius choerus (Meigen, 1804) and Macropelopia sp.) was the dominant group at Tell zone, whereas species such as Diamesa starmachi (Kownacki et Kownacha, 1970) and Potthastia gaedii (Meigen, 1838) were found only in Tell Wadis. In contrast, chironomid species such as Diamesa starmachi (Kownacki et Kownacha, 1970), Potthastia gaedii (Meigen, 1838), Procladius choreus (Meigen, 1804) were specific for Tell Mountain. Cap Bon wadis region was dominated by genus Cladotanytarsus sp. The results of this survey liked the taxonomic composition of chironomid assemblages to the variation of hydromorphological and physic-chemical gradients across the northern Tunisia wadis.(AU)


No norte da Tunísia, riachos sazonais chamados wadi são caracterizados por condições hidrológicas e térmicas extremas. Esses sistemas de água doce têm características muito particulares como resultado de sua forte irregularidade de fluxo devido ao regime de escoamento de precipitação limitado, levando a fortes flutuações hidrológicas sazonais. O estudo atual enfocou a distribuição espaço-temporal dos quironomídeos em 28 locais de amostragem espalhados pelo norte da Tunísia. Ao aplicar PERMANOVA, os resultados indicaram uma variação espaço-temporal significativa ao longo de vários gradientes ambientais. Os principais fatores abióticos responsáveis pelas diferenças observadas na distribuição espacial dos quironomídeos no wadi foram a condutividade e a temperatura, seguidos de perto por altitude, pH, salinidade, declive do talvegue e oxigênio dissolvido, identificados como tais empregando o procedimento de modelos lineares baseados na distância. A ordenação da análise de redundância baseada em distância mostrou dois grupos principais: o primeiro agrupou os sítios Bizerte, que foram caracterizados por alta condutividade da água, concentração de sódio e salinidade. O segundo grupo principal compreendia locais da zona de Tell e era caracterizado por baixas temperaturas, pH neutro, baixa condutividade e conteúdo de nutrientes. A subfamília Tanypodiinae (por exemplo, Prochladius sp., Prochladius choerus [Meigen, 1804] e Macropelopia sp.) era o grupo dominante na zona de Tell, enquanto espécies como Diamesa starmachi (Kownacki et Kownacha, 1970) e Potthastia gaedii (Meigen, 1838) foram encontradas apenas em Tell Wadis. Em contraste, espécies de quironomídeos, como Diamesa starmachi (Kownacki et Kownacha, 1970), Potthastia gaedii (Meigen, 1838), Procladius choreus (Meigen, 1804), eram específicas para Tell Mountain. A região de Cap Bon wadis [...].(AU)


Assuntos
Animais , Chironomidae/crescimento & desenvolvimento , Demografia , Distribuição Temporal , Distribuição Animal/classificação
5.
Iheringia. Sér. Zool. ; 111: e2021005, 2021. mapas, graf
Artigo em Inglês | VETINDEX | ID: vti-30413

Resumo

Stream insects use in different ways the stream habitats which affect patterns of species occurrence on stream. The nestedness is one of these patterns being an ecological mechanism that generates beta diversity. In this study, we verify the effects of temporal environmental variations on nestedness patterns of Chironomidae assemblages on subtropical streams. We collected chironomid larvae during winter and summer during three years (2010, 2011 and 2012) in Brazilian Subtropical low-order streams (Erechim, state of Rio Grande do Sul, Brazil). We measured environmental variables in each stream. To assess if assemblages will show nested patterns intra- and interannual we used a NODF metric. We observed nestedness only in one year, this pattern was due to variation of limnological factors, which are directly associated with climatic conditions (precipitation and water temperature) and agricultural management (e.g. dissolved oxygen and nutrients). Climatological events affect Chironomidae community through the time. The variations on precipitation values could be one of the mainly factors that influence nestedness for this community. Finally, studies on nesting on time scales should consider inter-annual comparisons, as climatic variations are more evident.(AU)


Assuntos
Animais , Chironomidae/classificação , Chironomidae/crescimento & desenvolvimento , Ecossistema , Biodiversidade , Mudança Climática
6.
Iheringia, Sér. zool ; 111: e2021005, 2021. map, graf
Artigo em Inglês | VETINDEX | ID: biblio-1483410

Resumo

Stream insects use in different ways the stream habitats which affect patterns of species occurrence on stream. The nestedness is one of these patterns being an ecological mechanism that generates beta diversity. In this study, we verify the effects of temporal environmental variations on nestedness patterns of Chironomidae assemblages on subtropical streams. We collected chironomid larvae during winter and summer during three years (2010, 2011 and 2012) in Brazilian Subtropical low-order streams (Erechim, state of Rio Grande do Sul, Brazil). We measured environmental variables in each stream. To assess if assemblages will show nested patterns intra- and interannual we used a NODF metric. We observed nestedness only in one year, this pattern was due to variation of limnological factors, which are directly associated with climatic conditions (precipitation and water temperature) and agricultural management (e.g. dissolved oxygen and nutrients). Climatological events affect Chironomidae community through the time. The variations on precipitation values could be one of the mainly factors that influence nestedness for this community. Finally, studies on nesting on time scales should consider inter-annual comparisons, as climatic variations are more evident.


Assuntos
Animais , Biodiversidade , Chironomidae/classificação , Chironomidae/crescimento & desenvolvimento , Ecossistema , Mudança Climática
7.
Acta amaz. ; 50(4): 313-316, out.-dez. 2020. ilus, tab
Artigo em Inglês | VETINDEX | ID: vti-760199

Resumo

Denopelopia amicitia Dantas, Hamada & Mendes was described based on the male and pupae collected in the Brazilian Amazon. Here we describe and illustrate the female and larva of this species. At both stages, D. amicitia is similar to Denopelopia atria Roback & Rutter, which is the only species in the genus with all life stages known until now.(AU)


Denopelopia amicitia Dantas, Hamada & Mendes foi descrita com base no macho e na pupa coletados na Amazônia brasileira. Aqui descrevemos e ilustramos a fêmea e a larva desta espécie. Em ambos os estágios, D. amicitia é similar à Denopelopia atria Roback & Rutter, que é a única espécie do gênero com todos os estágios de vida conhecidos até agora.(AU)


Assuntos
Animais , Feminino , Chironomidae/classificação , Chironomidae/crescimento & desenvolvimento
8.
Braz. J. Biol. ; 80(4): 735-740, Oct.-Dec. 2020. ilus, tab
Artigo em Inglês | VETINDEX | ID: vti-31049

Resumo

The management and use of native species under laboratory conditions is the main difficult for species proposal for its use in bioassays. The present study showed the results about management under controlled conditions of Paratanytarsus grimmii (Diptera: Chironomidae), that is a parthenogenetic species with wide geographical distribution. It obtained its eggs from a pre Andean river from Araucania region (39° S), and it determined the conditions for larval rearing under artificial food, adults getting (manipulation), eggs (hatching sincronization) and larvae getting after hatching. The P.grimmii life cycle had larvae that late 23 days in get the pupa stage (stage I to IV), the adult within the next 48 hours deposits the eggs that hatched at 72 hours. It stablished laboratory conditions: incubation room temperature, water pH, and artificial feeding, photoperiod and larvae and eggs management techniques. In according to obtained results it managed all life cycles under laboratory conditions that can propose the use of this species as potential biological material for toxicity bioassays.(AU)


O manejo e o uso de espécies nativas em condições de laboratório são as principais dificuldades para a proposta de uso de espécies em bioensaios. O presente estudo mostrou os resultados acerca do manejo sob condições controladas de Paratanytarsus grimmii (Diptera: Chironomidae), espécie partenogenética com ampla distribuição geográfica. Foram obtidos seus ovos de um rio pré-andino da região de Araucanía (39º S) e determinadas as condições para criação de larvas sob alimentação artificial, obtenção de adultos (manipulação), de ovos (sincronização de eclosão) e de larvas após a eclosão. O ciclo de vida de P. grimmii teve larvas que, ao final dos 23 dias, atingiram o estágio de pupa (estágio I a IV). O adulto depositou nas 48 horas seguintes os ovos que eclodiram às 72 horas. Foram estabelecidas condições laboratoriais: temperatura da sala de incubação, pH da água e alimentação artificial, fotoperíodo e técnicas de manejo de larvas e ovos. De acordo com os resultados obtidos, foram gerenciados todos os ciclos de vida em condições de laboratório que podem propor o uso dessa espécie como material biológico potencial para bioensaios de toxicidade.(AU)


Assuntos
Animais , Chironomidae , Bioensaio , Toxicidade , Animais de Laboratório
9.
Iheringia. Sér. Zool. ; 110: e2020016, 2020. mapas, tab, graf
Artigo em Inglês | VETINDEX | ID: vti-30728

Resumo

This study aimed to analyse the diversity and composition of benthic macroinvertebrate assemblages in the dry and rainy seasons in a Brazilian Cerrado stream, where it was hypothesized that the dry season has higher diversity and it differs in terms of organism composition in relation to the rainy season. Sampling was carried out in the dry (May and August/2016 and August/2017) and rainy seasons (November/2016 and February and November/2017). Individuals were identified at the family level and classified according to functional feeding group (FFG). There were 3,776 individuals, in which Chironomidae was the most abundant taxon with 2,226 organisms. The FFG with the highest number of individuals and species richness were collector-gatherer and predator, respectively. The species richness was higher in the dry season than in the rainy season. The ordinance generated by NMDS showed that there was no distinction in the composition of the assemblage between the dry and rainy seasons. Seasonal variations do not alter the abundance and composition of the benthic macroinvertebrate assemblage, but the species richness does decrease in rainy seasons.(AU)


Este estudo teve como objetivo analisar a diversidade e a composição da assembleia de macroinvertebrados bentônicos nas estações seca e chuvosa em um riacho do Cerrado Brasileiro, testando a hipótese que a estação seca tem maior diversidade e difere em termos de composição de organismos em relação a estação chuvosa. A coleta foi realizada em estações secas (maio e agosto/2016 e agosto/2017) e chuvosas (novembro/2016 e fevereiro e novembro/2017). Os indivíduos foram identificados em nível de família e classificados de acordo com o grupo funcional alimentar (GFA). Foram identificados 3.776 indivíduos, onde Chironomidae foi o táxon mais abundante com 2.226 organismos. O GFA com maior número de indivíduos e riqueza foram coletor-catador e predador, respectivamente. A riqueza de espécies foi maior na estação seca do que na estação chuvosa. A ordenação gerada pelo NMDS mostrou que não houve distinção na composição da assembleia entre as estações seca e chuvosa. Concluímos que variações sazonais não alteram a abundância e a composição da comunidade de macroinvertebrados bentônicos, mas a riqueza de espécies diminuiu na estação chuvosa.(AU)


Assuntos
Animais , Invertebrados , Biodiversidade , Fauna Bentônica/análise , Chironomidae
10.
Iheringia, Sér. zool ; 110: e2020016, 2020. map, tab, graf
Artigo em Inglês | VETINDEX | ID: biblio-1483362

Resumo

This study aimed to analyse the diversity and composition of benthic macroinvertebrate assemblages in the dry and rainy seasons in a Brazilian Cerrado stream, where it was hypothesized that the dry season has higher diversity and it differs in terms of organism composition in relation to the rainy season. Sampling was carried out in the dry (May and August/2016 and August/2017) and rainy seasons (November/2016 and February and November/2017). Individuals were identified at the family level and classified according to functional feeding group (FFG). There were 3,776 individuals, in which Chironomidae was the most abundant taxon with 2,226 organisms. The FFG with the highest number of individuals and species richness were collector-gatherer and predator, respectively. The species richness was higher in the dry season than in the rainy season. The ordinance generated by NMDS showed that there was no distinction in the composition of the assemblage between the dry and rainy seasons. Seasonal variations do not alter the abundance and composition of the benthic macroinvertebrate assemblage, but the species richness does decrease in rainy seasons.


Este estudo teve como objetivo analisar a diversidade e a composição da assembleia de macroinvertebrados bentônicos nas estações seca e chuvosa em um riacho do Cerrado Brasileiro, testando a hipótese que a estação seca tem maior diversidade e difere em termos de composição de organismos em relação a estação chuvosa. A coleta foi realizada em estações secas (maio e agosto/2016 e agosto/2017) e chuvosas (novembro/2016 e fevereiro e novembro/2017). Os indivíduos foram identificados em nível de família e classificados de acordo com o grupo funcional alimentar (GFA). Foram identificados 3.776 indivíduos, onde Chironomidae foi o táxon mais abundante com 2.226 organismos. O GFA com maior número de indivíduos e riqueza foram coletor-catador e predador, respectivamente. A riqueza de espécies foi maior na estação seca do que na estação chuvosa. A ordenação gerada pelo NMDS mostrou que não houve distinção na composição da assembleia entre as estações seca e chuvosa. Concluímos que variações sazonais não alteram a abundância e a composição da comunidade de macroinvertebrados bentônicos, mas a riqueza de espécies diminuiu na estação chuvosa.


Assuntos
Animais , Biodiversidade , Chironomidae , Fauna Bentônica/análise , Invertebrados
11.
Acta amaz ; 49(2): 118-121, abr. - jun. 2019. ilus
Artigo em Inglês | LILACS, VETINDEX | ID: biblio-1119154

Resumo

Abalesmyia cordeiroi Neubern was originally described based on adult males collected in the Amazon region; therefore, females and immatures of this species are unknown. In the present study, the pupal and larval stages of A. cordeiroi are described and illustrated. In addition, an amendment to the larval diagnosis of Ablabesmyia is provided. (AU)


Ablabesmyia cordeiroi Neubern foi descrita originalmente com base em machos coletados na região amazônica, portanto, a fêmea e os imaturos desta espécie são desconhecidos. No presente estudo, os estágios de pupa e larva de A. cordeiroi são descritos e ilustrados. Além disso, uma emenda à diagnose da larva de Ablabesmyia é fornecida.(AU)


Assuntos
Animais , Feminino , Chironomidae/crescimento & desenvolvimento , Larva/fisiologia , Estágios do Ciclo de Vida/fisiologia , Brasil
12.
Zoologia (Curitiba, Impr.) ; 35: 1-6, 2018. ilus, tab
Artigo em Inglês | VETINDEX | ID: biblio-1504499

Resumo

Phoretic relationships often bring large advantages to epibionts. By attaching themselves to mobile hosts, epibionts are able to: expand their ranges without spending energy, reduce their risk of being predated, and increase their probability of finding food. We assessed the phoretic relationship between the siluriform fish Ancistrus multispinis (Regan, 1912) and the chironomid larva Ichthyocladius sp. in three streams of the Atlantic forest in southeastern Brazil. We evaluated changes in epibiont distribution throughout the body regions of the host and among three different aquatic systems. We had predicted that certain body regions are more prone to support epibiont attachment, and that epibiont prevalence increases with increased host size and quality of the aquatic system. Three streams (Santana, São Pedro and D’Ouro), tributaries of the Guandu River, were sampled during 2010 and 2011. A total of 102 specimens of A. multispinis were collected and analyzed. Epibionts were found in fourteen of fifteen body regions of the host. Observation from scanning electron microscopy revealed that Chironomidae larvae fix themselves to the spicules through the anal prolegs, not at the skin, as previously reported. The amount of epibionts (degree of infestation) was significantly correlated with fish size in the Santana Stream (r = 0.6, p < 0.01), and São Pedro Stream (r = 0.56, p < 0.01), but not in the D’Ouro Stream, the most altered of the three. The pre sence of epibionts on the body of the fish is directly correlated with the availability of spicules on the fish’s body, the largest numbers of infestations being found in structures associated with swimming (caudal and pectoral fins), since the swimming movement can create favorable conditions (e.g., suspension of organic particles, increasing oxygenation) for the epibiont.


Assuntos
Animais , Chironomidae , Distribuição Animal , Peixes-Gato , Simbiose , Brasil , Floresta Úmida
13.
Zoologia (Curitiba) ; 35: 1-6, 2018. ilus, tab
Artigo em Inglês | VETINDEX | ID: vti-18821

Resumo

Phoretic relationships often bring large advantages to epibionts. By attaching themselves to mobile hosts, epibionts are able to: expand their ranges without spending energy, reduce their risk of being predated, and increase their probability of finding food. We assessed the phoretic relationship between the siluriform fish Ancistrus multispinis (Regan, 1912) and the chironomid larva Ichthyocladius sp. in three streams of the Atlantic forest in southeastern Brazil. We evaluated changes in epibiont distribution throughout the body regions of the host and among three different aquatic systems. We had predicted that certain body regions are more prone to support epibiont attachment, and that epibiont prevalence increases with increased host size and quality of the aquatic system. Three streams (Santana, São Pedro and DOuro), tributaries of the Guandu River, were sampled during 2010 and 2011. A total of 102 specimens of A. multispinis were collected and analyzed. Epibionts were found in fourteen of fifteen body regions of the host. Observation from scanning electron microscopy revealed that Chironomidae larvae fix themselves to the spicules through the anal prolegs, not at the skin, as previously reported. The amount of epibionts (degree of infestation) was significantly correlated with fish size in the Santana Stream (r = 0.6, p < 0.01), and São Pedro Stream (r = 0.56, p < 0.01), but not in the DOuro Stream, the most altered of the three. The pre sence of epibionts on the body of the fish is directly correlated with the availability of spicules on the fishs body, the largest numbers of infestations being found in structures associated with swimming (caudal and pectoral fins), since the swimming movement can create favorable conditions (e.g., suspension of organic particles, increasing oxygenation) for the epibiont.(AU)


Assuntos
Animais , Peixes-Gato , Chironomidae , Simbiose , Distribuição Animal , Floresta Úmida , Brasil
14.
Zoologia (Curitiba, Impr.) ; 35: 1-7, 2018. map, tab, graf, ilus
Artigo em Inglês | VETINDEX | ID: biblio-1504505

Resumo

Streams in urban areas are strongly impacted by the input of organic matter and metals, for instance copper (Cu) and zinc (Zn). These metals are essential for the aquatic biota, but when absorbed in excess they are toxic. In Chiro nomidae larvae, the deleterious effects of heavy metals can be ascertained by analyzing the morphological deformities of the larval mentum, a structure of the oral cavity. In this study, we evaluated I) the bioavailability of Cu and Zn in urban stream sediments and II) the relationship between Cu and Zn concentrations and the incidence of deformities in the mentum of Chironomus larvae. Chironomid flies were collected from four locations in two streams at an urban area in southern Brazil. They were identified and the incidence of deformities in the mentum was quantified. Sediment samples were collected at the same locations where larvae were collected, to quantify the bioavailable fractions of Cu and Zn. The concentrations of Cu in the sediment were similar between the collection sites. However, Zn concentrations varied among sites, being greater in the stretch directly influenced by the input of the organic waste. In total, 2,895 Chironomid larvae were collected. The incidence of deformities in the mentum was above 30% and was correlated with the concentrations of Cu (r = 0.68) and Zn (r = 0.87). This correlation indicates that the municipal waste that is thrown into the citys streams has influenced the occurrence of deformities.


Assuntos
Animais , Chironomidae/anatomia & histologia , Cobre/intoxicação , Monitoramento Ambiental , Zinco/intoxicação , Qualidade Ambiental , Área Urbana
15.
Zoologia (Curitiba) ; 35: 1-7, 2018. mapas, tab, graf, ilus
Artigo em Inglês | VETINDEX | ID: vti-18492

Resumo

Streams in urban areas are strongly impacted by the input of organic matter and metals, for instance copper (Cu) and zinc (Zn). These metals are essential for the aquatic biota, but when absorbed in excess they are toxic. In Chiro nomidae larvae, the deleterious effects of heavy metals can be ascertained by analyzing the morphological deformities of the larval mentum, a structure of the oral cavity. In this study, we evaluated I) the bioavailability of Cu and Zn in urban stream sediments and II) the relationship between Cu and Zn concentrations and the incidence of deformities in the mentum of Chironomus larvae. Chironomid flies were collected from four locations in two streams at an urban area in southern Brazil. They were identified and the incidence of deformities in the mentum was quantified. Sediment samples were collected at the same locations where larvae were collected, to quantify the bioavailable fractions of Cu and Zn. The concentrations of Cu in the sediment were similar between the collection sites. However, Zn concentrations varied among sites, being greater in the stretch directly influenced by the input of the organic waste. In total, 2,895 Chironomid larvae were collected. The incidence of deformities in the mentum was above 30% and was correlated with the concentrations of Cu (r = 0.68) and Zn (r = 0.87). This correlation indicates that the municipal waste that is thrown into the citys streams has influenced the occurrence of deformities.(AU)


Assuntos
Animais , Chironomidae/anatomia & histologia , Cobre/intoxicação , Zinco/intoxicação , Monitoramento Ambiental , Qualidade Ambiental , Área Urbana
16.
Iheringia. Sér. Zool. ; 107(Supl): 01-06, 2017. tab
Artigo em Português | VETINDEX | ID: vti-688239

Resumo

Family Chironomidae is widely distributed with approximately 4,147 species known to the World, but this value is already outdated; for to Brazil about 379 species are recorded. We present a current inventory of species of Chironomidae for the state of Mato Grosso do Sul. Up to now, 16 species are recorded to the state. These species belongs to the genera Aedokritus, Beardius, Chironomus, Corynoneura, Djalmabatista, Fissimentum, Goeldichironomus, Oukuriella and Xenochironomus. In addition, 83 morphospecies are known to 33 genus of Chinonominae, six of Orthocladiinae and ten of Tanypodinae, all from fauna surveys and ecological studies in the Upper Paraná River and its adjacent rivers.(AU)


A família Chironomidae é amplamente distribuída com aproximadamente 4.147 espécies conhecidas para o mundo, entretanto esse valor já está desatualizado; para o Brasil cerca de 379 espécies são registradas. Apresentamos um inventário atualizado das espécies de Chironomidae do estado do Mato Grosso do Sul. Até o momento, 16 espécies possuem registro assinalado para o estado. Estas pertencem aos gêneros Aedokritus, Beardius, Chironomus, Corynoneura, Djalmabatista, Fissimentum, Goeldichironomus, Oukuriella e Xenochironomus. Além destas, são conhecidas 83 morfoespécies, referentes a 33 gêneros de Chironominae, seis de Orthocladiinae e dez de Tanypodinae, todas provenientes de levantamentos faunísticos e estudos ecológicos no Alto Rio Paraná e seus rios adjacentes.(AU)


Assuntos
Animais , Chironomidae , Grupos de População Animal , Brasil , Larva
17.
Iheringia, Sér. zool ; 107(Supl): 01-06, 2017. tab
Artigo em Português | VETINDEX | ID: biblio-1483156

Resumo

Family Chironomidae is widely distributed with approximately 4,147 species known to the World, but this value is already outdated; for to Brazil about 379 species are recorded. We present a current inventory of species of Chironomidae for the state of Mato Grosso do Sul. Up to now, 16 species are recorded to the state. These species belongs to the genera Aedokritus, Beardius, Chironomus, Corynoneura, Djalmabatista, Fissimentum, Goeldichironomus, Oukuriella and Xenochironomus. In addition, 83 morphospecies are known to 33 genus of Chinonominae, six of Orthocladiinae and ten of Tanypodinae, all from fauna surveys and ecological studies in the Upper Paraná River and its adjacent rivers.


A família Chironomidae é amplamente distribuída com aproximadamente 4.147 espécies conhecidas para o mundo, entretanto esse valor já está desatualizado; para o Brasil cerca de 379 espécies são registradas. Apresentamos um inventário atualizado das espécies de Chironomidae do estado do Mato Grosso do Sul. Até o momento, 16 espécies possuem registro assinalado para o estado. Estas pertencem aos gêneros Aedokritus, Beardius, Chironomus, Corynoneura, Djalmabatista, Fissimentum, Goeldichironomus, Oukuriella e Xenochironomus. Além destas, são conhecidas 83 morfoespécies, referentes a 33 gêneros de Chironominae, seis de Orthocladiinae e dez de Tanypodinae, todas provenientes de levantamentos faunísticos e estudos ecológicos no Alto Rio Paraná e seus rios adjacentes.


Assuntos
Animais , Brasil , Chironomidae , Grupos de População Animal , Larva
18.
Iheringia. Sér. Zool. ; 107: 1-8, 2017. ilus, mapas, tab, graf
Artigo em Inglês | VETINDEX | ID: vti-16277

Resumo

Invasive macrophytes threaten freshwater ecosystem biodiversity. We analyzed the impact of the invasive white ginger lily (Hedychium coronarium J. Kõnig, Zingiberaceae) on aquatic insect assemblages living in the littoral zone of a tropical reservoir. We took aquatic insect samples in the littoral zone on four main vegetal profile banks: white ginger monotypic bank, forest partially invaded, native macrophyte monotypic bank and riparian forest. At each vegetal bank, we measured abiotic variables such as dissolved oxygen, pH, water temperature and depth. We analyzed the aquatic insects through abundance, richness and Simpson diversity. We used the non-Metric Multidimensional Scaling (nMDS) analysis to analyze the spatial distribution of each assemblage, and Analysis of similarities (ANOSIM) to verify differences amongst dissimilarity distances. Additionally, we analyzed the main taxa associated with invasive macrophytes through indicator species analyses using IndVal index. We observed that the invasive macrophyte banks presented higher abundance of associated specimens, as well as lower dissimilarity of aquatic insect assemblages. Additionally, invasive macrophytes shifted the water pH and littoral depth of reservoir banks. The IndVal index indicated eight aquatic insects as indicator species. Labrundinia unicolor Silva, 2013, Ablabesmyia depaulai Neubern, 2013 and Diastatops Rambur, 1842 were indicator species on banks. We concluded that invasion of white ginger lily caused loss of shallow littoral habitat and altered the pH of the surrounding water probably by high decomposition rate and high production of plant biomass. We suggest the use of species of aquatic insects as indicator species to monitor white ginger lily impact in freshwater systems.(AU)


Assuntos
Animais , Chironomidae , Zingiberaceae , Água Doce , Espécies Introduzidas , Macrófitas , Biodiversidade
19.
Iheringia, Sér. zool ; 107: 1-8, 2017. ilus, map, tab, graf
Artigo em Inglês | VETINDEX | ID: biblio-1483007

Resumo

Invasive macrophytes threaten freshwater ecosystem biodiversity. We analyzed the impact of the invasive white ginger lily (Hedychium coronarium J. Kõnig, Zingiberaceae) on aquatic insect assemblages living in the littoral zone of a tropical reservoir. We took aquatic insect samples in the littoral zone on four main vegetal profile banks: white ginger monotypic bank, forest partially invaded, native macrophyte monotypic bank and riparian forest. At each vegetal bank, we measured abiotic variables such as dissolved oxygen, pH, water temperature and depth. We analyzed the aquatic insects through abundance, richness and Simpson diversity. We used the non-Metric Multidimensional Scaling (nMDS) analysis to analyze the spatial distribution of each assemblage, and Analysis of similarities (ANOSIM) to verify differences amongst dissimilarity distances. Additionally, we analyzed the main taxa associated with invasive macrophytes through indicator species analyses using IndVal index. We observed that the invasive macrophyte banks presented higher abundance of associated specimens, as well as lower dissimilarity of aquatic insect assemblages. Additionally, invasive macrophytes shifted the water pH and littoral depth of reservoir banks. The IndVal index indicated eight aquatic insects as indicator species. Labrundinia unicolor Silva, 2013, Ablabesmyia depaulai Neubern, 2013 and Diastatops Rambur, 1842 were indicator species on banks. We concluded that invasion of white ginger lily caused loss of shallow littoral habitat and altered the pH of the surrounding water probably by high decomposition rate and high production of plant biomass. We suggest the use of species of aquatic insects as indicator species to monitor white ginger lily impact in freshwater systems.


Assuntos
Animais , Chironomidae , Espécies Introduzidas , Zingiberaceae , Água Doce , Biodiversidade , Macrófitas
20.
Braz. j. biol ; 76(2): 402-411, Apr.-June 2016. mapas, tab, graf
Artigo em Inglês | VETINDEX | ID: vti-25561

Resumo

Abstract We examined the effects of the Mogi-Guaçu river damming (São Paulo State, Brazil) on the Chironomidae fauna. Pre, during, and post-filling sampling was carried out in the main channel and margins of one site in the upper zone of the reservoir, using a modified Petersen grab (325 cm2). We evaluated the total, subfamily, and tribe densities and also their relative abundance. Analysis of genera included densities, relative abundance, richness, and dominance. The Rossos ecological value index (EVI) determined the ecological importance of each genus. There was a tendency of decrease of the total Chironomidae density, increase in the percentage of Chironomini, and decrease in densities and percentages of Orthocladiinae and Tanytarsini. These changes in percentage were respectively related to Polypedilum, Lopescladius, and Rheotanytarsus, the genera with the highest EVI values. After-filling richness was lower in the margins and dominance of genera did not change significantly. Chironomidae in the margins was more sensitive to damming than in the main channel. This difference in sensibility sustains the use of Chironomidae as bioindicators. Damming impact was indicated by the reduction of both genera richness in the margins and relative abundance of groups typical of faster waters. The results have highlighted the need for multi-habitat analysis combined with a before-after sampling approach in the environmental impact studies concerning the damming impact on the benthic fauna.(AU)


Resumo Este trabalho teve como objetivo avaliar o impacto do represamento do Rio Mogi-Guaçu, em um ponto situado na zona de remanso do reservatório, através da utilização da taxocenose Chironomidae. A amostragem foi realizada antes, durante e após o represamento, no canal e nas margens, com o auxílio de um pegador Petersen modificado (área de 325 cm2). Calculou-se a densidade total, de subfamílias, tribos e gêneros de Chironomidae, bem como sua abundância relativa. Estimou-se a riqueza e a dominância de gêneros. O índice de valor ecológico de Rosso (IVE) foi utilizado para avaliar a importância ecológica dos diferentes gêneros. Houve tendência de redução da densidade total de Chironomidae, aumento da abundância relativa de Chironomini e diminuição das abundâncias relativas de Orthocladiinae e Tanytarsini. Estas alterações de abundância relativa foram relacionadas respectivamente a Polypedilum, Lopescladius e Rheotanytarsus, gêneros que apresentaram os maiores valores de IVE. Após o represamento, houve decréscimo da riqueza de gêneros na margem, enquanto a dominância não apresentou alteração significativa. A taxocenose de Chironomidae das margens mostrou-se mais sensível ao represamento que a do canal. Esta diferença de sensibilidade confirma o potencial dos Chironomidae como bioindicadores. A ocorrência de impacto foi observada através da diminuição da riqueza de gêneros nas margens e da abundância relativa de táxons característicos de águas mais rápidas. Os resultados chamam atenção para a necessidade de utilizar a abordagem de múltiplos habitats combinada com a amostragem antes e depois do evento na avaliação dos impactos causados por represamento sobre a fauna bentônica.(AU)


Assuntos
Animais , Chironomidae , Reservatórios de Água , Biomarcadores Ambientais
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