ForAlexa, an online tool for the rapid development of artificial intelligence skills for the teaching of evolutionary biology using Amazon's Alexa.

Intelligent Personal Assistants (IPAs), such as Amazon's Alexa, are now widely used for an ample variety of tasks, ranging from personal management to education. These tools have shown considerable promise for student-educator interactions, especially at a distance, a potential that has come to the forefront during the ongoing COVID-19 pandemic. Even so, this potential is still underexploited, even in the current scenario. Alexa's apps are known as skills, which include all the different commands that Alexa is capable of executing. It is important to note, however, that the use of such technology is work-intensive and can be relatively complex. Given this, to facilitate the development of new skills in Alexa, we have developed an online tool that permits the creation of questions and answers, as well as honing the interaction between Alexa and the user. We have named this tool ForAlexa, which has two types of forms, Question-And-Answer (Q&A) and Random-Quote. Both these forms allow the user to build intents (an activity that is invoked by a spoken request from the user), but with slightly different functions. The Q&A form is used to compile answers that Alexa will offer in response to an utterance (question), while the Random-Quote extends the interaction between Alexa and the user, based on the questions asked in the first form. ForAlexa also has a help assistant, as well as a manual, which explains all the steps necessary for the design of an intent. This tool allows educators to develop apps quickly and easily for their classes and this type of app could be an alternative to be used for students with special needs, such as the visually-impaired. Supplementary Information: The online version contains supplementary material available at 10.1186/s12052-022-00169-z.

Temperature and exudativory as drivers of the marmoset (Callithrix spp.) daily activity period.

Primates are affected by fluctuations in ambient temperatures, mostly through thermoregulatory costs and changes in the availability of food. In the present study, we investigate whether the ambient temperature and proxies of food availability affect the activity period of marmosets (Callithrix spp.). We predicted that: (i) at colder sites, marmosets would spend more time at sleeping sites; (ii) midday resting bouts would be longer at hotter sites; (iii) the onset/cessation of activity and resting behavior at midday would be more closely related to temperature than food availability, and (iv) highly exudativorous groups would have higher total levels of resting. We compiled data on the onset and cessation of activity and the time spent resting at midday from seven marmoset studies from sites with a wide range of temperatures. We used generalized linear mixed models to verify the relationship between the dependent variables (lag between dawn and the onset of activities, lag between cessation of activities and dusk, and proportion of resting during midday) and the minimum and maximum temperatures at the respective study sites, together with proxies of food availability (exudativory rates, the amount of habitat available per individual, and net primary productivity) using each sample month as a sampling unit and the identity of the study as a categorical random factor. At colder sites and during colder months, the marmosets left sleeping trees later in the morning and ceased their activities earlier, while at hotter sites and during hotter months, they spent more time resting during midday. More exudativorous groups become active later in the morning, but also ceased their activities later. The abundance of food did not affect the timing of activities. We provide evidence that both low and high temperatures affect marmosets' activities, and that their activity period appears to be more influenced by the thermal environment than food availability.

Anointing with commercial insect repellent by free-ranging Cebus capucinus in Manuel Antonio National Park, Quepos, Costa Rica.

Fur rubbing or anointing is a well known behavior in capuchin monkeys (Cebus and Sapajus), and may have medicinal and/or social functions. Observations of anointing in capuchins have recorded the application of substances derived from both plants (orange, onion, garlic, citronella, and lemongrass) and animals (ants and millipedes). The present study reports on anointing behavior in free-ranging white-headed capuchins, Cebus capucinus, which involved a commercial insect repellent. After looting a bottle of repellent from the bag of a visitor to the Manuel Antonio National Park in Costa Rica, an adult male bit open the bottle and rubbed the leaking liquid over its entire body, focusing mainly on its belly. Other members of the group rubbed themselves against the male's body and were eventually able to retrieve the bottle of repellent and anoint themselves. The repellent is composed mainly of extracts of eucalyptus and citronella. The capuchins may have been attracted by the strong citric scent of the citronella, which is known to stimulate fur-rubbing behavior in these monkeys. This is reinforced by the fact that the sequence of events was quite distinct from that associated with an earlier event, in which a juvenile male looted, tasted, and then discarded a stick of lip gloss and a tube of sunblock. Overall, the observations indicate that the citric scent of the repellent was attractive to the capuchins, especially in comparison with other man-made substances. As the animals partially ingested all the substances, there is clearly a need for more effective regulation of the contact between animals and visitors in the park.

Phylogenetic relationships among Capuchin (Cebidae, Platyrrhini) lineages: An old event of sympatry explains the current distribution of Cebus and Sapajus.

Capuchin monkeys are currently represented by four species of Cebus and eight of Sapajus. This group is taxonomically complex and several questions still need to be clarified. In the current study, using mtDNA markers and a larger sample representation than in previous studies, we seek to understand the phylogenetic relationships among the capuchin lineages and their historical biogeography. All 12 species of capuchins were analyzed for the mitochondrial Control Region and Cytochrome b to test two biogeographical hypotheses: "Reinvasion of the Amazon (ROA)" and "Sympatric Evolution (SEV)". The phylogenetic relationships among distinct lineages within genera is consistent with an evolutionary diversification pattern probably resulting from an explosive process of diversification and dispersal between 2.0 Ma and 3.0 Ma. Also, the analyses show that the ancestral capuchins were distributed in a wide area encompassing the Amazon and Atlantic Forest. Our results support the SEV hypothesis, showing that the current syntopic distribution of Cebus and Sapajus can be explained by a sympatric speciation event in the Amazon. We also indicate that the recently proposed species taxonomy of Cebus is not supported, and that S. cay and S. macrocephalus are a junior synonym of S. apella.

A primate at risk in Northeast Brazil: local extinctions of Coimbra Filho's titi (Callicebus coimbrai).

Identifying the factors that determine local extinction of populations is crucial to ensure species conservation. Forest-dwelling primates are especially vulnerable to habitat fragmentation, although few studies have provided systematic evidence of local extinctions. Over an 11-year period, approximately 100 remnant populations of the endangered Coimbra Filho's titi monkey (Callicebus coimbrai) have been found within the geographic range of the species in Bahia and Sergipe, Northeast Brazil. During the present study, extinction of 13 of these populations was recorded through intensive surveys. These extinctions were detected from evidence of intensive logging and clear-cutting, interviews with local residents and systematic searches of the sites where occurrence of the species had been confirmed in previous surveys. These local extinctions represent approximately 10 % of the known populations of C. coimbrai and up to 28.3 % of the area occupied by the species. Comparison of the vegetation structure in fragments where extinction was recorded and where the species still occurs indicated that sparser understorey may be a correlate of extinction, combined with the fact that extinctions occurred within fragments characterised by relatively high levels of anthropogenic disturbance. These findings reinforce the Endangered status of the species and the urgent need for intensification of conservation measures within the most impacted areas of the geographic distribution of C. coimbrai.

Functional planning units for the management of an endangered Brazilian titi monkey.

Conservation practices in the tropics often rely on the data available for a few, better-known species and the adoption of an appropriate spatial scale. By defining a set of landscape units that account for critical aspects of the focal species, the information available on these conservation targets can support regional conservation policies. Here, we define and classify adjacent landscapes, termed planning units, to orientate management decisions within and among these landscapes, which are occupied by an endangered flagship primate species (Coimbra-Filho's titi monkey, Callicebus coimbrai) from eastern Brazil. We use landscape boundaries (highways and river systems), and a high-resolution map of forest remnants to identify continuous and manageable landscapes. We employed functional landscape metrics based on the species' dispersal ability and home range size to characterize and classify these landscapes. We classified planning units by scoring them according to a suite of selected metrics through a Principal Component Analysis. We propose 31 planning units, containing one to six C. coimbrai populations, most with low values of habitat availability, functional connectivity and carrying capacity, and a high degree of degradation. Due to this poor landscape configuration, basic management practices are recommendable. However, additional aspects of the landscapes and the populations they contain (e.g., matrix type and genetic variability) should improve the scheme, which will require a closer integration of research aims with socio-political strategies. Even so, our scheme should prove useful for the combination of information on conservation targets (i.e., focal species) with management strategies on an administrative scale.

Resource Partitioning between Two Piranhas (Serrasalmus gibbus and Serrasalmus rhombeus) in an Amazonian Reservoir.

The exploitation of resources by closely related species with similar niches may be mediated by differences in activity patterns, which may vary in nycthemeral scale and seasonal scale. Piranhas Serrasalmus gibbus and Serrasalmus rhombeus are Neotropical predators that occur sympatrically in many environments of the Amazon basin. To evaluate the strategies adopted by these two species in a restricted environment (a reservoir), nycthemeral and seasonal samples were made, identifying the composition of the diet and their activity patterns. A total of 402 specimens were collected: 341 S. gibbus and 61 S. rhombeus. Both species fed themselves primarily on fish, with some seasonal variation being found in S. gibbus during the flood season, when plant material was consumed. There was considerable temporal overlap in the foraging behavior of the two species, although S. rhombeus presented a bimodal pattern of abundance over the 24-hour cycle. S. rhombeus was more active during the nighttime, between dusk and early morning, whereas S. gibbus was active throughout the nycthemeral cycle. These findings indicate low levels of competition between the two species, which allowed for a considerable overlap in nighttime foraging, following distinct nycthemeral patterns of foraging activity and allowing their coexistence.

Bat (mammalia: chiroptera) diversity in an area of mangrove forest in southern pernambuco, brazil, with a new species record and notes on ectoparasites (diptera: streblidae)

ABSTRACT This study reports the occurrence of bat species and their ectoparasites to a mangrove area of the State of Pernambuco. The bats were captured for seven consecutive months in four mangrove areas. Sampling occurred for 12 consecutive hours each night collection where mist-nets were used. Eighty-three bats of 14 species were captured. Of these, only 53 Phyllostomidae family bats found themselves parasited. We identified seven species of flies of the family Streblidae parasitizing bats. The diversity of bats is H = 2.19 for all areas sampled and the prevalence of streblid ranged from 8.3 to 66,6. The mean intensity ranged from one and five. It is reported for the first time the occurrence of Lophostoma brasiliense to the mangrove ecosystem, besides two species of streblid to Pernambuco.

RESUMO O presente artigo reporta a ocorrência de espécies de morcegos e seus ectoparasitos associados em uma área de manguezal do Estado de Pernambuco. Os morcegos foram capturados por sete meses consecutivos em quatro áreas. As capturas ocorreram por 12 horas em cada noite com auxílio de redes de neblinas. Foram capturados 83 espécimes de morcegos de 14 espécies. Destes, 53 indivíduos da família Phyllostomidae estavam parasitados. Nós identificamos sete espécies de moscas da família Streblidae parasitando morcegos. A diversidade de morcegos foi H = 2.19 para todas as áreas amostradas e a prevalência de estrebídeos variou de 8.3 a 66.6. A intensidade média variou de um a cinco ectoparasitos. É reportada pela primeira vez a ocorrência de Lophostoma brasiliense para o ecossistema manguezal, além de duas espécies de estrebídeos para Pernambuco.

Restoration Effects of the Riparian Forest on the Intertidal Fish Fauna in an Urban Area of the Amazon River.

Urbanization causes environmental impacts that threaten the health of aquatic communities and alter their recovery patterns. In this study, we evaluated the diversity of intertidal fish in six areas affected by urbanization (areas with native vegetation, deforested areas, and areas in process of restoration of vegetation) along an urban waterfront in the Amazon River. 20 species were identified, representing 17 genera, 14 families, and 8 orders. The different degrees of habitat degradation had a major effect on the composition of the fish fauna; the two least affected sectors were the only ones in that all 20 species were found. Eight species were recorded in the most degraded areas. The analysis revealed two well-defined groups, coinciding with the sectors in better ecological quality and degraded areas, respectively. The native vegetation has been identified as the crucial factor to the recovery and homeostasis of the studied ecosystem, justifying its legal protection and its use in the restoration and conservation of altered and threatened environments. These results reinforce the importance of maintaining the native vegetation as well as its restoration in order to benefit of the fish populations in intertidal zones impacted by alterations resulting from inadequate urbanization.

Evaluating the diversity of Neotropical anurans using DNA barcodes.

This study tested the effectiveness of COI barcodes for the discrimination of anuran species from the Amazon basin and other Neotropical regions. Barcodes were determined for a total of 59 species, with a further 58 species being included from GenBank. In most cases, distinguishing species using the barcodes was straightforward. Each species had a distinct COI barcode or codes, with intraspecific distances ranging from 0% to 9.9%. However, relatively high intraspecific divergence (11.4-19.4%) was observed in some species, such as Ranitomeya ventrimaculata, Craugastor fitzingeri, Hypsiboas leptolineatus, Scinax fuscomarginatus and Leptodactylus knudseni, which may reflect errors of identification or the presence of a species complex. Intraspecific distances recorded in species for which samples were obtained from GenBank (Engystomops pustulosus, Atelopus varius, Craugastor podiciferus, and Dendropsophus labialis) were greater than those between many pairs of species. Interspecific distances ranged between 11-39%. Overall, the clear differences observed between most intra- and inter-specific distances indicate that the COI barcode is an effective tool for the identification of Neotropical species in most of the cases analyzed in the present study.

Climate and land use changes will degrade the configuration of the landscape for titi monkeys in eastern Brazil.

Land use changes have profound effects on populations of Neotropical primates, and ongoing climate change is expected to aggravate this scenario. The titi monkeys from eastern Brazil (Callicebus personatus group) have been particularly affected by this process, with four of the five species now allocated to threatened conservation status categories. Here, we estimate the changes in the distribution of these titi monkeys caused by changes in both climate and land use. We also use demographic-based, functional landscape metrics to assess the magnitude of the change in landscape conditions for the distribution predicted for each species. We built species distribution models (SDMs) based on maximum entropy for current and future conditions (2070), allowing for different global circulation models and contrasting scenarios of glasshouse gas concentrations. We refined the SDMs using a high-resolution map of habitat remnants. We then calculated habitat availability and connectivity based on home-range size and the dispersal limitations of the individual, in the context of a predicted loss of 10% of forest cover in the future. The landscape configuration is predicted to be degraded for all species, regardless of the climatic settings. This include reductions in the total cover of forest remnants, patch size and functional connectivity. As the landscape configuration should deteriorate severely in the future for all species, the prevention of further loss of populations will only be achieved through habitat restoration and reconnection to counteract the negative effects for these and several other co-occurring species.

BAT (MAMMALIA: CHIROPTERA) DIVERSITY IN AN AREA OF MANGROVE FOREST IN SOUTHERN PERNAMBUCO, BRAZIL, WITH A NEW SPECIES RECORD AND NOTES ON ECTOPARASITES (DIPTERA: STREBLIDAE)

ABSTRACT This study reports the occurrence of bat species and their ectoparasites to a mangrove area of the State of Pernambuco. The bats were captured for seven consecutive months in four mangrove areas. Sampling occurred for 12 consecutive hours each night collection where mist-nets were used. Eighty-three bats of 14 species were captured. Of these, only 53 Phyllostomidae family bats found themselves parasited. We identified seven species of flies of the family Streblidae parasitizing bats. The diversity of bats is H = 2.19 for all areas sampled and the prevalence of streblid ranged from 8.3 to 66,6. The mean intensity ranged from one and five. It is reported for the first time the occurrence of Lophostoma brasiliense to the mangrove ecosystem, besides two species of streblid to Pernambuco.

RESUMO O presente artigo reporta a ocorrência de espécies de morcegos e seus ectoparasitos associados em uma área de manguezal do Estado de Pernambuco. Os morcegos foram capturados por sete meses consecutivos em quatro áreas. As capturas ocorreram por 12 horas em cada noite com auxílio de redes de neblinas. Foram capturados 83 espécimes de morcegos de 14 espécies. Destes, 53 indivíduos da família Phyllostomidae estavam parasitados. Nós identificamos sete espécies de moscas da família Streblidae parasitando morcegos. A diversidade de morcegos foi H = 2.19 para todas as áreas amostradas e a prevalência de estrebídeos variou de 8.3 a 66.6. A intensidade média variou de um a cinco ectoparasitos. É reportada pela primeira vez a ocorrência de Lophostoma brasiliense para o ecossistema manguezal, além de duas espécies de estrebídeos para Pernambuco.

Distribution of tolypeutes illiger, 1811 (xenarthra: cingulata) with comments on its biogeography and conservation.

This study reviews the data available on the distribution of three-banded armadillos of the genus Tolypeutes, identifying potential geographic barriers and evaluating possible biogeographic processes that may account for the present-day distribution of the species and its conservation status. The database was derived from published records, interviews, and voucher specimens, over a timescale ranging from the fossil record to specimens collected in 2013. A total of 236 localities were recorded, with 68 attributed to Tolypeutes matacus and 168 to Tolypeutes tricinctus. The vegetation within the range of the genus is predominantly a xerophytic mosaic of grassland, savannas, open woodland, and xeric thorn forest. The marine transgressions of the Miocene and the uplifting of the Brazilian Shield may have contributed to the vicariant separation of the ancestral populations of T. matacus, to the west and south, and T. tricinctus, to the north and east. The three-banded armadillo is possibly one of the most threatened of Brazilian mammals, considering the low number of recent records and the fact that it is hunted intensively throughout its range.

Dense understory and absence of capuchin monkeys (Sapajus xanthosternos) predict higher density of common marmosets (Callithrix jacchus) in the Brazilian Northeast.

Understanding the effects of habitat structure and other environmental variables on the density of a species can help define its habitat preferences and key ecological determinants of population parameters. The present study evaluated the effects of fragment size, the presence of a key predator/competitor, the yellow-breasted capuchin (Sapajus xanthosternos), primary productivity, the abundance of bromeliads, and habitat structure on the population density of the common marmoset (Callithrix jacchus). A total of 21 fragments were surveyed within a 350-km long zone of coastal Atlantic Forest representing the southern extreme of the distribution of the species in the Brazilian Northeast. An index of marmoset density was generated for each site based on playback surveys. The relationship between the density of marmosets and a set of parameters was evaluated by multiple regression. A Principal Components Analysis (PCA) condensed the five variables of habitat structure into two principal components, which contained 85% of their combined variation. The model that best explained the density of marmosets (R(2) = 59.1) contained the second PCA component and the presence/absence of capuchins. The analysis indicated that the marmosets prefer forests with denser understory, whether or not they are secondary habitats. The negative effect of the presence of capuchins may be related to predation pressure. The results of this study indicate that multiple-site studies may provide important insights into the habitat preferences of primate species and the factors that affect their population density.

How do we identify micronycteris (schizonycetris) Sanborni simmons, 1996 (Chiroptera, Phyllostomidae) reliably and where we can find this species in Brazil?

Micronycteris is divided into four subgenera, Micronycteris, Leuconycteris, Xenoctenes, and Schizonycteris. The latter includes Micronycteris (Schizonycteris) minuta, Micronycteris (S.) schmidtorum, Micronycteris (S.) sanborni and Micronycteris (S.) yatesi. Little is known of the biology of M. (S.) sanborni, which is widely distributed in the dry forests of South America, but is known from only few sites. The scarcity of records of M. sanborni appears to be at least partly related to the difficulty of differentiating this species from the other members of the subgenus Schizonycteris. The present study identifies the key traits that distinguish this species from other Schizonycteris, reviews the geographic distribution of the species, and presents some notes on breeding patterns. Six new localities are presented for M. sanborni, and are analyzed together with those available in the literature, providing new insights into ecological and zoogeographic patterns. A number of the diagnostic features established by Simmons (1996) in the description of M. sanborni proved to have little taxonomic value, especially for the differentiation of M. minuta and M. yatesi, which it closely resembles. The primary external difference is the pure white color of the ventral pelage and the proportion of the white base (2/3-4/5) of the dorsal hair in M. sanborni, in contrast with dirty white or pale gray and a much shorter white base of the dorsal hair in the other species. A number of cranial traits are also important. The distributional data now indicate that M. sanborni occurs mainly in mesic and open areas, including disturbed habitats, in the Caatinga scrublands and the Cerrado savannas of northeastern Brazil, especially in areas with rocky outcrops. Micronycteris sanborni appears to be monoestrous, with births coinciding with the rainy season.

Micronycteris está dividido em quatro subgêneros, Micronycteris, Leuconycteris, Xenoctenes e Schizonycteris. Este último inclui Micronycteris (Schizonycteris) minuta, Micronycteris (S.) schmidtorum, Micronycteris (S.) sanborni e Micronycteris (S.) yatesi. Atualmente pouco se sabe sobre a biologia de M. (S.) sanborni, a qual é amplamente distribuída pelas florestas secas da América do Sul, apesar de ser conhecida de apenas poucas localidades. A escassez de registros de M. sanborni parece está parcialmente relacionado a dificuldade de diferenciar esta espécie de outros membros do subgênero Schizonycteris. Dessa forma, o presente estudo visa identificar as características diagnósticas que distingue esta espécie dos outros Schizonycteris, revisar a distribuição geográfica dessa espécie e apresentar comentários sobre o seu padrão reprodutivo. Seis novas localidades são apresentadas aqui para M. sanborni e, juntas com as outras disponíveis na literatura, foram analisadas fornecendo novas abordagens sobre o padrão ecológico e zoogeográfico dessa espécie. Várias características diagnósticas estabelecidas por Simmones (1996) na descrição de M. sanborni mostraram-se de pouco valor taxonômico, especialmente para a diferenciação entre M. minuta e M. yatesi, das quais mais se assemelha. Os dados de distribuição levantados indicam que M. sanborni ocorre principalmente em áreas mésicas e abertas, incluindo ambientes alterados, na Caatinga arbustiva e nas savanas do Cerrado do nordeste do Brasil, especialmente em áreas com afloramentos rochosos. Micronycteris sanborni parece ser monoéstrico, com os nascimentos coincidindo com a estação chuvosa.

How do we identify micronycteris (schizonycetris) Sanborni simmons, 1996 (Chiroptera, Phyllostomidae) reliably and where we can find this species in Brazil?

Micronycteris is divided into four subgenera, Micronycteris, Leuconycteris, Xenoctenes, and Schizonycteris. The latter includes Micronycteris (Schizonycteris) minuta, Micronycteris (S.) schmidtorum, Micronycteris (S.) sanborni and Micronycteris (S.) yatesi. Little is known of the biology of M. (S.) sanborni, which is widely distributed in the dry forests of South America, but is known from only few sites. The scarcity of records of M. sanborni appears to be at least partly related to the difficulty of differentiating this species from the other members of the subgenus Schizonycteris. The present study identifies the key traits that distinguish this species from other Schizonycteris, reviews the geographic distribution of the species, and presents some notes on breeding patterns. Six new localities are presented for M. sanborni, and are analyzed together with those available in the literature, providing new insights into ecological and zoogeographic patterns. A number of the diagnostic features established by Simmons (1996) in the description of M. sanborni proved to have little taxonomic value, especially for the differentiation of M. minuta and M. yatesi, which it closely resembles. The primary external difference is the pure white color of the ventral pelage and the proportion of the white base (2/3-4/5) of the dorsal hair in M. sanborni, in contrast with dirty white or pale gray and a much shorter white base of the dorsal hair in the other species. A number of cranial traits are also important. The distributional data now indicate that M. sanborni occurs mainly in mesic and open areas, including disturbed habitats, in the Caatinga scrublands and the Cerrado savannas of northeastern Brazil, especially in areas with rocky outcrops. Micronycteris sanborni appears to be monoestrous, with births coinciding with the rainy season.(AU)

Micronycteris está dividido em quatro subgêneros, Micronycteris, Leuconycteris, Xenoctenes e Schizonycteris. Este último inclui Micronycteris (Schizonycteris) minuta, Micronycteris (S.) schmidtorum, Micronycteris (S.) sanborni e Micronycteris (S.) yatesi. Atualmente pouco se sabe sobre a biologia de M. (S.) sanborni, a qual é amplamente distribuída pelas florestas secas da América do Sul, apesar de ser conhecida de apenas poucas localidades. A escassez de registros de M. sanborni parece está parcialmente relacionado a dificuldade de diferenciar esta espécie de outros membros do subgênero Schizonycteris. Dessa forma, o presente estudo visa identificar as características diagnósticas que distingue esta espécie dos outros Schizonycteris, revisar a distribuição geográfica dessa espécie e apresentar comentários sobre o seu padrão reprodutivo. Seis novas localidades são apresentadas aqui para M. sanborni e, juntas com as outras disponíveis na literatura, foram analisadas fornecendo novas abordagens sobre o padrão ecológico e zoogeográfico dessa espécie. Várias características diagnósticas estabelecidas por Simmones (1996) na descrição de M. sanborni mostraram-se de pouco valor taxonômico, especialmente para a diferenciação entre M. minuta e M. yatesi, das quais mais se assemelha. Os dados de distribuição levantados indicam que M. sanborni ocorre principalmente em áreas mésicas e abertas, incluindo ambientes alterados, na Caatinga arbustiva e nas savanas do Cerrado do nordeste do Brasil, especialmente em áreas com afloramentos rochosos. Micronycteris sanborni parece ser monoéstrico, com os nascimentos coincidindo com a estação chuvosa.(AU)

Reconsidering the taxonomy of the Black-Faced Uacaris, Cacajao melanocephalus group (Mammalia: Pitheciidae), from the northern Amazon Basin.

The black-faced uacaris are a poorly known group of platyrrhine monkeys from the Rio Negro basin in northwestern Amazonia. Originally described as two distinct species-Cacajao melanocephalus (Humboldt 1812) and Cacajao ouakary (Spix 1823)-from opposite banks of the Negro, they were treated as a single species until the end of the twentieth century, when molecular studies reconfirmed their status as true species. One of these studies not only nominated a third (northern) species, Cacajao ayresi Boubli et al. 2008, but also identified C. ouakary as a junior synonym of C. melanocephalus, resulting in the introduction of a new nomen, Cacajao hosomi Boubli et al. 2008. In the present study, additional evidence on morphological and zoogeographic variables is analyzed, which indicates that C. ouakary should be reinstated, and supports the nomination of a neotype of C. melanocephalus. The molecular and zoogeographic data on the species status of the ayresi form are also re-assessed, leading to the conclusion that, on the basis of the evidence available at the present time, this form should be considered a subspecies of C. melanocephalus. A new taxonomic arrangement is proposed, which recognizes two species, C. ouakary and C. melanocephalus, the latter with two subspecies, C. m. melanocephalus and C. m. ayresi.

Forest structure drives global diversity of primates.

Geographic gradients in the species richness of non-human primates have traditionally been attributed to the variation in forest productivity (related to precipitation levels), although an all-inclusive, global-scale analysis has never been conducted. We perform a more comprehensive test on the role of precipitation and biomass production and propose an alternative hypothesis - the variation in vertical structure of forest habitats as measured by forest canopy height - in determining primate species richness on a global scale. Considering the potential causal relationships among precipitation, productivity and forest structure, we arranged these variables within a path framework to assess their direct and indirect associations with the pattern of primate species richness using structural equation modelling. The analysis also accounted for the influence of spatial autocorrelation in the relationships and assessed possible historical differences among biogeographical regions. The path coefficients indicate that forest canopy height (used as a proxy for vertical forest structure) is a better predictor of primate species richness than either precipitation or productivity on both global and continental scales. The only exception was Asia, where precipitation prevailed, albeit independently from productivity or forest structure. The influence of spatially structured processes varied markedly among biogeographical regions. Our results challenge the traditional rainfall-based viewpoint in favour of forest distribution and structure as primary drivers of primate species richness, which aggregate potential effects from both climatic factors and habitat complexity. These findings may support predictions of the impact of forest removal on primate species richness.

Seasonal variation in the length of the daily activity period in buffy-headed marmosets (Callithrix flaviceps): an important consideration for the analysis of foraging strategies in observational field studies of primates.

Activity budgets are widely used in primate behavioral studies for the analysis of ecological strategies. In some cases, there is considerable seasonal variation in the length of the daily activity period. Here, activity budgets from two field studies of Callithrix flaviceps were compiled first by the traditional approach (proportion of scan sample records) and then by considering the proportion of time dedicated to each activity over the 24-hr cycle (adjusted budget). Both groups were almost invariably active for at least 1-2 hr less than the daylight period, with significantly shorter activity periods during the austral winter, when the daylight period was up to 2:35 hr shorter than in the summer. The adjustment of activity budgets provided a completely different perspective on foraging strategies. Whereas the basic budgets indicated a significant increase in foraging and moving during the resource-poor dry season (winter) months, the time-adjusted data revealed that the primary strategy was a time-minimizing one, with the animals simply spending more time at rest during the longer activity periods of summer days. While both groups followed the same pattern of relatively short activity periods, there were considerable differences between sites in the mean duration of the period in a given month, and in behavior patterns, although the analysis of the determining factors was beyond the scope of the present study. Overall, the results of the study indicate that the manipulation of the duration of the daily activity period may be an integral component of primate behavioral strategies, and that this parameter should be taken into account systematically when evaluating activity patterns, especially at sites at relatively high latitudes where day length may vary considerably over the course of the year.

Activity budget, diet, and use of space by two groups of squirrel monkeys (Saimiri sciureus) in eastern Amazonia.

Squirrel monkeys (Saimiri spp.) are widely distributed in the Amazon basin. This study describes the ecological and behavioral patterns of two social groups of S. sciureus in forests adjacent to the Tucuruí hydroelectric reservoir in eastern Amazonia, including range size, activity budgets, and composition of the diet. The groups were monitored at Base 4 (group B4) and Germoplasma Island (group GI). Quantitative behavioral data were collected using instantaneous scan sampling to record behavior, substrate use, and height. Home ranges were delimited using a GPS to determine group position after each 50 m of movement. Home ranges were 75.0 ha for group B4 (39 members) and 77.5 ha for group GI (32 members). The use of vertical strata was well defined, with a marked preference for the middle and lower levels of the canopy. The activity budgets of both groups were typical of those of other squirrel monkeys and were dominated by foraging (B4 = 48.7 %; GI = 49.6 %), moving (both groups 28.9 %), and feeding (B4 = 14.6 %; GI = 12.4 %). Resting was rare (B4 = 3.5 %; GI = 2.6 %) and less common than social behavior (B4 = 4.3 %; GI = 6.4 %). The diet of both groups was dominated by plant material (B4 = 70.7 % of feeding records; GI = 71.4 %), which is in contrast with the more insectivorous diets recorded for Saimiri at other sites. Group GI spent more time foraging during the dry season, whereas group B4 spent more time in the rainy season when the consumption of fruit increased (significantly, in the case of group GI). The less insectivorous diet of these groups may be due to a number of factors, including the unique habitat configuration at the site and reduced hydrological stress due to the proximity of the reservoir.