Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 3 de 3
Filtrar
Mais filtros








Base de dados
Intervalo de ano de publicação
1.
Sci Rep ; 10(1): 18569, 2020 10 29.
Artigo em Inglês | MEDLINE | ID: mdl-33122760

RESUMO

Long-term monitoring of host-parasite interactions is important for understanding the consequences of infection on host fitness and population dynamics. In an eight-year survey of the loggerhead sea turtle (Caretta caretta) population nesting in Cabo Verde, we determined the spatiotemporal variation of Ozobranchus margoi, a sanguivorous leech best known as a vector for sea turtle fibropapilloma virus. We quantified O. margoi association with turtles' δ15N and δ13C stable isotopes to identify where infection occurs. We then measured the influence of infection on reproduction and offspring fitness. We found that parasite prevalence has increased from 10% of the population in 2010, to 33% in 2017. Stable isotope analysis of host skin samples suggests transmission occurs within the host's feeding grounds. Interestingly, we found a significant interaction between individual size and infection on the reproductive success of turtles. Specifically, small, infected females produced fewer offspring of poorer condition, while in contrast, large, infected turtles produced greater clutch sizes and larger offspring. We interpret this interaction as evidence, upon infection, for a size-dependent shift in reproductive strategy from bet hedging to terminal investment, altering population dynamics. This link between infection and reproduction underscores the importance of using long-term monitoring to quantify the impact of disease dynamics over time.


Assuntos
Doenças Parasitárias em Animais/fisiopatologia , Tartarugas/parasitologia , Animais , Ecologia , Feminino , Interações Hospedeiro-Parasita , Sanguessugas/crescimento & desenvolvimento , Sanguessugas/fisiologia , Sanguessugas/virologia , Dinâmica Populacional , Reprodução , Tartarugas/crescimento & desenvolvimento , Tartarugas/fisiologia
2.
Sci Rep ; 10(1): 18001, 2020 10 22.
Artigo em Inglês | MEDLINE | ID: mdl-33093463

RESUMO

Understanding the processes that underlie the current distribution of genetic diversity in endangered species is a goal of modern conservation biology. Specifically, the role of colonization and dispersal events throughout a species' evolutionary history often remains elusive. The loggerhead sea turtle (Caretta caretta) faces multiple conservation challenges due to its migratory nature and philopatric behaviour. Here, using 4207 mtDNA sequences, we analysed the colonisation patterns and distribution of genetic diversity within a major ocean basin (the Atlantic), a regional rookery (Cabo Verde Archipelago) and a local island (Island of Boa Vista, Cabo Verde). Data analysis using hypothesis-driven population genetic models suggests the colonization of the Atlantic has occurred in two distinct waves, each corresponding to a major mtDNA lineage. We propose the oldest lineage entered the basin via the isthmus of Panama and sequentially established aggregations in Brazil, Cabo Verde and in the area of USA and Mexico. The second lineage entered the Atlantic via the Cape of Good Hope, establishing colonies in the Mediterranean Sea, and from then on, re-colonized the already existing rookeries of the Atlantic. At the Cabo Verde level, we reveal an asymmetric gene flow maintaining links across island-specific nesting groups, despite significant genetic structure. This structure stems from female philopatric behaviours, which could further be detected by weak but significant differentiation amongst beaches separated by only a few kilometres on the island of Boa Vista. Exploring biogeographic processes at diverse geographic scales improves our understanding of the complex evolutionary history of highly migratory philopatric species. Unveiling the past facilitates the design of conservation programmes targeting the right management scale to maintain a species' evolutionary potential.


Assuntos
Evolução Biológica , DNA Mitocondrial/genética , Fluxo Gênico , Variação Genética , Genética Populacional , Mitocôndrias/genética , Tartarugas/genética , Animais , Brasil , Cabo Verde , DNA Mitocondrial/análise , Mar Mediterrâneo , México , Panamá , Estados Unidos
3.
J Gastrointest Surg ; 22(5): 925-927, 2018 05.
Artigo em Inglês | MEDLINE | ID: mdl-29159758

RESUMO

Left paraduodenal hernia is an entrapment of the small bowel into the Landzert fossa, an unusual congenital peritoneal defect behind the descending mesocolon that results from failure of part of the descending mesocolon to fuse with the posterior parietal peritoneum (Doishita et al. in Radiographics, 36(1): 88-106, 2016). This fossa is reported to be present in approximately 2% of autopsy bodies. The authors present a case of a left paraduodenal hernia in a young woman.


Assuntos
Duodenopatias/diagnóstico por imagem , Duodenopatias/cirurgia , Hérnia/diagnóstico por imagem , Herniorrafia , Mesocolo/anormalidades , Adolescente , Feminino , Humanos , Tomografia Computadorizada por Raios X
SELEÇÃO DE REFERÊNCIAS
DETALHE DA PESQUISA