6 documents found, page 1 of 1
Checklist of chelonians from the upper madeira river and the lower Madeira–Puru...
Keller, Claudia; Villamarín, Francisco; Bernhard, Rafael; Silva, Daniely Félix daWe present data on occurrence of chelonians for the Madeira River (southwestern Amazon, Brazil). Sampling was undertaken along the BR-319 Highway in the Madeira-Purus interfluvium and along a 125‑km stretch of the upper Madeira River. Findings were contrasted with a checklist of species expected to occur in the region according to current distribution maps, and with literature data for the Madeira subbasin. Out...
Conservation and management implications of nest-site selection of the sympatri...
Villamarín, Francisco; Marioni, Boris; Thorbjarnarson, John B.; Nelson, Bruce Walker; Botero-Arias, Robinson; Magnusson, William ErnestManagement of crocodilians is often based on source-sink dynamics, protecting breeding habitat and concentrating hunting in other areas. Nest distributions shed light on habitat use by breeding populations, which might be used as a basis for monitoring and management. The heterogeneous spatial distribution of Melanosuchus niger and Caiman crocodilus in Amazonia has been suggested to reflect past hunting pressur...
Predicting suitable nesting sites for the Black caiman (Melanosuchus niger Spix...
Banon, Gabriela Paola Ribeiro; Banon, Gerald; Villamarín, Francisco; Arraut, E. M.; Moulatlet, Gabriel M.; Rennó, Camilo Daleles; Banon, Lise ChristineAfter many years of illegal hunting and commercialization, the populations of the Black caiman (Melanosuchus niger) have been recovering during the last four decades due to the enforcement of a legislation that inhibits their international commercialization. Protecting nesting sites, in which vulnerable life forms (as reproductive females, eggs, and neonates) spend considerable time, is one of the most appropri...
Body size is more important than diet in determining stable-isotope estimates o...
Villamarín, Francisco; Jardine, Timothy D.; Bunn, Stuart; Marioni, Boris; Magnusson, William ErnestThe trophic position of a top predator, synonymous with food-chain length, is one of the most fundamental attributes of ecosystems. Stable isotope ratios of nitrogen (δ 15N) have been used to estimate trophic position of organisms due to the predictable enrichment of 15N in consumer tissues relative to their diet. Previous studies in crocodilians have found upward ontogenetic shifts in their 'trophic position'....
Temporal uncoupling between energy acquisition and allocation to reproduction i...
Villamarín, Francisco; Magnusson, William Ernest; Jardine, Timothy D.; Valdez, Dominic G.; Woods, Ryan J.; Bunn, StuartAlthough considerable knowledge has been gathered regarding the role of fish in cycling and translocation of nutrients across ecosystem boundaries, little information is available on how the energy obtained from different ecosystems is temporally allocated in fish bodies. Although in theory, limitations on energy budgets promote the existence of a trade-off between energy allocated to reproduction and somatic g...
Commitment, enjoyment and motivation in young soccer competitive players
Garcia-Mas, Alexandre; Palou, Pere; Gili, Margarita; Ponseti, Xavier; Borras, Pere A.; Vidal, Josep; Cruz, Jaume; Torregrosa, MiquelBuilding upon Deci’s and Ryan (1985) Self-determination theory as well as the sportive behavioral correlates of the model of Commitment (Scanlan et al., 1976), this study tries to establish the relationship between motivation and commitment in youth sport. For this purpose 454 young competitive soccer players answered the Sport Motivation Scale (SMS) and the Sport Commitment Questionnaire (SCQ) during the regul...