| distribution and abundance of four caiman species (crocodylia: alligatoridae) in jaú national park, amazonas, brazil. | jaú national park is a large rain forest reserve that contains small populations of four caiman species. we sampled crocodilian populations during 30 surveys over a period of four years in five study areas. we found the mean abundance of caiman species to be very low (1.0 +/- 0.5 caiman/km of shoreline), independent of habitat type (river, stream or lake) and season. while abundance was almost equal, the species' composition varied in different waterbody and study areas. we analysed the structur ... | 2001 | 12189791 |
| do crocodilians get the flu? looking for influenza a in captive crocodilians. | it is well established that several wild aquatic bird species serve as reservoirs for the influenza a virus. it has also been shown that the influenza a virus can be transmitted to mammalian species such as tigers and domestic cats and dogs through ingestion of infected birds. another group of animals that should also be considered as potential hosts for the influenza a virus are the crocodilians. many crocodilian species share aquatic environments with wild birds that are known to harbor influe ... | 2008 | 18381628 |
| oswaldofilaria medemi n. sp. (nematoda: filarioidea), from the smooth-fronted caiman, paleosuchus trigonatus from colombia. | a filarial worm, oswaldofilaria medemi n. sp., obtained from the thoracic wall of an adult colombian caiman, paleosuchus trigonatus (schneider, 1801) is described. the new filaria differs from all other species of the genus by the long oesophagus and by differences in size and shape of the spiculae in the male. microfilariae could not be found in the blood of six p. trigonatus. | 1981 | 7339716 |
| extended mitogenomic phylogenetic analyses yield new insight into crocodylian evolution and their survival of the cretaceous-tertiary boundary. | the mitochondrial genomes of the dwarf crocodile, osteolaemus tetraspis, and two species of dwarf caimans, the smooth-fronted caiman, paleosuchus trigonatus, and cuvier's dwarf caiman, paleosuchus palpebrosus, were sequenced and included in a mitogenomic phylogenetic study. the phylogenetic analyses, which included a total of ten crocodylian species, yielded strong support to a basal split between crocodylidae and alligatoridae. osteolaemus fell within the crocodylidae as the sister group to cro ... | 2007 | 17719245 |
| the effect of dam construction on the movement of dwarf caimans, paleosuchus trigonatus and paleosuchus palpebrosus, in brazilian amazonia. | run-of-the-river hydroelectric dams cause changes in seasonal inundation of the floodplains, and this may cause displacement of semi-aquatic vertebrates present before dam construction. this study evaluated the movement of crocodilians before and after the filling of the santo antônio hydroelectric reservoir on the madeira river in the brazilian amazon, which occurred in november 2011. we radio-tracked four adult male paleosuchus palpebrosus and four adult male paleosuchus trigonatus before and ... | 2017 | 29176830 |
| phylogenetic relationships of south american alligatorids and the caiman of madeira river. | we analyzed dna sequences of the mitochondrial cytochrome b gene (cyt b), the nuclear recombination activating gene 1 (rag1) and the myelocytomatosis oncogene (myc) to infer the phylogenetic relationship of caiman crocodilus and caiman yacare, and other south american alligatorid crocodilian species. phylogenetic relationships were robustly supported with paleosuchus sister to melanosuchus and caiman. phylogenetic relationships of c. crocodilus and c. yacare were unclear as these two species sha ... | 2008 | 18161801 |
| variation in crocodilian dorsal scute organization and geometry with a discussion of possible functional implications. | dermal ossifications, including osteoderms, are present in many vertebrates and are frequently interpreted as a defense against predators. nevertheless, osteoderms remain ubiquitous in adult crocodilians while being absent in hatchlings, even though adults rarely experience predation. in other biological systems, increased variation, particularly fluctuating asymmetry, have proven useful for identifying biological structures likely to have evolved under relaxed selection, which in turn may infor ... | 2018 | 29044619 |