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11 results for “Paleosuchus”
Figure 2. After 21 in Predation on eggs of Schneider's dwarf caiman, Paleosuchus trigonatus (Schneider, 1807), by armadillos and other predators
Figure 2. After 21 days, (A) a giant armadillo returns to the same nest and is driven away by an adult Paleosuchus trigonatus. After (B) remaining face to face with the caiman, (C, D) the armadillo departs, circling the nest tree.
Figure 1 in Temperature variation in nests of Paleosuchus palpebrosus (Crocodylia: Alligatoridae) near the southern edge of the species´ range, Brazil
Figure 1. Egg-chamber temperature (upper filled circles), air temperature in the shade near the nest (triangle), and rainfall (lower filled circles). Nest 1 was from the ESSA in 2008; Nest 2 from the Serra do Urucum in 2010; Nest 3 from the Serra do Urucum in 2010; and Nest 4 from the Serra do Urucum in 2011.
Figure 2 in Temperature variation in nests of Paleosuchus palpebrosus (Crocodylia: Alligatoridae) near the southern edge of the species´ range, Brazil
Figure 2. Egg-chamber temperatures for three nests in the Serra do Urucum, in 2010, 2012, and 2013.
Architecture of the bronchial tree in Cuvier's dwarf caiman (Paleosuchus palpebrosus)
<p>We imaged the lungs of five Cuvier's dwarf caiman (<em>Paleosuchus palpebrosus</em>) via computed tomography (CT) and micro-computed tomography (μCT) and compared these data to the lungs of the American alligator (<em>Alligator mississippiensis</em>). These data demonstrate anatomical commonalities between the lungs of <em>P. palpebrosus</em> and <em>A. mississippiensis</em>, and a few notable differences. The structural similarities are (a) a proximally narrow, distally widened, hook-shaped primary bronchus; (b) a cervical ventral bronchus that branches of the primary bronchus and immediately makes a hairpin turn toward the apex of the lung; (c) a sequential series of dorsobronchi arising from the primary bronchus caudal to the cervical ventral bronchus; (d) intraspecifically highly variable medial sequence of secondary airways; (e) sac-like laterobronchi; and (f ) grossly dead-ended caudal group bronchi in the caudal and ventral aspects of the lung. The primary differences between the two taxa are in the overall number of large bronchi (fewer in <em>P. palpebrosus</em>), and the number of branches that contribute to the cardiac regions. Imaging data of both a live and deceased specimen under varying states (postprandial, fasting, total lung capacity, open to atmosphere) indicate that the caudal margin and position of the lungs shift craniocaudally relative to the vertebral column. These imaging data suggest that the smooth thoracic ceiling may be correlated to visceral movement during ventilation, but this hypothesis warrants validation. These results provide the scaffolding for future comparisons between crocodilians, for generating preliminary reconstructions of the ancestral crocodilian bronchial tree, and establishing new hypotheses of bronchial homology across Archosauria.</p>
Figure 1 in Parental care in the dwarf caiman, Paleosuchus palpebrosus Cuvier, 1807 (Reptilia: Crocodilia: Alligatoridae)
Figure 1. Locations of survey in three sites, around the Pantanal (1), in the Guaporé-Madeira (2) and Amazon Rivers (3), Brazil.
Figure 2 in Parental care in the dwarf caiman, Paleosuchus palpebrosus Cuvier, 1807 (Reptilia: Crocodilia: Alligatoridae)
Figure 2. Number of hatchlings of Paleosuchus palpebrosus counted in sites around the Pantanal, in the Guaporé-Madeira and Amazon Rivers between 2005 and 2011. Groups accompanied by an adult are indicated by triangles, and those for which an accompanying adult was not detected are shown by circular symbols.
Architecture of the bronchial tree in Cuvier’s dwarf caiman (Paleosuchus palpebrosus)
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Figure 3 in Predation on eggs of Schneider's dwarf caiman, Paleosuchus trigonatus (Schneider, 1807), by armadillos and other predators
Figure 3. (A, B) Adult Paleosuchus trigonatus defends a nest against a nine-banded armadillo, Dasypus novemcinctus, which (C, D) leaves, then returns by going around the nest tree.
Figure 1 in Predation on eggs of Schneider's dwarf caiman, Paleosuchus trigonatus (Schneider, 1807), by armadillos and other predators
Figure 1. (A) Giant armadillo eats eggs, (B, C) female Paleosuchus trigonatus defends the nest and (D) the giant armadillo returns to the nest after retreating behind the tree.
Data from: 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 after the formation of the reservoir between 2011 and 2013. The home ranges of the P. palpebrosus varied from < 1 km2 to 91 km2 and the home ranges of the P. trigonatus varied from < 1km2 to 5 km2. The species responded differently to time since filling and water level in weekly movement and home range. However, overall the dam appears to have had little effect on the use of space by the individuals that were present before dam construction.
Data from: The effect of dam construction on the movement of dwarf caimans, Paleosuchus trigonatus and Paleosuchus palpebrosus, in Brazilian Amazonia
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