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272 results for “crocodiles”
Image 4. A in Status and conservation of crocodiles in the Koshi Tappu Wildlife Reserve, eastern Nepal
Image 4. A - Movement of the livestock along the shoreline; B - People came to collect the firewood; C - Human activities along the bank of the edge of the river; D - Low level of water in the Tetriganchital in summer
Image 3. A & B in Status and conservation of crocodiles in the Koshi Tappu Wildlife Reserve, eastern Nepal
Image 3. A & B - The mugger using the same basking platform; C - An adult mugger crawling on the sand bank; D - A mark due to its crawl; E & F - "U" shaped marks due to its crawl
Data from: Genetic and morphological evidence of a geographically widespread hybrid zone between two crocodile species, Crocodylus acutus and Crocodylus moreletii
<p>Hybrid zones represent natural laboratories to study gene flow, divergence and the nature of species boundaries between closely related taxa. We evaluated the level and extent of hybridization between <em>Crocodylus moreletii </em>and<em> C. acutus </em>using genetic and morphological data on 300 crocodiles from 65 localities. To our knowledge, this is the first genetic study that includes the entire historic range and sympatric zone of the two species. Contrary to expectations, Bayesian admixture proportions and maximum likelihood estimates of hybrid indexes revealed that most sampled crocodiles were admixed and that the hybrid zone is geographically extensive, extending well beyond their historical region of sympatry. We identified a few geographically isolated, non-admixed populations of both parental species. Hybrids do not appear to be F<sub>1</sub>s or recent backcrosses, but rather are more likely later-generation hybrids, suggesting that hybridization has been going on for several to many generations and is mostly the result of natural processes. <em>C. moreletii </em>is not the sister species of <em>C. acutus,</em> suggesting that the hybrid zone formed from secondary contact rather than primary divergence. Non-admixed individuals from the two species were distinguishable based on morphological characters, whereas hybrids had a complex mosaic of morphological characters that hinders identification in the wild. Very few non-admixed <em>C. acutus</em> and <em>C. moreletii</em> populations exist in the wild. Consequently, the last non-admixed <em>C. moreletii</em> populations have become critically endangered. Indeed, not only the parental species but also the naturally occurring hybrids should be considered for their potential conservation value.</p>
Triangular Mesh of the Brain of a Nile Crocodile (Crocodylus niloticus)
<p>Triangular Mesh of the Brain of a Nile Crocodile (<i>Crocodylus niloticus</i>) from http://braincatalogue.org/Nile_crocodile</p>
Fig. 6 in Larval development and breeding ecology of Ziegler's Crocodile Newt, Tylototriton ziegleri Nishikawa, Matsui and Nguyen, 2013 (Caudata: Salamandridae), compared to other Tylototriton representatives
Fig. 6. Tylototriton ziegleri larvae from Bao Lac district, Cao Bang Province with indication of the corresponding developmental stage and scale. Photographs of stages 27 to 36 are from preserved eggs photographed under a digital microscope (photos C. Michel) and photographs of stages 44 and 45 are from individuals in life kept at the Me Linh station (photos T. Ziegler).
Fig. 4 in Larval development and breeding ecology of Ziegler's Crocodile Newt, Tylototriton ziegleri Nishikawa, Matsui and Nguyen, 2013 (Caudata: Salamandridae), compared to other Tylototriton representatives
Fig. 4. Drawing of a formol-preserved larva of Tylototriton ziegleri at stage 35. Drawing C. Michel.
Fig. 2 in Larval development and breeding ecology of Ziegler's Crocodile Newt, Tylototriton ziegleri Nishikawa, Matsui and Nguyen, 2013 (Caudata: Salamandridae), compared to other Tylototriton representatives
Fig. 2. Percentage of the number of adults of Tylototriton vietnamensis and T. ziegleri found at each interval of percentage of canopy cover measured above the water of the breeding site.
Fig. 5 in Larval development and breeding ecology of Ziegler's Crocodile Newt, Tylototriton ziegleri Nishikawa, Matsui and Nguyen, 2013 (Caudata: Salamandridae), compared to other Tylototriton representatives
Fig. 5. Metamorph of Tylototriton ziegleri at stage 44, with an additional finger on left hand, collected in Ha Giang Province in 2012 and preserved in ethanol. Photo M. Bernardes.
Fig. 1. A in Larval development and breeding ecology of Ziegler's Crocodile Newt, Tylototriton ziegleri Nishikawa, Matsui and Nguyen, 2013 (Caudata: Salamandridae), compared to other Tylototriton representatives
Fig. 1. A. Adult male of Tylototriton ziegleri; B. Habitat type in Bao Lac district, Cao Bang Province; C. Adult male of Tylototriton vietnamensis; D. Habitat type in Tay Yen Tu Nature Reserve, Bac Giang Province. Photos M. Bernardes.
Fig. 7 in Larval development and breeding ecology of Ziegler's Crocodile Newt, Tylototriton ziegleri Nishikawa, Matsui and Nguyen, 2013 (Caudata: Salamandridae), compared to other Tylototriton representatives
Fig. 7. Dark and light phenotypic variations of Tylototriton vietnamensis found at the type locality. Photo M. Bernardes.
Fig. 3. A in Larval development and breeding ecology of Ziegler's Crocodile Newt, Tylototriton ziegleri Nishikawa, Matsui and Nguyen, 2013 (Caudata: Salamandridae), compared to other Tylototriton representatives
Fig. 3. A: Typical clutch of Tylototriton ziegleri composed by single eggs; B: an exceptional case of "stickiness" where eggs were aggregated in groups of 2–4. Photos M. Bernardes.
Fig. 40 in Contributions to the herpetofauna of the Angolan Okavango-Cuando-Zambezi River drainages. Part 2: Lizards (Sauria), chelonians, and crocodiles
Fig. 40. Subadult female Pelusios bechuanicus (PEM R27408) from Lake Hundo. Photo by Werner Conradie.
Fig. 33 in Contributions to the herpetofauna of the Angolan Okavango-Cuando-Zambezi River drainages. Part 2: Lizards (Sauria), chelonians, and crocodiles
Fig. 33. Adult unsexed Trachylepis cf. punctulata from Quembo River source. Photo by Werner Conradie.
Fig. 29 in Contributions to the herpetofauna of the Angolan Okavango-Cuando-Zambezi River drainages. Part 2: Lizards (Sauria), chelonians, and crocodiles
Fig. 29. Adult unsexed Sepsina angolensis (PEM R23498) from Cuanavale River source. Photo by Werner Conradie.
Fig. 30 in Contributions to the herpetofauna of the Angolan Okavango-Cuando-Zambezi River drainages. Part 2: Lizards (Sauria), chelonians, and crocodiles
Fig. 30. Adult unsexed Trachylepis albopunctata (PEM R23256) from south of Menongue. Photo by Werner Conradie.
Fig. 35 in Contributions to the herpetofauna of the Angolan Okavango-Cuando-Zambezi River drainages. Part 2: Lizards (Sauria), chelonians, and crocodiles
Fig. 35. Adult female Trachylepis sulcata ansorgii (PEM R23368) from en route between Huambo and Cuito. Photo by Luke Verburgt.
Fig. 25 in Contributions to the herpetofauna of the Angolan Okavango-Cuando-Zambezi River drainages. Part 2: Lizards (Sauria), chelonians, and crocodiles
Fig. 25. Juvenile Ichnotropis cf. grandiceps (PEM R23300) from Cuanavale River source. Photo by Werner Conradie.
Fig. 38 in Contributions to the herpetofauna of the Angolan Okavango-Cuando-Zambezi River drainages. Part 2: Lizards (Sauria), chelonians, and crocodiles
Fig. 38. Adult unsexed Varanus niloticus from en route between the Munhango and Cuanavale River sources. Photo by Werner Conradie.
Fig. 22 in Contributions to the herpetofauna of the Angolan Okavango-Cuando-Zambezi River drainages. Part 2: Lizards (Sauria), chelonians, and crocodiles
Fig. 22. Juvenile Ichnotropis capensis (iNaturalist 12228725) from east of Cuemba. Photo by Alex Rebelo.
Fig. 26 in Contributions to the herpetofauna of the Angolan Okavango-Cuando-Zambezi River drainages. Part 2: Lizards (Sauria), chelonians, and crocodiles
Fig. 26. Subadult male Eumecia anchietae (PEM R23983) from Lungwebungu River campsite. Photo by Werner Conradie.
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Allen Brain Atlas
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DANDI Archive for NWB datasets
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International Brain Laboratory public data
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OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.