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7 results for “Crocodylus moreletii”
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>
Data from: Genetic and morphological evidence of a geographically widespread hybrid zone between two crocodile species, Crocodylus acutus and Crocodylus moreletii
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Out with the old, introgression with the new: Signals of ancient and recent admixture in hybridizing Mesoamerican crocodiles (Crocodylus acutus x Crocodylus moreletii)
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Figure 2 in Fauna associated with the nests of Crocodylus moreletii and Crocodylus moreletii × acutus in Belize
Figure 2. Map of Belize showing major population centres and approximate location of our study sites (1992–2000). 1. Sapote Lagoon. 2. Gold Button Lagoon. 3. Rio Hondo wetlands. 4. New River, New River Lagoon, and associated wetlands. 5. Habanero Lagoon. 6. Gallon Jug. 7. Cox Lagoon. 8. Banana Bank Ranch. 9. Monkey River. 10. Bladen-Swasey River. 11. Payne's Creek. 12. Temash River. Inset shows the location of Belize in relation to other Caribbean countries.
Figure 1 in Fauna associated with the nests of Crocodylus moreletii and Crocodylus moreletii × acutus in Belize
Figure 1. Typical mound nest of Morelet's Crocodile (Crocodylus moreletii) composed of vegetation (largely Typha) and soil on a small island at Gold Button Lagoon in northern Belize (a). Nest mound constructed by hybrid crocodile (C. moreletii × acutus) along a river in southern Belize. Boat paddle is approximately 1.4 m long (b). Nest mound opened to expose hybrid crocodile eggs (c).
Figure 4 in Fauna associated with the nests of Crocodylus moreletii and Crocodylus moreletii × acutus in Belize
Figure 4. Black-bellied whistling-duck (Dendrocygna autumnalis) nest found in close proximity to a C. moreletii nest on an island in Gold Button Lagoon, northern Belize (a). Photograph showing location of duck nest (yellow notebook at lower left) relative to crocodile nest (white arrow) among dense tangle of vines covering the small island (b).
Figure 3 in Fauna associated with the nests of Crocodylus moreletii and Crocodylus moreletii × acutus in Belize
Figure 3. Clutch of neotropical slider (Trachemys venusta) eggs (right) found in a C. moreletii nest containing 21 crocodile eggs (left) at Gold Button Lagoon in northern Belize.
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