Habitat Selection and Migration of Caiman crocodilus crocodilus in a Swamp and Swamp-Forest Habitat in Northern Suriname

Ouboter, Paul E.; Nanhoe, Lurly M.R.

doi:10.2307/1564151

Cited by 35 publications

(20 citation statements)

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“…Size-and maturity-related movement patterns in the Lynd River appear to be consistent with behaviour of C. johnstoni in the McKinlay and Katherine Rivers (Webb et al 1983a;Cooper-Preston 1992). Juvenile C. johnstoni vary widely in the extent and direction of movements, as reported for other juvenile crocodilians (McNease and Joanen 1974;Schaller and Cranshaw 1982;Ouboter and Nanhoe 1988), but as adults, movements become localised in areas that provide suitable food, proximity to mates, nesting banks and burrows. Population density will determine which pools are already occupied and levels of resource competition within pools, but adult females generally move to or remain near suitable nesting substrata while adult males occupy regions that overlap with females.…”

Section: Correlates Of Sex Size Maturity and Body Conditionmentioning

confidence: 65%

Movements and Home Ranges of Crocodylus johnstoni in the Lynd River, Queensland

Tucker¹,

Limpus²,

McCallum³

et al. 1997

Wildl. Res.

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Movements of Australian freshwater crocodiles, Crocodylus johnstoni, were examined by a mark–recapture study spanning 20 years in the Lynd River, Queensland. After adjustment for detection bias, there was a minor upstream direction to movements. Seasonal changes of location were not evident from field trips taken only twice yearly. Annual movements averaged less than 1 km except for those of pubescent males, which appeared to be nomadic. Creche dispersal was randomly directed but associated with a threshold in mass/length ratio. On average, males were found further from previous capture sites than were females. Adults of both sexes moved shorter distances than did immature crocodiles with a clear reduction in movements occurring as mass/length ratios approached 0·17 kg per cm snout–vent length. Reduced movement at that general size ratio probably indicated the onset of territoriality associated with maturity. Females usually remained near breeding sites even in years when they did not breed. Nomadic tendencies of pubescent males are probably associated with unsuccessful attempts at entering local dominance hierarchies. Linear home ranges were estimated to be 1·5–1·9 km for immature animals, 1·2 km for pubescent females, 30·3 km for pubescent males, 0·6 km for mature females and 1·6 km for adult males.

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Section: Correlates Of Sex Size Maturity and Body Conditionmentioning

confidence: 65%

Movements and Home Ranges of Crocodylus johnstoni in the Lynd River, Queensland

Tucker¹,

Limpus²,

McCallum³

et al. 1997

Wildl. Res.

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“…We considered four traits as potential range‐expansion‐promoting characters, three of which have been used previously to reconstruct range‐expansion capabilities in Amphibia (Trakimas et al, ; Van Bocxlaer et al, ). We extracted information from the International Union for Conservation of Nature (IUCN) Crocodile Specialist Group (CSG) data (Manolis & Stevenson, ), the IUCN Red List website, crocodylian.com (hosted by the University of Bristol, the Florida Museum of Natural History and the IUCN–species survival commission Crocodile Specialist Group), the IUCN Amphibia–Reptilia Red Data book and other literature (Bezuijen, Shwedick, Sommerlad, Stevenson, & Steubing, ; Brito, Martinez‐Freiria, Sierra, Sillero, & Tarroso, ; Brunell, Rainwater, Sievering, & Platt, ; Campos, ; Campos, Llobet, Piña, & Magnusson, ; Cox, ; Campos, Muniz, & Magnusson, ; Campos, Sanaiotti, & Magnusson, ; Da silva & Lenin, ; De Thoisy, Hrbek, Farias, Vasconcelos, & Lavergne, ; Dinets, ; Eaton, ; Elsey & Woodward, ; Ferugson, ; Godshalk, ; Greer, ; Greer, ; Grigg & Kirshner, and references therein; Groombridge & Wright, ; Grigg, Moulton, Melo, & Taplin, ; Hall & Johnson, ; Jiang, ; López‐Vila, Schmitter‐Soto, Velázquez‐Velázquez, Barba‐Macías, & Salgado___Ugarte, ; Magnusson & Campos, , ; Mazzotti et al, ; Merchán, ; Milián‐García et al, ; Montini, Pina, Larriera, Siroski, & Verdade, ; Ogden, ; Ouboter & Nanhoe, ; Platt et al, ; Platt, Rainwater, Thorbjarnarson, & Martin, ; Platt, Sigler, & Rainwater, ; Ramos Targarona, Soberón, Tabet, & Thorbjarnarson, ; Read, Grigg, Irwin, Shanahan, & Franklin, ; Shirley, ; Shirley & Austin, ; Shirley & Salem, ; Shirley, Villanova, Vliet, & Austin, ; Stevenson & Whitaker, ; Thobrjarnarson, , ; Thorbjarnarson & Franz, ; Van weerd, ; Velasco...…”

Section: Methodsmentioning

confidence: 99%

Trait‐based range expansion aided in the global radiation of Crocodylidae

Nicolaï

Matzke

2019

Global Ecol Biogeogr

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Aim Almost half of the extant species of Crocodylia (nine genera, sensu Benton & Clark) belong to the genus Crocodylus, which originated in the Miocene. Today, this genus has a circumtropical distribution, with representatives found in Asia, Oceania, Africa and the Neotropics. However, its geographical origin and the historical events behind its rapid diversification and global radiation are still debated. Here, we inferred the evolution of a set of life traits that aid in dispersal and how they influenced the biogeography of Crocodylus. Location Global. Time period Cretaceous to the present. Major taxa studied Crocodylidae. Methods We estimated biogeographical history on a published phylogeny using probabilistic biogeography models. Next, we identified four life traits likely to promote range expansion and used a trait‐based dispersal model jointly to infer evolution of these traits and their influence on the dispersal of crocodilians. Finally, we used diversification analyses to identify shifts in diversification rates. Results An Asian origin was reconstructed for Crocodylus. Despite the small size of the phylogeny, statistical model comparison reports substantially improved the model fit of trait‐dependent over trait‐independent dispersal models. In individual tests, the four life traits considered (salt tolerance, large size, large clutches and habitat generalism) appear to be correlated statistically with higher dispersal probabilities. However, the traits are likely to be correlated with each other, and we hypothesize that they all reflect the gradual evolution of a range‐expansion phenotype in early Crocodylus that resulted in increased diversification of the clade. Main conclusions Increased dispersal in the genus Crocodylus was associated with the gradual evolution of a range‐expansion phenotype. Interestingly, the evolution of the range‐expansion phenotype was also associated with the diversification of the genus in a period of global crocodilian extinction, indicating that range expansion might have served as a potential driver of speciation. This suggests that the concept of “spatial sorting”, normally applied at the population genetic level at the leading edge of an expanding population, might also act on a macroevolutionary scale.

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“…Although previous studies have assumed that crocodilian hatchlings select habitats that are rich in food [38], [49], [50], our field data may be the first to actually demonstrate such a link. If the growth rates of hatchlings are related to food availability [50], hatchlings may concentrate in food-rich areas [32].…”

Section: Discussionmentioning

confidence: 57%

Determinants of Habitat Selection by Hatchling Australian Freshwater Crocodiles

2011

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Animals almost always use habitats non-randomly, but the costs and benefits of using specific habitat types remain unknown for many types of organisms. In a large lake in northwestern Australia (Lake Argyle), most hatchling (<12-month-old) freshwater crocodiles (Crocodylus johnstoni) are found in floating vegetation mats or grassy banks rather than the more widely available open banks. Mean body sizes of young crocodiles did not differ among the three habitat types. We tested four potential explanations for non-random habitat selection: proximity to nesting sites, thermal conditions, food availability, and exposure to predation. The three alternative habitat types did not differ in proximity to nesting sites, or in thermal conditions. Habitats with higher food availability harboured more hatchlings, and feeding rates (obtained by stomach-flushing of recently-captured crocodiles) were highest in such areas. Predation risk may also differ among habitats: we were twice as likely to capture a crocodile after seeing it in open-bank sites than in the other two habitat types. Thus, habitat selection of hatchling crocodiles in this system may be driven both by prey availability and by predation risk.

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Habitat Selection and Migration of Caiman crocodilus crocodilus in a Swamp and Swamp-Forest Habitat in Northern Suriname

Cited by 35 publications

References 13 publications

Movements and Home Ranges of Crocodylus johnstoni in the Lynd River, Queensland

Movements and Home Ranges of Crocodylus johnstoni in the Lynd River, Queensland

Trait‐based range expansion aided in the global radiation of Crocodylidae

Determinants of Habitat Selection by Hatchling Australian Freshwater Crocodiles

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