Cohort-Dependent Sex Ratio Biases in the American Crocodiles (Crocodylus acutus) of the Tempisque Basin
A male-biased sex ratio of 3:1 has been reported for a population of American crocodiles (Crocodylus acutus) in the Tempisque River Basin, Guanacaste, Costa Rica. If confirmed, this would constitute one of the largest male-biased sex ratios reported for any population of a member of the genus Crocod...
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| Veröffentlicht in: | Copeia 2015-10, Vol.103 (3), p.541-545 |
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| creator | Murray, Christopher M Easter, Michael Padilla, Sergio Garrigós, Davinia B Stone, Julia Ann Bolaños-Montero, Juan Sasa, Mahmood Guyer, Craig |
| description | A male-biased sex ratio of 3:1 has been reported for a population of American crocodiles (Crocodylus acutus) in the Tempisque River Basin, Guanacaste, Costa Rica. If confirmed, this would constitute one of the largest male-biased sex ratios reported for any population of a member of the genus Crocodylus. Here, we examine the aforementioned population of C. acutus and report on sex ratios of hatchling, juvenile, and adult age classes within a sample of 474 crocodiles captured in the Tempisque Basin between May 2012 and June 2014. Hatchling sex ratio is exceptionally male biased (3.5:1), an imbalance that is maintained in juveniles but is reduced in adults (1.5:1). Mark–recapture data document that juvenile males disperse from the study site, potentially to avoid competition, a process that reduces male bias in the adult age class. An increased role of males in human–crocodile conflict may be a result of juvenile males dispersing to human-inhabited areas. |
| doi_str_mv | 10.1643/CE-14-186 |
| format | Article |
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If confirmed, this would constitute one of the largest male-biased sex ratios reported for any population of a member of the genus Crocodylus. Here, we examine the aforementioned population of C. acutus and report on sex ratios of hatchling, juvenile, and adult age classes within a sample of 474 crocodiles captured in the Tempisque Basin between May 2012 and June 2014. Hatchling sex ratio is exceptionally male biased (3.5:1), an imbalance that is maintained in juveniles but is reduced in adults (1.5:1). Mark–recapture data document that juvenile males disperse from the study site, potentially to avoid competition, a process that reduces male bias in the adult age class. 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An increased role of males in human–crocodile conflict may be a result of juvenile males dispersing to human-inhabited areas.</description><subject>Bias</subject><subject>Canals</subject><subject>Competition</subject><subject>Crocodylus</subject><subject>Crocodylus acutus</subject><subject>Demography</subject><subject>Freshwater</subject><subject>Males</subject><subject>Minors</subject><subject>National parks</subject><subject>Population</subject><subject>s</subject><subject>Sexes</subject><issn>0045-8511</issn><issn>2766-1512</issn><issn>1938-5110</issn><issn>2766-1520</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2015</creationdate><recordtype>article</recordtype><sourceid>BENPR</sourceid><recordid>eNp90M9P5CAUB3CycZMdfxz8A4wkHtRDd6EUSo9jHXWTSTbZ0TOh9KFMOmWENtH_XsYaDx48ECDfz-ORh9AxJb-pKNifepHRIqNS_EAzWjGZcUrJHpoRUvBMpssvtB_jmhBSSspn6LH2Tz4M2TVsoW-hH_AKXvB_PTiPr5yOELHr8fAEeL6B4IzucR288a3rUnQxnV-7MWJtxmGMl9jbd34Pm62LzyPgKx1df4h-Wt1FOPrYD9DDzeK-vsuW_27_1vNl1jAhh6yQXEgjbc5EYa3OBaMVNG3Fct4aYqAsG95yDaSiFSkZcNFwaywXAKKpWsMO0MX07jb41DwOauOiga7TPfgxKlqmUplKy0TPvtC1H0OffpcUKzmVldipy0mZ4GMMYNU2uI0Or4oStRu5qheKFiqNPNmTya7j4MMnzAvBJKO7_HTKrfZKPwYX1cMqJ1SQtFhBeBLnk2ic9z180-sNvRqRyQ</recordid><startdate>20151001</startdate><enddate>20151001</enddate><creator>Murray, Christopher M</creator><creator>Easter, Michael</creator><creator>Padilla, Sergio</creator><creator>Garrigós, Davinia B</creator><creator>Stone, Julia Ann</creator><creator>Bolaños-Montero, Juan</creator><creator>Sasa, Mahmood</creator><creator>Guyer, Craig</creator><general>The American Society of Ichthyologists and Herpetologists</general><general>American Society of Ichthyologists and Herpetologists</general><scope>FBQ</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>3V.</scope><scope>4T-</scope><scope>4U-</scope><scope>7QG</scope><scope>7QP</scope><scope>7QR</scope><scope>7SN</scope><scope>7TK</scope><scope>88A</scope><scope>8AO</scope><scope>8FD</scope><scope>8FE</scope><scope>8FH</scope><scope>8FK</scope><scope>ABUWG</scope><scope>AEUYN</scope><scope>AFKRA</scope><scope>AZQEC</scope><scope>BBNVY</scope><scope>BENPR</scope><scope>BHPHI</scope><scope>BKSAR</scope><scope>C1K</scope><scope>CCPQU</scope><scope>DWQXO</scope><scope>F1W</scope><scope>FR3</scope><scope>GNUQQ</scope><scope>H95</scope><scope>HCIFZ</scope><scope>L.G</scope><scope>LK8</scope><scope>M7N</scope><scope>M7P</scope><scope>P64</scope><scope>PCBAR</scope><scope>PQEST</scope><scope>PQQKQ</scope><scope>PQUKI</scope><scope>PRINS</scope><scope>RC3</scope><scope>7TN</scope></search><sort><creationdate>20151001</creationdate><title>Cohort-Dependent Sex Ratio Biases in the American Crocodiles (Crocodylus acutus) of the Tempisque Basin</title><author>Murray, Christopher M ; 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| source | Jstor Complete Legacy |
| subjects | Bias Canals Competition Crocodylus Crocodylus acutus Demography Freshwater Males Minors National parks Population s Sexes |
| title | Cohort-Dependent Sex Ratio Biases in the American Crocodiles (Crocodylus acutus) of the Tempisque Basin |
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