Population structure and allometry of Podocnemis unifilis (Testudines, Podocnemididae) in a protected area upstream Belo Monte dam in Xingu River, Brazil
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| Natura: | Artículo científico |
| Lingua: | en |
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Academia Brasileira de Ciências
2015
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| _version_ | 1876458392425332736 |
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| author | PRISCILA S. MIORANDO |
| author_facet | PRISCILA S. MIORANDO |
| contents | Population structure and allometry of Podocnemis unifilis (Testudines, Podocnemididae) in a protected area upstream Belo Monte dam in Xingu River, Brazil PRISCILA S. MIORANDO TOMMASO GIARRIZZO JUAREZ C.B. PEZZUTI Multidisciplinaria (Ciencias Naturales y Exactas) Amazon length tracajá sex ratio clear water river Amazon river turtles are increasingly threatened by habitat loss and alteration due to the Brazilian energy policy based on construction of hydroelectric dams, meanwhile, populational studies remain scarce. We described the population structure, and established body allometric relationships of Podocnemis unifilis in the Terra do Meio Ecological Station in the Iriri River, tributary of the Xingu River upstream the Belo Monte dam under construction. Turtles were captured by hand net and diving in 2012 and 2013 dry seasons, and 2013 rainy season. A total of 728 males, 296 females and four juveniles were captured. Adult sex ratio was male-biased by 9.15♂:1♀. Females were significantly larger than males. Mean straight carapace length was 268.9 ± 46.7 mm (165 – 403) for females; and 232.7 ± 24.8 mm (167 – 303) for males. The sexes were morphologically distinct in function of a proportionally larger plastron, and higher carapace, on females. Allometric relationships between straight carapace length and other morphometric traits were strong for males (R2 range = 0.87 - 0.96) and females (R2 range = 0.79 - 0.98). Exploitation of P. unifilis in biomass extirpated from the Middle Xingu River may be estimated from body parts found post-consumption by the presented regressions. 2015 artículo científico 0001-3765 https://www.redalyc.org/articulo.oa?id=32743236014 en http://www.redalyc.org/revista.oa?id=327 Anais da Academia Brasileira de Ciências application/pdf Academia Brasileira de Ciências Anais da Academia Brasileira de Ciências (Brasil) Num.4 Vol.87 |
| format | Artículo científico |
| id | redalyc_32743236014 |
| institution | Redalyc |
| language | en |
| publishDate | 2015 |
| publisher | Academia Brasileira de Ciências |
| spellingShingle | Population structure and allometry of Podocnemis unifilis (Testudines, Podocnemididae) in a protected area upstream Belo Monte dam in Xingu River, Brazil PRISCILA S. MIORANDO Multidisciplinaria (Ciencias Naturales y Exactas) Amazon length tracajá sex ratio clear water river Population structure and allometry of Podocnemis unifilis (Testudines, Podocnemididae) in a protected area upstream Belo Monte dam in Xingu River, Brazil PRISCILA S. MIORANDO TOMMASO GIARRIZZO JUAREZ C.B. PEZZUTI Multidisciplinaria (Ciencias Naturales y Exactas) Amazon length tracajá sex ratio clear water river Amazon river turtles are increasingly threatened by habitat loss and alteration due to the Brazilian energy policy based on construction of hydroelectric dams, meanwhile, populational studies remain scarce. We described the population structure, and established body allometric relationships of Podocnemis unifilis in the Terra do Meio Ecological Station in the Iriri River, tributary of the Xingu River upstream the Belo Monte dam under construction. Turtles were captured by hand net and diving in 2012 and 2013 dry seasons, and 2013 rainy season. A total of 728 males, 296 females and four juveniles were captured. Adult sex ratio was male-biased by 9.15♂:1♀. Females were significantly larger than males. Mean straight carapace length was 268.9 ± 46.7 mm (165 – 403) for females; and 232.7 ± 24.8 mm (167 – 303) for males. The sexes were morphologically distinct in function of a proportionally larger plastron, and higher carapace, on females. Allometric relationships between straight carapace length and other morphometric traits were strong for males (R2 range = 0.87 - 0.96) and females (R2 range = 0.79 - 0.98). Exploitation of P. unifilis in biomass extirpated from the Middle Xingu River may be estimated from body parts found post-consumption by the presented regressions. 2015 artículo científico 0001-3765 https://www.redalyc.org/articulo.oa?id=32743236014 en http://www.redalyc.org/revista.oa?id=327 Anais da Academia Brasileira de Ciências application/pdf Academia Brasileira de Ciências Anais da Academia Brasileira de Ciências (Brasil) Num.4 Vol.87 |
| title | Population structure and allometry of Podocnemis unifilis (Testudines, Podocnemididae) in a protected area upstream Belo Monte dam in Xingu River, Brazil |
| topic | Multidisciplinaria (Ciencias Naturales y Exactas) Amazon length tracajá sex ratio clear water river |
| url | https://www.redalyc.org/articulo.oa?id=32743236014 |