Dynamics of sex reversal in the marbled swamp eel (Synbranchus marmoratus bloch, 1795), a diandric hermaphrodite from Marechal Dutra Reservoir, northeastern Brazil

This study characterizes the dynamics of sex reversal in the marbled swamp eel, Synbranchus marmoratus (Osteichthyes: Synbranchidae), a diandric hermaphrodite, within the context of managing species with complex sex allocations. Monthly sampling in Marechal Dutra Reservoir, northeastern Brazil, w...

ver descrição completa

Na minha lista:

Detalhes bibliográficos
Principais autores:	Barros, Nirlei Hirachy Costa, Souza, Arrilton Araújo de, Peebles, Ernst Bryan, Chellappa, Sathyabama
Formato:	article
Idioma:	eng
Publicado em:	Wiley
Assuntos:	Hermaphrodite Marechal Dutra Brazil
Endereço do item:	https://repositorio.ufrn.br/jspui/handle/123456789/24651
Tags:	Adicionar Tag Sem tags, seja o primeiro a adicionar uma tag!

id	ri-123456789-24651
record_format	dspace
spelling	ri-123456789-246512022-05-20T18:15:33Z Dynamics of sex reversal in the marbled swamp eel (Synbranchus marmoratus bloch, 1795), a diandric hermaphrodite from Marechal Dutra Reservoir, northeastern Brazil Barros, Nirlei Hirachy Costa Souza, Arrilton Araújo de Peebles, Ernst Bryan Chellappa, Sathyabama Hermaphrodite Marechal Dutra Brazil This study characterizes the dynamics of sex reversal in the marbled swamp eel, Synbranchus marmoratus (Osteichthyes: Synbranchidae), a diandric hermaphrodite, within the context of managing species with complex sex allocations. Monthly sampling in Marechal Dutra Reservoir, northeastern Brazil, was conducted using metal eel traps from July, 2013, to June, 2014, during which a total of 288 individuals were captured. Morphological and histological comparisons of gonads identified four sex types: primary males (n = 18), females (n = 197), transitional individuals (n = 30), and secondary males (n = 43). Primary males were smallest, ranging 18–32 cm total length. Females were numerically dominant throughout the 1-year sampling period, and ranged 20–60 cm. Transitional individuals ranged 32–60 cm, and secondary males ranged 46–74 cm. The otolith-based age of 52 specimens ranged 0.5 to 5+ year. Primary males were only observed at ages 0.5 and 1, and transitional individuals were only observed at ages 3 and 4 during the female-to- secondary- male transition, supporting the existence of two types of individuals: gonochoristic males and protogynous hermaphrodites. This observation was further supported by histological observations of deteriorating ovarian tissue in transitional individuals. Given the length of time required for individuals to attain secondary male status, this species appears to be particularly vulnerable to over-exploitation. Comparisons with results from other studies suggest sex allocations and adult size distributions vary substantially within this species’ range, adding complexity to management efforts 2018-01-24T20:16:21Z 2018-01-24T20:16:21Z 2017 article BARROS, Nirlei Hirachy Costa et al. Dynamics of sex reversal in the marbled swamp eel (Synbranchus marmoratus bloch, 1795), a diandric hermaphrodite from Marechal Dutra reservoir, northeastern Brazil. Journal of Applied Ichthyology, v. 33, p. 443-449, 2017. Disponível em <http://onlinelibrary.wiley.com/doi/10.1111/jai.13273/abstract>. Acesso em: 18 out. 2017. 0175-8659 https://repositorio.ufrn.br/jspui/handle/123456789/24651 10.1111/jai.13273 eng Acesso Aberto Wiley
institution	Repositório Institucional
collection	RI - UFRN
language	eng
topic	Hermaphrodite Marechal Dutra Brazil
spellingShingle	Hermaphrodite Marechal Dutra Brazil Barros, Nirlei Hirachy Costa Souza, Arrilton Araújo de Peebles, Ernst Bryan Chellappa, Sathyabama Dynamics of sex reversal in the marbled swamp eel (Synbranchus marmoratus bloch, 1795), a diandric hermaphrodite from Marechal Dutra Reservoir, northeastern Brazil
description	This study characterizes the dynamics of sex reversal in the marbled swamp eel, Synbranchus marmoratus (Osteichthyes: Synbranchidae), a diandric hermaphrodite, within the context of managing species with complex sex allocations. Monthly sampling in Marechal Dutra Reservoir, northeastern Brazil, was conducted using metal eel traps from July, 2013, to June, 2014, during which a total of 288 individuals were captured. Morphological and histological comparisons of gonads identified four sex types: primary males (n = 18), females (n = 197), transitional individuals (n = 30), and secondary males (n = 43). Primary males were smallest, ranging 18–32 cm total length. Females were numerically dominant throughout the 1-year sampling period, and ranged 20–60 cm. Transitional individuals ranged 32–60 cm, and secondary males ranged 46–74 cm. The otolith-based age of 52 specimens ranged 0.5 to 5+ year. Primary males were only observed at ages 0.5 and 1, and transitional individuals were only observed at ages 3 and 4 during the female-to- secondary- male transition, supporting the existence of two types of individuals: gonochoristic males and protogynous hermaphrodites. This observation was further supported by histological observations of deteriorating ovarian tissue in transitional individuals. Given the length of time required for individuals to attain secondary male status, this species appears to be particularly vulnerable to over-exploitation. Comparisons with results from other studies suggest sex allocations and adult size distributions vary substantially within this species’ range, adding complexity to management efforts
format	article
author	Barros, Nirlei Hirachy Costa Souza, Arrilton Araújo de Peebles, Ernst Bryan Chellappa, Sathyabama
author_facet	Barros, Nirlei Hirachy Costa Souza, Arrilton Araújo de Peebles, Ernst Bryan Chellappa, Sathyabama
author_sort	Barros, Nirlei Hirachy Costa
title	Dynamics of sex reversal in the marbled swamp eel (Synbranchus marmoratus bloch, 1795), a diandric hermaphrodite from Marechal Dutra Reservoir, northeastern Brazil
title_short	Dynamics of sex reversal in the marbled swamp eel (Synbranchus marmoratus bloch, 1795), a diandric hermaphrodite from Marechal Dutra Reservoir, northeastern Brazil
title_full	Dynamics of sex reversal in the marbled swamp eel (Synbranchus marmoratus bloch, 1795), a diandric hermaphrodite from Marechal Dutra Reservoir, northeastern Brazil
title_fullStr	Dynamics of sex reversal in the marbled swamp eel (Synbranchus marmoratus bloch, 1795), a diandric hermaphrodite from Marechal Dutra Reservoir, northeastern Brazil
title_full_unstemmed	Dynamics of sex reversal in the marbled swamp eel (Synbranchus marmoratus bloch, 1795), a diandric hermaphrodite from Marechal Dutra Reservoir, northeastern Brazil
title_sort	dynamics of sex reversal in the marbled swamp eel (synbranchus marmoratus bloch, 1795), a diandric hermaphrodite from marechal dutra reservoir, northeastern brazil
publisher	Wiley
publishDate	2018
url	https://repositorio.ufrn.br/jspui/handle/123456789/24651
work_keys_str_mv	AT barrosnirleihirachycosta dynamicsofsexreversalinthemarbledswampeelsynbranchusmarmoratusbloch1795adiandrichermaphroditefrommarechaldutrareservoirnortheasternbrazil AT souzaarriltonaraujode dynamicsofsexreversalinthemarbledswampeelsynbranchusmarmoratusbloch1795adiandrichermaphroditefrommarechaldutrareservoirnortheasternbrazil AT peeblesernstbryan dynamicsofsexreversalinthemarbledswampeelsynbranchusmarmoratusbloch1795adiandrichermaphroditefrommarechaldutrareservoirnortheasternbrazil AT chellappasathyabama dynamicsofsexreversalinthemarbledswampeelsynbranchusmarmoratusbloch1795adiandrichermaphroditefrommarechaldutrareservoirnortheasternbrazil
_version_	1773961283206381568

Dynamics of sex reversal in the marbled swamp eel (Synbranchus marmoratus bloch, 1795), a diandric hermaphrodite from Marechal Dutra Reservoir, northeastern Brazil

Registros relacionados