Declining densities and reproductive activities of the queen conch Strombus gigas (Mesogastropoda: Strombidae) in Banco Chinchorro, Eastern Caribbean, Mexico

Queen conch is a gastropod inhabiting the Caribbean Sea, it represents the second largest fishery after the spiny lobster, but it has been extensively captured in the area. In order to know its population status in Chinchorro Bank, we determined conch density changes and its effects on reproductive...

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Authors: Alberto De Jesús-Navarrete, Adriana Valencia-Hernández
Format: article
Status:Published version
Publication Date:2013
Country:México
Institution:Instituto Tecnológico de Chetumal
Repository:Redalyc-ITCH
OAI Identifier:oai:redalyc.org:44930117011
Online Access:https://www.redalyc.org/articulo.oa?id=44930117011
Access Level:Open access
Keyword:Biología
mollusk
Allee effect
reproduction
distance sampling
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spelling Declining densities and reproductive activities of the queen conch Strombus gigas (Mesogastropoda: Strombidae) in Banco Chinchorro, Eastern Caribbean, MexicoAlberto De Jesús-NavarreteAdriana Valencia-HernándezBiologíamolluskAllee effectreproductiondistance samplingQueen conch is a gastropod inhabiting the Caribbean Sea, it represents the second largest fishery after the spiny lobster, but it has been extensively captured in the area. In order to know its population status in Chinchorro Bank, we determined conch density changes and its effects on reproductive activities, between July and November 2009. For this, data on conch density, morphology and reproductive activities were obtained from 15 sites within three fishing zones, and compared with previously collected data (1990, 1992, 1994, and 1997). Data showed that adult density decreased with time, from 10 700ind./ha in 1990, to 198ind./h in 2009. Neither egg masses nor spawns were found and mating was only observed once in July 2009. In July, adult (lip>4mm) density in the Southern zone was 23ind./ha whereas in the Northern zone and Central zone densities were 15 and 9ind./ha respectively. In November, density was somewhat higher: Southern zone 96ind./ha; Central zone 39ind./ha and Northern zone had 38ind./ha. In July, mean shell length was 170.80±46.28mm, with a higher median abundance at 180-189mm. In November, higher frequency was 187.63±45.14mm, maximum at 210-219mm interval. For the last 10 years period, mean adult conch densities have diminished in each zone, which might be the main cause of decreased reproductive activities of the conch at Banco Chinchorro. It is therefore an immediate need to analyse the man- agement plan for this species in this Reserve and perhaps to promote a re-population of queen conch and culture activities. Rev. Biol. Trop. 61 (4): 1671-1679. Epub 2013 December 01.Universidad de Costa Rica2013info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdf0034-7744https://www.redalyc.org/articulo.oa?id=44930117011Revista de Biología Tropical (Costa Rica) Num.4 Vol.61reponame:Redalyc-ITCHinstname:Instituto Tecnológico de Chetumalinstacron:ITCHenhttp://www.redalyc.org/revista.oa?id=449Revista de Biología Tropicalinfo:eu-repo/semantics/openAccessoai:redalyc.org:449301170112026-01-26T20:07:20Z
dc.title.none.fl_str_mv Declining densities and reproductive activities of the queen conch Strombus gigas (Mesogastropoda: Strombidae) in Banco Chinchorro, Eastern Caribbean, Mexico
title Declining densities and reproductive activities of the queen conch Strombus gigas (Mesogastropoda: Strombidae) in Banco Chinchorro, Eastern Caribbean, Mexico
spellingShingle Declining densities and reproductive activities of the queen conch Strombus gigas (Mesogastropoda: Strombidae) in Banco Chinchorro, Eastern Caribbean, Mexico
Alberto De Jesús-Navarrete
Biología
mollusk
Allee effect
reproduction
distance sampling
title_short Declining densities and reproductive activities of the queen conch Strombus gigas (Mesogastropoda: Strombidae) in Banco Chinchorro, Eastern Caribbean, Mexico
title_full Declining densities and reproductive activities of the queen conch Strombus gigas (Mesogastropoda: Strombidae) in Banco Chinchorro, Eastern Caribbean, Mexico
title_fullStr Declining densities and reproductive activities of the queen conch Strombus gigas (Mesogastropoda: Strombidae) in Banco Chinchorro, Eastern Caribbean, Mexico
title_full_unstemmed Declining densities and reproductive activities of the queen conch Strombus gigas (Mesogastropoda: Strombidae) in Banco Chinchorro, Eastern Caribbean, Mexico
title_sort Declining densities and reproductive activities of the queen conch Strombus gigas (Mesogastropoda: Strombidae) in Banco Chinchorro, Eastern Caribbean, Mexico
dc.creator.none.fl_str_mv Alberto De Jesús-Navarrete
Adriana Valencia-Hernández
author Alberto De Jesús-Navarrete
author_facet Alberto De Jesús-Navarrete
Adriana Valencia-Hernández
author_role author
author2 Adriana Valencia-Hernández
author2_role author
dc.subject.none.fl_str_mv Biología
mollusk
Allee effect
reproduction
distance sampling
topic Biología
mollusk
Allee effect
reproduction
distance sampling
description Queen conch is a gastropod inhabiting the Caribbean Sea, it represents the second largest fishery after the spiny lobster, but it has been extensively captured in the area. In order to know its population status in Chinchorro Bank, we determined conch density changes and its effects on reproductive activities, between July and November 2009. For this, data on conch density, morphology and reproductive activities were obtained from 15 sites within three fishing zones, and compared with previously collected data (1990, 1992, 1994, and 1997). Data showed that adult density decreased with time, from 10 700ind./ha in 1990, to 198ind./h in 2009. Neither egg masses nor spawns were found and mating was only observed once in July 2009. In July, adult (lip>4mm) density in the Southern zone was 23ind./ha whereas in the Northern zone and Central zone densities were 15 and 9ind./ha respectively. In November, density was somewhat higher: Southern zone 96ind./ha; Central zone 39ind./ha and Northern zone had 38ind./ha. In July, mean shell length was 170.80±46.28mm, with a higher median abundance at 180-189mm. In November, higher frequency was 187.63±45.14mm, maximum at 210-219mm interval. For the last 10 years period, mean adult conch densities have diminished in each zone, which might be the main cause of decreased reproductive activities of the conch at Banco Chinchorro. It is therefore an immediate need to analyse the man- agement plan for this species in this Reserve and perhaps to promote a re-population of queen conch and culture activities. Rev. Biol. Trop. 61 (4): 1671-1679. Epub 2013 December 01.
publishDate 2013
dc.date.none.fl_str_mv 2013
dc.type.none.fl_str_mv info:eu-repo/semantics/publishedVersion
info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv 0034-7744
https://www.redalyc.org/articulo.oa?id=44930117011
identifier_str_mv 0034-7744
url https://www.redalyc.org/articulo.oa?id=44930117011
dc.language.none.fl_str_mv en
language_invalid_str_mv en
dc.relation.none.fl_str_mv http://www.redalyc.org/revista.oa?id=449
dc.rights.none.fl_str_mv Revista de Biología Tropical
info:eu-repo/semantics/openAccess
rights_invalid_str_mv Revista de Biología Tropical
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Universidad de Costa Rica
publisher.none.fl_str_mv Universidad de Costa Rica
dc.source.none.fl_str_mv Revista de Biología Tropical (Costa Rica) Num.4 Vol.61
reponame:Redalyc-ITCH
instname:Instituto Tecnológico de Chetumal
instacron:ITCH
instname_str Instituto Tecnológico de Chetumal
instacron_str ITCH
institution ITCH
reponame_str Redalyc-ITCH
collection Redalyc-ITCH
repository.name.fl_str_mv
repository.mail.fl_str_mv
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