The impact of a strong natural hypoxic event on the toadfish Aphos porosus in Coliumo Bay, south-central Chile

The occurrence of natural hypoxic events and coastal marine areas affected by anthropogenic hypoxia has increased over the past decades. In Coliumo Bay, a small shallow bay of the eastern South Pacific, an intense event of natural hypoxia took place in January 2008, causing the mass mortality of fis...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Hernández-Miranda,Eduardo, Quiñones,Renato A, Aedo,Gustavo, Díaz-Cabrera,Ernesto, Cisterna,José
Lenguaje:	English
Publicado:	Universidad de Valparaíso. Facultad de Ciencias del Mar 2012
Materias:	Fish upwelling hypoxia Allee effect Humboldt Current System
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-19572012000300010
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:scielo:S0718-19572012000300010
record_format	dspace
spelling	oai:scielo:S0718-195720120003000102013-03-26The impact of a strong natural hypoxic event on the toadfish Aphos porosus in Coliumo Bay, south-central ChileHernández-Miranda,EduardoQuiñones,Renato AAedo,GustavoDíaz-Cabrera,ErnestoCisterna,José Fish upwelling hypoxia Allee effect Humboldt Current System The occurrence of natural hypoxic events and coastal marine areas affected by anthropogenic hypoxia has increased over the past decades. In Coliumo Bay, a small shallow bay of the eastern South Pacific, an intense event of natural hypoxia took place in January 2008, causing the mass mortality of fish and other components of the benthic and pelagic communities. In the short term (3 months) recovery was observed in species richness as well as in total fish density. Nevertheless, in the medium term (2 years), this event produced negative effects on population size. In particular, the toadfish Aphos porosus, a dominant fish species in Coliumo Bay, showed a progressive decrease in population size since the occurrence of the hypoxic event, associated with a decrease in recruitment. We hypothesized that this reduction in population size lowered the probability of encounter of reproductive adults, decreasing the number of eggs, larvae and ultimately recruits, thus driving the population towards a low density threshold, and eventually, favoring an Allee effect condition. These results provide evidence on the causal relationship between coastal natural hypoxic events, mass mortality, life history and population dynamics. The slow recovery of the A. porosus population size suggests a process in which the population remains vulnerable to new perturbations. The observed population response is an example of the trajectory that some species may follow when faced with increasing occurrences of natural hypoxic events as predicted, for instance, by global warming scenarios.info:eu-repo/semantics/openAccessUniversidad de Valparaíso. Facultad de Ciencias del MarRevista de biología marina y oceanografía v.47 n.3 20122012-12-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-19572012000300010en10.4067/S0718-19572012000300010
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Fish upwelling hypoxia Allee effect Humboldt Current System
spellingShingle	Fish upwelling hypoxia Allee effect Humboldt Current System Hernández-Miranda,Eduardo Quiñones,Renato A Aedo,Gustavo Díaz-Cabrera,Ernesto Cisterna,José The impact of a strong natural hypoxic event on the toadfish Aphos porosus in Coliumo Bay, south-central Chile
description	The occurrence of natural hypoxic events and coastal marine areas affected by anthropogenic hypoxia has increased over the past decades. In Coliumo Bay, a small shallow bay of the eastern South Pacific, an intense event of natural hypoxia took place in January 2008, causing the mass mortality of fish and other components of the benthic and pelagic communities. In the short term (3 months) recovery was observed in species richness as well as in total fish density. Nevertheless, in the medium term (2 years), this event produced negative effects on population size. In particular, the toadfish Aphos porosus, a dominant fish species in Coliumo Bay, showed a progressive decrease in population size since the occurrence of the hypoxic event, associated with a decrease in recruitment. We hypothesized that this reduction in population size lowered the probability of encounter of reproductive adults, decreasing the number of eggs, larvae and ultimately recruits, thus driving the population towards a low density threshold, and eventually, favoring an Allee effect condition. These results provide evidence on the causal relationship between coastal natural hypoxic events, mass mortality, life history and population dynamics. The slow recovery of the A. porosus population size suggests a process in which the population remains vulnerable to new perturbations. The observed population response is an example of the trajectory that some species may follow when faced with increasing occurrences of natural hypoxic events as predicted, for instance, by global warming scenarios.
author	Hernández-Miranda,Eduardo Quiñones,Renato A Aedo,Gustavo Díaz-Cabrera,Ernesto Cisterna,José
author_facet	Hernández-Miranda,Eduardo Quiñones,Renato A Aedo,Gustavo Díaz-Cabrera,Ernesto Cisterna,José
author_sort	Hernández-Miranda,Eduardo
title	The impact of a strong natural hypoxic event on the toadfish Aphos porosus in Coliumo Bay, south-central Chile
title_short	The impact of a strong natural hypoxic event on the toadfish Aphos porosus in Coliumo Bay, south-central Chile
title_full	The impact of a strong natural hypoxic event on the toadfish Aphos porosus in Coliumo Bay, south-central Chile
title_fullStr	The impact of a strong natural hypoxic event on the toadfish Aphos porosus in Coliumo Bay, south-central Chile
title_full_unstemmed	The impact of a strong natural hypoxic event on the toadfish Aphos porosus in Coliumo Bay, south-central Chile
title_sort	impact of a strong natural hypoxic event on the toadfish aphos porosus in coliumo bay, south-central chile
publisher	Universidad de Valparaíso. Facultad de Ciencias del Mar
publishDate	2012
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-19572012000300010
work_keys_str_mv	AT hernandezmirandaeduardo theimpactofastrongnaturalhypoxiceventonthetoadfishaphosporosusincoliumobaysouthcentralchile AT quinonesrenatoa theimpactofastrongnaturalhypoxiceventonthetoadfishaphosporosusincoliumobaysouthcentralchile AT aedogustavo theimpactofastrongnaturalhypoxiceventonthetoadfishaphosporosusincoliumobaysouthcentralchile AT diazcabreraernesto theimpactofastrongnaturalhypoxiceventonthetoadfishaphosporosusincoliumobaysouthcentralchile AT cisternajose theimpactofastrongnaturalhypoxiceventonthetoadfishaphosporosusincoliumobaysouthcentralchile AT hernandezmirandaeduardo impactofastrongnaturalhypoxiceventonthetoadfishaphosporosusincoliumobaysouthcentralchile AT quinonesrenatoa impactofastrongnaturalhypoxiceventonthetoadfishaphosporosusincoliumobaysouthcentralchile AT aedogustavo impactofastrongnaturalhypoxiceventonthetoadfishaphosporosusincoliumobaysouthcentralchile AT diazcabreraernesto impactofastrongnaturalhypoxiceventonthetoadfishaphosporosusincoliumobaysouthcentralchile AT cisternajose impactofastrongnaturalhypoxiceventonthetoadfishaphosporosusincoliumobaysouthcentralchile
_version_	1714202321637867520

The impact of a strong natural hypoxic event on the toadfish Aphos porosus in Coliumo Bay, south-central Chile

Ejemplares similares