Variación espacial y temporal en la composición de la dieta de peces invertívoros en un río neotropical, Venezuela

Invertivores fishes are an important component of neotropical streams and they represent a link between aquatic invertebrates and piscivorous species. This study evaluated the breadth diet and interspecific food overlap of nine invertivores fish species during three consecutive hydrological phases:...

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Autores principales:	Ortaz, Mario, Martín, Ricardo, López-Ordaz, Adriana
Formato:	Online
Idioma:	spa
Publicado:	Universidad de Costa Rica 2011
Acceso en línea:	https://revistas.ucr.ac.cr/index.php/rbt/article/view/3393

id	RBT3393
record_format	ojs
spelling	RBT33932022-06-06T18:58:21Z Variación espacial y temporal en la composición de la dieta de peces invertívoros en un río neotropical, Venezuela Variación espacial y temporal en la composición de la dieta de peces invertívoros en un río neotropical, Venezuela Ortaz, Mario Martín, Ricardo López-Ordaz, Adriana trophic ecology Characiformes invertivores fishes neotropical stream Venezuela ecología trófica peces invertívoros río neotropical Invertivores fishes are an important component of neotropical streams and they represent a link between aquatic invertebrates and piscivorous species. This study evaluated the breadth diet and interspecific food overlap of nine invertivores fish species during three consecutive hydrological phases: falling (December/07, January/08, February/08 and March/08), low (April/08) and rising waters (June/08), in two sections of a Venezuelan neotropical stream, which were located at different elevation, high watershed (HW) and low watershed (LW). The fishes were collected with a beach seine (5mm mesh) between 8:00 and 11:00 hours. The diet of each species was evaluated using an index of relative importance (IRI), which includes as variables the number, weight and occurrence frequency of food items consumed. The Levin' index (B i) and Morisita (IM) were used to estimate the breadth diet and interspecific food overlap, respectively. All estimations were made using the numeric proportion of preys. Nine fish species were captured, eight Characiformes, of which three were captured in HW (Knodus deuteronoides, Creagrutus bolivari and C. melasma) and five in LW (Thoracocharax stellatus, Moenkhausia lepidura, Cheirodon pulcher, Ctenobrycon spilurus and Aphyocharax alburnus), and one Cyprinodontiformes (Poecilia reticulata), which was also found in HW. In HW aquatic insects were the main resource consumed by fishes while plant material and terrestrial arthropods were secondary resources. In LW the fishes ingested all of these items in addition to zooplankton (Copepoda, Cladocera and larval stages of Decapoda). However, there was a temporal replacement with a predominance of zooplankton in falling and low water. In general, the breadth diet decreased during the falling water in both sections and increased in rising water. However, the average breadth diet was higher in HW. The interspecific food overlap was high in HW while low values were more frequent in LW and its temporal variation was opposed in both sections during almost all the sampling period. Universidad de Costa Rica 2011-09-01 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Article Text application/pdf https://revistas.ucr.ac.cr/index.php/rbt/article/view/3393 10.15517/rbt.v0i0.3393 Revista de Biología Tropical; Vol. 59 No. 3 (2011): Volume 59 – Regular number 3 – September 2011; 1217–1231 Revista de Biología Tropical; Vol. 59 Núm. 3 (2011): Volumen 59 – Número regular 3 – Setiembre 2011; 1217–1231 Revista Biología Tropical; Vol. 59 N.º 3 (2011): Volume 59 – Regular number 3 – September 2011; 1217–1231 2215-2075 0034-7744 10.15517/rbt.v0i0 spa https://revistas.ucr.ac.cr/index.php/rbt/article/view/3393/3297 Copyright (c) 2011 Revista de Biología Tropical http://creativecommons.org/licenses/by/4.0
institution	Universidad de Costa Rica
collection	Revista de Biología Tropical
language	spa
format	Online
author	Ortaz, Mario Martín, Ricardo López-Ordaz, Adriana
spellingShingle	Ortaz, Mario Martín, Ricardo López-Ordaz, Adriana Variación espacial y temporal en la composición de la dieta de peces invertívoros en un río neotropical, Venezuela
author_facet	Ortaz, Mario Martín, Ricardo López-Ordaz, Adriana
author_sort	Ortaz, Mario
description	Invertivores fishes are an important component of neotropical streams and they represent a link between aquatic invertebrates and piscivorous species. This study evaluated the breadth diet and interspecific food overlap of nine invertivores fish species during three consecutive hydrological phases: falling (December/07, January/08, February/08 and March/08), low (April/08) and rising waters (June/08), in two sections of a Venezuelan neotropical stream, which were located at different elevation, high watershed (HW) and low watershed (LW). The fishes were collected with a beach seine (5mm mesh) between 8:00 and 11:00 hours. The diet of each species was evaluated using an index of relative importance (IRI), which includes as variables the number, weight and occurrence frequency of food items consumed. The Levin' index (B i) and Morisita (IM) were used to estimate the breadth diet and interspecific food overlap, respectively. All estimations were made using the numeric proportion of preys. Nine fish species were captured, eight Characiformes, of which three were captured in HW (Knodus deuteronoides, Creagrutus bolivari and C. melasma) and five in LW (Thoracocharax stellatus, Moenkhausia lepidura, Cheirodon pulcher, Ctenobrycon spilurus and Aphyocharax alburnus), and one Cyprinodontiformes (Poecilia reticulata), which was also found in HW. In HW aquatic insects were the main resource consumed by fishes while plant material and terrestrial arthropods were secondary resources. In LW the fishes ingested all of these items in addition to zooplankton (Copepoda, Cladocera and larval stages of Decapoda). However, there was a temporal replacement with a predominance of zooplankton in falling and low water. In general, the breadth diet decreased during the falling water in both sections and increased in rising water. However, the average breadth diet was higher in HW. The interspecific food overlap was high in HW while low values were more frequent in LW and its temporal variation was opposed in both sections during almost all the sampling period.
title	Variación espacial y temporal en la composición de la dieta de peces invertívoros en un río neotropical, Venezuela
title_short	Variación espacial y temporal en la composición de la dieta de peces invertívoros en un río neotropical, Venezuela
title_full	Variación espacial y temporal en la composición de la dieta de peces invertívoros en un río neotropical, Venezuela
title_fullStr	Variación espacial y temporal en la composición de la dieta de peces invertívoros en un río neotropical, Venezuela
title_full_unstemmed	Variación espacial y temporal en la composición de la dieta de peces invertívoros en un río neotropical, Venezuela
title_sort	variación espacial y temporal en la composición de la dieta de peces invertívoros en un río neotropical, venezuela
title_alt	Variación espacial y temporal en la composición de la dieta de peces invertívoros en un río neotropical, Venezuela
publisher	Universidad de Costa Rica
publishDate	2011
url	https://revistas.ucr.ac.cr/index.php/rbt/article/view/3393
work_keys_str_mv	AT ortazmario variacionespacialytemporalenlacomposiciondeladietadepecesinvertivorosenunrioneotropicalvenezuela AT martinricardo variacionespacialytemporalenlacomposiciondeladietadepecesinvertivorosenunrioneotropicalvenezuela AT lopezordazadriana variacionespacialytemporalenlacomposiciondeladietadepecesinvertivorosenunrioneotropicalvenezuela
_version_	1810114511722512384

Variación espacial y temporal en la composición de la dieta de peces invertívoros en un río neotropical, Venezuela

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