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[Spatial and temporal variation in diet composition of invertivore fishes in a tropical stream, Venezuela].
Rev Biol Trop 2011; 59(3):1217-31RB

Abstract

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) 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.

Authors+Show Affiliations

Instituto de Biología Experimental, Universidad Central de Venezuela, Apartado postal 48170, Caracas 1041A, Venezuela. maortaz@hotmail.comNo affiliation info availableNo affiliation info available

Pub Type(s)

English Abstract
Journal Article
Research Support, Non-U.S. Gov't

Language

spa

PubMed ID

22017127

Citation

Ortaz, Mario, et al. "[Spatial and Temporal Variation in Diet Composition of Invertivore Fishes in a Tropical Stream, Venezuela]." Revista De Biologia Tropical, vol. 59, no. 3, 2011, pp. 1217-31.
Ortaz M, Martín R, López-Ordaz A. [Spatial and temporal variation in diet composition of invertivore fishes in a tropical stream, Venezuela]. Rev Biol Trop. 2011;59(3):1217-31.
Ortaz, M., Martín, R., & López-Ordaz, A. (2011). [Spatial and temporal variation in diet composition of invertivore fishes in a tropical stream, Venezuela]. Revista De Biologia Tropical, 59(3), pp. 1217-31.
Ortaz M, Martín R, López-Ordaz A. [Spatial and Temporal Variation in Diet Composition of Invertivore Fishes in a Tropical Stream, Venezuela]. Rev Biol Trop. 2011;59(3):1217-31. PubMed PMID: 22017127.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - [Spatial and temporal variation in diet composition of invertivore fishes in a tropical stream, Venezuela]. AU - Ortaz,Mario, AU - Martín,Ricardo, AU - López-Ordaz,Adriana, PY - 2011/10/25/entrez PY - 2011/10/25/pubmed PY - 2011/12/13/medline SP - 1217 EP - 31 JF - Revista de biologia tropical JO - Rev. Biol. Trop. VL - 59 IS - 3 N2 - 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) 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. SN - 0034-7744 UR - https://www.unboundmedicine.com/medline/citation/22017127/[Spatial_and_temporal_variation_in_diet_composition_of_invertivore_fishes_in_a_tropical_stream_Venezuela]_ DB - PRIME DP - Unbound Medicine ER -