Abstract:Las sabanas inundables son un bioma importante para la diversidad y funcionalidad de lascomunidades ícticas del Orinoco. Estas sabanas tienen gran conectividad y diversidad ecosistémica,incluida la conformación de diferentes tipos de humedales, por lo que comprender la forma en quesus comunidades de peces se estructuran en los diversos ambientes es clave para la conservaciónbiológica. El objetivo de este estudio fue determinar la diversidad, la composición y la estructura delos ensamblajes ícticos en los humed… Show more
“…Additionally, the proximity of the sampling stations and the stability of the physicochemical conditions of the water, allow a constant change of species along the stream. This finding is consistent with what was observed by Sánchez, Castro, Galvis, (1996) and Ospina-O et al (2021), who found no changes in fish richness at a temporal level, for some rivers and wetlands of the Casanare and Meta floodplains. Regarding the diversity of order q = 1 and 2, it was found that the high-water period presented the highest values of common and dominant species, this behavior could be attributed to the increase in abundance of some species found in larval and juvenile stages, as is the case of Agamyxis albomaculatus, Amblydoras gonzalezi, Apistogramma hongsloi, Astyanax aff.…”
Section: Discussionsupporting
confidence: 93%
“…Currently, one of the challenges of ecology and conservation biology is to understand the factors that determine the richness, abundance, and distribution of species in megadiverse regions (Arrington and Winemiller, 2005), due to the crisis of biodiversity loss produced by anthropogenic impacts (Cardinale et al, 2012;Montoya-Ospina, López-Delgado, Hevia, Villa-Navarro, 2020). For the Colombian Orinoquia, most of the studies on fish communities have focused on the surveying (Urbano-Bonilla et al, 2009;Ramírez-Gil et al, 2011;Villa-Navarro et al, 2011;Maldonado-Ocampo et al, 2013;Urbano-Bonilla et al, 2014;Usma et al, 2016;Zamudio et al, 2017;Urbano-Bonilla et al, 2018), and a few studies have focused on fish assemblages, based on habitat structural complexity (Montoya-Ospina et al, 2020;Lasso et al, 2021) and temporality (Ospina-O, Bedoya-Giraldo, Villa-Navarro, 2021). Therefore, the objective of this study was to describe the fish assemblage of the Mitimiti stream and test the hypothesis that they vary at a spatial and temporal level.…”
The distribution and abundance of fish for the Orinoco River basin drainages are influenced by hydrometric seasonality and the structural complexity of the habitat, so understanding how fish assemblages are structured on a temporal and spatial scale is essential for biological conservation. Therefore, the purpose of this study was to describe the fish assemblage for the Mitimiti stream and test the hypothesis of spatial and temporal variation. To do this, collections were made at four sampling stations on the Mitimiti stream, during three contrasting rainfall seasons, with the help of a 10 m x 1.5 m trawl net and a 2 mm mesh eye. The diversity of fish assemblages was analyzed using Hill numbers, abundance-based dissimilarity, and a Canonical Correspondence Analysis (CCA). In total, 2493 individuals and 115 species were recorded, where the orders with the highest dominance were Characiformes and Blenniiformes. Regarding the diversity of order q = 0, no significant differences were found between the hydrological periods and the sampling stations, however, the low water period and St3 exhibited the highest species richness. The most dissimilar hydrological period was the high water season and the variables that significantly influenced fish assemblage were water temperature (p = 0.02) and dissolved oxygen (p = 0.05).
“…Additionally, the proximity of the sampling stations and the stability of the physicochemical conditions of the water, allow a constant change of species along the stream. This finding is consistent with what was observed by Sánchez, Castro, Galvis, (1996) and Ospina-O et al (2021), who found no changes in fish richness at a temporal level, for some rivers and wetlands of the Casanare and Meta floodplains. Regarding the diversity of order q = 1 and 2, it was found that the high-water period presented the highest values of common and dominant species, this behavior could be attributed to the increase in abundance of some species found in larval and juvenile stages, as is the case of Agamyxis albomaculatus, Amblydoras gonzalezi, Apistogramma hongsloi, Astyanax aff.…”
Section: Discussionsupporting
confidence: 93%
“…Currently, one of the challenges of ecology and conservation biology is to understand the factors that determine the richness, abundance, and distribution of species in megadiverse regions (Arrington and Winemiller, 2005), due to the crisis of biodiversity loss produced by anthropogenic impacts (Cardinale et al, 2012;Montoya-Ospina, López-Delgado, Hevia, Villa-Navarro, 2020). For the Colombian Orinoquia, most of the studies on fish communities have focused on the surveying (Urbano-Bonilla et al, 2009;Ramírez-Gil et al, 2011;Villa-Navarro et al, 2011;Maldonado-Ocampo et al, 2013;Urbano-Bonilla et al, 2014;Usma et al, 2016;Zamudio et al, 2017;Urbano-Bonilla et al, 2018), and a few studies have focused on fish assemblages, based on habitat structural complexity (Montoya-Ospina et al, 2020;Lasso et al, 2021) and temporality (Ospina-O, Bedoya-Giraldo, Villa-Navarro, 2021). Therefore, the objective of this study was to describe the fish assemblage of the Mitimiti stream and test the hypothesis that they vary at a spatial and temporal level.…”
The distribution and abundance of fish for the Orinoco River basin drainages are influenced by hydrometric seasonality and the structural complexity of the habitat, so understanding how fish assemblages are structured on a temporal and spatial scale is essential for biological conservation. Therefore, the purpose of this study was to describe the fish assemblage for the Mitimiti stream and test the hypothesis of spatial and temporal variation. To do this, collections were made at four sampling stations on the Mitimiti stream, during three contrasting rainfall seasons, with the help of a 10 m x 1.5 m trawl net and a 2 mm mesh eye. The diversity of fish assemblages was analyzed using Hill numbers, abundance-based dissimilarity, and a Canonical Correspondence Analysis (CCA). In total, 2493 individuals and 115 species were recorded, where the orders with the highest dominance were Characiformes and Blenniiformes. Regarding the diversity of order q = 0, no significant differences were found between the hydrological periods and the sampling stations, however, the low water period and St3 exhibited the highest species richness. The most dissimilar hydrological period was the high water season and the variables that significantly influenced fish assemblage were water temperature (p = 0.02) and dissolved oxygen (p = 0.05).
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