Dinámica de la estructura y composición de macroinvertebrados y su relación con las variables ambientales en la bahía de Buenaventura

Abstract

Buenaventura bay is characterized by a great dynamic of environmental variables. There is descriptive information concerning the distribution of macroinvertebrates in the bay and its habitat, however it is necessary to document on its dynamics in relation to environmental variables. The objective of the present work was to determine the espatio-temporal variation in the structure and composition of macroinvertebrates and their relationship with the environmental variables. Four sampling (April-June-September-November) were carried out throughout 2015, in four stations (Estuary River-Internal Estuary-External Estuary-Marine Estuary). At each station three samples of sediments, physicochemical variables of the water and macroinvertebrates were collected. A total of 532 individuals were found in 17 species and 9 families. The abundance varied from 0.7±1.2 to 29.7±7.4 individuals per trawl and the richness varied from 0.3±1.2 to 4.7±1.2 species per trawl. The multiple regression analysis suggests an influence of the variables salinity and percentage of clayson the structure and composition of macroinvertebrates in the bay. The abundance and richness of macroinvertebrates was higher when the salinity conditions prevailed in the estuary.

Effect of water quality variation on fish assemblages in an anthropogenically impacted tropical estuary, Colombian Pacific

“…In the studied site, it was recorded a temporal gradient in which salinity was the highest during the dry season, followed by the transitional and wet seasons, as well as a spatial gradient in which salinity was the lowest in the inner sites and highest in the outer sites. This pattern has been previously reported in studies in the same bay and was characterized by salinities below 26 PSU due to high rainfall and runoff from the Dagua and Anchicayá Rivers (Cantera et al 1999;Gamboa-García et al 2018aMolina et al 2020). Nitrate and nitrite concentrations were the highest during the transitional season and at the inner sites, whereas phosphate concentration was the highest during the wet season and at the inner sites.…”

“…In order to characterize the community structure, the captured fish were identified to the species level and counted, and their total length, standard length, and weight were measured. Fish identification was performed using published taxonomic keys (Fischer et al 1995a, b;Froese and Pauly 2017;Marceniuk et al 2017;Robertson and Allen 2015;Tavera et al 2018).…”

Influences of environmental conditions in the fish assemblage structure of a tropical estuary

“…The identification of fishes was determined by using the methods of Fischer et al (1995a, b), Nelson (2006), Marceniuk et al (2009Marceniuk et al ( , 2017, Robertson and Allen (2015), Froese and Pauly (2017), and Tavera et al (2018). Total length (L T ), standard length (L S ), and total weight (g) were measured for all fishes.…”

Hábitos tróficos del lenguado Citharicthys gilberti (Paralichthyidae) y su relación con las dinámica ambiental en la Bahía de Buenaventura, Pacífico colombiano

“…La importancia de los crustáceos como presa dominante en la dieta de C. gilberti podría estar relacionada con su abundancia en épocas y sitios determinados dentro de la bahía de Buenaventura. En este estuario se han encontrado dentro del grupo de crustáceos las familias Portunidae, Penaeidae y Squillidae como características del mismo y a Callinectes arcuatus como la especie más abundante (Gamboa et al, 2018). En el Pacífico colombiano, C. arcuatus constituye un recurso pesquero importante (Álvarez, 2015), es por ello que cabe mencionar que una afectación a la población de crustáceos en la bahía podría afectar la ecología de C. gilberti.…”

“…The importance of crustaceans as the dominant prey items of C. gilberti might be related to their abundance at particular times and at certain locations in Buenaventura Bay. Crustaceans from the families Portunidae, Penaeidae and Squillidae have been found to be characteristic of the estuary, Callinectes arcuatus being the most abundant (Gamboa et al, 2018). In the Colombian Pacific, C. arcuatus is an important fisheries resource (Álvarez, 2015).…”