Intra- and inter-annual changes in the condition factors of three Curimatidae detritivores from Amazonian floodplain lakes

Abstract

. Intra-and inter-annual changes in the condition factors of three Curimatidae detritivores from Amazonian floodplain lakes. Biota Neotropica. 15(4):http://dx.doi.org/10.1590/1676-0611-BN-2014-0001Abstract: The flood pulse is a key factor that drives the biota of large rivers with adjacent floodplains, but the direction and intensity of its effects are not uniform for all trophic guilds of fish. In this study, we tested the existence of intra-and inter-annual changes in the relative condition factors (kn) of three Curimatidae: Potamorhina altamazonica, Potamorhina latior, and Psectrogaster rutiloides. We used weight and length data from fish that were caught in eight floodplain lakes of the Rio Solimões. These data were from experimental fisheries during each season of the hydrological cycle: flooding, flood, drying, and dry from 2004, 2005, and 2006. In general, there are similar patterns of intra-annual changes for these three species, with the highest estimates of kn during high water conditions. The lowest values were observed during the drying and dry seasons of 2005, when an extreme drought occurred in the Amazon basin. Higher values were observed during the same seasons in the year post-drought. We hypothesized that these patterns would be explained by the biological characteristics of these species and the effects of intra-annual hydrological changes, mainly the flood pulse effect, and by inter-annual climatic events, which are determined by global climate phenomena. Keywords: Weight-length relationship, Curimatidae, environmental effects, relative condition factor, floodplain lakes.CORREIA, G.B., SIQUEIRA-SOUZA, F.K., FREITAS, C.E.C. Variac¸ão intra e interanual do fator de condic¸ão de três espécies detritívoras de Curimatidae em lagos de várzea da Amazônia. Biota Neotropica.15(4): http://dx.doi.org/10.1590/1676-0611-BN-2014-0001Resumo: O pulso de inundac¸ão é considerado um fator chave no direcionamento da biota de grandes rios associados a área de várzea, mas a direc¸ão e intensidade dos efeitos do pulso de inundac¸ão não são uniformes para todas as guildas tróficas dos peixes. Neste estudo, nós testamos a existência de mudanc¸as intra e interanuais no fator de condic¸ão (Kn) de três curimatideos: Potamorhina altamazonica, Potamorhina latior e Psectrogaster rutiloides.

Simultaneous abrupt shifts in hydrology and fish assemblage structure in a floodplain lake in the central Amazon

“…Only a few studies have examined impacts of recent climatic change on aquatic ecology in the Amazon, and these have analyzed responses to drought over relatively short time intervals1819. The Amazon has the most diverse freshwater fish fauna on Earth20, with the highest functional diversity21.…”

Length-weight relationships of six fish species from São Marcos Bay, Northeastern Brazil

“…This is because the LWR estimates were based on data of similar body shape taxon (Froese et al, ). Furthermore, many factors can influence these values including sex, sexual maturity, environmental conditions, food availability, geographic region and climatic changes (Correia, Siqueira‐Souza, & Freitas, ; Freitas, Almeida, Montag, & Rocha, ; Froese, ; Hossain et al, ).…”

Capítulo 23: Impactos de la deforestación y el cambio climático sobre la biodiversidad, los procesos ecológicos y la adaptación ambiental

“…Such extreme events affect plants and animals, causing changes at multiple levels, from individuals and populations to communities and ecosystems, at local and regional scales. In central Amazon's floodplains, the extreme drought event of 2005 affected detritivore curimatids' health (branquinhas), leading to thinner fish relative to their body length (Correia et al 2015). It also caused shifts in fish abundance and the composition of fish communities, which were noticeable a decade later (Röpke et al 2017).…”