Effects of seasonality and fish movement on tropical river food webs

Winemiller, Kirk O.; Jepsen, David B.

doi:10.1111/j.1095-8649.1998.tb01032.x

Cited by 387 publications

(261 citation statements)

References 79 publications

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“…The gradual drying of the floodplains increases fish densities and intensifies biotic interactions, mainly predation and competition, because habitat and food resources are declining. The fish that remain in the floodplain lakes during the dry seasons become stranded in isolated pools, where they compete for limited resources and are at risk of being preyed upon by predators, such as piscivorous fish, birds and other vertebrates (Winemiller & Jepsen 1998). By contrast, our hypothesis to explain the interaction effects could be associated with climatic events.…”

Section: Source Of Variationcontrasting

confidence: 47%

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

2015

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. 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.

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Section: Source Of Variationcontrasting

confidence: 47%

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

2015

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“…Além disso, o conhecimento da ecologia trófica de um determinado sistema é importante não só para se determinar os hábitos alimentares das espécies, mas para compreender as relações inter-específicas e inter-guildas (Elliott et al 2007). De acordo com Winemiller & Jepsen (1998) esses dados são a base para construção de teias alimentares e fornecem embasamento para trabalhos de manejo e conservação de ecossistemas.…”

Section: Introductionunclassified

“…Mudanças temporais na disponibilidade de alimento afetam as relações tróficas da comunidade (Winemiller & Jepsen 1998), pois alteram a composição qualitativa e quantitativa da oferta de recursos ao longo do ano.…”

Section: Introductionunclassified

Variação temporal e espacial na composição de guildas alimentares da ictiofauna em lagoas marginais do Rio Cuiabá, Pantanal Norte

2011

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Abstract:This study aimed to evaluate the spatial and temporal variation of the feeding guilds of fish communities of 10 oxbow lakes of the Cuiabá River in the Pantanal. The lagoons were sampled in three periods of the hydrological cycle (beginning and ending of the dry and flooding season of 2005). The feeding guilds were determined through analysis of stomach contents of the most abundant species in the community. Were analyzed 37 species belonging to eight trophic guilds (insectivore, herbivore, omnivore, zooplanktivore, planktivore, detritivore, benthivore and iliophage), whitch varied spatially and temporally. A change in the composition of trophic guilds between the periods and locations was observed, but the number of guilds did not vary for either of them. Our results suggest that spatial and temporal variation in the composition of the guilds can be related to many factors, such as alterations in the composition of the community where new species can contribute to the different trophic guilds; and the exploration of more abundant resources in certain periods of the year favoring the presence of some guilds only in some periods. Keywords: trophic groups, fishes, hydrological cycle, feeding ecology, community structure. Resumo: O presente trabalho teve como objetivo avaliar a variação espacial e temporal das guildas alimentares das comunidades de peixes em 10 lagoas marginais do Rio Cuiabá no Pantanal. As lagoas foram amostradas em três períodos do ciclo hidrológico (início e final da seca e início da enchente de 2005). As guildas alimentares foram determinadas através da análise do conteúdo estomacal das espécies mais abundantes da comunidade. Foram analisadas 37 espécies pertencentes a oito guildas alimentares (insetívora, herbívora, onívora, zooplanctívora, planctívora, detritívora, bentívora e iliófaga), as quais variaram espacial e temporalmente. Observamos uma mudança na composição das guildas tróficas entre os períodos e locais analisados, porém o número de guildas não variou espaço-temporalmente. Nossos resultados sugerem que as mudanças espaciais e temporais na composição das guildas podem estar relacionadas com diversos fatores, como as alterações na composição da comunidade onde novas espécies podem compor as diferentes guildas; a exploração de recursos mais abundantes em determinadas épocas do ano favorecendo a presença de algumas guildas somente em alguns períodos. Palavras-chave: grupos tróficos, peixes, ciclo hidrológico, ecologia alimentar, estrutura de comunidade.

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“…These two piranhas exhibited no changes in condition factors that could be attributed to the extreme drought that happened in 2005. Low water periods, if not extremely long, may favor this trophic level, since as water volume declines the relative density of potential prey increases, which increases the encounter rate between predators and their prey (Winemiller and Jepsen, 1998). This phenomenon acts as a buffer against loss of fitness because unlike the omnivores, their food source is still available to them.…”

Section: Discussionmentioning

confidence: 99%

Condition factor variations over time and trophic position among four species of Characidae from Amazonian floodplain lakes: effects of an anomalous drought

et al. 2017

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The effects of extreme droughts on freshwater fish remain unknown worldwide. In this paper, we estimated the condition factor, a measure of relative fitness based on the relationship of body weight to length, in four fish species representing two trophic levels (omnivores and piscivores) from Amazonian floodplain lakes for three consecutive years: 2004, 2005 (an anomalous drought year), and 2006. The two omnivores, Colossoma macropomum and Mylossoma duriventre, exhibited trends consistent with their life cycles in 2004 and 2006: high values during the hydrologic seasons of high water, receding water, and low water, with a drop following reproduction following the onset of rising water. However during the drought year of 2005 the condition factor was much lower than normal during receding and low water seasons, probably as a result of an abnormal reduction in resource availability in a reduced habitat. The two piscivorous piranhas, Serrasalmus spilopleura and S. elongatus, maintained relatively stable values of condition factor over the hydrologic cycles of all three years, with no apparent effect of the drought, probably because the reduction in habitat is counterbalanced by the resulting increase in relative prey density. We suggest that if predictions of increasing drought in the Amazon are correct, predatory species may benefit, at least in the short run, while omnivores may be negatively affected. Keywords

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Effects of seasonality and fish movement on tropical river food webs

Cited by 387 publications

References 79 publications

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

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

Variação temporal e espacial na composição de guildas alimentares da ictiofauna em lagoas marginais do Rio Cuiabá, Pantanal Norte

Condition factor variations over time and trophic position among four species of Characidae from Amazonian floodplain lakes: effects of an anomalous drought

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