Linking fish colonization rates and water level change in littoral habitats of a Venezuelan floodplain river

Layman, Craig A.; Montaña, Carmen G.; Allgeier, Jacob E.

doi:10.1007/s10452-009-9256-5

Cited by 14 publications

(14 citation statements)

References 24 publications

(31 reference statements)

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“…At both extreme of the gradient, communities are therefore more homogeneous which can be explained by the dominance of large scale processes [28]. For instance, water level reduction has been shown to influence community assemblage by influencing local individual abundances and by making it possible for species to colonize new local habitat patches [33], a process that can lead to community homogenization. Likewise, when the water level is very high, the presence of migratory species, dispersing over large distances, may homogenize fish communities.…”

Section: Discussionmentioning

confidence: 99%

Spatio-temporal variation of fish taxonomic composition in a South-East Asian flood-pulse system

et al. 2017

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The Tonle Sap Lake (TSL) is a flood-pulse system. It is the largest natural lake in South-East Asia and constitutes one of the largest fisheries over the world, supporting the livelihood of million peoples. Nonetheless, the Mekong River Basin is changing rapidly due to accelerating water infrastructure development (hydropower, irrigation, flood control, and water supply) and climate change, bringing considerable modifications to the annual flood-pulse of the TSL. Such modifications are expected to have strong impacts on fish biodiversity and abundance. This paper aims to characterize the spatio-temporal variations of fish taxonomic composition and to highlights the underlying determinants of these variations. For this purpose, we used data collected from a community catch monitoring program conducted at six sites during 141 weeks, covering two full hydrological cycles. For each week, we estimated beta diversity as the total variance of the site-by-species community matrix and partitioned it into Local Contribution to Beta Diversity (LCBD) and Species Contribution to Beta Diversity (SCBD). We then performed multiple linear regressions to determine whether species richness, species abundances and water level explained the temporal variation in the contribution of site and species to beta diversity. Our results indicate strong temporal variation of beta diversity due to differential contributions of sites and species to the spatial variation of fish taxonomic composition. We further found that the direction, the shape and the relative effect of species richness, abundances and water level on temporal variation in LCBD and SCBD values greatly varied among sites, thus suggesting spatial variation in the processes leading to temporal variation in community composition. Overall, our results suggest that fish taxonomic composition is not homogeneously distributed over space and time and is likely to be impacted in the future if the flood-pulse dynamic of the system is altered by human activities.

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Section: Discussionmentioning

confidence: 99%

Spatio-temporal variation of fish taxonomic composition in a South-East Asian flood-pulse system

et al. 2017

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“…Different metacommunity structures can emerge from the relationship between species distributions and environmental gradients (Presley et al 2010) and in this study we showed that metacommunity structure may also change over time due to structural changes in their landscapes. Moreover, these structural changes can be related to predictable ecological processes related to the flood regime in this system, which directly affects the degree of environmental heterogeneity and landscape connectivity (Layman et al 2010). The floodplain fish metacommunity went from nested to quasi‐nested in the beginning of the wet season up to quasi‐Clementsian during the peak of the flood.…”

Section: Discussionmentioning

confidence: 99%

“…During the beginning of the season, the landscape has a considerable degree of heterogeneity because each temporary habitat patch presents particular physicochemical characteristics, low connectivity and distinct biota that are recruited from nearby permanent ponds (Layman et al 2010). Later in the flooding period, the ephemeral habitats become much more connected between them and with permanent waterbodies as well.…”

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confidence: 99%

“…Later in the flooding period, the ephemeral habitats become much more connected between them and with permanent waterbodies as well. Consequently, the among‐ habitat variability in limnological characteristics and dispersal limitation are reduced (Thomaz et al 2007, Layman et al 2010). In this study we set out to evaluate and quantify the structural changes in a floodplain‐fish metacommunity throughout the wet season using the EMS approach (Presley et al 2010, Henriques‐Silva et al 2013).…”

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confidence: 99%

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Spatiotemporal dynamics in a seasonal metacommunity structure is predictable: the case of floodplain‐fish communities

Fernandes¹,

Henriques‐Silva²,

Penha³

et al. 2013

Ecography

165

180

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The metacommunity framework has greatly advanced our understanding about the importance of local and regional processes structuring ecological communities. However, information on how metacommunity structure and the relative strengths of their underlying mechanisms change through time is largely lacking. Dynamic systems that undergo environmental temporal changes and disturbances, such as floodplains, serve as natural laboratories to explore how their metacommunity structure change in time. Here we applied the Elements of Metacommunity Structure framework and variation partitioning analysis to assess how temporal changes in the local environmental factors and regional dispersal processes in the rain season influence a seasonal floodplain‐fish metacommunity. Across four months, relevant environmental factors were measured across 21 patches where over 3500 individual fish were sampled. Connectivity was measured using landscape resistance‐based metrics and additional spatial variation in metacommunity structure was assessed via spatial autocorrelation functions. The metacommunity structure changed from nestedness, at the beginning of the flood season, to a quasi‐Clementsian gradient at the end. Our analyses show that connectivity is only important in the beginning of the flood season whereas environment is only important at the end. These results suggest that this metacommunity is structured by changes between dispersal limitation and environmental filtering through time.

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“…Fish diversity (>300 species) is high, and fishes display a wide range of ecological attributes and life history strategies . These two rivers are characterized by a strongly seasonal hydrology with water levels typically fluctuating >5 m during an annual hydrological cycle (Arrington & Winemiller,2006;Layman et al, 2010). The Ventuari River is a tributary of the Orinoco River in Venezuela's Amazonas State characterized by clear water, low pH, and high fish diversity (> 400 fish species, Montaña et al, 2005).…”

Section: Study Sitementioning

confidence: 99%

Gape size influences seasonal patterns of piscivore diets in three Neotropical rivers

2011

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We examined diets of four piscivores, two in the order Perciformes (Cichla temensis and C. orinocensis) and two in the order Characiformes (Boulengerella cuvieri and B. lucius), from the Cinaruco, La Guardia, and Ventuari rivers in Venezuela throughout the wet-dry seasonal cycle. The four piscivores consumed a phylogenetically and morphologically diverse group of fishes, reflecting the overall diversity of fish species in these rivers. At the start of the falling-water period, Cichla consumed large prey, especially the abundant, migratory, fish of the genus Semaprochilodus. As these relatively large prey became depleted during the dry season, Cichla tended to consume smaller prey. For Boulengerella, gape limitation precluded consumption of larger, seasonally abundant, fishes, and so prey sizes were more consistent throughout the seasonal cycle. Our findings show how prey abundance and gape limitations interact to influence seasonal patterns of predator-prey interactions.Foram examinadas as dietas de quatro espécies de peixes piscívoros, duas da ordem Perciformes (Cichla temensis and C. orinocensis) e duas da ordem Characiformes (Boulengerella cuvieri and B. lucius), coletadas durante os ciclos de cheia e seca nos rios Cinaruco, La Guardia e Ventari, Venezuela. Os quatro piscívoros consumiram grupos de peixes filogenética e morfologicamente diversos, o que reflete a ampla diversidade de peixes nos rios estudados. No início da vazante, Cichla consumiu presas grandes, especialmente Semaprochilodus, um peixe migrador muito abundante. Com a diminuição das presas maiores durante a estação seca, Cichla tendeu a se alimentar de presas menores. Para Boulengerella, a limitação da abertura bucal impediu o consumo de peixes grandes e sazonalmente abundantes e, deste modo, o tamanho de suas presas foi menos variável ao longo do ciclo sazonal. Nossos resultados mostram como a abundância das presas e a limitação na abertura bucal interagem, influenciando os padrões de interação predador-presa.

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Linking fish colonization rates and water level change in littoral habitats of a Venezuelan floodplain river

Cited by 14 publications

References 24 publications

Spatio-temporal variation of fish taxonomic composition in a South-East Asian flood-pulse system

Spatio-temporal variation of fish taxonomic composition in a South-East Asian flood-pulse system

Spatiotemporal dynamics in a seasonal metacommunity structure is predictable: the case of floodplain‐fish communities

Gape size influences seasonal patterns of piscivore diets in three Neotropical rivers

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