Environmental and geographic distance determining fish assemblage similarity in a floodplain: role of flow and macrophyte presence

Granzotti, Rafaela Vendrametto; Tavares, Ragna Woeltje; Rodrigues, Amanda Cantarute; Lopes, Taise Miranda; Gomes, Luiz Carlos

doi:10.1007/s10641-019-00868-5

Cited by 4 publications

(2 citation statements)

References 54 publications

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“…In our study area, lentic and lotic environments differ in habitat structure not only in terms of water flow, but also in mean depth (i.e., greater in lotic than lentic habitats) and abundance of macrophytes (i.e., higher in lentic than lotic habitats). These local characteristics influence the relative abundance of species in each habitat type (Agostinho et al., 2004, 2007; Granzotti et al., 2019). Therefore, one could expect spatial synchrony to be higher between habitats of the same type than between different habitats.…”

Section: Methodsmentioning

confidence: 99%

Drivers and spatial patterns of population synchrony of fish species in a floodplain

2022

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Spatial synchrony is the correlation between the temporal dynamics of local populations. This pattern may be driven by spatially correlated environmental variation (i.e., Moran effect), dispersal and trophic interactions. Investigating geographic patterns of synchrony can help disentangle the relative importance of these drivers. Using fish abundance data from long‐term ecological research (17 years) in the Upper Paraná River floodplain, we studied the relative roles of dispersal distance, density dependence differences, and environmental synchrony in determining spatial synchrony of the most common species in this floodplain. We also investigated the geography of spatial synchrony by estimating modularity and site‐level contributions to synchrony and anti‐synchrony networks. We found positive spatial synchrony for most species, but levels were relatively low. For most species, our explanatory matrices were poorly related to spatial synchrony. We detected modular structures in some species networks, which reflected complex spatial patterns in synchrony. We also detected sites with high importance to spatial synchrony patterns that could be managed to increase metapopulation stability. The variable levels of spatial synchrony for fish species in the Upper Paraná River floodplain implies the need to monitor several sites to understand their dynamics in this region. Also, some migratory species of high importance to regional fisheries, such as Prochilodus lineatus, may deserve special monitoring attention due to the increased regional extinction risk associated with their high levels of spatial synchrony. Finally, we speculate that hydrological manipulation from upstream reservoirs should consider the timing of water releases to avoid spatially correlated population declines.

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Section: Methodsmentioning

confidence: 99%

Drivers and spatial patterns of population synchrony of fish species in a floodplain

2022

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“…In turn, it was shown (Górski et al, 2011) that when flooding is synchronized with an increase in temperature, the success of replenishment of populations of river fish species is enhanced, which is noted in our study as a highly dynamic decrease of the density of fish in the conjugated water bodies, which correlates with the main factors of the aquatic environment during the spring flood period -temperature and water level. The difference in the physical parameters of conjugated water bodies, including the hydrological regime (Vítek et al, 2012;Granzotti et al, 2019) formed on the intensity and direction of flow, the depth (Reinhold et al, 2016;Granzotti et al, 2019), flood levels (Espínola et al, 2016, Jin et al, 2019, temperatures, and the presence of macrophytes (Granzotti et al, 2019) are the determining factors for fish numbers, their distribution, species diversity and size structure (Górski et al, 2012;Vítek et al, 2012;Espínola et al, 2016;Reinhold et al, 2016). In our study, the maximum density of fish was observed in the hydrological complex high-turbulent water environment of the lotic part of the riverbed depression.…”

Section: Discussionmentioning

confidence: 48%

Effects of temperature and water levels on dynamics of density and structure of the fish population of the channel-floodplain complex of a large river in the period of spring floods

Chemagin¹

2019

Biosys. divers.

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The article discusses the features of the dynamic process of migration of ichthyofauna from wintering sites to the wetlands of a large boreal river for feeding and spawning. The influence of factors of temperature and water level on various groups of fish is estimated, and the role of water bodies of various types during fish migration in a flooded floodplain is also established. The research was performed during the spring flood in the floodplain-channel complex of the Irtysh River (Western Siberia, Russian Federation) in the water area of the conjugate water bodies: the lotic and lentic parts of the riverbed depression and the mouth of the tributary – transit section of the migration pathway of fish to the flooded floodplain. The research work was performed by “AsCor” – computerized hydroacoustic complex, hydroacoustic survey data were processed in the laboratory. The “AsCor” complex remotely performs taxonomic identification of abundant species of fish at the family level by groups (Cyprinidae, Percidae, Coregonidae–Esocidae, Acipenseridae–Lotidae). It was found that after the breakup of ice cover, maximum densities of fish were observed in the wintering sections – the initial location of the spring migration. During the 30-days observation period in the wintering sections and conjugate water bodies, the density of fish decreased from 4 to 13 times due to their migration to the floodplain. The response to a decrease in the overall density of fish in the year-round functioning lotic part of the riverbed depression to the influence of factors of water level and temperature regimes was >0.300 in general for ichthyofauna and for all groups of fish registered by hydroacoustic method (Cyprinidae, Percidae, Coregonidae–Esocidae, Acipenseridae–Lotidae). We constructed regression models of changes in the density of fish in the wintering sections of the river depending on the considered factors. Use of ANOVA analysis of variance confirmed the adequacy of the choice and the acceptability of the constructed models. We established a high statistically significant inverse correlation between the density of the fish, the water level and temperature regime for the mouth of the Konda River and the lentic part of the riverbed depression, which are transit sections of the migration pathway of fish in the floodplain. The lentic part of the riverbed depression may perform the function of a temporary station of fish during migration to the floodplain, which is beneficial from the point of view of bioenergetics resources. During the observation period, in the river flows there was a decrease in the proportion of larger fish and an increase in smaller individuals; in the lentic part of the riverbed depression, on the contrary, there was a reduced proportion of small fish and increase in the proportion of larger individuals.This pattern is explained by the reduced risk of predation by small fish in more turbulent conditions, as well as by an initial entry into the flooded floodplain of larger individuals of fish for spawning, followed by the smaller ones for feeding.

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Drivers of fish trophic guild composition in lakes of the Upper Paraná River floodplain

et al. 2022

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Environmental and geographic distance determining fish assemblage similarity in a floodplain: role of flow and macrophyte presence

Cited by 4 publications

References 54 publications

Drivers and spatial patterns of population synchrony of fish species in a floodplain

Drivers and spatial patterns of population synchrony of fish species in a floodplain

Effects of temperature and water levels on dynamics of density and structure of the fish population of the channel-floodplain complex of a large river in the period of spring floods

Drivers of fish trophic guild composition in lakes of the Upper Paraná River floodplain

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