Spatial synchrony of a highly endemic fish Assemblage (Segredo Reservoir, Iguaçu River, Paraná State, Brazil)

Domingues, Wladimir Marques; Bini, Luis Maurício; Agostinho, Ângelo Antônio

doi:10.1590/s1519-69842005000300009

Cited by 3 publications

(4 citation statements)

References 27 publications

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“…Our findings reveal that population dynamics of fish species in the Upper Paraná River floodplain range from independent to synchronous. Despite these variable levels of spatial synchrony, the predominance of synchronous dynamics is in line with other studies on fish populations (Bunnell et al., 2010; Domingues et al., 2005; Larios‐López et al., 2020; Ruetz et al., 2005; Stowe et al., 2020; Tedesco et al., 2004). Also, spatial synchrony was high for P. lineatus , an economically and ecologically important species (Agostinho et al., 2007).…”

Section: Discussionsupporting

confidence: 87%

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: Discussionsupporting

confidence: 87%

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

2022

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“…Similar results were found for freshwater fish species in other aquatic ecosystems (e.g. r ranging from −0.01 to 0.31 in a reservoir, Domingues et al, 2005; from −0.03 to 0.17 in European streams, Chevalier et al, 2014; from 0.01 to 0.57 in floodplain lakes, Granzotti et 2022; from 0.14 to 0.44 in wetlands, Ruetz et al, 2005). Low levels of spatial synchrony may indicate that local processes (e.g.…”

Section: Mean Spatial Synchrony Of Speciessupporting

confidence: 86%

“…Spatial synchrony studies with multiple species have shown that there can be a large interspecific variation in the level of synchrony (Anderson et al, 2018; Burrows et al, 2002; Domingues et al, 2005; Jones et al, 2007). This interspecific variation could be attributed to species‐specific characteristics (Pandit et al, 2013; Ruetz et al, 2005; Vindstad et al, 2019), suggesting that functionally similar species may have similar levels of spatial synchrony.…”

Section: Introductionmentioning

confidence: 99%

Interspecific variation in fish spatial synchrony relates to reproductive traits in a highly fragmented river

et al. 2022

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Spatial synchrony occurs when the abundance of populations in different locations rise and fall together. This pattern is caused mainly by dispersal and spatially correlated environmental stochasticity. The levels of spatial synchrony can vary between species, yet little is known about which species traits can explain this interspecific variation. In addition, traits may have different degrees of influence on spatial synchrony levels because of their differences in plasticity. We hypothesized that conservative traits—reproductive and morphological—will best explain interspecific variation in synchrony, while those that may vary according to the environment—feeding and habitat preference—will be weakly related to this interspecific variation. We evaluated the spatial synchrony of freshwater fish species in a highly fragmented river in the Neotropical region and related the levels of synchrony to seven predictors: diet, reproductive traits (migration, fecundation, parental care and spawning), position in the water column, niche breadth, body size, body shape and average temporal occurrence of each species. The fish species showed low levels of spatial synchrony but a high interspecific variation (correlation values ranging from −0.11 to 0.41). We found that this variation was mainly related to species' reproductive traits, that is, sedentary species with partial spawning and without parental care had higher mean spatial synchrony than species with the opposite characteristics. In contrast, more plastic traits (diet and habitat preferences) were poor predictors of mean spatial synchrony. We speculate that, despite the low spatial synchrony found, if extreme impacts continue to occur in the basin at the regional scale, it may negatively affect local fish populations in a synchronous manner, resulting in increased risk of simultaneous declines.

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“…However, both intraclass correlation coefficients for nearby environments associated with the same river, as well as the Mantel statistic, suggest that proximity did not influence the abundance fluctuation patterns of these organisms. However, for some species of insects (HANSKI and WOIWOD, 1993), birds (RANTA et al, 1995), and fish (DOMINGUES et al, 2005) spatial synchrony significantly decreased as the distance between locations increased.…”

Section: Discussionmentioning

confidence: 97%

Fluctuations of Testate Amoebae Populations (Rhizopoda) in Plankton from Different Environments on the Upper Paraná River Floodplain, Brazil

Alves

Lansac‐Tôha

Takahashi

et al. 2008

International Review of Hydrobiology

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Fluctuations in temporal and spatial abundance are remarkable features of all animal populations. Regional synchrony of local population dynamics has been verified in several studies. This study investigated the existence of coherent patterns in temporal fluctuations of the principal testate amoebae population abundance in plankton from the upper Paraná river floodplain in Brazil. Testate amoebae sampling was carried out every three months, from February 2000 to November 2002, and twice in 2003. Sampling occurred in 12 environments associated with three different rivers. Samples were obtained at the subsurface of the pelagic region, using a motorized pump and a 68 µm mesh plankton net. Ninety-three testate amoebae species from eight families were identified. The families Difflugiidae, Arcellidae, and Centropyxidae had the greatest number of species. Arcella conica, A. discoides, A. vulgaris, Centropyxis aculeata, C. ecornis, Difflugia gramen, D. pseudogramen and Cucurbitella dentata were the most abundant species, and they were chosen for spatial synchrony analysis. No coherent pattern of abundance fluctuation was found, in any of the floodplain environments studied. Nevertheless, when analyzing only the channels, spatial synchrony was observed to Centropyxis ecornis. Mantel tests showed that the synchrony level, as identified by Spearman and Pearson correlations, was not correlated to geographic distance between environments. We conclude that regional factors in the Upper Paraná River floodplain are not the main determinants of the population dynamics of testate amoebae. The high floodplain heterogeneity seems determine a great relevance of local factors.

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Spatial synchrony of a highly endemic fish Assemblage (Segredo Reservoir, Iguaçu River, Paraná State, Brazil)

Cited by 3 publications

References 27 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

Interspecific variation in fish spatial synchrony relates to reproductive traits in a highly fragmented river

Fluctuations of Testate Amoebae Populations (Rhizopoda) in Plankton from Different Environments on the Upper Paraná River Floodplain, Brazil

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