Metacommunity organization in an intermittent river in Brazil: the importance of riverine networks for regional biodiversity

Rodrigues-Filho, Carlos A. S.; Gurgel-Lourenço, Ronaldo César; Ramos, Eliêta A.; Novaes, José Luís Costa; Garcez, Danielle Sequeira; Costa, Rodrigo Silva da; Sánchez-Botero, Jorge Iván

doi:10.1007/s10452-019-09732-1

Cited by 12 publications

(11 citation statements)

References 88 publications

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“…Estudos mais recentes acrescentaram outros elementos relacionados a ecomorfologia e dieta (Botero et al 2017), diversidade funcional (Rodrigues-Filho et al 2017 e 2018) e metacomunidades (Faustino e Terra 2019, Rodrigues-Filho et al 2019) (Figura 1). Entretanto, o maior desafio nos avanços desses estudos está no estabelecimento de referenciais teóricos que orientem as pesquisas, na busca por entender dinâmicas, padrões e processos.…”

Section: Estado Da Arte Dos Estudos Em Ecologia De Peixes De Riachos Intermitentes Da Região Semiárida Do Brasilunclassified

Ecologia De Peixes De Riachos Intermitentes

et al. 2021

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The ecology of fish from intermittent streams in the Brazilian semi-arid region is still little known. In the past twenty years, the number of researchers dedicated to this topic has increased considerably. However, significant gaps still exist when compared to the perennial streams of other regions of Brazil. Questions that address seasonal variations come up against the determination of capture methods and techniques that are efficient in the different phases of the hydrological cycle. In addition, techniques widely used in perennial systems, such as electrofishing, in most cases, have not been effective. Aspects related to biology, physiology, behavior, functional and taxonomic ecology of fish still need to be investigated taking into account seasonal and spatial scale variations. In view of the growing transformation imposed on the Brazilian semi-arid region by the extensive use of natural resources and by climate change, aquatic environments and their biodiversity are threatened by the transformation of riparian vegetation, the sewage release, the species introduction, the modification of its course and artificial perennialization. Thus, we will present and discuss, in this paper, the studies developed on the ecology of fish in the intermittent streams of the Brazilian semi-arid region and the gaps and challenges to be faced by future research.

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Section: Estado Da Arte Dos Estudos Em Ecologia De Peixes De Riachos Intermitentes Da Região Semiárida Do Brasilunclassified

Ecologia De Peixes De Riachos Intermitentes

et al. 2021

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“…Já o refinamento temático, refere-se, por exemplo, ao número de classes na legenda do mapeamento, sendo que alguns estudos utilizam poucas classes (agricultura, floresta, urbano e água), enquanto outros são mais refinados (até 19 classes, Souza et al 2020). Para paisagens fluviais, um refinamento temático importante é a discriminação entre riachos intermitentes ou perenes, relevante em regiões semi-áridas (Rodrigues-Filho et al 2020). O refinamento das classes de uso antrópico na bacia pode ser decisivo.…”

Section: Dados Geoespaciais Para Análise De Paisagens Fluviaisunclassified

Paisagens Fluviais E Peixes De Riacho: Uma Introdução Aos Dados, Unidades Espaciais De Análise E Classificação

Becker

Camana

2021

Oecol. Aust.

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Research on riverscapes and stream fish ecology has undergone a wide progress since the 1990s. Several conditions have been pointed out as essential in this progress, including the following four: (a) availability of geo-technology and spatial data, (b) setting the regional context of study areas (biomes, large river basins, ecoregions); (c) defining hierarchical spatial units of analysis (watersheds, segments, reaches) and their attributes (e.g., area, slope, order, perennial/intermittent), and (d) classification of spatial units according to their attributes. Here we present an introduction to these topics, using examples from studies in Brazilian streams, where research progress on riverscapes and stream fish has occurred only more recently. We identify a few challenges in the Brazilian context, including the standardization and consolidation of regional and national spatial databases that support riverscape analyses, training fish ecologists in Geographic Information Systems (GIS) and spatial data, expanding the use of classification systems in different spatial coverages and resolutions, research on structural, spatial and temporal attributes of spatial units in riverscape analyses

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“…In aquatic systems, species distribution is strongly influenced by physical variables that characterize different types of habitats and hydrological regime that determine which species are prone to local coexist based on their functional traits (Manna et al, 2017;Manna et al, 2019;Rodrigues-Filho et al, 2020), especially for aquatic organisms such as fish that have an exclusively aquatic life cycle. The variability in local habitat conditions is striking drastic in intermittent rivers, and ephemeral streams (IRES), where streamflow ceases partially or completely at some point along their course (Datry et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

“…Specifically, small stream-lined fish species with high fecundity and short reproductivity cycles can grow fast during dry phases under favorable temporary conditions reaching larger population density and body size by the end of floods with greater chances of survival and dispersal under drought environmental conditions (Junk et al, 1989;Pease et al, 2012). Indeed, fish species tend to present specialized strategies to survive in dry phases, such as high trophic variability (characin species; Manna et al, 2019) and high fertility (killifishes; Rodrigues-Filho et al, 2020). On the other hand, in wet phases the local sites become connected and thereby allow species dispersal among them (Medeiros and Maltchik, 2001).…”

Section: Introductionmentioning

confidence: 99%

Effect of drying dynamics on the functional structure of a fish assemblage from an intermittent river network

Gonçalves-Silva

Manna²,

Rodrigues-Filho³

et al. 2022

Front. Environ. Sci.

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We are living in a fast-changing world promoted by anthropogenic actions and ecosystems’ functioning has been constantly changed. One example is the globally reduction of river flow that can lead to more than 50% of the rivers and streams around the world becoming intermittent. However, the relationship between environmental changes and biological communities has been limited to taxonomic approach, rather than the functional approach. Functional structure determines how individuals interact with the environment and evaluating the effects of hydrological changes in functional variation can elucidate the responses of aquatic biota under climate changes. Thus, we hypothesized that hydrological phases (dry, re-wetting and wet) would influence both environmental conditions and fish composition (i.e., taxonomic richness and functional structure) in one intermittent river. In addition, we expected that: 1) fish assemblages will have higher values of species richness and Functional Diversity indexes—Richness (FRic), Dispersion (FDis), Specialization (FSpe), and Originality (FOri) in drier phases (dry and re-wetting); and 2) higher values of Functional Diversity indexes related to evenness (FEve) and divergence (FDiv) in the wet phase, due to the predominance of species with high dispersal capacity when sites are connected. Sampling was conducted in the Cruxati river during the three hydrological phases along four sites (250 m each). Functional diversity analysis, involving traits of dispersion, life history and trophic ecology were used to apply Functional Diversity indexes. Indexes were compared from null models and all species were ordered in a multidimensional functional space using principal coordinate analysis (PCoA). In the dry phase, taxonomic richness and FRic between communities is higher, as well as FSpe and FOri, showing that each assemblage has unique characteristics with different strategies allowing the establishment in this hydrological phase. However, communities are less functionally dispersed. In the wet phase, when the river is connected, FDis between communities is higher and species abundances are more equitable with regular distribution in the functional space. Therefore, we conclude that local ecological processes (i.e., dynamics of hydrology) may promote the establishment of species according to their functional traits and thereby the functional structure of local assemblages.

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Metacommunity organization in an intermittent river in Brazil: the importance of riverine networks for regional biodiversity

Cited by 12 publications

References 88 publications

Ecologia De Peixes De Riachos Intermitentes

Ecologia De Peixes De Riachos Intermitentes

Paisagens Fluviais E Peixes De Riacho: Uma Introdução Aos Dados, Unidades Espaciais De Análise E Classificação

Effect of drying dynamics on the functional structure of a fish assemblage from an intermittent river network

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