Influences of dispersal and local environmental factors on stream macroinvertebrate communities in Qinjiang River, Guangxi, China

Zhang, Yong; Zhang, Jie; Wang, Lizhu; Lu, Dongqi; Cai, Desuo; Wang, Beixin

doi:10.3354/ab00560

Cited by 19 publications

(8 citation statements)

References 37 publications

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“…In community ecology, whether terrestrial or marine, environmental drivers may act at multiple and nested spatio-temporal scales to shape communities. At global spatial scale, structural and functional connectivity is known to shape populations through, for example, migrations of adult individuals between remote localities or the dispersal of reproductive products 1 , 2 . At intermediate scale, the configuration of a stretch of coast and putative consequences for local ecosystem functioning may in addition shape assemblages (e.g.…”

Section: Introductionmentioning

confidence: 99%

Juvenile fish assemblages in temperate rocky reefs are shaped by the presence of macro-algae canopy and its three-dimensional structure

Cheminée

Pastor

Bianchimani³

et al. 2017

Sci Rep

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Arborescent macro-algae forests covering temperate rocky reefs are a known habitat for juvenile fishes. However, in the Mediterranean, these forests are undergoing severe transformations due to pressures from global change. In our study, juvenile fish assemblages differed between pristine arborescent forests (Cystoseira brachycarpa var. balearica) versus an alternate state: bushland (Dictyotales – Sphacelariales). Forests hosted richer and three-fold more abundant juvenile assemblages. This was consistent through space, whatever the local environmental conditions, along 40 km of NW Mediterranean subtidal rocky shores (Corsica, France). Among Cystoseira forests, juvenile assemblages varied through space (i.e. between localities, zones or sites) in terms of total abundance, composition, richness and taxa-specific patterns. More than half of this variability was explained by forest descriptors, namely small variations in canopy structure and/or depth. Our results provide essential cues for understanding and managing coastal habitats and fish populations. Further studies are needed to explain the residual part of the spatial variability of juvenile fish assemblages and to help focus conservation efforts.

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Section: Introductionmentioning

confidence: 99%

Juvenile fish assemblages in temperate rocky reefs are shaped by the presence of macro-algae canopy and its three-dimensional structure

Cheminée

Pastor

Bianchimani³

et al. 2017

Sci Rep

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“…invertebrate presence (Souto et al, 2011, Wynne and Linnane, 2009, Zhang et al, 2014. Based on the CCA results, the most favourable oxygen conditions during the whole period of study were observed at the first four sites of the watercourse, where the biodiversity reached the highest values.…”

Section: Taxamentioning

confidence: 97%

“…Among studies of macroinvertebrates in small streams, the most common topic has been the impact of environmental factors on the benthic structure (Souto et al, 2011;Zhang et al, 2014;Kakouei et al, 2017), as well the top-down and bottom-up relationships (Nyström et al, 2003).…”

Section: Introductionmentioning

confidence: 99%

Shaping of macroinvertebrate structures in a small fishless lowland stream exposed to anthropopressure, including the environmental conditions

Krepski¹,

Czerniawski²

2018

Knowl. Manag. Aquat. Ecosyst.

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-In studies of abiotic and biotic factors influencing macroinvertebrate assemblages, there is always the problem of which factor -fish predation or environmental conditions -has the strongest impact on the invertebrates and whether the impact is positive or negative. The aim of our study was to determine the impact on the structures of macrozoobenthos in a small field watercourse exerted by abiotic conditions, with the concurrent lack of predators and varied intensity of anthropopressure. During the entire study period, the presence of 49 taxa of macroinvertebrates was recorded. The highest number of taxa and value of biodiversity was observed in the upper part of the watercourse, and subsequently decreased down the stream, reaching the lowest value at the sites located near the outlet. The tributaries significantly differed between each other in the number of taxa. In the tributary carrying water from wetland, a much higher number of taxa was noted than in the tributary carrying municipal water where the density achieved a significantly higher value of individuals than the remaining sites. The most limiting factors for the abundance of the investigated taxa were the oxygen concentration, nutrients and ammonia.Keywords: Macroinvertebrates / small streams / environmental conditions / anthropopressure Résumé -Variations des structures des macroinvertébrés dans un petit cours d'eau de plaine sans poissons exposé à la pression anthropique influant les conditions environnementales. Dans les études sur les facteurs abiotiques et biotiques qui influencent les assemblages de macroinvertébrés, il y a toujours le problème de savoir quel facteur À prédation des poissons ou conditions environnementales À a l'impact le plus fort sur les invertébrés et si l'impact est positif ou négatif. Le but de notre étude était de déterminer l'impact, sur les structures du macrozoobenthos dans un petit cours d'eau de plaine, des conditions abiotiques, avec absence concomitante de prédateurs, et l'intensité variable de la pression anthropique. Pendant toute la période d'étude, la présence de 49 taxons de macroinvertébrés a été observée. Le nombre le plus élevé de taxons et la valeur de la biodiversité la plus élevée ont été observés dans la partie supérieure du cours d'eau et ont ensuite diminué le long du cours d'eau, pour atteindre la valeur la plus faible aux sites situés près de l'exutoire. Les affluents différaient considérablement les uns des autres quant au nombre de taxons. Dans l'affluent transportant l'eau d'une zone humide, on a observé un nombre beaucoup plus élevé de taxons que dans l'affluent transportant de l'eau domestique, où la densité a atteint une valeur significativement plus élevée d'individus que dans les autres sites. Les facteurs les plus limitants de l'abondance des taxons étudiés étaient la concentration d'oxygène, les nutriments et l'ammoniac.Mots-clés : Macroinvertébré / petits cours d'eau / conditions environnementales / pression anthropique

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“…However, the relative importance of dispersal versus local environmental factors differs among studies. Some authors found higher predictive power of local environmental factors (Zhang et al, 2014), whereas others found prevailing importance of dispersal over environment (Castillo-Escrivà et al, 2016). Liu et al (2013) suggested that in river benthic diatoms this relative im- portance of dispersal decreases if species are attached strongly to the substrate.…”

Section: Downstream Dispersal Structuring Communitiesmentioning

confidence: 99%

“…Therefore, the fraction of explained variation in community composition indeed reflects the importance of downstream-directed dispersal of mollusks. Several studies demonstrated the general importance of downstream-directed species dispersal on determining macroinvertebrate communities (Gray and Arnott, 2011;Funk et al, 2013;Zhang et al, 2014;Curry and Baird, 2015). However, the relative importance of dispersal versus local environmental factors differs among studies.…”

Section: Downstream Dispersal Structuring Communitiesmentioning

confidence: 99%

Mollusk communities of the central Congo River shaped by combined effects of barriers, environmental gradients, and species dispersal

et al. 2017

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Rapids, falls, and cascades might act as barriers for freshwater species, determining the species community up-and downstream of barriers. However, they affect community composition not only by acting as barriers but also by their influence on environmental gradients. Moreover, the directional dispersal of species along the watercourse might determine community composition. A suitable system to study these differential effects is the Congo River, the world's second largest river by discharge. The small 'Upper Congo Rapids' ecoregion features several rapids known as barrier for fish. The Wagenia Cataract at the town of Kisangani constitutes the strongest drop of the Congo River and several studies have emphasized its role as barrier for fish distribution. Alternative explanations for this pattern, however, are rarely evaluated. Though mollusks represent a vital component of the macrozoobenthos, with distribution patterns and underlying drivers often distinct from that of fishes, virtually no field surveys of the Congo River have been reported for decades. We collected and determined mollusks of 51 stations, recorded environmental conditions, and generated proxies for directional species dispersal and an indirect barrier effect. Those variables were subjected to distance-based redundancy analyses and variation partitioning in order to test whether the mollusk community compositions are better explained by an individual or combined influence of the direct and indirect effect of the cataract barrier, environmental conditions, and downstreamdirected dispersal. Our survey showed an exclusive upstream/downstream distribution for just four out of the 19 species, suggesting a limited barrier effect. We revealed no direct influence of the barrier itself on community composition but of substrate type. However, we found an indirect effect of the barrier through replacing spatially structured communities upstream of the cataract with more uniform ones downstream. Downstream-directed dispersal explained the highest fraction of variation in mollusk communities. Thus, environmental factors, the indirect cataract effect, and downstream-directed spatial proxies model mollusk community composition in concert. These results support previous studies showing a multi-factorial imprint on communities. However, a large fraction of variation community composition remained unexplained, potentially due to flood plain dynamics that (re-)shape mollusk communities constantly and a high temporal turnover, evidenced by the comparison with historical surveys. This is likely caused by the growth of Kisangani and resulting human activities. A monitoring system could allow better assessments of these impacts on communities and the conservation status of endemic species in the Wagenia Cataract.

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Influences of dispersal and local environmental factors on stream macroinvertebrate communities in Qinjiang River, Guangxi, China

Cited by 19 publications

References 37 publications

Juvenile fish assemblages in temperate rocky reefs are shaped by the presence of macro-algae canopy and its three-dimensional structure

Juvenile fish assemblages in temperate rocky reefs are shaped by the presence of macro-algae canopy and its three-dimensional structure

Shaping of macroinvertebrate structures in a small fishless lowland stream exposed to anthropopressure, including the environmental conditions

Mollusk communities of the central Congo River shaped by combined effects of barriers, environmental gradients, and species dispersal

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