Method-integrated fish assemblage structure at two spatial scales along a free-flowing stretch of the Austrian Danube

Loisl, Franz; Singer, Gabriel; Keckeis, Hubert

doi:10.1007/s10750-013-1588-4

Cited by 26 publications

(29 citation statements)

References 45 publications

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“…Here, we provided the first quantification of habitat suitability of these two species. Overall, these results correspond well with former, less detailed studies, which found that the round goby is abundant in the littoral zone of the Danube and occurs even in shallow (<2 m) areas, with medium velocity (0.3–0.6 ms −1 ) and gravel and stony substrate, whereas the Danube streber is extremely rare in the littoral zone and prefers the offshore, high velocity areas (Erős et al, ; Erős et al, ; Loisl, Singer, & Keckeis, ).…”

Section: Resultssupporting

confidence: 91%

Habitat mapping of riverine fish by means of hydromorphological tools

et al. 2018

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Hydromorphological features of rivers, such as flow depth, flow velocity, and the composition of bed material play a crucial role in the habitat selection of fish. Although these basic hydromorphological parameters can be determined with high spatial and temporal resolution using state‐of‐the‐art investigation methods, only few studies deal with the connection of habitat parameters and abundance of fishes (i.e., habitat modelling) in large rivers. The aim of this study is to fill this gap by introducing the so‐called habitat maps connecting the results of 3D hydrodynamic simulations and results of offshore fish ecological surveys. The steps of habitat modelling are introduced through the case study of the Danube River focusing on evaluating the habitat use and suitability of two fish species representative to this section of the river (i.e., the round goby Neogobius melanostomus and the Danube streber Zingel streber). A novel method for mapping the bed material composition, playing a crucial role in the habitat assessment, is also presented along the numerical modelling.

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Section: Resultssupporting

confidence: 91%

Habitat mapping of riverine fish by means of hydromorphological tools

et al. 2018

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“…Note that the y-axes are differently scaled adult abundances, point to either high mortality rates of young fish, or a lack of efficient sampling methods for adult stages of these genera. In contrast, the monotypic genus Perca showed comparably low drifting densities, but the perch (P. fluviatilis) is often the most abundant adult percid in the Danube and its backwaters (Schabuss & Reckendorfer, 2002;Loisl et al, 2013). This supports the suggestion of some authors that this species avoids drifting (Reichard et al, 2002b;Zitek et al, 2004b) but may likewise be because of a preference for backwaters, also for reproduction (Schabuss & Reckendorfer, 2002;Hohausova & Jurajda, 2005).…”

Section: Generalsupporting

confidence: 62%

“…The genera Zingel and Sander showed the highest DD among the Percidae but are generally only rarely caught as adults (Schabuss & Reckendorfer, 2002;Er} os et al, 2008;Keckeis, 2013;Loisl et al, 2013). Their high abundances as early life stages, but low .…”

Section: Generalmentioning

confidence: 99%

The drift of early life stages of Percidae and Gobiidae (Pisces: Teleostei) in a free-flowing section of the Austrian Danube

et al. 2016

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The drift of early development stages is an essential element of dispersal in many fish species. It is caused by a multitude of factors and is thus highly specific for each taxon and developmental stage. In this paper, we examined the drift of free embryos, larvae, and juveniles of percids and gobiids in a freeflowing stretch of the Austrian Danube. We assessed the drift density (DD) at different distances from the shore, described seasonal and diel patterns, and how size of drifting fish changed throughout the season. The seasonal patterns as well as the DDs were highly specific for each genus, while the diel patterns and changes in size of drifting fishes differed primarily at family level. In addition, we compared two opposed shorelines-a near-natural gravel bar and a rip-rap stabilized shore. The shores differed significantly and on both shores the DD of gobies was higher compared to percids. Among the Gobiidae, the invasive Neogobius species clearly dominated (99% of total gobiid catch) over the native tubenose goby Proterorhinus semilunaris. Percid DD was substantially higher on the near-natural shore, with Zingel and Sander as the most abundant genera.

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“…Difficulties in estimating community parameters, however, can change with network position. Sampling becomes more difficult with increasing stream size, and requires multiple collecting devices (Flotemersch et al 2011, Loisl et al 2014, Erős et al2016b). Overall, much higher sampling effort is needed for the same level of sample representativeness in the downstream sections of rivers, than in upstream areas (Fig.…”

Section: Patterns In Diversitymentioning

confidence: 99%

Scaling fish metacommunities in stream networks: synthesis and future research avenues

Erős

2017

Community Ecology

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Abstract:The metacommunity perspective has substantially advanced our understanding of how local (within community) and dispersal (between community) processes influence the assembly of communities. The increased recognition of dispersal processes makes it necessary to re-evaluate former views on community organization in different ecological systems and for specific organisms. Stream systems have long been considered from a linear perspective, in which local community organization was examined along the longitudinal profile, from source to mouth. However, the hierarchically branching (i.e. dendritic) structure of stream networks also significantly affects both local and regional scale community organization, which has just only recently been fully recognized by ecologists. In this review, I examine how the shift from a strictly linear to a dendritic network perspective influenced the thinking about the organization of fish metacommunities in stream networks. I argue that while longitudinal patterns in the structure of fish communities are relatively well known, knowledge is still limited about how the structure of the stream network ultimately affects the spatial and temporal dynamics of metacommunities. I suggest that scaling metapopulation models up to the metacommunity level can be useful to further our understanding of the spatial structure of metacommunities. However, this requires the delineation of local communities and the quantification of the contribution of dispersal to local community dynamics. Exploring patterns in diversity, spatial distribution and temporal dynamics of metacommunities is not easily feasible in continuous stream habitats, where some parts of the habitat network are exceptionally hard to sample representatively. Combination of detailed field studies with modelling of dispersal is necessary for a better understanding of metacommunity dynamics in stream networks. Since most metacommunity level processes are likely to happen at the stream network level, further research on the effects of stream network structure is needed. Overall, separation of the effect of dispersal processes from local scale community dynamics may yield a more mechanistic understanding of the assembly of fish communities in stream networks, which may also enhance the effectiveness of restoration efforts.

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Method-integrated fish assemblage structure at two spatial scales along a free-flowing stretch of the Austrian Danube

Cited by 26 publications

References 45 publications

Habitat mapping of riverine fish by means of hydromorphological tools

Habitat mapping of riverine fish by means of hydromorphological tools

The drift of early life stages of Percidae and Gobiidae (Pisces: Teleostei) in a free-flowing section of the Austrian Danube

Scaling fish metacommunities in stream networks: synthesis and future research avenues

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