Microhabitat interactions of non-native pumpkinseed<i>Lepomis gibbosus</i>in a Mediterranean-type stream suggest no evidence for impact on endemic fishes

Top, Nildeniz; Tarkan, Ali Serhan; Vilizzi, Lorenzo; Karakuş, Uğur

doi:10.1051/kmae/2016023

Cited by 11 publications

(14 citation statements)

References 35 publications

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“…This is likely due to the preference of L . gibbosus for similar habitat and water quality of the native species, that is, low turbidity, low depth, low flow, and mesotrophic conditions with a higher availability of diversified microhabitats (Top, Tarkan, Vilizzi, & Karakuş, ). Conversely, the high ranking of L .…”

Section: Discussionmentioning

confidence: 99%

“…Among exotic species potentially affecting native ones, L. gibbosus had the highest conditional and marginal effects and was positively related with the density of Anguilla anguilla. This is likely due to the preference of L. gibbosus for similar habitat and water quality of the native species, that is, low turbidity, low depth, low flow, and mesotrophic conditions with a higher availability of diversified microhabitats (Top, Tarkan, Vilizzi, & Karakuş, 2016). Conversely, the high ranking of L. aspius in the ordination graph is likely driven by its capture in only seven sites of the lower reach, where the native community was not significantly represented and other exotic species were also present.…”

Section: Discussionmentioning

confidence: 99%

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Exotic species, rather than low flow, negatively affect native fish in the Oglio River, Northern Italy

Gavioli

Mancini²,

Milardi

et al. 2018

River Research & Apps

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Rivers worldwide are impacted by human activities such as habitat degradation, habitat fragmentation, waterway flow regulation, and introduction of exotic species, which are responsible for the reduction or the disappearance of native species in many parts of the world. The Oglio River, a tributary of the Po River in Northern Italy, is a good example of a river with a long history of human alteration and where exotic invasions are present. We used data on water parameters and fish communities along the watercourse to investigate whether low flow conditions, degraded water quality, abundant exotic species, and the presence of migration barriers could be a disadvantage for native species. We used ordination methods (redundancy analysis), variance partitioning analysis, and the threshold indicator taxa analysis to explore changes in community composition and ecofunctional traits along an altitude gradient. We found that exotic species affected native ones more than water quality and hydromorphological parameters. Native species were most abundant in the upper reach of the Oglio River, despite low flow and shallow depth. Moreover, rheophilic and clear water native fish decreased rapidly in the lower reach of the river, where exotic species increased. This distribution could be explained by the presence of barriers in the middle reach, which block exotic species migrating upstream from the highly invaded Po River, and by a lower suitability of the upper reach for some exotic species. Our results provide a general description of the fish fauna of a strongly regulated river and can contribute to develop more effective fish and water management practices.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Exotic species, rather than low flow, negatively affect native fish in the Oglio River, Northern Italy

Gavioli

Mancini²,

Milardi

et al. 2018

River Research & Apps

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“…These results reflect the performance of CQO when combined with our novel approach to compute p ‐values. CQO has only rarely been used in ecological studies and mostly within fisheries research (Carosi, Ghetti, Porta, & Lorenzoni, ; Top, Tarkan, Vilizzi, & KarakuÅŸ, ; Vilizzi, Stakenas, & Copp, ). ter Braak and Šmilauer () suggest that this is due to limitations on the number of species that can be included, a steep learning curve, and numerical instability.…”

Section: Discussionmentioning

confidence: 99%

Should ecologists prefer model‐ over distance‐based multivariate methods?

Jupke

Schäfer

2020

Ecology and Evolution

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Ecological data sets often record the abundance of species, together with a set of explanatory variables. Multivariate statistical methods are optimal to analyze such data and are thus frequently used in ecology for exploration, visualization, and inference. Most approaches are based on pairwise distance matrices instead of the sites‐by‐species matrix, which stands in stark contrast to univariate statistics, where data models, assuming specific distributions, are the norm. However, through advances in statistical theory and computational power, models for multivariate data have gained traction. Systematic simulation‐based performance evaluations of these methods are important as guides for practitioners but still lacking. Here, we compare two model‐based methods, multivariate generalized linear models (MvGLMs) and constrained quadratic ordination (CQO), with two distance‐based methods, distance‐based redundancy analysis (dbRDA) and canonical correspondence analysis (CCA). We studied the performance of the methods to discriminate between causal variables and noise variables for 190 simulated data sets covering different sample sizes and data distributions. MvGLM and dbRDA differentiated accurately between causal and noise variables. The former had the lowest false‐positive rate (0.008), while the latter had the lowest false‐negative rate (0.027). CQO and CCA had the highest false‐negative rate (0.291) and false‐positive rate (0.256), respectively, where these error rates were typically high for data sets with linear responses. Our study shows that both model‐ and distance‐based methods have their place in the ecologist's statistical toolbox. MvGLM and dbRDA are reliable for analyzing species–environment relations, whereas both CQO and CCA exhibited considerable flaws, especially with linear environmental gradients.

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“…Fish-habitat relationships were analysed by Constrained Quadratic Ordination (CQO) (Yee, 2004). This method overcomes the unrealistic assumptions of equal tolerances, equal maxima and uniformly distributed optima and site scores over the range of the environmental gradient, unlike Canonical Correspondence Analysis (CCA) (Yee, 2004), and has been applied successfully to fish-habitat relationships studies (Vilizzi et al, 2012;Top et al, 2016). CQO estimates an optimal linear combination of the microhabitat variables and regresses the species' data upon the latent variable axis using a quadratic curve fitted across the species' scores.…”

Section: Discussionmentioning

confidence: 99%

“…Non-native species continue to be introduced outside of their natural range, resulting in their range expansion and the development of invasive populations that impact native biodiversity (Lockwood et al, 2007;Seebens et al, 2017). Integral to determining the ability of an introduced species to establish and develop invasive populations is their adaptation to the available foraging and spawning habitat in the introduced environment (Van Kessel et al, 2011;Top et al, 2016). Generalist species that have high plasticity in their habitat selectivity are often more successful invaders, as there are lower costs involved in their adaptation to the new environment (Gozlan et al, 2010;Davidson et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Plasticity in habitat use of two native Ponto-Caspian gobies, Proterorhinus semilunaris and Neogobius fluviatilis: implications for invasive populations

Top

Karakuş

Tepeköy

et al. 2019

Knowl. Manag. Aquat. Ecosyst.

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The Ponto-Caspian region is an important source area for some invasive gobiid fishes. These fishes have colonised several freshwater ecosystems in Europe, as well as in North America. As knowledge on their habitat utilisation in their native range remains limited, the seasonal habitat uses of Western tubenose goby, Proterorhinus semilunaris and monkey goby Neogobius fluviatilis were studied in four natural lakes in the Marmara Region (NW Turkey). Habitat use of both species was highly variable between the lakes and seasons, with P. semilunaris showing higher plasticity. In general, the main habitats used by P. semilunaris were shallow waters in littoral areas that had vegetation cover, whereas N. fluviatilis consistently used sandy substratum in deeper waters that lacked vegetation. These results suggested there was high plasticity in the habitat utilisation of these two gobiids, especially in P. semilunaris, which potentially facilitates their ability to establish and invade novel environments. The habitats that are especially vulnerable to P. semilunaris invasion are medium size substrates which provide individuals with sufficient interstitial space for refuge. Waters providing differing habitats, such as sandy substrata, might inhibit their colonisation, but are potentially more vulnerable to N. fluviatilis invasion.

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Microhabitat interactions of non-native pumpkinseedLepomis gibbosusin a Mediterranean-type stream suggest no evidence for impact on endemic fishes

Cited by 11 publications

References 35 publications

Exotic species, rather than low flow, negatively affect native fish in the Oglio River, Northern Italy

Exotic species, rather than low flow, negatively affect native fish in the Oglio River, Northern Italy

Should ecologists prefer model‐ over distance‐based multivariate methods?

Plasticity in habitat use of two native Ponto-Caspian gobies, Proterorhinus semilunaris and Neogobius fluviatilis: implications for invasive populations

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