How does a reservoir affect the fish assemblage structure in a Mediterranean River (Turkey)?

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dc.authoridmestav, burcu/0000-0003-0864-5279
dc.authoridYalcin Ozdilek, Sukran/0000-0001-8264-7606
dc.authoridPartal, Nurbanu/0000-0001-7203-8129
dc.contributor.authorYalçın Özdilek, Şükran
dc.contributor.authorPartal, Nurbanu
dc.contributor.authorMestav, Burcu
dc.date.accessioned2025-01-27T20:17:14Z
dc.date.available2025-01-27T20:17:14Z
dc.date.issued2022
dc.departmentÇanakkale Onsekiz Mart Üniversitesi
dc.description.abstractMost rivers around the Mediterranean region, regardless of size, are interrupted by human induced barriers. Although various studies have been conducted to investigate the impacts of reservoirs on undisrupted freshwater biota, what kind of effects they exert on the distribution of freshwater fish assemblages with respect to the presence of invasive species remains to be answered. To attend to this research need, the Karamenderes River, which is disrupted by the Bayramic Reservoir, was selected as the research site. Relying on the river continuum concept (RCC), we hypothesized that fish assemblages in a given river would demonstrate a gradual downstream change unless the river is interrupted by any reservoir. The ad hoc unweighted pair group method with arithmetic means (UPGMA) agglomerative hierarchical cluster analyses revealed 11 fish assemblages 100 km down the studied river, which is characterized by four environmental gradients. Besides, co-occurrence network analyses were performed to gain a better understanding of the constructs of the observed fish assemblages. The analyses yielded two distinct clusters along the river and showed that the Bayramic Reservoir had no decisive part in the spatial clustering of these fish assemblages. The migratory species Anguilla anguilla was found only in and around the river mouth area. The co-occurrence network analyses indicated that the freshwater, estuarine and introduced species were observable in distinct groups. It is notable that the non-native Cyprinus carpio and invasive Carassius gibelio were determined in the native freshwater fish species module. The research evidenced that the reservoir had a triple effect, that is, a migration barrier to migratory fish species, a donor facilitating invasion, and a cause of homogenization of river fish assemblages along the river. The results suggest that the impact of the reservoir should be assessed in view of multiple nested model and fish passageways and controlling invasive species are two contradictory problems as far as the impacts of reservoirs are concerned. Therefore, river management should be performed in a way to allow the native migratory species to migrate freely while preventing the introduced species from moving upstream or downstream to preserve and promote rivers' heterogeneity.
dc.description.sponsorshipCOMU-BAP [FDK-2018-1433]; Turkiye Bilimsel ve Teknolojik Arastirma Kurumu [111Y286]
dc.description.sponsorshipCOMU-BAP, Grant/Award Number: Project number: FDK-2018-1433; Turkiye Bilimsel ve Teknolojik Arastirma Kurumu, Grant/Award Number: Project number: 111Y286
dc.identifier.doi10.1002/rra.4013
dc.identifier.endpage1346
dc.identifier.issn1535-1459
dc.identifier.issn1535-1467
dc.identifier.issue7
dc.identifier.scopus2-s2.0-85132407691
dc.identifier.scopusqualityQ2
dc.identifier.startpage1333
dc.identifier.urihttps://doi.org/10.1002/rra.4013
dc.identifier.urihttps://hdl.handle.net/20.500.12428/21523
dc.identifier.volume38
dc.identifier.wosWOS:000814817000001
dc.identifier.wosqualityQ3
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.language.isoen
dc.publisherWiley
dc.relation.ispartofRiver Research and Applications
dc.relation.publicationcategoryinfo:eu-repo/semantics/openAccess
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.snmzKA_WoS_20250125
dc.subjectBayramic Reservoir
dc.subjectco-occurrence network
dc.subjectfish clustering
dc.subjectinvasive species
dc.subjectriver continuum
dc.titleHow does a reservoir affect the fish assemblage structure in a Mediterranean River (Turkey)?
dc.typeArticle

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