Cascade of dams amplifies predation risks for rheophilic fish eggs
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60077344%3A_____%2F25%3A00647072" target="_blank" >RIV/60077344:_____/25:00647072 - isvavai.cz</a>
Alternative codes found
RIV/67985807:_____/25:00647072 RIV/60076658:12310/25:43910537
Result on the web
<a href="https://doi.org/10.1002/eco.70128" target="_blank" >https://doi.org/10.1002/eco.70128</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1002/eco.70128" target="_blank" >10.1002/eco.70128</a>
Alternative languages
Result language
angličtina
Original language name
Cascade of dams amplifies predation risks for rheophilic fish eggs
Original language description
Rheophilic fish populations are experiencing significant declines, primarily because of human-induced modifications of riverine ecosystems. River damming and associated habitat changes favour generalist fish species, potentially exacerbating the challenges faced by rheophilic species. In this study, we investigated the interaction between two fish species: the rheophilic asp (Leuciscus aspius., Linnaeus, 1758) and the generalist common bream (Abramis brama. Linnaeus, 1758), with a focus on the latter's predation on asp eggs. We hypothesized that habitat modifications-specifically, reduced water flow caused by high water level retention in downstream reservoir-directly influence the accessibility of asp spawning grounds. From 2018 to 2020, we monitored asp egg abundance at a fluvial spawning ground and used passive telemetry arrays to track common bream presence. Gut content analysis was used to confirm predation of asp eggs by common bream at the site. Our findings show that high water levels in 2018 and 2019, which slowed water flow, facilitated common bream access to the spawning ground. In contrast, the significantly lower water levels in 2020 increased water flow rates by two to three times, restricting common bream access. Statistical modelling revealed that river habitat modifications intensify interspecific interactions among fish species that would otherwise have minimal interactions in unaltered environments. These subtle yet significant shifts in trophic dynamics within anthropogenically altered riverine landscapes may contribute to the ongoing decline of rheophilic fish species.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10619 - Biodiversity conservation
Result continuities
Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Ecohydrology
ISSN
1936-0584
e-ISSN
1936-0592
Volume of the periodical
18
Issue of the periodical within the volume
7
Country of publishing house
US - UNITED STATES
Number of pages
11
Pages from-to
e70128
UT code for WoS article
001627006800015
EID of the result in the Scopus database
2-s2.0-105021616885