Fish scale stable isotopes as potential indicators of nutrient pollution: Exploring the response of roachi (Rutilus/ii rutilus)/i scale d15N and d13C to a gradient of land use disturbance

0583809 - BC 2024 RIV NL eng J - Článek v odborném periodiku
Vašek, Mojmír - Brabec, Marek - Blabolil, Petr - Čech, Martin - Draštík, Vladislav - Jůza, Tomáš - Kubečka, Jan - Muška, Milan - Peterka, Jiří - Prchalová, Marie - Říha, Milan - Hejzlar, Josef
Fish scale stable isotopes as potential indicators of nutrient pollution: Exploring the response of roachi (Rutilus/ii rutilus)/i scale d15N and d13C to a gradient of land use disturbance.
Science of the Total Environment. Roč. 865, Dec (2023), č. článku 161198. ISSN 0048-9697. E-ISSN 1879-1026
Grant CEP: GA ČR(CZ) GA20-18005S
Grant ostatní: AV ČR(CZ) StrategieAV21/20
Program: StrategieAV
Institucionální podpora: RVO:60077344 ; RVO:67985807
Klíčová slova: pelagic food webs * ecological status * whitefish scales * trophic position * delta-n-15 * delta-c-13
Obor OECD: Biodiversity conservation; Statistics and probability (UIVT-O)
Impakt faktor: 9.8, rok: 2022
Způsob publikování: Omezený přístup
https://doi.org/10.1016/j.scitotenv.2022.161198

To examine the suitability of fish scales as potential tracers of nutrient pollution, we analysed the nitrogen and carbon sta-ble isotope values (d15N and d13C) in scales of a generalist fish species, roach Rutilus rutilus, collected from 22 Czech res-ervoirs covering wide gradients of catchment land use and nutrient enrichment. Using generalised additive mixed models in the first step and generalised linear mixed models in the second step, we evaluated the response of roach scale stable isotope values to catchment land use variables (percentage of agricultural land and human population density) and in-reservoir water quality variables. Roach scale d15N values varied by 15 %o among the reservoirs and were strongly, line-arly, and positively associated with the percentage of agricultural land in the reservoir catchments, pointing to agriculture as the dominant source of nitrogen pollution in the investigated systems. Roach scale d13C values differed by d%o among the studied reservoirs and were not related to catchment land use variables or in-reservoir primary production (chloro-phyll-a levels). Possible variation in roach foraging strategies (littoral versus pelagic) between reservoirs or the contrasting effects of eutrophication-related autotrophic and heterotrophic processes on baseline d13C values may explain the lack of relationships between roach scale d13C values and the explanatory variables. In summary, our findings show that fish scale d15N values are sensitive bioindicators of catchment-derived anthropogenic nitrogen inputs to freshwater ecosystems. Because scales can be sampled in a nonlethal way and d15N analysis is relatively inexpensive, we suggest that measuring the d15N values of fish scales could be an effective method for monitoring nitrogen pollution in aquatic environments.
Trvalý link: https://hdl.handle.net/11104/0351808