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Deciphering the carbon and nitrogen cycling in selected tropical coastal fish: revelations from stable isotope fluctuations and feeding patterns: revelations from stable isotope fluctuations and feeding patterns

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Název: Deciphering the carbon and nitrogen cycling in selected tropical coastal fish: revelations from stable isotope fluctuations and feeding patterns: revelations from stable isotope fluctuations and feeding patterns
Autoři: Zacharia Mhande, Matobola Joel Mihale, Harieth Hellar-Kihampa, Natacha Brion, Willy Baeyens
Přispěvatelé: Faculty of Sciences and Bioengineering Sciences, Archaeology, Environmental changes & Geo-Chemistry, Biology, Chemistry, Vriendenkring VUB, FORMER_Analytical, Environmental & Geo-Chemistry
Zdroj: Environmental Monitoring and Assessment. 197
Informace o vydavateli: Springer Science and Business Media LLC, 2025.
Rok vydání: 2025
Témata: Carbon Isotopes, Nitrogen Isotopes, Nitrogen, Fishes/metabolism, Fishes, Carbon Isotopes/analysis, Environmental monitoring, Carbon cycle, Feeding Behavior, Nitrogen Cycle, Carbon/analysis, Tanzania, Carbon, Nitrogen/analysis, Carbon Cycle, Nitrogen Isotopes/analysis, Rivers, Rivers/chemistry, Animals, Seasons, Environmental Monitoring
Popis: This study investigated the availability, abundance, and seasonal variations of fish in Msimbazi, Kizinga, and Mbezi Rivers, Tanzania. Nine species, Schilbe mystus, Megalops cyprinoides, Terapon jarbua, Liza sp., Tilapia sp., Gerres filamentosus, Lutjanus fulvus, Clarias gariepinus, and Periophthalmus argentilineatus, were identified, with varying abundance across rivers and seasons. Fluctuations of mean %TOC and %TN in fish tissues were observed across seasons, with mean %TOC values varying from 30.4 ± 0.5% (during the dry season) to 35.1 ± 2.1% (during the wet season) and average %TN ranging from 9.3 ± 0.1% (in the dry season) to 10.7 ± 1.3% (in the wet season). Stable isotope ratios (δ13C, δ15N) also exhibited seasonal variations, with δ13C values ranging from - 21.3 ± 0.6‰ to - 16.0 ± 0.1‰ (dry season) and - 21.3 ± 1.1‰ to - 13.7 ± 0.1‰ (wet season), and δ15N values ranging from 9.3 ± 0.0‰ to 15.9 ± 2.7‰ (dry season) and 10.0 ± 0.1‰ to 17.9 ± 0.6‰ (wet season). These variations suggest diverse feeding habits and potential movement patterns between freshwater and marine environments. This study emphasizes the significance of factoring in seasonal fluctuations and dietary origins when investigating the ecology of fish inhabiting coastal rivers. Future research should focus on the impact of environmental factors (temperature, pH, dissolved oxygen) and human activities (land-use changes, pollution) on these ecosystems, with long-term monitoring programs being crucial for the sustainable management of these vital resources.
Druh dokumentu: Article
Jazyk: English
ISSN: 1573-2959
DOI: 10.1007/s10661-025-13625-2
Přístupová URL adresa: https://pubmed.ncbi.nlm.nih.gov/39904889
https://biblio.vub.ac.be/vubir/(f6dfef5b-bec8-42db-b38e-a9a4571d1e4d).html
Rights: Springer Nature TDM
Přístupové číslo: edsair.doi.dedup.....08ea8952747c082834ca830356f64040
Databáze: OpenAIRE
Popis
Abstrakt:This study investigated the availability, abundance, and seasonal variations of fish in Msimbazi, Kizinga, and Mbezi Rivers, Tanzania. Nine species, Schilbe mystus, Megalops cyprinoides, Terapon jarbua, Liza sp., Tilapia sp., Gerres filamentosus, Lutjanus fulvus, Clarias gariepinus, and Periophthalmus argentilineatus, were identified, with varying abundance across rivers and seasons. Fluctuations of mean %TOC and %TN in fish tissues were observed across seasons, with mean %TOC values varying from 30.4 ± 0.5% (during the dry season) to 35.1 ± 2.1% (during the wet season) and average %TN ranging from 9.3 ± 0.1% (in the dry season) to 10.7 ± 1.3% (in the wet season). Stable isotope ratios (δ13C, δ15N) also exhibited seasonal variations, with δ13C values ranging from - 21.3 ± 0.6‰ to - 16.0 ± 0.1‰ (dry season) and - 21.3 ± 1.1‰ to - 13.7 ± 0.1‰ (wet season), and δ15N values ranging from 9.3 ± 0.0‰ to 15.9 ± 2.7‰ (dry season) and 10.0 ± 0.1‰ to 17.9 ± 0.6‰ (wet season). These variations suggest diverse feeding habits and potential movement patterns between freshwater and marine environments. This study emphasizes the significance of factoring in seasonal fluctuations and dietary origins when investigating the ecology of fish inhabiting coastal rivers. Future research should focus on the impact of environmental factors (temperature, pH, dissolved oxygen) and human activities (land-use changes, pollution) on these ecosystems, with long-term monitoring programs being crucial for the sustainable management of these vital resources.
ISSN:15732959
DOI:10.1007/s10661-025-13625-2