||Stable isotopes reveal the importance of terrestrially derived resources for the diet of the freshwater pearl mussel (Margaritifera margaritifera)
||Brauns, M.; Berendonk, T.; Berg, S.; Grunicke, F.; Kneis, D.; Krenek, S.; Schiller, T.; Schneider, J.; Wagner, A.; Weitere, M.
||Aquatic Conservation: Marine and Freshwater Ecosystems
||T5 Future Landscapes
||aquatic–terrestrial coupling; conservation; feeding ecology; mixing models; species conservation; stable isotope analysis
freshwater pearl mussel (FPM) is among the most endangered freshwater
species worldwide. The few remaining populations suffer from low
recruitment rates and are subject to habitat fragmentation, pollution,
siltation, decline or loss of host fish populations, and climate change.
conservation strategies for FPM require a holistic understanding of its
ecological requirements, life history, population dynamics, and habitat
prerequisites. Although habitat requirements are well described, food
requirements at different life stages have received less attention.
isotope analyses of FPM and potential food resources in three German
streams were combined with mixing model analysis to quantify organic
matter resources assimilated by juvenile (first year after encystment from
host fish) and semi-adult (10 years old, immature) individuals.
were only slight differences in dietary contributions between the two life
stages, and terrestrial particulate organic matter and benthic organic
matter contributed substantially to the diet. Tissue type was more
important in explaining variation in dietary contributions than individual
variation for semi-adult FPM. The strong reliance on terrestrial resources
sheds new light on the functional role of unionid mussels and the
connection of streams to their riparian area.
dependence of FPM on terrestrial resources also emphasizes the need for a
stronger focus on the restoration and protection of intact riparian areas,
including wetlands with their specific vegetation, when planning
conservation and management strategies for threatened FPM populations.
|Persistent UFZ Identifier
|Brauns, M., Berendonk, T., Berg, S., Grunicke, F., Kneis, D., Krenek, S., Schiller, T., Schneider, J., Wagner, A., Weitere, M. (2021):
Stable isotopes reveal the importance of terrestrially derived resources for the diet of the freshwater pearl mussel (Margaritifera margaritifera)
Aquat. Conserv.-Mar. Freshw. Ecosyst. 31 (9), 2496 - 2505