A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Population structure, life cycle, and trophic niche of the glacial relict amphipod, Gammaracanthus lacustris, in a large boreal lake (2019)
Salonen, J. K., Hiltunen, M., Figueiredo, K., Paavilainen, P., Sinisalo, T., Strandberg, U., Kankaala, P., & Taskinen, J. (2019). Population structure, life cycle, and trophic niche of the glacial relict amphipod, Gammaracanthus lacustris, in a large boreal lake. Freshwater Biology, 64(12), 2176-2188. https://doi.org/10.1111/fwb.13404
JYU-tekijät tai -toimittajat
Julkaisun tiedot
Julkaisun kaikki tekijät tai toimittajat: Salonen, Jouni K.; Hiltunen, Minna; Figueiredo, Kaisa; Paavilainen, Pinja; Sinisalo, Tuula; Strandberg, Ursula; Kankaala, Paula; Taskinen, Jouni
Lehti tai sarja: Freshwater Biology
ISSN: 0046-5070
eISSN: 1365-2427
Julkaisuvuosi: 2019
Volyymi: 64
Lehden numero: 12
Artikkelin sivunumerot: 2176-2188
Kustantaja: Wiley-Blackwell Publishing Ltd.
Julkaisumaa: Britannia
Julkaisun kieli: englanti
DOI: https://doi.org/10.1111/fwb.13404
Julkaisun avoin saatavuus: Ei avoin
Julkaisukanavan avoin saatavuus:
Julkaisu on rinnakkaistallennettu (JYX): https://jyx.jyu.fi/handle/123456789/66376
Julkaisu on rinnakkaistallennettu: https://erepo.uef.fi/handle/123456789/7773
Tiivistelmä
Both day and night, the G. lacustris population occurred at depths below 25 m at temperatures <8°C, and the density increased towards the bottom of the lake, where it was 0.4–0.6 individuals/m3.
Gammaracanthus lacustris was observed to reach a length of >40 mm and live up to 4 years. The oldest and the largest individuals and females seemed to favour the deepest zones.
In October, almost 100% of females with length at least 25 mm (i.e. females presumably at least 1‐year‐old) had an embryo sack with 20–200 eggs or embryos—the larger the female, the more young it had.
The developing eggs of G. lacustris had a very high fatty acid content, indicating that the females invest heavily on provisioning their young. Furthermore, the fatty acid composition differed among life stages, and in particular the eggs had a higher proportion of eicosapentaenoic acid than juveniles or adults.
The stable δ13C and δ15N isotope ratios and fatty acid biomarkers of the food web, together with visual observations, indicate that G. lacustris is a carnivore that feeds mainly on zooplankton and other relict macrocrustaceans.
Due to its high content of essential polyunsaturated fatty acids, G. lacustris is a valuable prey for fish and other predators in the food web. However, as a glacial relict with strict habitat requirements the species is vulnerable to global warming and local environmental changes. These facts should be considered in the management of lakes and their catchments.
YSO-asiasanat: äyriäiset; katkat; lihansyöjät; reliktilajit; populaatiot; ravintoketjut; ekologinen lokero; lisääntyminen; rasvahapot; isotoopit
Vapaat asiasanat: carnivorous crustacean; fatty acids; food web; stable isotope analysis; vertical distribution
Liittyvät organisaatiot
OKM-raportointi: Kyllä
Raportointivuosi: 2019
JUFO-taso: 2