Sammanfattning

Inflows of coloured terrestrial organic matter cause seawater browning and reduced phytoplankton production in subarctic coastal ecosystems, potentially deteriorating the nutritional quality of marine food webs. We analyzed the fatty-add (FA) compositions of seston and the zooplankton taxa Eutytemora affinis and cladocerans at three locations of the northern Baltic Sea. At the coastal and northerly locations, salinity and phosphorus concentrations were low, while concentrations of humic substances (i.e., terrestrial organic matter) were high. The southerly location showed the opposite trend. The ratio between alga-specific omega 3 polyunsaturated FA and terrigenous monounsaturated FA (MUFA) in Fun/femora decreased from south to north, as did the ratio between the alga-specific docosahexaenoic add (DHA) and terrigenous MUFA in cladocerans. With increasing humic substances, the biomass of DHA-rich phytoplankton decreased and the zooplankton MUFA content increased. Our results indicate that coloured terrestrial organic matter alters the phytoplankton composition, consequently affecting the zooplankton nutritional quality.

Publicerad i

Canadian Journal of Fisheries and Aquatic Sciences
2022, Volym: 79, nummer: 8, sidor: 1291-1301
Utgivare: CANADIAN SCIENCE PUBLISHING

SLU författare

• Lau, Danny C P

  • Institutionen för vatten och miljö, Sveriges lantbruksuniversitet
    
  • Umeå Universitet

Globala målen

SDG14 Bevara och nyttja haven och de marina resurserna på ett hållbart sätt för en hållbar utveckling


UKÄ forskningsämne

Ekologi
Fisk- och akvakulturforskning


Publikationens identifierare

DOI: https://doi.org/10.1139/cjfas-2021-0118

Permanent länk till denna sida (URI)

https://res.slu.se/id/publ/117284