Reduced efficiency of pelagic-benthic coupling in the Arctic deep sea during lower ice cover.

ABSTRACT: Pelagic-benthic coupling describes the connection between surface-water production and seafloor habitats via energy, nutrient and mass exchange. Massive ice loss and warming in the poorly studied Arctic Chukchi Borderland are hypothesized to affect this coupling. The strength of pelagic-benthic coupling was compared between 2 years varying in climate settings, 2005 and 2016, based on δ¹³C and δ¹⁵N stable isotopes of food-web end-members and pelagic and deep-sea benthic consumers. Considerably higher isotopic niche overlap and generally shorter isotopic distance were found between pelagic and benthic food web components in 2005 than in 2016, suggesting weaker coupling in the latter, low-ice year. δ¹⁵N values indicated more refractory food consumed by benthos

SUBMITTER: Zhulay I 

PROVIDER: S-EPMC10130029 | biostudies-literature | 2023 Apr

REPOSITORIES: biostudies-literature