Assemblages of pelagic thaliaceans in oceanographic features at the tropical-temperate transition zone of a western boundary current

Author:

Pitt Kylie A1ORCID,Lawley Jonathan W1ORCID,Hinchliffe Charles2,Matis Paloma A23ORCID,OlguÍn-Jacobson Carolina14,Arafeh-Dalmau Nur456ORCID,Lindholm Pauline1,Arnold Jade1,Suthers Iain M23ORCID

Affiliation:

1. Griffith University School of Environment and Science, Coastal and Marine Research Centre, Australian Rivers Institute, Gold Coast Campus, , Southport, QLD 4222 , Australia

2. University of New South Wales School of Biological, Earth, and Environmental Sciences, , Sydney, NSW 2052 , Australia

3. Sydney Institute of Marine Science , Chowder Bay Road, Mosman, NSW 2088 , Australia

4. Stanford Doerr School of Sustainability Hopkins Marine Station, , Stanford University, Pacific Grove, Stanford, CA 94305 , USA

5. The University of Queensland Centre for Biodiversity and Conservation Science, School of Biological Sciences, , St Lucia, QLD 4072 , Australia

6. University of California Los Angeles Department of Geography, , Los Angeles, CA 90095 , USA

Abstract

AbstractMesoscale oceanographic features influence the composition of zooplankton. Cyclonic eddies can promote upwelling and production of gelatinous zooplankton, which play critical roles in ocean biogeochemical cycling. We examined variation in assemblages of thaliaceans (salps, doliolids and pyrosomes) among mesoscale oceanographic features at the tropical-temperate boundary of the East Australian Current (EAC) in Spring 2019 and Autumn 2021. The influence of cyclonic eddies was examined in a large offshore cyclonic eddy in 2019 and a newly formed frontal eddy in 2021. Pyrosomes were most abundant in the offshore EAC jet, and salps and doliolids were most abundant in coastal features, including within eddies that were transported offshore. In 2019, Salpa fusiformis increased 4-fold over 8 days in the large cyclonic eddy, and in 2021, doliolids increased > 50-fold over 2 weeks in a chlorophyll-rich coastal eddy while abundances of other thaliaceans remained unchanged or decreased. Correlations between abundances of thaliaceans and chlorophyll-a concentrations across the 102 samples collected during both voyages revealed that doliolids occupy a wider range of chlorophyll-a concentrations than salps. Our observations indicate that doliolids thrive in productive shelf environments, salps occur in less productive shelf waters and pyrosomes are most abundant in oligotrophic waters of the south Coral Sea.

Publisher

Oxford University Press (OUP)

Subject

Ecology,Aquatic Science,Ecology, Evolution, Behavior and Systematics

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