Shelled pteropod abundance and distribution across the Mediterranean Sea during spring

Johnson, Roberta; Manno, Clara ORCID: https://orcid.org/0000-0002-3337-6173; Ziveri, Patrizia. 2023 Shelled pteropod abundance and distribution across the Mediterranean Sea during spring. Progress in Oceanography, 210, 102930. 14, pp. https://doi.org/10.1016/j.pocean.2022.102930

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Abstract/Summary

Thecosome pteropods are a dominant group of calcifying pelagic molluscs and an important component of the food web. In this study, we characterise spring pteropod distribution throughout the Mediterranean Sea, an understudied region for this common group of marine calcifying organisms. This semi-enclosed sea is rapidly changing under climatic and anthropogenic forcings. The presence of surface water biogeochemical gradients from the Atlantic Ocean/Gibraltar Strait to the Eastern Mediterranean Sea allowed us to investigate pteropod distribution and their ecological preferences. In the ultra-oligotrophic Eastern Mediterranean Sea, we found the mean upper 200 m pteropod standing stock of 2.13 ind. m-3 was approximately 5x greater than the Western basin (mean 0.42 ind. m-3). Where standing stocks were high, pteropods appeared largely in the same family grouping belonging to Limacinidae. Temperature, O2 concentration, salinity, and aragonite saturation (Ωar) explain 96% of the observed variations in the community structure at the time of sampling, suggesting that pteropods might show a preference for environmental conditions with a lower energetic physiological demand. We also document that pteropods and planktonic foraminifera have an opposite geographical distribution in the Mediterranean Sea. Our findings indicate that in specific pelagic ultra-oligotrophic conditions, such as the Eastern Mediterranean Sea, different feeding strategies could play an important role in regulating calcifying zooplankton distribution.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	https://doi.org/10.1016/j.pocean.2022.102930
ISSN:	00796611
Additional Keywords:	Pteropod, Mediterranean Sea, Ocean acidification, Ocean warming, Plankton, Foraminifera, aragonite, Heliconoides inflatus, ecology
Date made live:	08 Dec 2022 11:16 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/533700

Item Type:

Publication - Article

Digital Object Identifier (DOI):

https://doi.org/10.1016/j.pocean.2022.102930

ISSN:

00796611

Additional Keywords:

Pteropod, Mediterranean Sea, Ocean acidification, Ocean warming, Plankton, Foraminifera, aragonite, Heliconoides inflatus, ecology

Date made live:

08 Dec 2022 11:16 +0 (UTC)

URI:

https://nora.nerc.ac.uk/id/eprint/533700