Oithona similislikes it cool: evidence from two long-term time series

Castellani, C; Licandro, P; Fileman, ES; Di Capua, I; Mazzocchi, MG. 2015 Oithona similislikes it cool: evidence from two long-term time series. Journal of Plankton Research. fbv104. 10.1093/plankt/fbv104

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Official URL: http://dx.doi.org/10.1093/plankt/fbv104

Abstract/Summary

We compare the long-term and seasonal patterns of abundance and phenology of the cyclopoid copepod Oithona similis at the L4 site (1988–2013) in the North Atlantic and at the LTER-MC site (1984–2013) in the Mediterranean Sea to investigate whether high temperature limits the occurrence of this species with latitudinal cline. The two sites are well suited to testing this hypothesis as they are characterized by similar chlorophyll a concentration (Chl a) but different temperature [sea surface temperature (SST)]. The abundance of O. similis at L4 was ∼10 times higher than at LTER-MC. Moreover, this species had several peaks of abundance during the year at L4 but a single peak in spring at LTER-MC. The main mode of temporal variability in abundance was seasonal at both sites. The abundance of O. similis was negatively correlated with SST only at LTER-MC, whereas it was positively correlated with Chl a at both sites. Oithona similis had a temperature optimum between 15 and 20°C reaching maximum abundance at ∼16.5°C at LTER-MC, but showed no Chl a optimum at either site. We conclude that the abundance of O. similis increases with prey availability up to 16.5°C and that temperature >20°C represents the main limiting factor for population persistence.

Item Type: Publication - Article
Additional Keywords: time series copepod Oithona similis temperature Atlantic Mediterranean
Subjects: Biology
Marine Sciences
Divisions: Marine Biological Association of the UK > Other (MBA)
Plymouth Marine Laboratory > National Capability categories > Western Channel Observatory
Plymouth Marine Laboratory > Science Areas > Marine Ecology and Biodiversity
Depositing User: Elaine Fileman
Date made live: 21 Jan 2016 12:40
Last Modified: 06 Jun 2017 16:14
URI: http://plymsea.ac.uk/id/eprint/6746

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