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Publication . Article . 2015

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

Claudia Castellani; Priscilla Licandro; Elaine S. Fileman; Iole Di Capua; Maria Grazia Mazzocchi;
Open Access
Published: 23 Dec 2015 Journal: Journal of Plankton Research, volume 38, pages 703-717 (issn: 0142-7873, eissn: 1464-3774, Copyright policy )
Publisher: Oxford University Press (OUP)

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.

Subjects by Vocabulary

Microsoft Academic Graph classification: Cline (biology) Sea surface temperature Abundance (ecology) Biology Phenology Copepod biology.organism_classification Population education.field_of_study education Ecology Chlorophyll a chemistry.chemical_compound chemistry Mediterranean sea


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

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