Seasonality of Oithona similis and Calanus helgolandicus reproduction and abundance: contrasting responses to environmental variation at a shelf site

Cornwell, L; Findlay, HS; Fileman, ES; Smyth, TJ; Hirst, AG; Bruun, JT; McEvoy, AJ; Widdicombe, CE; Castellani, C; Lewis, C; Atkinson, A. 2018 Seasonality of Oithona similis and Calanus helgolandicus reproduction and abundance: contrasting responses to environmental variation at a shelf site. Journal of Plankton Research, 40 (3). 295-310. 10.1093/plankt/fby007

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Abstract/Summary

The pelagic copepods Oithona similis and Calanus helgolandicus have overlapping geographic ranges, yet contrast in feeding mode, reproductive strategy, and body size. We investigate how these contrasting traits influence the seasonality of copepod abundance and reproductive output under environmental variation, using time series data collected over 25 years at the Western Channel Observatory station L4. The proportional change in Egg Production Rate (EPR, eggs female-1 d-1) over the annual cycle was ~10-fold and similar for both species, although EPR of O. similis was only ~ 11% that of C. helgolandicus. The timing of EPR maxima for O. similis coincided with increased Sea Surface Temperature (SST) in summer, likely due to a temperature-dependent brooding period. Conversely, EPR of broadcast spawning C. helgolandicus was more strongly related to Net Heat Flux (NHF) and diatom biomass, both parameters associated with the spring phytoplankton bloom. In both species, female body mass negatively correlated with SST, with a 7.5% reduction in body mass per °C in C. helgolandicus compared to just 2.3% in O. similis. Finally, seasonality of EPR and adult and copepodite abundance was strongly decoupled in both species, suggesting that optimum conditions for reproduction and abundance occur at different times of the year.

Item Type: Publication - Article
Additional Information. Not used in RCUK Gateway to Research.: This is a pre-copyedited, author-produced version of an article accepted for publication in Journal of Plankton Research following peer review. The version of record L E Cornwell, H S Findlay, E S Fileman, T J Smyth, A G Hirst, J T Bruun, A J McEvoy, C E Widdicombe, C Castellani, C Lewis, A Atkinson; Seasonality of Oithona similis and Calanus helgolandicus reproduction and abundance: contrasting responses to environmental variation at a shelf site, Journal of Plankton Research, Volume 40, Issue 3, 1 May 2018, Pages 295–310, is available online at: https://doi.org/10.1093/plankt/fby007.
Subjects: Biology
Botany
Data and Information
Marine Sciences
Divisions: Plymouth Marine Laboratory > National Capability categories > Added Value
Plymouth Marine Laboratory > National Capability categories > Western Channel Observatory
Plymouth Marine Laboratory > Science Areas > Marine Ecology and Biodiversity
Depositing User: Claire Widdicombe
Date made live: 04 Apr 2018 15:01
Last Modified: 27 Jun 2018 10:57
URI: http://plymsea.ac.uk/id/eprint/7838

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  • Seasonality of Oithona similis and Calanus helgolandicus reproduction and abundance: contrasting responses to environmental variation at a shelf site. (deposited 04 Apr 2018 15:01) [Currently Displayed]

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