Comment. What drives plankton seasonality in a stratifying shelf sea? Some competing and complementary theories

Atkinson, A, Polimene, L, Fileman, ES, Widdicombe, CE, McEvoy, AJ, Smyth, TJ, Djeghri, N, Sailley, SF and Cornwell, LE 2018 Comment. What drives plankton seasonality in a stratifying shelf sea? Some competing and complementary theories. Limnology and Oceanography, 63 (6). 2877-2884.

Kenitz comment_revised ACCEPTED.pdf - Accepted Version
Available under License Creative Commons Attribution Non-commercial.

Download (797kB) | Preview
Official URL:


The Plymouth L4 time plankton series in the Western English Channel is a textbook example of a shallow, stratifying shelf sea system. Over its 30 yr of weekly sampling, this site has provided a diverse and contrasting suite of numerical and conceptual models of plankton bloom formation, phenology, and seasonal succession. The most recent of these papers, Kenitz et al. (2017) has initiated this comment, partly because we feel that it has presented a slightly misleading picture of the plankton composition at this site, and of a robust, recurring seasonal succession. We address this by illustrating the extent of inter‐annual variability in phenology that occurs at the site, and which needs to be captured better within models. However our main aim is to foster a much better integration of the variety of top‐down and bottom‐up processes that have all been suggested to be key in driving seasonal succession. Some of these, particularly the multiple grazing and growth controls contributing to the so‐called “loophole hypothesis” may be complementary, but others, such as the role of copepod feeding traits in driving species succession (Kenitz et al. 2017) offer testable competing hypotheses. The basic assumptions and outputs of all these models need to be validated more critically, both against time series data and process studies that include the finding of unselective feeding. We suggest that the variability in plankton phenology (and not just mean timing and amplitude) could be used to diagnose the performance of alternative models of plankton succession.

Item Type: Publication - Article
Additional Information. Not used in RCUK Gateway to Research.: This is the peer reviewed version of the article which has been published in final form at This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions.
Divisions: Plymouth Marine Laboratory > National Capability categories > Western Channel Observatory
Plymouth Marine Laboratory > Science Areas > Marine Ecology and Biodiversity
Depositing User: Kim Hockley
Date made live: 19 Dec 2018 15:53
Last Modified: 25 Apr 2020 09:59

Actions (login required)

View Item View Item