Intraspecific facilitation by allelochemical mediated grazing protection within a toxigenic dinoflagellate population


Contact
Uwe.John [ at ] awi.de

Abstract

Dinoflagellates are a major cause of harmful algal blooms (HABs), with consequences for coastal marine ecosystem functioning and services. Alexandrium fundyense (previously Alexandrium tamarense) is one of the most abundant and widespread toxigenic species in the temperate Northern and Southern Hemisphere and produces paralytic shellfish poisoning toxins as well as lytic allelochemical substances. These bioactive compounds may support the success of A. fundyense and its ability to form blooms. Herewe investigate the impact of grazing on monoclonal and mixed set-ups of highly (Alex2) and moderately (Alex4) allelochemically active A. fundyense strains and a non-allelochemically active conspecific (Alex5) by the heterotrophic dinoflagellate Polykrikos kofoidii. While Alex4 and particularly Alex5 were strongly grazed by P. kofoidii when offered alone, both strains grew well in the mixed assemblages (Alex4 þ Alex5 and Alex2 þ Alex5). Hence, the allelochemical active strains facilitated growth of the non-active strain by protecting the population as awhole against grazing. Based on our results, we argue that facilitation among clonal lineages within a species may partly explain the high genotypic and phenotypic diversity of Alexandrium populations. Populations of Alexandrium may comprise multiple cooperative traits that act in concert with intraspecific facilitation, and hence promote the success of this notorious HAB species.



Item Type
Article
Authors
Divisions
Primary Division
Programs
Primary Topic
Peer revision
ISI/Scopus peer-reviewed
Publication Status
Published
Eprint ID
36619
DOI 10.1098/rspb.2014.1268

Cite as
John, U. , Tillmann, U. , Hülskötter, J. , Alpermann, T. J. , Wohlrab, S. and Van de Waal, D. B. (2015): Intraspecific facilitation by allelochemical mediated grazing protection within a toxigenic dinoflagellate population , Proceedings Royal Society B, 282 (1798), p. 20141268 . doi: 10.1098/rspb.2014.1268


Download
[img]
Preview
PDF
John_et_al_2014_ProcRSocB_mutual_facilitation.pdf

Download (377kB) | Preview
Cite this document as:

Share


Citation

Research Platforms
N/A

Campaigns


Actions
Edit Item Edit Item