The roles of flowering, overwinter survival and sea surface temperature in the long-term population dynamics of Zostera marina around the Isles of Scilly, UK.

Abstract:

:Interaction between biotic and abiotic drivers of dynamics is an important topic in ecology. Despite numerous short-term studies, there is a paucity of evidence about how environmental structure modifies dynamics in marine systems. We quantified Zostera marina flowering and non-flowering shoot density annually from 1996 to 2012 around the Isles of Scilly, UK, parameterizing a population dynamic model. Flowering is structured in time and space, with temperature and flowering positively associated at some locations only. We found no evidence that flower production contributes to seagrass density but 'patchiness' was positively associated with flowering in the previous year. With evidence of substantial overwinter survival, findings support the hypothesis that local populations are maintained largely through vegetative reproduction but sexual reproduction may contribute to colonisation of vacant habitat. This long-term study (1) tests validity of shorter-term investigations, (2) quantifies interaction between biotic and abiotic factors and (3) promotes seagrass as a model ecosystem.

journal_name

Mar Pollut Bull

authors

Potouroglou M,Kenyon EJ,Gall A,Cook KJ,Bull JC

doi

10.1016/j.marpolbul.2014.03.035

subject

Has Abstract

pub_date

2014-06-30 00:00:00

pages

500-7

issue

2

eissn

0025-326X

issn

1879-3363

pii

S0025-326X(14)00165-9

journal_volume

83

pub_type

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