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Long-term survival of epibenthicCerastoderma edule (L.) in bivalve clusters on backbarrier tidal flats, North Sea

Content Provider	Springer Nature Link
Author	Wehrmann, Achim
Copyright Year	1999
Abstract	Over a two year-period, the composition and structure of epibenthic bivalve clusters on a backbarrier tidal flat of the East Frisian Wadden Sea was studied. The bivalve clusters developed from an intense and approximately simultaneous spatfall of the two most conspicuous bivalve species,Mytilus edulis andCerastoderma edule. Spatfall occurred between two severe winters characterized by massive drift-ice coverage over several weeks. Extended shell-layers, usually representing favorable secondary hardgrounds for initial settlement ofM. edulis were not colonized, whereas a thin layer of juvenileM. edulis andC. edule was found on the adjacent sandy tidal flat. During the second growth season the thin layer developed into epibenthic bivalve clusters of different size, composed predominantly of living specimens ofC. edule. Normally,C. edule has an endobenthic life-mode, living burrowed just a few cm below the sediment surface.In contrast to previous studies, the great bulk of epibenthic specimens of C.edule did survive within the clusters.C. edule dominates in these clusters except in the most central parts of the tidal flat where more or less monospecificMytilus-beds occur. The growth rates (in length) of both bivalve species show characteristic trends: high values are related to (i) high submersion time and (ii) low population densities. Beyond this, the highest annual growth rates were observed during the first year, in general. Special emphasis was given to the growth trend of the epibenthicC. edule specimens from the bivalve clusters. Here, the shell-length values were only slightly lower, compared to those from adjacent endobenthic populations of the same spatfall.In general, the study shows that enforced epibenthic life-mode inC. edule does not, as a consequence, result in both mass-mortality or unfavorable growth conditions.
Starting Page	47
Ending Page	61
Page Count	15
File Format	PDF
ISSN	0080889X
Journal	Marine Biodiversity
Volume Number	30
Issue Number	1-2
Language	English
Publisher	Springer-Verlag
Publisher Date	1999-01-01
Publisher Place	Berlin, Heidelberg
Access Restriction	Subscribed
Subject Keyword	bivalve clusters mussel beds epibenthic life mode growth rates larval settlement tidal flats paleoecology Biodiversity Freshwater & Marine Ecology Plant Systematics/Taxonomy/Biogeography Animal Systematics/Taxonomy/Biogeography
Content Type	Text
Resource Type	Article
Subject	Aquatic Science Oceanography

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