age structure, carbonate production and shell loss rate in an early miocene reef of the giant oyster crassostrea gryphoides
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ID: 159819
2016
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Abstract
We present the first analysis of population structure and cohort distribution
in a fossil oyster shell bed based on 1121 shells of the giant
oyster Crassostrea gryphoides (von Schlotheim, 1813). Data derive
from terrestrial laser scanning of a Lower Miocene shell bed covering
459 m2. Within two transects, individual shells were manually outlined
on a digital surface model and cross-checked based on high-resolution
orthophotos, resulting in accurate information on center line length and area
of exposed shell surface. A growth model was calculated, revealing this
species as the fastest growing and largest Crassostrea known so far.
Non-normal distribution of size, area and age data hints at the presence of
at least four distinct recruitment cohorts. The rapid decline of frequency
amplitudes with age is interpreted to be a function of mortality and shell
loss. The calculated shell half-lives range around a few years, indicating that
oyster reefs were geologically short-lived structures, which could have been
fully degraded on a decadal scale.
Crassostrea gryphoides reefs were widespread and common along the Miocene circum-Tethyan coasts. Given its enormous growth performance of ∼ 150 g carbonate per year this species has been an important carbonate producer in estuarine settings. Yet, the rapid shell loss impeded the formation of stable structures comparable to coral reefs.
Crassostrea gryphoides reefs were widespread and common along the Miocene circum-Tethyan coasts. Given its enormous growth performance of ∼ 150 g carbonate per year this species has been an important carbonate producer in estuarine settings. Yet, the rapid shell loss impeded the formation of stable structures comparable to coral reefs.
| Reference Key |
harzhauser2016biogeosciencesage
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|---|---|
| Authors | ;M. Harzhauser;A. Djuricic;O. Mandic;T. A. Neubauer;M. Zuschin;N. Pfeifer |
| Journal | tetrahedron letters |
| Year | 2016 |
| DOI |
10.5194/bg-13-1223-2016
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| URL | |
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