Effects of age class on N removal capacity of oysters and implications for bioremediation

Effects of age class on N removal capacity of oysters and implications for bioremediation

ABSTRACT: Previous estimates of nitrogen (N) removal from coastal systems by either assimilation into tissues and shells of oysters or stimulated through biogeochemical processes have not accounted for ontogenetic changes in N sequestration. To understand how N removal may change with ontogeny, we c...

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Veröffentlicht in:Marine Ecology Progress Series. - Inter-Research, 1979. - 528(2015) vom: Mai, Seite 205-220
1. Verfasser: Dalrymple, D. Joseph (VerfasserIn)
Weitere Verfasser: Carmichael, Ruth H.
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2015
Zugriff auf das übergeordnete Werk:Marine Ecology Progress Series
Schlagworte:Aquaculture Eutrophication Shellfish Assimilation Restoration
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520 |a ABSTRACT: Previous estimates of nitrogen (N) removal from coastal systems by either assimilation into tissues and shells of oysters or stimulated through biogeochemical processes have not accounted for ontogenetic changes in N sequestration. To understand how N removal may change with ontogeny, we compared N in tissue, shell, and biodeposits between juvenile and adult oysters. Juvenile oysters assimilated 165 ± 8 mg (±SE) N oyster−1 into soft tissues and shell, while adult oysters lost mass and returned N to the estuary (−48 ± 21 mg N oyster−1). The percentage of N in soft tissues (11.80 ± 0.01) did not differ between age classes but was significantly higher than measured elsewhere. The percentage of N in shell averaged 0.46 ± 0.01 and 0.26 ± 0.01 in juveniles and adults, respectively, accounting for ≥50% of total N in oysters. N released in biodeposits was estimated at 0.21 ± 0.00 to 0.23 ± 0.00 mg N oyster−1 d−1 and did not differ between age classes. Accurate quantification of N removal by oysters, therefore, should account for age and location-specific variation by including direct measurements of N assimilated into tissues and shell, released in biodeposits, and removed by biogeochemical processes. Continuous N sequestration and removal from local waters for bioremediation may require balancing recruitment or planting of young actively growing oysters with harvest of larger animals to ensure net N removal by assimilation before growth declines. This strategy may be particularly useful where environmental conditions do not support significant N removal through biogeochemical processes. 
540 |a © Inter-Research 2015 
650 4 |a Aquaculture 
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700 1 |a Carmichael, Ruth H.  |e verfasserin  |4 aut 
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