Vertical distribution of zooplankton glutamate dehydrogenase in relation to chlorophyll in the vicinity of the Nantucket Shoals

Autor:	F. D. King
Rok vydání:	1984
Předmět:	Biogeochemical cycle Ecology Glutamate dehydrogenase chemistry.chemical_element Stratification (water) Aquatic Science Biology Nitrogen Zooplankton chemistry.chemical_compound Oceanography chemistry Chlorophyll Environmental chemistry Respiration Ammonium Ecology Evolution Behavior and Systematics
Zdroj:	Marine Biology. 79:249-256
ISSN:	1432-1793 0025-3162
Popis:	The vertical distributions of chlorophyll, and zooplankton glutamate dehydrogenase (GDH) and respiratory electron transport system (ETS) activities were measured at five stations in the vicinity of the Nantucket Shoals using a submersible pump-profiling system. Distinctly lower zooplankton GDH activities and chlorophyll concentrations were found at a station showing little vertical stratification as compared to the other stations where vertical stratification was more pronounced. Maximum GDH activity was observed at or immediately above the chlorophyll maximum at the stratified stations. Respiration to excretion (O:N) ratios determined from the enzyme data were lowest in or just above the chlorphyll maximum, suggesting proteolytic catabolism at those depths. Both features had previously been observed in the oligotrophic Gulf of Mexico. Ammonium excretion determined from GDH activity was estimated to provide 20 to 40% of the total algal nitrogen requirement.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::b822f016d597f97e02323653dc93ea8c https://doi.org/10.1007/bf00393256 Zobrazit plný text záznamu Full text from SpringerLink