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Ecophysiological changes through senescence in the marine calanoid copepod Acartia grani

AuthorsSaiz, Enric ; Calbet, Albert ; Griffell Martínez, Kaiene ; Isari, Stamatina ; Solé, Montserrat ; Peters, J.; Alcaraz, Miquel
Issue Date23-Feb-2015
PublisherAssociation for the Sciences of Limnology and Oceanography
Citation2015 Aquatic Sciences Meeting. Program Book: 73 (2015)
AbstractWe investigated the changes in vital rates and biochemical composition experienced by adult females of the calanoid copepod Acartia grani throughout senescence, until population death. Copepods were raised from eggs on a Rhodomonas baltica diet in triplicate 40 L tanks and transferred periodically to new tanks to avoid offspring recruitment. The variables weekly measured were: instantaneous mortality, body size, ingestion and clearance rates, respiration rates, egg production and hatching success rates, stoichiometric composition, fatty acid composition, and stress-related enzymatic activities. Mortality of the adult females reached daily rates of 20-40% in the last weeks of the experiment. Regarding vital rates, feeding was relatively constant (ca. 225,000 cells/female/day) during the first 3 weeks, but then declined to nil values by the end of the experiment. Egg production rates were also stable for most of the experiment (35-45 eggs/female/day) and eventually declined to 25 eggs/female/day. Hatching success varied from 90% in young females to ca. 50% in the oldest females. Respiration rates tended to increase through time. Overall, elemental composition and C:N:P ratios were relatively stable until death
DescriptionAquatic Sciences Meeting, Aquatic Sciences: Global And Regional Perspectives - North Meets South, 22-27 February 2015, Granada, Spain
Publisher version (URL)http://www.sgmeet.com/aslo/granada2015/program.asp
Appears in Collections:(ICM) Comunicaciones congresos
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