Dam, H. G. University of Connecticut, hgdam@uconnvm.uconn.edu
Colin, S. P. University of Connecticut, sec97003@uconnvm.uconn.edu
Ledger, J. F. University of Connecticut, jfl95001@uconnvm.uconn.edu

 
EFFECTS OF THE DINOFLAGELLATE PROROCENTRUM MINIMUM ON FEEDING, FECUNDITY AND EGG HATCHING OF THE COPEPOD ACARTIA TONSA
 
Blooms of the dinoflagellate Prorocentrum minimum have been reported, at times, to have harmful effects on benthic invertebrates, and some clones of this species indeed produce neurotoxins. However, the effect in planktonic consumers are less clear. In fact. P. minimum is often used as a control diet in studies whose goal is to examine the toxicity of diatom species to copepods. In controlled laboratory experiments, we examined ingestion rates, egg production and egg hatching rates of the copepod Acartia tonsa isolated from Long Island Sound feeding on a single clone of P. minimum also isolated from Long Island Sound, at food concentrations ranging from 25 to 500 ugC/L. Ingestion rates increased linearly with food concentration and were similar to those derived from other foods that are not suspected to be toxic. Egg production rates also increased linearly with food concentration, but were generally low (maximum rates ~ 15 egg female/d). Hatching rates were independent of food concentration and relatively high (80-100%). Whether P. minimum is toxic or simply a nutritional insufficient food source will be discussed in light of experiments in which mixtures of the good food Rhodomonas lens and P. minimum were offered to A. tonsa and ingestion and egg production were monitored.
 
Day: Wednesday, Feb. 3
Time: 11:15 - 11:30am
Location: Hilton of Santa Fe
 
Code: SS21WE1130H