The dailyEggProductionRate(EPR)ofthethreeAcartiidaecopepodsnamely Acartia clausi, Paracartia latisetosa and Paracartiagrani in theNorthLagoonofTuniswascomparedtotemperatureandfood availabilityeveryseasonfromMarch,2003toFebruary,2004correspondingtothemajorseasonal peaksoftheirabundanceandovera20-daysperiod.ThedailyEPRwasevaluatedbyassumingadirect correlationwithchlorophyll a, particulateorganiccarbon(POC),andsomeeasilyextractablemacro- molecularcompoundsfromtheseston,suchasproteins,carbohydratesandlipids.Theresultsshowed significantdifferencesinEPRbetweenseasonsandspecies.Temperatureandsalinitynegatively affectedthefecundityof A. clausi and positivelythatof P. latisetosa and P. grani. The A. clausi EPR was supportedbychlorophyll a and sestonicproteinswhilethatof P. latisetosa and P. grani correlated with POCsuggestingthatthesetwotaxafeedonmicrozooplanktonanddetritusmorethanon phytoplankton.Overall,EPRdatashowedpotentialpopulationrecruitmentevidentlythehighestin P. latisetosa in summer, P. grani in autumnand A. clausi in winter.Ourresultsindicatethattemperature and ood quality are the determining factors of both abundance and reproduction of the copepods under study.
IMPACT OF VERY WARM TEMPERATURE ON EGG PRODUCTION RATES OF THREE ACARTIIDAE (CRUSTACEA, COPEPODA) IN A NORTHERN AFRICAN LAGOON
BELMONTE, Genuario;
2012-01-01
Abstract
The dailyEggProductionRate(EPR)ofthethreeAcartiidaecopepodsnamely Acartia clausi, Paracartia latisetosa and Paracartiagrani in theNorthLagoonofTuniswascomparedtotemperatureandfood availabilityeveryseasonfromMarch,2003toFebruary,2004correspondingtothemajorseasonal peaksoftheirabundanceandovera20-daysperiod.ThedailyEPRwasevaluatedbyassumingadirect correlationwithchlorophyll a, particulateorganiccarbon(POC),andsomeeasilyextractablemacro- molecularcompoundsfromtheseston,suchasproteins,carbohydratesandlipids.Theresultsshowed significantdifferencesinEPRbetweenseasonsandspecies.Temperatureandsalinitynegatively affectedthefecundityof A. clausi and positivelythatof P. latisetosa and P. grani. The A. clausi EPR was supportedbychlorophyll a and sestonicproteinswhilethatof P. latisetosa and P. grani correlated with POCsuggestingthatthesetwotaxafeedonmicrozooplanktonanddetritusmorethanon phytoplankton.Overall,EPRdatashowedpotentialpopulationrecruitmentevidentlythehighestin P. latisetosa in summer, P. grani in autumnand A. clausi in winter.Ourresultsindicatethattemperature and ood quality are the determining factors of both abundance and reproduction of the copepods under study.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
