Egg production and hatching success in the peri-Antarctic copepod Calanus simillimus |
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Authors: | Miralto A; Ianora A; Guglielmo L; Zagami G; Buttino I |
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Institution: | Stazione Zoologica A. Dohrn Villa Comunale 80121 Naples
1Dipartimento di Biologia Animate ed Ecologia Marina, Università di Messina Contrada Sperone 31,98166 Messina, Italy |
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Abstract: | In situ rates of egg production and hatching success are reportedfor Calanus simillimus, one of the most abundant calanoid speciesin peri-Antarctic regions, during the Italian Italicscruise in the Straits of Magellan in March-April 1995. Low fecundity(8.6 eggs female1 day1) and fecal pellet production(0.8 fecal pellets female1 day1) in this periodindicate that the species was feeding very poorly. Sixty-sixof the 126 females sampled did not produce eggs and 80 of thesedid not produce any fecal pellets during the 24 h period ofincubation. Striking abnormal naupliar and embryonic developmentwas recorded in 81.8% of the eggs spawned. Aberrant eggs didnot undergo normal cleavage, and failed to develop to hatching.Deformed nauplii were asymmetrical and presented strong anatomicalanomalies in the total body length and number of swimming appendages.These results are discussed in the light of recent findingson the causes of low hatching success in copepods. |
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