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Population dynamics and production of the planktonic copepods in a eutrophic inlet of the inland sea of Japan. IV. Pseudodiaptomus marinus, the egg-carrying calanoid
Liang, D.; Uye, S. (1997). Population dynamics and production of the planktonic copepods in a eutrophic inlet of the inland sea of Japan. IV. Pseudodiaptomus marinus, the egg-carrying calanoid. Mar. Biol. (Berl.) 128: 415-421
In: Marine Biology: International Journal on Life in Oceans and Coastal Waters. Springer: Heidelberg; Berlin. ISSN 0025-3162; e-ISSN 1432-1793
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| Trefwoorden |
Pseudodiaptomus marinus Sato, 1913 [WoRMS]
Marien/Kust |
| Abstract |
Population dynamics and production of the egg-carrying calanoid copepod Pseudodiaptomus marinus were studied for a year in Fukuyama Harbor, a eutrophic inlet of the Inland Sea of Japan. This species wasperennial, with a large numerical peak in June and small peaks in September/October and November/December. During the study period, at least 11 generations could be detected. For each generation, the stage-speci®c survival from egg to Copepodite Stage (C) V was determined; itwas very high during early life stages (egg to NIII), and gradually decreased beyond. On average, 94% of eggs recruited into NIII, which is strongly contrasted with very high (>ca. 90%) mortality during the corresponding stages for free-spawning copepods, i.e. Acartia omorii, Centropages abdominalis and Paracalans sp. Thisdemonstrates that the egg-carrying strategy has a great advantage to reduce mortality in egg stage. The biomass of this species showed marked seasonal variations largely in parallel with numerical abundance. The instantaneous somatic growth rate increased linearly withtemperature. The population production rate was estimated as the sum of somatic growth of larval stages and egg production of adult females; the annual integration was 51.0 mg C m-3 yr-1 or 0.38 g C m-2 yr-1. |
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