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首页> 外文期刊>Marine biology >Seasonal contrasts in abundance and reproductive parameters of Penilia avirostris (Cladocera, Ctenopoda) in a coastal subtropical area
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Seasonal contrasts in abundance and reproductive parameters of Penilia avirostris (Cladocera, Ctenopoda) in a coastal subtropical area

机译：亚热带滨海亚热带地区Penilia avirostris（Cladocera，Ctenopoda）的丰度和生殖参数的季节性差异

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摘要

We studied the population dynamics and the reproductive biology of Penilia avirostris during three consecutive years on the inner shelf off Ubatuba, Brazil. Penilia avirostris individuals and its eggs and embryos were counted, measured, and classified into stages. The species occurred throughout the studied period, in a wide temperature range (14.8-28.2℃). Cladoceran densities were usually higher (>2,000 ind m~(-3)) in warm seasons, when the water column was stratified as a consequence of bottom intrusions of the cold- and nutrient-rich South Atlantic Central Water. Juveniles, non-reproducing females, and parthenogenic females were the dominant developmental stages. Males and gamogenic females were rare and only occurred when females reached peak abundances. This suggests that in tropical and subtropical coastal seas gamogenesis in P. avirostris is not as common as in temperate seas, but may play a significant role in the density-dependent control of the population preceding unfavourable periods.
机译：我们连续三年在巴西乌巴图巴（Ubatuba）附近的内架上研究了无花青霉（Penilia avirostris）的种群动态和生殖生物学。对无核青霉个体及其卵和胚胎进行计数，测量和分类。该物种在整个研究期间内发生，温度范围很广（14.8-28.2℃）。当水柱因寒冷和营养丰富的南大西洋中央水体底部侵入而分层时，在温暖的季节，枝角藻的密度通常更高（> 2,000 ind m〜（-3））。少年，非生殖雌性和孤雌生殖是主要的发育阶段。雄性和致雌性雌性动物很少见，仅在雌性达到高峰时才发生。这表明，在热带和亚热带沿海海域，紫杉体育运动不如在温带海运动普遍，但可能在不利时期之前的人口密度控制中起重要作用。

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    《Marine biology》 |2010年第11期|P.2511-2519|共9页
  • 作者

    Leonardo K. Miyashita; rnMayza Pompeu; rnSalvador A. Gaeta; rnRubens M. Lopes;

  • 作者单位

    Department of Biological Oceanography, Oceanographic Institute, University of Sao Paulo, Praca do Oceanografico 191, Cidade Universitaria, Sao Paulo 05508-120, Brazil;

    rnDepartment of Biological Oceanography, Oceanographic Institute, University of Sao Paulo, Praca do Oceanografico 191, Cidade Universitaria, Sao Paulo 05508-120, Brazil;

    rnDepartment of Biological Oceanography, Oceanographic Institute, University of Sao Paulo, Praca do Oceanografico 191, Cidade Universitaria, Sao Paulo 05508-120, Brazil;

    rnDepartment of Biological Oceanography, Oceanographic Institute, University of Sao Paulo, Praca do Oceanografico 191, Cidade Universitaria, Sao Paulo 05508-120, Brazil;

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