Does macroalgal vegetation cover influence post-settlement survival and recruitment potential of juvenile black rockfish Sebastes cheni?
Does macroalgal vegetation cover influence post-settlement survival and recruitment potential of juvenile black rockfish Sebastes cheni?
复制标题
大型藻类植被覆盖是否影响幼年黑岩鱼 Sebastes cheni 的定居后生存和补充潜力？
DOI：
10.1016/j.ecss.2013.05.028
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发表时间：
2013
期刊：
影响因子：
--
通讯作者：
Jun SHOJI
中科院分区：
文献类型：
--
作者：
Yasuhiro KAMIMURA;Jun SHOJI
植被复盖度的季节性变化影响了定居后温带大型藻类床中黑岩鱼幼体的群体特定死亡率。2008年2月至5月，在日本西南部的中部色藤内海，每隔一至两周共进行了14次鱼类和环境调查。用耳石日轮估计鱼的出生日期，然后将鱼分成7组(A到F)，每组涵盖7天的出生日期期。全长(TL)20~60 mm的幼虫群体特定生长系数(G，d−1)在0.031~0.048之间，死亡系数(M，d−1)在0.038~0.081之间，随着季节的推移，这两个值都有显著的增加。作为招募潜力的替代指标，G：M的比率在0.59到0.99之间，在后来的队列中较低。水温从3月份的10.9℃上升到5月份的18.2℃，植被盖度(马尾藻体积百分比)从3月份的60%下降到5月份的2%。后一批幼虫的生长和死亡率较高，与高温和低植被盖度有关。由于M的季节性增长大于OFG，因此后一个队列的招募潜力低于前一个队列。
Seasonal change in vegetation coverage affected cohort-specific mortality of post-settlement juvenile black rockfishSebastescheniin a temperate macroalgal bed. A total of 14 fish and environmental surveys were conducted at an interval of one to two weeks from February to May, 2008 in the central Seto Inland Sea, southwestern Japan. The birth date ofS. cheniwas estimated by use of the otolith daily rings and then fish were divided into 7 cohorts (A to F), each covering a 7-day birth date period. Cohort-specific growth coefficient (G, d−1) of juvenileS. chenifrom 20 to 60 mm in total length (TL) ranged between 0.031 and 0.048 and mortality coefficient (M, d−1) between 0.038 and 0.081, with significant increases in both values as the season progressed. The ratio ofG:M, which is a proxy of the recruitment potential, ranged between 0.59 and 0.99 and was lower in later cohorts. Water temperature increased from 10.9 °C in March to 18.2 °C in May and vegetation coverage (bulk volume ofSargassumspp., %: as an index of the function for predation refuge) decreased from 60% in March to 2% in May. The later cohorts of juvenileS. chenihad high growth and mortality rates related to high temperature and low vegetation coverage. Since the seasonal increase inMwas greater than that ofG, the recruitment potential of the later cohorts was lower than that of the earlier cohorts.