| 摘要: |
| 为了解和掌握乐清湾大型底栖动物种类和数量组成特征及变化情况, 本研究于2015年1月、3月、5月、8月和10月进行5 个航次的大型底栖动物调查。结果表明, 乐清湾共有大型底栖动物116种, 环节动物为主要优势类群; 种类组成、栖息密度和生物量在不同航次之间均存在较大幅度的波动;相同航次之间的种类组成、栖息密度和生物量在空间分布也存在明显斑块化。通过对比分析历史研究数据发现乐清湾的大型底栖动物种类和数量组成变化明显, 其中小个体环节动物的种类数和栖息密度明显升高, 而大个体软体动物和棘皮动物的种类数和栖息密度则下降明显。这说明乐清湾底栖生境处于不稳定状态, 需要在长期稳定的生境中生长的大个体动物不能得到充分的生长, 取而代之的是出生率高, 生长周期短的小个体r-对策者的快速繁殖。 |
| 关键词: 乐清湾 大型底栖动物 r-对策者 |
| DOI：10.11759/hykx20170703001 |
| 分类号: |
| 基金项目:浙江省海洋环保与生态项目(浙海渔计[2012]100 号) |
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| The characteristics and changes of the species and quantity of macrobenthos in Yueqing Bay |
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WANG Hang-jun,ZOU Qing,LIU Ya-lin,LIN Yi,LÜ Bao-qiang,YAO Wei-min
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| Abstract: |
| In 2015, five survey cruises were carried out in January, March, May, August and October, respectively, to understand and evaluate the characteristics and changes of the species and quantity of macrobenthos in Yueqing bay. In this study, a total of 116 of macrobenthos species were identified and annelid was the dominant group. The species composition, inhabit density and biomass varied with the season, and the spatial distribution of species always formed patch structure. Compared with previous data, both type and amount of species changed obviously: the amount and inhabit density of small annelids increased significantly, while those of bigger mollusks and echinoderms decreased significantly. Our results indicated that the quite unstable benthic habitats in Yueqing bay led to the decrease of large animals which didn’t have enough time to fully grow, and were replaced by the small r-strategist with high birth rate and short growth cycle. |
| Key words: Yueqing bay macrobenthos r-strategist |
