| SONG Puqing,LIN Longshan,LI Yuan,ZHONG Zhihui. 2016. Spatial structure and seasonal changes of nekton assemblages in the Taiwan Strait. Acta Oceanologica Sinica, 35(6):59－67 |
| Spatial structure and seasonal changes of nekton assemblages in the Taiwan Strait |
| 台湾海峡游泳动物群落的空间结构及其季节变化 |
| Received:January 27, 2015 Revised:November 18, 2015 |
| DOI：10.1007/s13131-016-0843-8 |
| Key words:nekton assemblages species composition spatial structure transition zone Taiwan Strait |
| 中文关键词: 游泳动物群落 种类组成 空间结构 过渡区域 台湾海峡 |
| 基金项目: |
| Author Name | Affiliation | E-mail | | SONG Puqing | The Third Institute of Oceanography, State Oceanic Administration, Xiamen 361005, China | | | LIN Longshan | The Third Institute of Oceanography, State Oceanic Administration, Xiamen 361005, China | linlsh2005@126.com | | LI Yuan | The Third Institute of Oceanography, State Oceanic Administration, Xiamen 361005, China | | | ZHONG Zhihui | The Third Institute of Oceanography, State Oceanic Administration, Xiamen 361005, China | |
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| Abstract: |
| The Taiwan Strait is a transition zone between the East China Sea and the South China Sea with unique hydrology and a geographical environment that creates special marine community features. To analyze the spatial structure and seasonal changes of the nekton assemblages in the Taiwan Strait, seasonal experimental trawl surveys were conducted during 2006-2007. The results showed that there were two assemblages in the area with different sets of species, and the average similarity within each group varies between 39.38% and 74.20%. By using multivariate statistical analysis and analyzing the distribution of dominant species, we found that the structures of the assemblages had obvious seasonal variation. The middle region from the Putian transect to the Xiamen transect could be considered a mixing area for the two assemblages. The analysis of the relationship between species assemblages and environmental factors indicated that temperature was the most important factor affecting the community structure in cold seasons, and 22.5℃ and 17℃ could be considered dividing lines for spring and winter, respectively. In warm seasons, the most important factor was water depth, but the relationship with depth was not as significant, with a correlation between 0.264 and 0.399. The seasonal changes of nekton assemblages basically reflected the dynamic currents in the Taiwan Strait. The south coastal assemblage extended to nearly the entire area of the Taiwan Strait along with a strong and intense warm current that shrinks in spring and winter when the southward intrusion of the cold Zhejiang-Fujian coastal current becomes stronger. The impact of short-term and long-term environmental changes, such as extreme weather, global warming and human activity on nekton assemblages, had been recognized but need further research. Our study on nekton assemblages could be used as a baseline for measuring future changes. |
| 中文摘要: |
| 台湾海峡是连接东海和南海的过渡区域,拥有独特的水文地理环境和特殊的生物群落组成。为了分析台湾海峡游泳动物群落的空间结构及其季节变化,2006-2007年在该区域进行了四个季节的底拖网调查。分析结果表明,在该海域存在两个种类组成差异明显的群聚类型,组内平均相似性在39.38到74.20之间。对其优势种类的分布及变化分析表明,该海域的游泳动物群落结构存在明显的季节变化,莆田至厦门之间的海域可以认为是两个不同群聚类型的混合区域。对群落结构与环境因子的关系分析表明,温度在冷季(冬季和春季)是群落结构最重要的影响因素,22.5℃和17℃分别是春季和冬季两个群落类型的分界线。在暖季(夏季和秋季)对群落结构最重要的影响因素是水深,但是其关系也不显著,相关系数在0.264至0.399之间。游泳动物群落结构的季节变化反应了台湾海峡水团的变化,在夏季随着暖流的强盛,南部近岸群落几乎可以扩展至整个台湾海峡,而在春季和冬季,随着浙闽沿岸流的强盛南部近岸群落的分布范围逐渐向南退缩。极端天气、全球变暖以及人类活动等短期和长期的因素都会影响游泳动物群落结构,但是其影响机制和程度还需要进一步的研究,我们对台湾海峡游泳动物群落结构及其季节变动的分析可以为今后的研究提供本底数据和资料。 |
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