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Surface cyclopoid copepod assemblages in relation to environmental conditions near undisturbed coral reefs of Minicoy, southeastern Arabian Sea, a part of the Indian Ocean
Marine Ecology ( IF 1.5 ) Pub Date : 2020-11-06 , DOI: 10.1111/maec.12619
Radhika Radhakrishnan 1 , Santu Kuzhikandathil Sunny 1 , Bijoy Nandan Sivasankaran 1 , Harikrishnan Mahadevan 2
Affiliation  

The cruise conducted in the spring inter‐monsoon (pre‐monsoon) of April 2015 in the frame of a funded project epitomized an open ocean survey that allowed procuring a quasi‐synoptic picture of cyclopoid copepod community structure in 18 open ocean stations of the Minicoy Island, Lakshadweep archipelago, off the southwestern Indian coast, based on the analysis of standing stock and composition in the integrated 0–10 m water column. The main objective was to explore the community structure of cyclopoid copepods prevailing here and which environmental variable influences the same. It is witnessed that sea surface temperature (SST) (30.42 ± 0.19°C), sea surface salinity (SSS) (33.56 ± 1.15 psu), and dissolved oxygen (DO) (4.32 ± 0.06 ml/L) with SSS and DO are the best matching variables diversifying cyclopoid copepod species (av. abundance 700 ± 386 no. of individuals/100 m3). Average zooplankton biomass (0.03 ml/m3) and abundance (8,989 ± 3,866 no. of individuals/100 m3) were also observed. Fifty‐one cyclopoid copepod species belonging to four families and seven genera were identified, with the dominance of high saline species such as Sapphirina, Copilia, Farranula, and Oncaea. An abundance biomass curve (ABC) plot analysis indicated an undisturbed community with normal environmental conditions. TAXDTEST (taxonomic distinctness) depicted a diverse condition where all points clustered together within a 95% confidence level. Our results indicate that the cyclopoid copepod assemblage near Minicoy Island is a diverse, undisturbed community and hypothesize that the stable environmental conditions during pre‐monsoon (spring inter‐monsoon) preferred the diversification of cyclopoid copepods with the prevalence of high saline species. The data evolved could be used as a standard reference/benchmark to detect any deviation from an undisturbed/diverse community status of Minicoy Island in the looming scenario of climate change in and around the Indian Ocean.

中文翻译:

与印度洋一部分阿拉伯海东南部米尼科尼未受干扰的珊瑚礁附近的环境条件有关的表面摆线足足pe足类组合

2015年4月的春季季风(季风前)期间,在一个受资助项目的框架内进行的巡游以公开海洋调查为代表,该调查使人们能够在Minicoy的18个公开海洋站获得类斜足类co足类群落结构的准天气图片基于印度洋西南海岸附近的Lakshadweep群岛,该岛基于对0-10 m集成水柱中的存量和组成的分析。主要目的是探索这里普遍存在的摆线足co足类的群落结构,以及受其影响的环境变量。可以看出,采用SSS和DO的海面温度(SST)(30.42±0.19°C),海面盐度(SSS)(33.56±1.15 psu)和溶解氧(DO)(4.32±0.06 ml / L)为最佳匹配变量,使环足类id足类物种多样化(av。丰度700±386号 人口/ 100 m3)。还观察到平均浮游动物生物量(0.03 ml / m 3)和丰富度(8,989±3,866个体数量/ 100 m 3)。鉴定出属于四个科和七个属的五十一种独眼类co足类,其中高盐度物种如蓝宝石,科皮利亚,法拉努拉Oncaea占优势。丰富的生物量曲线(ABC)图分析表明,正常环境条件下的社区不受干扰。TAXDTEST(分类学上的独特性)描述了一种多样的情况,其中所有点都在95%的置信度内聚集在一起。我们的研究结果表明,米尼科伊岛附近的摆线足co足类种群是一个不受干扰的多样化群落,并假设在季风前(春季季风)期间稳定的环境条件倾向于以高盐度物种盛行的摆线足爪足类动物的多样化。演化后的数据可以用作标准参考/基准,以检测在印度洋及其周边地区气候变化迫在眉睫的情况下,Minicoy Island不受干扰/多样化的社区状况的任何偏差。
更新日期:2020-12-21
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