Influence of the monsoon climate on the distribution of neuston copepods in the Northeastern Indian ocean |
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Authors: | A K Heinrich |
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Institution: | (1) Key Laboratory of Tibetan Environment Changes and Land Surface Processes, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, 100085 Beijing, China;(2) National Climate Center, 100081 Beijing, China;(3) Graduate University of Chinese Academy of Sciences, 100049 Beijing, China;(4) State Key Laboratory of Cryospheric Science, Chinese Academy of Sciences, 730000 Lanzhou, China;(5) Shanxi Meteorological Bureau, 030002 Taiyuan, China;(6) College of Atmospheric Science, Nanjing University of Information Science Technology, 210044 Nanjing, China; |
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Abstract: | The horizontal distribution of the near-surface (neuston) copepods of the family Pontellidae was studied on the meridional
transects through the central part of the Indian ocean between 12°N and 12°S and in the Bay of Bengal in the summer monsoon
period. Eleven species of neuston pontellids were found. The common species Labidocera detruncate and Pontellopsis villosa have the sane high frequencies in the central part of the ocean and in the Bay of Bengal. Some species are rarer in the Bay
of Bengal than in the central part of the ocean. In contrast, other species are more frequent in the Bay of Bengal. The special
traits of the distribution in the Bay of Bengal coincide with the lower salinity in the bay than in the central ocean. The
distribution of some neritic species from the Bay of Bengal to the south is dependent on the intensification of the water
translocation to the south in the summer. In the central part of the Indian Ocean, the distribution of the common neustonic
pontellids is similar in the periods of the summer and winter monsoons. It is the result of the occupation of the region by
the same equatorial water masses. |
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