Seasonal dynamics influencing coastal primary production and phytoplankton communities along the southern Myanmar coast
Seasonal dynamics influencing coastal primary production and phytoplankton communities along the southern Myanmar coast
复制标题
影响缅甸南部沿海初级生产和浮游植物群落的季节动态
DOI：
10.1007/s10872-016-0408-7
复制
发表时间：
2017
影响因子：
2.3
通讯作者：
Koike K
中科院分区：
文献类型：
--
作者：
Maung-Saw-Htoo-Thaw;Ohara S;Matsuoka K;Yurimoto T;Higo S;Khin-Ko-Lay;Win-Kyaing;Myint-Shwe;Sein-Thaung;Yin-Yin-Htay;Nang-Mya-Han;Khin-Maung-Cho;Si-Si-Hla-Bu;Swe-Thwin;Koike K
缅甸在世界鱼类生产国中排名第十，在东盟（东南亚国家联盟）中排名第三。为了了解高产量背后的机制，在丹老市附近的一个活跃渔场附近进行了海洋学和浮游植物调查，包括基于脉冲幅度调制荧光测定法的初级生产力测量。三项调查，每个代表性季节进行一项，涵盖典型的沿海环境，显示初级生产和浮游植物发生的明确季节性。旱季结束时生产力最高，生产力为 2.59 ± 1.56 g C m−2day−1，叶绿素浓度高（3.14 ± 2.64 µg L−1）。在这个季节，浮游植物种群以高密度硅藻 Bellerochea horologicalis 和 Chaetoceros curvisetus 为主，而旱季开始时初级生产力较低，为 1.36 ± 0.77 g C m−2day−1。然而，这种低初级生产力可以通过源自高溶解有机碳的微生物食物链的激活来补偿。雨季产量最低，为旱季末的 6.6%，原因是河流大量排放浊水，降低了透光层深度，导致漫反射系数异常高，为 2.30 ± 1.03 m−1。此次浑水事件可能与森林砍伐和红树林退化造成的水土流失有关。这项研究揭示了缅甸沿海生产力的季节性趋势及其与热带季风气候的关系，并强调了热带沿海环境对渔业可持续性的重要性。
Myanmar is tenth among the world’s fish-producing countries and third in ASEAN (Association of Southeast Asian Nations). To understand the mechanisms underlying the high production, oceanographic and phytoplankton surveys, including primary productivity measurements based on pulse amplitude modulation fluorometry, were conducted near an active fishing ground near Myeik City. Three surveys, one in each of the representative seasons and covering the characteristic coastal environments, showed well-defined seasonality in primary production and phytoplankton occurrence. End of the dry season was the most productive, with productivity of 2.59 ± 1.56 g C m−2day−1and high concentration of chlorophylla(3.14 ± 2.64 µg L−1). In this season, the phytoplankton population was dominated by high densities of the diatomsBellerochea horologicalisandChaetoceros curvisetus, whereas primary productivity was low at the onset of the dry season, 1.36 ± 0.77 g C m−2day−1. However, this low primary production might be compensated by activation of microbial food chains originating from high dissolved organic carbon. The rainy season exhibited the lowest production, 6.6% of the end of the dry season, due to the extensive discharge of turbid water from the rivers which lowered euphotic layer depth and resulted in an unusually high diffuse attenuation coefficient of 2.30 ± 1.03 m−1. This incident of turbid water may be related to soil erosion from deforestation and mangrove deterioration. This research reveals the seasonal trend in Myanmar’s coastal productivity and its relationship to the tropical monsoon climate as well as emphasizing the importance of tropical coastal environments to the sustainability of the fisheries.