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首页> 外文期刊>Ocean & coastal management >Spatial variation in the phytoplankton community of the Pemba Channel, Tanzania, during the south-east monsoon
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Spatial variation in the phytoplankton community of the Pemba Channel, Tanzania, during the south-east monsoon

机译：坦桑尼亚Pemba频道浮游植物社区的空间变异，在东南季风期间

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The spatiotemporal distribution of phytoplankton within Tanzanian coastal waters is considered to be poorly known. Improved knowledge of the phytoplankton community, including the spatiotemporal distribution, is desirable for understanding certain aspects of trophic linkages to small pelagic fish, a key marine resource in Tanzania, and for understanding how anthropogenic activities such as terrestrial run-off and effluent discharge may impact the phytoplankton community of these waters. In this study the abundance, diversity and distribution of microphytoplankton was determined throughout the Pemba Channel during the Southeast monsoon and assessed in relation to local environmental parameters. A total of 88 species were identified during this study. Generally, diatoms dominated the microphytoplankton community of the Pemba Channel with 55 identified species (62.5% of total), followed by 31 dinoflagellate species (35.2%) and 2 cyanobacteria species (2.27%). Abundances were low, generally less than 100 cell L-1. Despite a clear dominance by diatoms within the samples, no obvious spatial pattern in their distribution was identified within the channel. Cyanobacteria meanwhile displayed a significant latitudinal gradient being more abundant in the northern half of the channel. Several harmful or potentially harmful phytoplankton species were also identified in this study including Pseudonitzschia sp. and Dinophysis sp., although their abundances were below the thresholds of harmful algal bloom warning systems. Nevertheless, to understand whether these species are increasing with time in response to anthropogenic activities, regular phytoplankton monitoring programs are recommended.
机译：坦桑尼亚沿海水域浮游植物的时空分布被认为是众所周知的不知名。改善了浮游植物群落的知识，包括时尚分布，理解坦桑尼亚的一个关键海洋资源的营养链接的某些方面，以及了解陆地逃逸和出水排放等人的妇生殖活动可能会影响这些水域的浮游植物社区。在这项研究中，在东南季风期间在整个Pemba通道中确定了微粒杆菌的丰富，多样性和分布，并与局部环境参数进行评估。本研究期间共鉴定了88种。通常，硅藻占PEMBA通道的脑脊液群落，55种鉴定物种（总量的62.5％），其次是31种Dinoflagellate物种（35.2％）和2种蓝色细菌物种（2.27％）。丰度低，通常小于100个细胞L-1。尽管样品中的硅藻的优势占据了明显的优势，但在通道内没有明显的空间模式。同时，Cyanobacteria在渠道的北半部分中显示出显着的纬度梯度。在本研究中还发现了几种有害或潜在有害的植物物种，包括Pseudonitzschia sp。和Dinophys SP。，尽管它们的丰富低于有害藻类盛开警告系统的阈值。然而，为了了解这些物种是否随着时间的推移而增加，建议使用普通的浮游植物监测计划。

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