阿曼海(阿拉伯海)浮游微动物群落的季节动态

IF 0.8 4区 环境科学与生态学 Q4 ENVIRONMENTAL SCIENCES Aquatic Ecosystem Health & Management Pub Date : 2019-04-03 DOI:10.1080/14634988.2019.1617002
N. Aberle, S. Piontkovski
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引用次数: 2

摘要

在为期一年的阿曼海两个不同站点的实地采样活动中,分析了微型浮游动物的季节性动态和环境条件的变化。夏季(6月至10月)西南季风期和冬季(11月至3月)东北季风期的初级生产力较高。阿曼海浮游微动物全年出现几个生物量高峰。总的来说,与东北季风期相比,西南季风期的生物量更高,在近岸站Bandar Al-Khyran水深1米处的生物量最大值为190µg C l- 1,在水深10米处的生物量最大值为308µg C l- 1。在近海站,372µg C l−1 (1m)和256µg C l−1 (20m)的峰值出现在西南季风期间。在季风期浮游植物和浮游微动物之间存在强烈的耦合,但一些浮游微动物在季风间期叶绿素浓度较低时达到峰值(Bandar Al-Khyran: 1m处372µg C l−1,10m处196µg C l−1;海上站:419µg C l−1,20 m)。由于西南和东北季风期间强烈的季节性养分流入,阿曼海浮游植物华的开始受到自下而上的控制。微浮游动物生物量在季风期最高,以夜luciphyae类为主,在Bandar Al-Khyran (1m)和5942µg C l- 1 (10m)处达到峰值,分别为7596µg C l- 1。桡足类、变形虫和幼虫对全年的浮游动物生物量贡献很大。纤毛虫对总浮游微动物生物量的贡献在季风期和季风间期均较低。在春季季风间期,富纤纤毛虫(tintinids)在Bandar Al-Khyran (1m)和近海站(20m)分别表现出15.9µg C l−1和17.7µg C l−1的峰值。自下而上控制的初级生产和自上而下控制机制之间的相互作用调节了阿曼海特定微型浮游动物群体的物候模式,从而指出了这个低纬度生态系统中最低食物网水平上复杂的滋养动力学相互作用。
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Seasonal dynamics of microzooplankton communities in the Sea of Oman (Arabian Sea)
Seasonal dynamics of microzooplankton and changes in environmental condition were analysed during a one-year field sampling campaign in the Sea of Oman at two different stations. Monsoon winds in this region cause distinct seasonality patterns with high primary productivity during the south-west monsoon in summer (June to October) and north-east monsoon periods in winter (November to March). Microzooplankton in the Sea of Oman showed several biomass peaks throughout the year. In general, higher biomass occurred during the south-west monsoon when compared to the north-east monsoon period with maxima of 190 µg C l−1at the inshore station Bandar Al-Khyran at 1m and 308 µg C l−1 at 10m water depth. At the offshore-station, peaks of 372 µg C l−1 (1m) and 256 µg C l−1 (20m) occurred during the south-west monsoon. A strong coupling between phytoplankton and microzooplankton was observed during monsoon periods but some microzooplankton peaked during inter-monsoon periods when chlorophyll concentration was low (Bandar Al-Khyran: 372 µg C l−1 at 1m and 196 µg C l−1, 10m; Offshore-station: 419 µg C l−1, 20 m). The initiation of phytoplankton blooms in the Sea of Oman was bottom-up controlled due to strong seasonal nutrient influx during south-west and north-east monsoon periods. Highest microzooplankton biomass occurred during monsoon periods with a dominance of Noctiluciphyceae and peaks of 7596 µg C l−1 at Bandar Al-Khyran (1m) and 5942 µg C l−1 (10m). Copepod nauplii, Amoebozoa and Larvacea contributed substantially to microzooplankton biomass throughout the year. Ciliophora contributed low proportion to the total microzooplankton biomass peaking both during monsoon and inter-monsoon periods. During the spring inter-monsoon, choreotrich ciliates (tintinnids) showed distinct peaks of 15.9 µg C l−1 at Bandar Al-Khyran (1m) and 17.7 µg C l−1 (10m) as well as 18.2 µg C l−1 at Offshore-station (20m). The interplay between bottom-up controlled primary production and top-down control mechanisms regulates the phenology patterns of specific microzooplankton groups in the Sea of Oman thus pointing at complex trophodynamic interactions at the lowermost foodweb level in this low-latitude ecosystem.
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来源期刊
Aquatic Ecosystem Health & Management
Aquatic Ecosystem Health & Management 环境科学-海洋与淡水生物学
CiteScore
1.70
自引率
0.00%
发文量
1
审稿时长
18-36 weeks
期刊介绍: The journal publishes articles on the following themes and topics: • Original articles focusing on ecosystem-based sciences, ecosystem health and management of marine and aquatic ecosystems • Reviews, invited perspectives and keynote contributions from conferences • Special issues on important emerging topics, themes, and ecosystems (climate change, invasive species, HABs, risk assessment, models)
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