ECOLOGY OF A CARIBBEAN CORAL REEF - PORITES REEF-FLAT BIOTOPE .2. PLANKTON COMMUNITY WITH EVIDENCE FOR DEPLETION
ECOLOGY OF A CARIBBEAN CORAL REEF - PORITES REEF-FLAT BIOTOPE .2. PLANKTON COMMUNITY WITH EVIDENCE FOR DEPLETION
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DOI：
10.1007/bf00388905
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发表时间：
1973-01-01
期刊：
影响因子：
2.4
通讯作者：
GLYNN, PW
中科院分区：
文献类型：
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作者：
GLYNN, PW
在加勒比海的一个珊瑚礁上，对漂网浮游生物穿越一个礁滩生物群落进行了定量评估。对浮游生物的空间分布和丰度进行采样，以估计悬浮摄食种群对这种潜在食物资源的消耗。取样主要局限于月桂礁的礁滩和邻近水域，月桂礁是波多黎各西南部岛屿大陆架上一个繁盛的珊瑚礁。先前的一项研究提供了有关该地区气象和水文特征的资料。在人口稠密的珊瑚礁群落下游取样的质量相似的种群数量的减少中发现了浮游生物增加的证据。从数字上看，从珊瑚礁流出的水流中，硅藻作物减少了91%，浮游动物减少了60%。浮游生物丰度存在显著的昼夜和季节变化，体积流量也存在显著差异，后者与当地风况密切相关。考虑到这些因素，计算了净浮游生物的时间过程。夏季（7 ~ 8月）浮游动物相对丰富，礁上水流运动旺盛，浮游生物总收益达到~ 0.25 gC/m2/d；其中75%发生在日出和日落的4小时内。1、2月和9月浮游生物在礁滩上的滞留量约为0.1 g C/m2/天。浮游动物生物量贡献最大，白天是硅藻生物量的10倍，傍晚是硅藻生物量的42倍。平均每年增加0.18 g C/m2/天，相当于净群落代谢的4 - 13%。
A quantitative assessment of drifting net plankton crossing a reef-flat biotope was obtained on a Caribbean coral reef. The spatial distribution and abundance of plankton were sampled to provide estimates of the removal of this potential food resource by suspension-feeding populations. Sampling was largely confined to the reef flat and adjacent waters of Laurel Cay, a flourishing coral reef present on the insular shelf off southwestern Puerto Rico. A prior study provides information on the meteorological and hydrographic characteristics of this area. Evidence for plankton accrual was found in the quantitative depletion of qualitatively similar populations sampled downstream of densely populated reef communities. Numerically, the diatom crop was reduced by 91% and zooplankton by 60% in water streaming off the reef. Significant diel and seasonal variations in plankton abundance were obcerved, as well as notable differences in volume flow, the latter closely related to the local wind regime. A time course of net plankton accrual was calculated, taking into account these various factors. During the summer season (July–August), when zooplankton was relatively abundant and water movement over the reef vigorous, the total gain from plankton reached ∼0.25 gC/m2/day; 75% of this occurred during a 4 h period at sunrise and sunset. Plankton retained on the reef flat in January of February and in September was around 0.1 g C/m2/day. Zooplankton biomass contributed the greatest share, exceeding that of diatoms by a factor of 10 during the day and 42 in the early evening. A mean annual accrual of 0.18 g C/m2/day is equivalent to 4 to 13% of net community metabolism.