Spatio-temporal heterogeneity in coral recruitment around Moorea, French Polynesia: Implications for population maintenance
Spatio-temporal heterogeneity in coral recruitment around Moorea, French Polynesia: Implications for population maintenance
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DOI：
10.1016/j.jembe.2006.10.048
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发表时间：
2007-03-05
影响因子：
2
通讯作者：
Carroll, Andrew
中科院分区：
文献类型：
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作者：
Adjeroud, Mehdi;Penin, Lucie;Carroll, Andrew
2000年12月至2003年12月，在莫雷亚岛(法属波利尼西亚)周围调查了珊瑚补充量的时空变异性。在3个地点(Vaipahu、Tiabura、Haapiti)和3个深度(6、12和18米)的外礁斜坡上放置了9个站，每个站有20个陶瓷砖。Moorea记录的不同种类的新兵的相对贡献率(Pocillopidae：60.4%，Poritidae：18.8%，Acroporidae：11.2%)和极低的招聘率(最高：每瓦35名，每瓦10.8名，平均40.77名，m(-2)年(-1))与亚热带珊瑚礁记录的招募模式相似。在研究期间，我们发现招募率有明显的季节性变化，所有家庭的招募高峰期都在12月至3月期间，对应于SST最热的时期。然而，在某些年份的9-12月期间，顶孢子科的新兵数量也相对较多，这与一些顶孢子科物种的已知产卵期相吻合。总补充率在调查的第一年后下降，可能是2002年初发生的漂白事件的结果，这可能降低了一些珊瑚种群的繁殖力。新兵在瓷砖上表面的比例较低(14.5%)，而下表面(57.1%)和侧面(28.4%)较低，这可能是食草性鱼类和海胆密集捕食的结果。我们检测到站点规模上的零星分布，以及不同深度和地点之间的招募模式显著不同。在6米和18米处，柱孔虫科的数量较多，而在12米处，柱孔虫科的数量普遍较多。相反，在研究期间，尖孢子科没有表现出明显的深度格局。在暴露最严重的地点(Haapiti)，招募人数最低，特别是Acroporidae，这可能反映了频繁的高涌浪及其相关的强洋流导致较低的沉降率和/或较高的定居后早期死亡率。3个主要新兵家族在招募模式上的这些独特特征突出表明，生活史战略在了解珊瑚种群的空间格局、动态和维持过程方面发挥了重要作用。这项研究记录的相对较低的珊瑚补充率表明，从严重或频繁的扰动中恢复将是缓慢的。(C)2006爱思唯尔B.V.保留所有权利。
The spatio-temporal variability of scleractinian coral recruitment was investigated from December 2000 to December 2003 around Moorea Island (French Polynesia). Nine stations, each with 20 terracotta tiles, were placed on the outer reef slope, at 3 sites (Vaipahu, Tiabura, Haapiti), and at 3 depths (6, 12 and 18 m). The relative contribution of the different families of recruits (Pocilloporidae: 60.4%, Poritidae: 18.8%, Acroporidae: 11.2%) and the very low recruitment rates (maximum: 35 recruits per tile, higher mean densities of 10.8 recruits per tile, average 40.77 recruits m(-2) year (-1)) recorded at Moorea are similar to recruitment patterns recorded on sub-tropical reefs. Over the duration of the study period, we detected a marked seasonal variability in recruitment rates, with the peak recruitment for all families recorded in December-March periods, corresponding to periods of warmest SSTs. However, recruits of Acroporidae were also relatively abundant in the September-December period in some years, which coincides with the known spawning periods of some Acropora species. Total recruitment rate decreased after the first year of the survey, and was probably the result of the bleaching event that occurred in early 2002, which may have reduced fecundity of some coral populations. A lower proportion of recruits were found on the upper surface of the tiles (14.5%), compared to the lower surfaces (57.1%) and sides (28.4%), which is likely the result of intense grazing by herbivorous fish and urchins. We detected a patchy distribution at the station scale, and a significant variation in recruitment patterns among depths and sites. Pocilloporidae recruited more abundantly at 6 and 18 m, whereas Poritidae were generally more abundant at 12 m depth. In contrast, Acroporidae showed no clear depth pattern during the study period. Recruitment was lowest at the most exposed site (Haapiti), especially for Acroporidae, and probably reflects lower settlement rates and/or higher early post-settlement mortality caused by frequent high swells and their associated strong currents. These distinctive characteristics in recruitment patterns of the 3 dominant families of recruits underline the important role of life history strategies in understanding the spatial patterns, dynamics and maintenance processes of coral populations. The relatively low coral recruitment rates recorded from this study indicate that recovery from severe or frequent perturbations will be slow. (c) 2006 Elsevier B.V All rights reserved.