Transitions in coral communities over 17 years in the Sekisei Lagoon and adjacent reef areas in Okinawa, Japan
Transitions in coral communities over 17 years in the Sekisei Lagoon and adjacent reef areas in Okinawa, Japan
复制标题
DOI：
10.1111/1440-1703.12013
复制
发表时间：
2019-07-01
影响因子：
2
通讯作者：
Nadaoka, Kazuo
中科院分区：
文献类型：
--
作者：
Muko, Soyoka;Suzuki, Go;Nadaoka, Kazuo
长期监测揭示了珊瑚群落对多种干扰的反应，这使我们能够追踪它们的轨迹。通过对从196个研究点收集的监测数据的分析，我们评估了2000至2017年间日本冲绳关城泻湖及邻近地区珊瑚群落的状况。利用分类聚类法，我们将这些地点的珊瑚盖度按五个类别进行了排序：(A)高、(B)中、(C)低、(D)迅速增加和(E)未恢复的珊瑚盖度。我们还确定了按优势种划分的群落类型的组成，并计算了Acropora spp的平均数量。每组均为青少年。由于2007年和2016年发生的漂白事件，珊瑚覆盖率排名出现了严重下降。虽然其他组的珊瑚覆盖率在2007年事件后慢慢恢复到以前的水平，但占所有地点31%的组5没有恢复到以前的水平。第5组地点主要分布在关城泻湖中南部和石垣岛沿岸，以Acropora spp.为主，更容易受到干扰。Acropora幼虫的中间数量也可能阻碍了第5组地点珊瑚的恢复。我们的研究表明，珊瑚群落组成，特别是Acropora spp.因此，在预测珊瑚群落对气候变化情景的反应时，应考虑珊瑚群落的反应。
Long-term monitoring reveals coral community responses to multiple disturbances that allow us to track their trajectories. We assessed the status of coral communities between 2000 and 2017 in the Sekisei Lagoon and adjacent areas in Okinawa, Japan, using an analysis of monitoring data collected from 196 research sites. Using categorical clustering, we ranked the coral cover in the sites according to five groups: (a) high, (b) intermediate, (c) low, (d) rapidly increasing and (e) unrecovered coral cover. We also identified the composition of assemblage types that were categorized according to the dominant species, and calculated the mean number of Acropora spp. juveniles for each group. Severe declines in the coral cover ranking were observed in response to bleaching events in 2007 and 2016. Although the coral cover rank of the other groups slowly returned to previous levels after the 2007 event, group 5, which accounted for 31% of all sites, did not. Group 5 sites were mainly located in the middle and southern area of the Sekisei Lagoon and along the Ishigaki Island, and were dominated by the Acropora spp., that are more susceptible to disturbances. The intermediate number of Acropora juveniles may also have hindered the recovery of corals in group 5 sites. Our study demonstrated that the coral community composition, in particular the proportion of Acropora spp. and juvenile recruitment, influenced the trajectory of coral cover and, therefore, should be considered when predicting the response of coral communities to climate change scenarios.