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Downslope migration of free-living corals (Scleractinia: Fungiidae) in typhoon-exposed reef habitats at Okinawa, Japan
Marine Environmental Research ( IF 3.3 ) Pub Date : 2021-08-08 , DOI: 10.1016/j.marenvres.2021.105445
Taku Ohara 1 , Bert W Hoeksema 2 , Hin Boo Wee 3 , James D Reimer 4
Affiliation  

Offshore Onna Village, Okinawa Island, Japan, there is a large and densely covered coral assemblage of free-living mushroom corals (Scleractinia: Fungiidae) on a reef slope at depths from 20 m to 32 m, covering an area of approximately 350 × 40 m2. From previous research, it is known that migration distances of mushroom corals may depend on coral shapes, coral sizes, substrate, and bottom inclination. However, until now there have been no published examples of regular Fungiidae movement and behavior from typhoon-exposed coastlines, such as those in the western Pacific Ocean. Our surveys across three years offshore Onna Village show that mushroom corals always move in down-slope direction from shallow to deeper reef zones. The results indicated that mushroom corals migrated faster in autumn than in other seasons, and that oval-elongate fungiids, and particularly those with a smooth underside, migrated more quickly than species with other shapes. Surprisingly, we observed a negative relationship between the presence of typhoons and migration rates. We also observed active migration by fungiid individuals to escape situations in which they were threatened to become overgrown by Acropora corals, or when they needed to escape from burial underneath coral debris.



中文翻译:

日本冲绳受台风影响的珊瑚礁栖息地中自由生活珊瑚(Scleractinia:Fungiidae)的下坡迁移

日本冲绳岛近海恩纳村,在 20 m 至 32 m 深处的礁坡上,有一大片茂密的自由生活蘑菇珊瑚(Scleractinia:Fungiidae)珊瑚组合,面积约为 350 × 40米2. 从之前的研究中可知,蘑菇珊瑚的迁徙距离可能取决于珊瑚形状、珊瑚大小、基质和底部倾斜度。然而,到目前为止,还没有公开的关于真菌科在遭受台风影响的海岸线(例如西太平洋的海岸线)的定期运动和行为的例子。我们对恩纳村近海三年的调查表明,蘑菇珊瑚总是从浅礁区向深礁区向下倾斜方向移动。结果表明,蘑菇珊瑚在秋季的迁移速度比其他季节要快,椭圆形的菌类,尤其是底部光滑的,比其他形状的物种迁移速度更快。令人惊讶的是,我们观察到台风的存在与迁移率之间存在负相关关系。鹿角珊瑚,或当他们需要从下面埋葬珊瑚碎片逃脱。

更新日期:2021-08-12
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