First mesophotic Ecklonia radiata (Laminariales) records within the iSimangaliso Wetland Park marine-protected area, east coast, South Africa

IF 1.1 4区 生物学 Q3 MARINE & FRESHWATER BIOLOGY
Welly Qwabe, Toufiek Samaai, Jean M. Harris, Ryan M. Palmer, Sven E. Kerwath
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引用次数: 0

Abstract

A dense Ecklonia radiata (Laminariales) kelp forest extending at least 35 km has been found between 45 and 60 m depth range within the mesophotic zone inside the iSimangaliso marine-protected area (MPA) at the iSimangaliso Wetland park World Heritage Site on the east coast of South Africa. This is the first visual confirmation of the occurrence of E. radiata beds in subtropical South Africa, in an area situated between the tropical and subtropical bioregions, in an area that spans the Natal and Delagoa bioregions of the south-western Indian Ocean, more than 350 km north of its previously documented South African range. The kelp was found to be present across the length of the MPA, but dense beds were present only in the southern Natal bioregion, with sparse occurrences observed elsewhere on soft-coral and sponge-dominated reefs in the upper mesophotic zone. The footage was collected in November 2020, May 2021 and November 2022 during remotely operated vehicle and drop camera surveys of the mesophotic zone inside the MPA. This discovery adds to the body of knowledge on the global distribution of Laminariales populations in deep tropical and subtropical settings and the diversity of habitats within South Africa's largest coastal MPA.
南非东海岸iSimangaliso湿地公园海洋保护区内最早的中鳍藻辐射Ecklonia radiata (Laminariales)记录
在南非东海岸世界遗产iSimangaliso湿地公园的iSimangaliso海洋保护区(MPA)的中间地带,在45至60米深度范围内,发现了一片茂密的辐射Ecklonia (Laminariales)海带森林,延伸至少35公里。这是首次从视觉上证实在南非亚热带地区存在辐射绦虫床,该地区位于热带和亚热带生物区之间,横跨印度洋西南部的纳塔尔和德拉戈阿生物区,比以前记录的南非范围以北350多公里。海带遍布整个海洋保护区,但密集的海带只出现在纳塔尔生物区的南部,在其他地方的软珊瑚和中厚带上部的海绵为主的珊瑚礁上观察到稀疏的现象。这段视频是在2020年11月、2021年5月和2022年11月对MPA内中磷灰岩区的远程遥控车辆和摄像机调查期间收集的。这一发现增加了对热带和亚热带深层环境中海带种群的全球分布以及南非最大的沿海海洋保护区栖息地多样性的知识体系。
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来源期刊
CiteScore
2.30
自引率
8.30%
发文量
68
审稿时长
3-8 weeks
期刊介绍: JMBA is an international journal, publishing original research on all aspects of marine biology. It includes pioneering work taking place today on major issues concerning marine organisms and their environment. Subjects covered include: ecological surveys and population studies of marine communities; physiology and experimental biology; taxonomy, morphology and life history of marine animals and plants; and chemical and physical oceanographic work. Included with 2010 online subscriptions: Marine Biodiversity Records.
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