Sonar and in situ surveys of eelgrass distribution, reproductive effort, and sexual recruitment contribution in a eutrophic bay with intensive human activities: Implication for seagrass conservation

doi:10.1016/j.marpolbul.2020.111706

	Sonar and in situ surveys of eelgrass distribution, reproductive effort, and sexual recruitment contribution in a eutrophic bay with intensive human activities: Implication for seagrass conservation
	Xu, Shaochun1,2,3,4,5 ; Xu, Shuai 1,2,3,4,5; Zhou, Yi1,2,3,4,5 ; Yue, Shidong 1,2,3,4,5; Qiao, Yongliang 1,2,3,4,6; Liu, Mingjie 1,2,3,4,5; Gu, Ruiting 1,2,3,4,5; Song, Xiaoyue 1,2,3,4,5; Zhang, Yu 1,2,3,4,5; Zhang, Xiaomei1,2,3,4,5
	2020-12-01
发表期刊	MARINE POLLUTION BULLETIN
ISSN	0025-326X
卷号	161 页码:14
通讯作者	Zhou, Yi(yizhou@qdio.ac.cn)
摘要	Seagrass beds are recognized as pivotal and among the most vulnerable coastal marine ecosystems globally. The eelgrass Zostera marina L. is the most widely distributed seagrass species and dominates the temperate northern hemisphere. However, an alarming decline in seagrass has been occurring worldwide due to multiple stressors. Seagrass meadow degradation is particularly serious in the Bohai Sea, in temperate China; however, large areas (> 500 ha) of seagrass meadows and population recruitment have rarely been reported in this area. In the present study, we report on a large eelgrass bed in a eutrophic bay of the Bohai Sea. Sonar and field survey methods were used to investigate the distribution of seagrass and its population recruitment. We also analyzed the major threats to this large seagrass bed. Results showed that a large Z. marina bed with an area of 694.36 ha occurred in this area of the Bohai Sea, with a peripheral area of similar to 25 km(2). Seagrass canopy height and plant coverage had a significant correlation with water depth. Asexual reproduction principally occurred in autumn and played a dominant role in population recruitment in vegetated areas, where no seedlings successfully colonized. In contrast, a considerable number of seedlings survived in the seagrass meadow gaps, and thus played a critical role in the recruitment in these areas. The maximum reproductive shoot densities were about 100 and 70 shoots m(-2) at sampling site (S)-1 and S-2 in 2018, respectively, which was about two times more than in 2019 (50 and 20 reproductive shoots m(-2) at S-1 and S-2, respectively). The potential seed output per unit area in 2019 was about 1020 seeds m(-2) at S-1 and 830 seeds m(-2) at S-2, and the seed output in the study area was at a low level compared with global values. Overall, high spring and summer water temperature appeared to induce sexual reproduction of Z. marina in the study area, including reproductive effort, reproductive investment, and seedling development. Furthermore, eelgrass height, aboveground biomass, and density were significantly related to water temperature. Among the potential threatening factors to seagrass in this area, the activities of clam harvesting were intense with daily clam catches > 2000 kg, leading to patchy seagrass meadows, especially in the fringe areas. The seagrass bed was also threatened by marine pollution (nutrient loading) and land reclamation. Therefore, the protection and restoration of this seagrass bed are strongly recommended. Our study will provide fundamental information for the conservation and management strategies of large eelgrass beds in the Bohai Sea.
关键词	Zostera marina L. Bohai Sea Seagrass distribution Single beam echosounder Sexual reproduction Population recruitment Resilience Conservation
DOI	10.1016/j.marpolbul.2020.111706
收录类别	SCI
语种	英语
资助项目	National Key Research and Development Program of China[2019YFD0901301] ; National Science & Technology Basic Work Program[2015FY110600] ; Key Research Project of Frontier Sciences of CAS[QYZDB-SSW-DQC041-1] ; Taishan Scholar Project of Shandong Province
WOS研究方向	Environmental Sciences & Ecology ; Marine & Freshwater Biology
WOS类目	Environmental Sciences ; Marine & Freshwater Biology
WOS记录号	WOS:000600320100008
出版者	PERGAMON-ELSEVIER SCIENCE LTD
引用统计	被引频次：12[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/169893
专题	海洋生态与环境科学重点实验室
通讯作者	Zhou, Yi
作者单位	1.Chinese Acad Sci, Inst Oceanol, CAS Key Lab Marine Ecol & Environm Sci, Qingdao 266071, Peoples R China 2.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Ecol & Environm Sci, Qingdao 266237, Peoples R China 3.Chinese Acad Sci, Ctr Ocean Megasci, Qingdao 266071, Peoples R China 4.Chinese Acad Sci, Inst Oceanol, CAS Engn Lab Marine Ranching, Qingdao 266071, Peoples R China 5.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 6.Qingdao Univ Sci & Technol, Qingdao 266000, Peoples R China
第一作者单位	海洋生态与环境科学重点实验室; 中国科学院海洋大科学研究中心; 中国科学院海洋研究所
通讯作者单位	海洋生态与环境科学重点实验室; 中国科学院海洋大科学研究中心; 中国科学院海洋研究所
推荐引用方式 GB/T 7714	Xu, Shaochun,Xu, Shuai,Zhou, Yi,et al. Sonar and in situ surveys of eelgrass distribution, reproductive effort, and sexual recruitment contribution in a eutrophic bay with intensive human activities: Implication for seagrass conservation[J]. MARINE POLLUTION BULLETIN,2020,161:14.
APA	Xu, Shaochun.,Xu, Shuai.,Zhou, Yi.,Yue, Shidong.,Qiao, Yongliang.,...&Zhang, Xiaomei.(2020).Sonar and in situ surveys of eelgrass distribution, reproductive effort, and sexual recruitment contribution in a eutrophic bay with intensive human activities: Implication for seagrass conservation.MARINE POLLUTION BULLETIN,161,14.
MLA	Xu, Shaochun,et al."Sonar and in situ surveys of eelgrass distribution, reproductive effort, and sexual recruitment contribution in a eutrophic bay with intensive human activities: Implication for seagrass conservation".MARINE POLLUTION BULLETIN 161(2020):14.

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