气候变化领域集成服务门户(CCPortal): Lakeshore areas of conservation interest: Characteristics of nursery areas of the threatened lake-dwelling grayling, Thymallus thymallus

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DOI	10.1002/aff2.158
	Lakeshore areas of conservation interest: Characteristics of nursery areas of the threatened lake-dwelling grayling, Thymallus thymallus
	Lehtonen, Topi K.; Hirvonen, Esa; Kolari, Irma; Ropponen, Janne; Nyholm, Kristiina; Keskinen, Tapio; Vehanen, Teppo
发表日期	2024
ISSN	2693-8847
起始页码	4
结束页码	2
卷号	4 期号:2
英文摘要	Research-based knowledge is essential for effective conservation and restoration of threatened aquatic species and habitats. Here, our aim was to gather this knowledge on the lake-dwelling grayling (Thymallus thymallus), typically a riverine fish. Such atypical populations are particularly vulnerable to anthropogenic impacts, including fishing pressure, climate change, eutrophication and waterway construction, some of which affect especially the early life stages. However, there is little information available to guide management and conservation of grayling in lakes. Accordingly, we assessed characteristics of the nursery areas in the threatened grayling population of Lake Puruvesi (eastern Finland). In particular, we used beach seines in two consecutive years to sample lakeshore sites (including islands) that were a priori presumed suitable for grayling. We assessed the occurrence of grayling fry (larvae and post-larvae <40 mm in length) regarding depth, year, the site's exposure (fetch), bottom shear stress, substrate coarseness and shoreline's north-south orientation. Overall, we found grayling fry in low numbers at every fourth site, with the sites' exposure and dominant substrate coarseness being most relevant variables. In particular, more exposed sites (i.e. with higher fetch values) and fine-grained substrates dominated by sand or gravel had more grayling fry. Average depth, bottom shear stress or shoreline orientation along the north-south axis did not have a significant effect. Together, the results suggest that the most important nursery areas for lake-dwelling grayling are lakeshore zones that are barren and exposed. Hence, the sites share characteristics with those used for reproduction by the more common riverine grayling. We hope that these findings will facilitate lake-dwelling grayling's management and conservation efforts.
英文关键词	biodiversity; environmental ecology; freshwater; habitat choice; lacustrine; population; reproduction; salmonid
语种	英语
WOS研究方向	Fisheries
WOS类目	Fisheries
WOS记录号	WOS:001189323000001
来源期刊	AQUACULTURE, FISH AND FISHERIES
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/303051
作者单位	Natural Resources Institute Finland (Luke); Natural Resources Institute Finland (Luke); Finnish Environment Institute; University of Jyvaskyla; Natural Resources Institute Finland (Luke); Natural Resources Institute Finland (Luke)
推荐引用方式 GB/T 7714	Lehtonen, Topi K.,Hirvonen, Esa,Kolari, Irma,et al. Lakeshore areas of conservation interest: Characteristics of nursery areas of the threatened lake-dwelling grayling, Thymallus thymallus[J],2024,4(2).
APA	Lehtonen, Topi K..,Hirvonen, Esa.,Kolari, Irma.,Ropponen, Janne.,Nyholm, Kristiina.,...&Vehanen, Teppo.(2024).Lakeshore areas of conservation interest: Characteristics of nursery areas of the threatened lake-dwelling grayling, Thymallus thymallus.AQUACULTURE, FISH AND FISHERIES,4(2).
MLA	Lehtonen, Topi K.,et al."Lakeshore areas of conservation interest: Characteristics of nursery areas of the threatened lake-dwelling grayling, Thymallus thymallus".AQUACULTURE, FISH AND FISHERIES 4.2(2024).