干旱区生态环境知识资源中心(Arid): Unravelling effects of grazing intensity on genetic diversity and fitness of desert vegetation

Arid

DOI	10.1016/j.pecon.2020.06.005
	Unravelling effects of grazing intensity on genetic diversity and fitness of desert vegetation
	Ivon Pelliza, Y.; Souto, C. P.; Tadey, M.
通讯作者	Pelliza, YI
来源期刊	PERSPECTIVES IN ECOLOGY AND CONSERVATION
ISSN	2530-0644
出版年	2020
卷号	18 期号:3 页码:178-189
英文摘要	Biodiversity conservation focuses on species and/or populations, but preserving genetic diversity and structure has received limited attention and even less maintaining species evolutionary potential over generations. Genetic diversity is an essential component of biodiversity enabling species' persistence, particularly under disturbances. Via sexual reproduction genetic diversity is transmitted across generations and greater outcrossing in parental populations will lead to greater genetic diversity in their offspring. Grazing by exotic large herbivores is one of the main disturbances driving biodiversity loss threatening rangelands sustainability worldwide. We investigated grazing effects on fitness and genetic diversity of parental and offspring cohorts of Prosopis alpataco from Patagonian Monte Desert. We collected fresh leaves and seeds from 10 independent rangelands with different herbivore density, forming a grazing gradient, and estimated genetic parameters from allele frequencies using isoenzymes. We recorded plant size, seed weight, seed set, seedling emergence and mortality as proxies of plant fitness. Applying regression models and path analysis (D-separation) approaches we observed that increasing grazing reduced seed set and seedling emergence, and significantly increased seedling mortality. Parental and offspring suffered from inbreeding. Moreover, we found genetic diversity loss throughout cohorts in all rangelands, however, this loss was relatively lower at intermediate grazing intensities. The introduction of large herbivores in unmanaged rangelands affected vegetation structure, jeopardizing their evolutionary potential and system sustainability. Therefore, natural revegetation may be compromised by aggravated genetic diversity losses along generations that might be deepened in drylands under forecasted climate change. This highlights the importance of evaluating and conserving genetic diversity. (C) 2020 Associacao Brasileira de Ciencia Ecologica e Conservacao. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
英文关键词	Herbivory Genetic diversity Inbreeding Fitness Prosopis alpataco Patagonian Monte Desert
类型	Article
语种	英语
开放获取类型	Other Gold
收录类别	SCI-E
WOS记录号	WOS:000579507700004
WOS关键词	GENUS PROSOPIS LEGUMINOSAE ; POPULATION-SIZE ; HABITAT FRAGMENTATION ; MONTE DESERT ; INBREEDING DEPRESSION ; POLLINATOR LIMITATION ; INTEGRAL FLOUR ; CLONAL HERB ; SEED SET ; CONSERVATION
WOS类目	Biodiversity Conservation
WOS研究方向	Biodiversity & Conservation
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/326870
作者单位	[Ivon Pelliza, Y.; Souto, C. P.; Tadey, M.] Univ Nacl Comahue, Lab Ecotono INIBIOMA CONICET CRUB, Quintral 1250, RA-8400 San Carlos De Bariloche, Rio Negro, Argentina
推荐引用方式 GB/T 7714	Ivon Pelliza, Y.,Souto, C. P.,Tadey, M.. Unravelling effects of grazing intensity on genetic diversity and fitness of desert vegetation[J],2020,18(3):178-189.
APA	Ivon Pelliza, Y.,Souto, C. P.,&Tadey, M..(2020).Unravelling effects of grazing intensity on genetic diversity and fitness of desert vegetation.PERSPECTIVES IN ECOLOGY AND CONSERVATION,18(3),178-189.
MLA	Ivon Pelliza, Y.,et al."Unravelling effects of grazing intensity on genetic diversity and fitness of desert vegetation".PERSPECTIVES IN ECOLOGY AND CONSERVATION 18.3(2020):178-189.