干旱区生态环境知识资源中心(Arid): Intraspecific competition for host resources in a parasite

Arid

DOI	10.1016/j.cub.2021.01.034
	Intraspecific competition for host resources in a parasite
	Nabity, Paul D.; Barron-Gafford, Greg A.; Whiteman, Noah K.
通讯作者	Nabity, PD (corresponding author), Univ Calif Riverside, Dept Bot & Plant Sci, 900 Univ Ave, Riverside, CA 92125 USA.
来源期刊	CURRENT BIOLOGY
ISSN	0960-9822
EISSN	1879-0445
出版年	2021
卷号	31 期号:6 页码:1344-+
英文摘要	Intraspecific competition among parasites should, in theory, increase virulence, but we lack clear evidence of this from nature.(1-3) Parasitic plants, which are sessile and acquire carbon-based resources through both autotrophy (photosynthesis) and heterotrophy (obtaining carbon from the host), provide a unique opportunity to experimentally study the role of intraspecific competition for nutrients in shaping the biology of both parasite and host.(4-6) Here, we manipulated the spatial position of naturally occurring individuals of desert mistletoe (Phoradendron californicum), a xylem hemiparasite, by removing parasites from co-infected branches of a common nitrogen-fixing host, velvet mesquite (Prosopsis velutina), in the Sonoran Desert. We measured physiological performance of both host and parasite individuals under differing competitive environments-parasite location along the xylem stream-through time. Performance was determined by measuring resource availability and use, given that resource demand changed with competitor removal and monsoon-driven amelioration of seasonal drought. Our principal finding was that intraspecific competition exists for xylem resources between mistletoe individuals, including host carbon. Host performance and seasonal climate variation altered the strength of competition and virulence. Hemiparasitic desert mistletoes demonstrated high heterotrophy, yet experimental removals revealed density- and location-dependent effects on the host through feedbacks that reduced mistletoe autotrophy and improved resource availability for the remaining mistletoe individual. Trophic flexibility tempered intraspecific competition for resources and reduced virulence. Mistletoe co-infections might therefore attenuate virulence to maintain access to resources in particularly stressful ecological environments. In summary, experimental field manipulations revealed evidence for intraspecific competition in a parasite species.
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000632826400010
WOS类目	Biochemistry & Molecular Biology ; Biology ; Cell Biology
WOS研究方向	Biochemistry & Molecular Biology ; Life Sciences & Biomedicine - Other Topics ; Cell Biology
来源机构	University of Arizona ; University of California, Berkeley
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/349908
作者单位	[Nabity, Paul D.] Univ Calif Riverside, Dept Bot & Plant Sci, 900 Univ Ave, Riverside, CA 92125 USA; [Barron-Gafford, Greg A.] Univ Arizona, Sch Geog Dev & Environm, POB 210137, Tucson, AZ 85721 USA; [Whiteman, Noah K.] Univ Calif Berkeley, Dept Integrat Biol, Berkeley, CA 94720 USA
推荐引用方式 GB/T 7714	Nabity, Paul D.,Barron-Gafford, Greg A.,Whiteman, Noah K.. Intraspecific competition for host resources in a parasite[J]. University of Arizona, University of California, Berkeley,2021,31(6):1344-+.
APA	Nabity, Paul D.,Barron-Gafford, Greg A.,&Whiteman, Noah K..(2021).Intraspecific competition for host resources in a parasite.CURRENT BIOLOGY,31(6),1344-+.
MLA	Nabity, Paul D.,et al."Intraspecific competition for host resources in a parasite".CURRENT BIOLOGY 31.6(2021):1344-+.