DOI: 10.1111/1365-2745.13295
论文题名: Ecological consequences of parasite host shifts under changing environments: More than a change of partner
作者: Mellado A. ; Zamora R.
刊名: Journal of Ecology
ISSN: 220477
出版年: 2020
卷: 108, 期: 2 语种: 英语
英文关键词: biotic interaction
; climate warming
; host switching
; life history traits
; parasitism
; species assemblage
Scopus关键词: assembly rule
; biotic factor
; ecological approach
; ecological impact
; environmental change
; geographical distribution
; global warming
; host-parasite interaction
; interspecific interaction
; life history trait
; parasitic plant
; parasitism
; Pinus nigra
; Pinus sylvestris
; Viscum album
英文摘要: Parasitic plants, among many other parasitic organisms, are shifting in their geographic distribution in response to global change, establishing novel interactions with susceptible but previously unexposed host plants. Projections of future species assemblages in increasingly changing environments frequently overlook the strong capacity of these parasites to transform ecological systems, and host switching is considered a mere change of partner with no subsequent impact on ecosystem properties. We explore the ecological consequences of parasite host shifts analysing the growth and reproductive responses of two host trees that share a different interaction-history with the parasitic plant Viscum album: recent in the case of Pinus sylvestris subsp. nevadensis and longstanding in that of Pinus nigra. We quantified growth by measuring primary (bud elongation) and secondary (dendrochronology) tree growth, and reproduction by quantifying cone crops, cone size, seed production, seed weight, seed germination, and emergence success. Pinus nigra registered a minor effect on reproduction but a major reduction in biomass, clearly reflected in lower primary and secondary tree growth, smaller cones and lighter seeds. On the contrary, P. sylvestris subsp. nevadensis underwent a strong decline of its reproductive capacity with no effects on growth, manifested in smaller cone crops, less seed production, and lower germination and emergence success. Synthesis. Mistletoe parasitism unleashes contrasting responses in taxonomically close host species with sharply different consequences for the forest ecosystem. While old hosts tolerate better the effect of parasitism, minimizing the impact on reproduction at the expense of their growth, recent hosts undergo greater effects of parasitism, suffering reproductive collapse with no perceptible loss of growth. We conclude that the increasing phenomenon of parasite host switching is not just a mere change of partner, but a driver of a new ecosystem organization. These results highlight the importance of considering the specific effects of newly established interactions when predicting future species assemblages, as these can trigger different ecological organizations from those we currently know. © 2019 The Authors. Journal of Ecology © 2019 British Ecological Society Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/158789
Appears in Collections: 气候变化与战略
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作者单位: Department of Ecology, Terrestrial Ecology Research Group, University of Granada, Granada, Spain
Recommended Citation:
Mellado A.,Zamora R.. Ecological consequences of parasite host shifts under changing environments: More than a change of partner[J]. Journal of Ecology,2020-01-01,108(2)