Associational resistance mediates interacting effects of herbivores and competitors on fireweed performance

Axelsson, E. Petter; Stenberg, Johan A.

doi:10.1016/j.baae.2013.12.003

Cited by 4 publications

(3 citation statements)

References 36 publications

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“…This finding suggested that biotic stresses affect the plant–plant interactions. A similar condition was also reported for Filipendula ulmaria 38 .…”

Section: Discussionsupporting

confidence: 86%

Unpalatable plants induce a species-specific associational effect on neighboring communities

Erfanian

Memariani

Atashgahi

et al. 2021

Sci Rep

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In grazing conditions, unpalatable species may induce either associational defense or neighbor contrast susceptibility in neighboring communities. Using surveys from eight grasslands, we tested whether various unpalatable species have the same impacts on neighboring communities in response to grazing. The studied unpalatable species were: Phlomis cancellata (an unpalatable nonpoisonous plant), Euphorbia boissieriana, E.microsciadia (poisonous plants), and Seseli transcaucasicum (a highly poisonous plant). Our results showed that, in the ungrazed grasslands, communities containing P. cancellata had lower biodiversity than communities without it. In the moderately- and heavily grazed grasslands, P. cancellata induced associational defense in the neighboring communities. In heavily grazed grasslands, both Euphorbia species promoted neighbor contrast susceptibility in the neighboring communities. Similarly, S. transcaucasicum in a heavily grazed grassland, induced neighbor contrast susceptibility. Different responses of plant community vulnerability among the studied unpalatable plants might be due to herbivore different foraging decisions. Accordingly, grazers selectively choose from other patches when facing P. cancellata and other plant individuals when there is a poisonous plant in a patch. Our results suggested that grazing intensity may not substantially affect the foraging decisions of sheep and goats in response to unpalatable species. We recommend monitoring the abundance of poisonous species to maintain the sustainable use of grasslands.

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“…This finding suggested that biotic stresses affect the plant–plant interactions. A similar condition was also reported for Filipendula ulmaria 38 .…”

Section: Discussionsupporting

confidence: 86%

Unpalatable plants induce a species-specific associational effect on neighboring communities

Erfanian

Memariani

Atashgahi

et al. 2021

Sci Rep

View full text Add to dashboard Cite

show abstract

“…Two important mechanisms structuring herbivory in space are associational resistance (Tahvanainen & Root, ; Hay, ; Sobek et al., ; Axelsson & Stenberg, ), and associational susceptibility (Holt, ; Rand, ; White & Whitham, ). These mechanisms occur if the focal plant experiences less or more damage from a given herbivore depending on co‐occurring plant species.…”

Section: Introductionmentioning

confidence: 99%

Raspberry inflicts associational susceptibility to meadowsweet in a complex food web

Stenberg

Ericson

2015

Entomologia Exp Applicata

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Meadowsweet [Filipendula ulmaria (L.) Maxim. (Rosaceae)] has previously been reported to enjoy associational resistance in mixed populations with purple loosestrife [Lythrum salicaria L. (Lythraceae)] due to a shared hymenopteran parasitoid that provides top-down control of herbivory. Here, we report that meadowsweet suffers associational susceptibility in mixed populations with raspberry [Rubus idaeus L. (Rosaceae)] due to a shared herbivore, the raspberry flea beetle [Batophila rubi (Paykull) (Coleoptera: Chrysomelidae)]. Close to raspberry (less than 0.5 m), herbivory on meadowsweet often reached 20-25%, whereas further away (1.5-2 m) herbivory was almost always 0%. We especially highlight the different scales at which the opposing associational effects occur. The shared parasitoid forages throughout entire populations, making the level of population the focal scale of the associational resistance. The shared herbivore, however, spills over from raspberry to neighboring meadowsweets only, making the distance to individual raspberry plants the focal scale for associational susceptibility for meadowsweet. We conclude that different co-occurring plant species can mediate opposing associational effects on a focal host plant by altering the abundance and composition of herbivores and parasitoids, respectively, resulting in multiple selection layers to the geographic mosaic of herbivory.

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“…During caged-insect feeding trials, we did observe apical meristem damage by S. exigua on one plant that resulted in multiple flowering branches and apparent overcompensation. A variety of mammals, such as moose (Axelsson and Stenberg 2014), and gall-forming insects (Hersch-Green, personal observation) are known to damage fireweed in natural populations, but the relative tolerance of diploid and tetraploid fireweed to this type of damage is not known.…”

Section: )mentioning

confidence: 99%

Investigating the role of polyploidy in the response of Chamerion angustifolium to increased soil nitrogen availability and insect herbivory

Bales

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Associational resistance mediates interacting effects of herbivores and competitors on fireweed performance

Cited by 4 publications

References 36 publications

Unpalatable plants induce a species-specific associational effect on neighboring communities

Unpalatable plants induce a species-specific associational effect on neighboring communities

Raspberry inflicts associational susceptibility to meadowsweet in a complex food web

Investigating the role of polyploidy in the response of Chamerion angustifolium to increased soil nitrogen availability and insect herbivory

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