Vegetation complexity—The influence of plant species diversity and plant structures on plant chemical complexity and arthropods

Randlkofer, Barbara; Obermaier, Elisabeth; Hilker, Monika; Meiners, Torsten

doi:10.1016/j.baae.2010.03.003

Cited by 153 publications

(140 citation statements)

References 127 publications

Supporting

Mentioning

130

Contrasting

Unclassified

Order By: Relevance

“…Although in this study the two background odours and the delivery systems could be regarded as a major contribution in filling the volatile gap, the chemical/physical degradation of volatiles, the foraging experience of the insects and the modification of the odour plume by the natural vegetation may further explain the divergence often measured between laboratory and field studies in other insect-plant interactions (Randlkofer, Obermaier, Hilker, & Meiners 2010). While the results in our system are encouraging, we need to consider the probability that in certain plant-insect interactions, attractants active in a volatile background might not be found.…”

Section: Discussionmentioning

confidence: 88%

Spotting the invaders: A monitoring system based on plant volatiles to forecast apple fruit moth attacks in apple orchards

Knudsen

2015

Basic and Applied Ecology

View full text Add to dashboard Cite

Section: Discussionmentioning

confidence: 88%

Spotting the invaders: A monitoring system based on plant volatiles to forecast apple fruit moth attacks in apple orchards

Knudsen

2015

Basic and Applied Ecology

View full text Add to dashboard Cite

“…As herbivore egg numbers or effects of antagonists on immature stages were not quantified in our study, we cannot exclude the possibility that the lower density of E. gastralis caterpillars observed in monocultures may also be related to higher rates of predation or parasitism in this stand type (Gingras et al 2003;Randlkofer et al 2010). The potential of natural enemies to reduce E. gastralis populations is indicated by a study from a Venezuelan forest reserve, which states that the abundance of this important herbivore of T. rosea is generally kept at low levels by parasitoids and predators (Hernández and Briceño 1998;Hernández and Briceño 1999).…”

Section: Discussionmentioning

confidence: 98%

“…Avoidance of oviposition in monocultures by E. gastralis moths may also represent a search for 'enemy-free space' (Pöykkö 2011 and references therein), as a more complex vegetation and larger distances between host tree individuals can impede host localization by key enemies of a focal herbivore (Gols and Harvey 2009;Randlkofer et al 2010;Mody et al 2011). As herbivore egg numbers or effects of antagonists on immature stages were not quantified in our study, we cannot exclude the possibility that the lower density of E. gastralis caterpillars observed in monocultures may also be related to higher rates of predation or parasitism in this stand type (Gingras et al 2003;Randlkofer et al 2010).…”

Section: Discussionmentioning

confidence: 99%

Associational resistance and associational susceptibility: specialist herbivores show contrasting responses to tree stand diversification

et al. 2011

View full text Add to dashboard Cite

Heterospecific neighbors may reduce damage to a focal plant by lowering specialist herbivore loads (associational resistance hypothesis), or enhance damage by increasing generalist herbivore loads (associational susceptibility hypothesis). We tested the associational effects of tree diversity on herbivory patterns of the tropical focal tree Tabebuia rosea in an experimental plantation setup, which contained tree monocultures and mixed stands. We found higher herbivore damage to T. rosea at higher tree diversity, indicating that T. rosea did not benefit from associational resistance but rather experienced associational susceptibility. The specific consideration of the two dominant insect herbivore species of T. rosea, the specialist chrysomelid Walterianella inscripta and the specialist pyralid Eulepte gastralis, facilitated understanding of the detected damage patterns. Tree diversity exerted opposite effects on tree infestation by the two herbivores. These findings point to resource concentration effects for the chrysomelid beetle (favored by tree monoculture) and to resource dilution effects for the pyralid caterpillar (favored by tree mixture) as underlying mechanisms of herbivore distribution. A strong contribution of the pyralid to overall damage patterns in diversified stands suggests that associational susceptibility may not necessarily be related to higher abundances of generalist herbivores but may also result from specialized herbivores affected by resource dilution effects. Thus, the identity and biology of herbivore species has to be taken into account when attempting to predict damage patterns in forest ecosystems.

show abstract

“…An increasing dilution between non-host trees is an important driver of AR (Hambäck and Beckerman 2003;Jactel et al 2006;Damien et al 2016). This dilution effect on ACGW infestation rates could be explained by heterospecific neighbours acting as physical (Castagneyrol et al 2014b;Damien et al 2016) or chemical barriers (Tahvanainen and Root 1972;Randlkofer et al 2010;Jactel et al 2011) to chestnut localisation by ACGW (see also Germinara et al 2011). Blight symptoms in interaction with chestnut apparency modifies ACGW infestations…”

Section: Acgw Infestation Rates Depend On Tree Neighbour Identitymentioning

confidence: 99%

Plant neighbour identity and invasive pathogen infection affect associational resistance to an invasive gall wasp

et al. 2017

View full text Add to dashboard Cite

Theory predicts that mixed forests are more resistant to native pests than pure forests (i.e. associational resistance) because of reduced host accessibility and increased top-down control by natural enemies. Yet, whether the same mechanisms also apply to invasive pests remains to be verified. We tested the hypothesis of associational resistance against the invasive Asian chestnut gall wasp (ACGW, Dryocosmus kuriphilus) by comparing ACGW infestation rates on chestnuts (Castanea sativa) in stands varying in species composition (chestnut alone or associated with oaks, pines or ashes). We investigated the effects of reduced chestnut density and frequency in mixed stands, as well as the effect of biotic interactions between ACGW, its parasitoids and the chestnut blight disease (caused by Cryphonectria parasitica). ACGW infestation rates were significantly lower in chestnut-oak and chestnut-ash mixtures than in pure chestnut stands and chestnut-pine mixtures. Infestation rate decreased with decreasing chestnut relative proportion. The composition of native parasitoid communities emerged from galls significantly differed between pure and mixed chestnut stands, but not the species richness or abundance of parasitoids. The abundance of the introduced parasitoid Torymus sinensis was not correlated with ACGW infestation rates and was independent of stand composition. Blight symptoms modified ACGW infestation rates with taller trees being preferred when they were asymptomatic but avoided when they presented blight disease damage. Our results suggest that conservation biological control based on tree species mixtures could contribute to reducing the damage of invasive forest pests.Excepting for the first and last authors, the order of authors is alphabetical.

show abstract

Vegetation complexity—The influence of plant species diversity and plant structures on plant chemical complexity and arthropods

Cited by 153 publications

References 127 publications

Spotting the invaders: A monitoring system based on plant volatiles to forecast apple fruit moth attacks in apple orchards

Spotting the invaders: A monitoring system based on plant volatiles to forecast apple fruit moth attacks in apple orchards

Associational resistance and associational susceptibility: specialist herbivores show contrasting responses to tree stand diversification

Plant neighbour identity and invasive pathogen infection affect associational resistance to an invasive gall wasp

Contact Info

Product

Resources

About