Associational susceptibility of a native shrub induced by context‐dependent attraction of an invasive herbivore

Lillian, Sarah; Redak, Richard A.; Daugherty, Matthew P.

doi:10.1002/ecs2.2442

Cited by 6 publications

(4 citation statements)

References 57 publications

(109 reference statements)

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“…For example, plants may experience associational resistance when more palatable species or alternate hosts are present (Fernandez‐Conradi et al, 2018; Hahn & Orrock, 2016), when visual or olfactory cues from neighbours disrupt the ability of herbivores to locate the focal species (Finch et al, 2003; Rausher, 1981), or when the architecture or defences of neighbours deter herbivore foraging (i.e., provide an associational refuge; Coverdale et al, 2018). Conversely, plants may experience associational susceptibility (i.e., increased herbivory due to neighbours; Kim et al, 2015; Letourneau, 1995) when herbivores ‘spill over’ from neighbours to the focal plant (Lillian et al, 2018; White & Whitham, 2000), or when neighbour‐driven changes to focal plant traits increase the plant's vulnerability to herbivore attack (Castagneyrol et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Some neighbours are better than others: Variation in associational effects among plants in an old field community

et al. 2022

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1. Consumer-resource interactions are often influenced by other species in the community, such as when neighbouring plants increase or reduce herbivory to a focal plant species (known as associational effects). The many studies on associational effects between a focal plant and some neighbour have shown that these effects can vary greatly in strength and direction. But because almost all of these studies measure associational effects from only one or two neighbour species, we know little about the actual range of associational effects that a plant species might encounter in a natural setting. This makes it difficult to determine how important effects of neighbours are in real field settings, and how associational effects might interact with competition and other processes to influence plant community composition.2. In this study, we used a field experiment with a focal species, Solanum carolinense, and 11 common neighbour species to investigate how associational effects vary among many co-occurring neighbour species and to test whether factors such as neighbour plant apparency, phylogenetic proximity to the focal species, or effects on focal plant defence traits help to explain interspecific variation in associational effect strength.3. We found that some neighbour species affected S. carolinense damage and attack by specialist herbivores, but associational effects of most neighbours were weak.Associational effects increased herbivore attack on average earlier in the season (associational susceptibility) and reduced herbivore attack on average later in the season (associational resistance) relative to S. carolinense in monoculture. 4. We found some evidence that a neighbour's associational effect was related to its biomass and phylogenetic proximity to the focal species. While neighbour species differed in their effects on physical leaf traits of focal plants (trichome density, specific leaf area, and leaf toughness), these traits did not appear to mediate the effects of neighbours on focal plant herbivory. 5. Synthesis. Our results suggest that the distribution of associational effect strengths in natural communities are similar to those observed for other interaction types, and that multiple mechanisms are likely acting simultaneously to shape associational effects of different neighbour species.

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Section: Introductionmentioning

confidence: 99%

Some neighbours are better than others: Variation in associational effects among plants in an old field community

et al. 2022

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“…Herbivore‐mediated indirect effects of invasive plants on native plants are largely context‐dependent (Lau & Strauss, 2005; Lillian et al., 2018), and they can be positive (Atwater et al., 2011), neutral (White et al., 2008) or negative (Orrock et al., 2015; Rand et al., 2004; Recart et al., 2012). Exotic herbivores reassociated with exotic plants in the introduced range may damage the exotic plants more than native plants, which could tip the competitive balance in favour of the native plants.…”

Section: Introductionmentioning

confidence: 99%

“…Conversely, introduced herbivores sometimes feed on native plants and decrease their fitness and competitive ability (Louda et al., 2003; Paynter et al., 2020). Moreover, apparent competition can occur when invasive plants enhance the damage caused by the introduced herbivores to native plants (Lau & Strauss, 2005; Lillian et al., 2018; Rand et al., 2004), which reduces interspecific competition, thereby benefitting the invasive plants. This may also promote the establishment of other exotic plants, predicted by the invasional meltdown hypothesis, which states that facilitation among exotic species results in the accumulation of exotic species and their impacts (Simberloff & Von Holle, 1999).…”

Section: Introductionmentioning

confidence: 99%

An exotic herbivore reinforces competition between exotic and native plants

Sakata

Craig

2021

Journal of Ecology

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Despite increasing evidence that herbivore‐mediated indirect effects play a major role in plant competition, it is unclear how and when they contribute to plant invasiveness. The outcomes of herbivore‐mediated indirect effects are primarily dependent on the environment and have complex interactions with the direct interactions between plants. We evaluated the herbivore‐mediated indirect effects of Solidago altissima (Asteraceae) on other co‐occurring native Asteraceae species at multiple sites in a native range [the United States (US)] and in an introduced range (Japan) using common garden experiments. We examined the effect of S. altissima on herbivore damage, above‐ground vegetative and reproductive traits of the co‐occurring Asteraceae species at sites with different densities of a herbivore, the lace bug, Corythucha marmorata, which is native to the US and introduced in Japan. We observed increased lace bug herbivory in plants grown with S. altissima in Japan but decreased lace bug herbivory in the US. We did not find consistent effect of S. altissima on aboveground vegetative production of co‐occurring plants in either ranges. Flower production decreased in plants grown with S. altissima in Japan because of both direct competition and increased herbivory. Direct competition and apparent competition via lace bug herbivory interacted to produce a strong negative effect of S. altissima on co‐occurring plants only in Japan. Synthesis. The findings imply that evolutionary history and the local environment jointly affect herbivore‐mediated indirect effects, which play a large role in shaping the pattern of herbivory and plant competition. Another implication of our results is that exotic herbivores may reinforce the negative effects of exotic plants on native plants under high herbivore density environments.

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“…The spillover effect has been shown to be largely dependent on site‐ and landscape‐scale abundances of the exotic plant (Rand & Louda, 2004). It has also been suggested that plant phenology and insect communities may determine the apparent competition, which makes it difficult to predict their effects (Lau & Strauss, 2005; Lillian et al, 2018; Russell & Louda, 2005). On the other hand, a study that reviewed nontarget impacts of biological control agents found that few had a negative impact on native species (Hinz et al, 2019; Suckling & Sforza, 2014).…”

Section: Introductionmentioning

confidence: 99%

Geographic variation and temporal changes in plant–herbivore interaction: Case studies with Solidago altissima in native and introduced ranges

Sakata

2021

Plant Species Biology

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Plants are subjected to environmental gradients and may encounter various herbivores, leading to geographic variation in defensive traits. The present review highlights that biological invasions are remarkable natural experiments for studying geographic variation in plant-herbivore interaction and tracking temporal dynamics in plant defense in response to environmental changes. Studies from this viewpoint can challenge various general topics in plant ecology, including the evolution of plant defense and indirect interactions among plants. First, I provide a brief overview on how the introduction of exotic herbivores drives rapid evolution after the establishment of exotic plants and its impacts on native plants. Second, I present a series of case studies investigating the patterns and mechanisms of geographic variation in the interaction between Solidago altissima and Corythucha marmorata (lace bug) in the native range in the United States and the introduced range in Japan. By combining

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Associational susceptibility of a native shrub induced by context‐dependent attraction of an invasive herbivore

Cited by 6 publications

References 57 publications

Some neighbours are better than others: Variation in associational effects among plants in an old field community

Some neighbours are better than others: Variation in associational effects among plants in an old field community

An exotic herbivore reinforces competition between exotic and native plants

Geographic variation and temporal changes in plant–herbivore interaction: Case studies with Solidago altissima in native and introduced ranges

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