Impacts of Invasive Species on Food Webs

David, Patrice; Thébault, Élisa; Anneville, Orlane; Duyck, Pierre François; Chapuis, Élodie; Loeuille, Nicolas

doi:10.1016/bs.aecr.2016.10.001

Cited by 257 publications

(233 citation statements)

References 237 publications

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“…In a meta-analysis on the impacts of aquatic invaders, Gallardo et al (2016) revealed that competition and predation are the key processes driving ecological impacts in aquatic ecosystems, with indirect competitive effects from alien consumers often adversely affecting native species, leading to substantial modifications in food web structure (David et al, 2017). In a meta-analysis on the impacts of aquatic invaders, Gallardo et al (2016) revealed that competition and predation are the key processes driving ecological impacts in aquatic ecosystems, with indirect competitive effects from alien consumers often adversely affecting native species, leading to substantial modifications in food web structure (David et al, 2017).…”

Section: Discussionmentioning

confidence: 99%

Predicting the ecological impacts of an alien invader: Experimental approaches reveal the trophic consequences of competition

Britton

Roberts

Trigo

et al. 2019

Journal of Animal Ecology

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Ecological theory on the trophic impacts of invasive fauna on native competitors is equivocal. Whilst increased interspecific competition can result in coexisting species having constricted and diverged trophic niches, the competing species might instead increase their niche sizes to maintain energy intakes. Empirical experiments can test invasion theory on competitive interactions and niche sizes across different spatial scales and complexity. The consequences of increased interspecific competition from a model alien fish Leuciscus idus were tested on two taxonomically and trophically similar native fishes, Squalius cephalus and Barbus barbus. Competitive interactions were tested in tank aquaria using comparative functional responses (CFRs) and cohabitation trials. The consequences of these competitive interactions for the trophic niche sizes and positions of the fishes were tested in pond mesocosms. Comparative functional responses revealed that compared to B. barbus, L. idus had significantly higher attack and consumption rates; cohabitation trials revealed B. barbus growth rates were depressed in sympatry with L. idus. For L. idus and S. cephalus, differences in their functional response parameters and growth rates were not significant. Pond mesocosms used stable isotope metrics to quantify shifts in the trophic niche sizes of the fishes between allopatry and sympatry using a substitutive experimental design. Isotopic niches were smaller and more divergent in sympatric paired species than predicted by their allopatric treatments, suggesting trophic impacts from interspecific competition. However, an all‐species sympatric treatment revealed similar niche sizes with allopatry. This maintenance of niche sizes in the presence of all species potentially resulted from the buffering of direct competitive effects of the species pairs by indirect effects. Experimental predictions from tank aquaria assisted the interpretation of the constricted and diverged trophic niches detected in the paired‐species sympatric treatments of the pond mesocosms. However, the all‐species sympatric treatment of this experiment revealed greater complexity in the outcomes of the competitive interactions within and between the species. These results have important implications for understanding how alien species integrate into food webs and influence the trophic relationships between native species.

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Section: Discussionmentioning

confidence: 99%

Predicting the ecological impacts of an alien invader: Experimental approaches reveal the trophic consequences of competition

Britton

Roberts

Trigo

et al. 2019

Journal of Animal Ecology

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show abstract

“…Contrary to competitive networks, such trophic structures have received much more attention in the literature, particularly in the last years (Bohan, Dumbrell, & Massol, ; Hui & Richardson, ). Examples range from mutualistic interactions in plant–pollinator networks (Aizen, Morales, & Morales, ; Minoarivelo & Hui, ; Traveset & Richardson, ) and plant–rhizobia networks (Le Roux, Hui, Keet, & Ellis, ) to antagonistic interactions mainly in food webs (David et al, ; Patterson et al, ; Smith, ). It is therefore not my intention to provide here a summary of how prior work has established connections between these trophic networks and invasion biology.…”

Section: Invasion In Trophic Networkmentioning

confidence: 99%

Coexistence theory as a tool to understand biological invasions in species interaction networks: Implications for the study of novel ecosystems

Godoy

2019

Functional Ecology

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Questions related to understanding which characteristics of the recipient communities make them vulnerable to invasion (i.e. invasibility) are commonly formulated in such a way that they consider ecological communities as whole entities. Yet, species within recipient communities have specific responses to the introduction of exotic species. As a consequence, little is known about the role of species interaction networks within and between trophic levels in determining the invasion likelihood of exotics introduced in previously uninvaded communities and the temporal dynamics of invaded communities. To obtain a mature understanding of invasion processes and their impacts, I propose here to apply a structural stability approach of species coexistence to the field of biological invasions. The main aim here is to distinguish how direct and indirect species’ responses to invasion in competitive and trophic networks translate to the mechanisms determining the maintenance and stability of species diversity in multispecies and multitrophic assemblages. This approach brings the further opportunity to integrate the field of biological invasions within a broader perspective about the study of novel ecosystems, that is, ecosystems that contain exotic species and face new introductions sometimes under abrupt environmental changes. Moreover, it can help to target specific mechanisms separating winners from losers in novel ecosystems. Synthesis. A solid framework to predict biological invasions and understand community assembly along temporal scales under novel ecosystems can be obtained by framing species’ responses to invasion within recent theoretical and methodological advances stemming from coexistence theory, which seeks to determine how diversity is maintained. A plain language summary is available for this article.

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“…The overall low predation rate could be a result of both species not sharing a coevolutionary history, assuming that the predator does not adequately recognize its exotic prey (David et al 2017), and D. esakii could evolve to be more efficient in the future (Carlsson et al 2009). Another possible explanation for the low predation rate could be the short acclimation period.…”

Section: Discussionmentioning

confidence: 99%

Characterizing a novel predator–prey relationship between native Diplonychus esakii (Heteroptera: Belostomatidae) and invasive Gambusia affinis (Teleostei: Poeciliidae) in central China

et al. 2017

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A considerable body of the literature considers the potential impact of exotic predators on native prey organisms, while comparatively, few studies have asked whether and how native predators include novel prey types into their diet spectrum. Here, we asked whether the native aquatic heteropteran Diplonychus esakii preys on the highly invasive western mosquitofish (Gambusia affinis), which has been introduced to southern China and threatens native fish species through competition and predation on their fry. We conducted 48-h prey choice experiments under semi-natural conditions. In a 'no-choice' experiment (one predator and one potential prey; n = 200), we found the heteropterans to prey more on large-bodied fish, a pattern that was also described for other belostomatids, while prey sex had no effect on capture rates. Moreover, large-bodied heteropterans caught more fish than small-bodied individuals. However, overall capture rates in our study were low (11.5-30%) compared to studies on other belostomatids, which explains why subsequent binary prey choice experiments using one predator and two prey-either large and small females or male and female (with smaller sample sizes of n = 20 and 30, respectively)-did not confirm the results of our first experiment. Our study exemplifies how a pattern of body size-dependent predation can arise in a novel (not coevolved) predator-prey interaction. We tentatively argue that the observed pattern could be driven by intrinsic features of the predator, namely, altered prey preferences with increasing age coupled with a general preference for large-bodied prey, or changing nutritional needs at different developmental stages.

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Impacts of Invasive Species on Food Webs

Cited by 257 publications

References 237 publications

Predicting the ecological impacts of an alien invader: Experimental approaches reveal the trophic consequences of competition

Predicting the ecological impacts of an alien invader: Experimental approaches reveal the trophic consequences of competition

Coexistence theory as a tool to understand biological invasions in species interaction networks: Implications for the study of novel ecosystems

Characterizing a novel predator–prey relationship between native Diplonychus esakii (Heteroptera: Belostomatidae) and invasive Gambusia affinis (Teleostei: Poeciliidae) in central China

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