Predatory impacts of alien decapod Crustacea are predicted by functional responses and explained by differences in metabolic rate

Taylor, Nigel G.; Dunn, Alison M.

doi:10.1007/s10530-018-1735-y

Cited by 20 publications

(16 citation statements)

References 81 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The reduced gastropod abundance in all invasive alien species treatments was expected from previous studies that showed higher rates of predation by invasive than native species on gastropod prey (Haddaway et al., ; Nyström et al., ; Taylor & Dunn, ). Previous mesocosm studies of these two invasive decapod species also showed similar impacts on gastropods (Rosewarne et al., ) or other benthic molluscs (Rudnick & Resh, ).…”

Section: Discussionsupporting

confidence: 78%

See 1 more Smart Citation

Multi‐faceted impacts of native and invasive alien decapod species on freshwater biodiversity and ecosystem functioning

et al. 2018

View full text Add to dashboard Cite

Changes to species composition, such as biological invasions and extinctions, have the potential to alter ecosystems. Invaders often replace taxonomically similar species, resulting in potentially redundant impacts. For example, freshwater decapod crustaceans are pervasive invasive alien species but they often extirpate native decapods. This study addresses whether or not these compositional shifts lead to impacts on the structure of the macroinvertebrate community, key ecosystem functions such as decomposition rates and primary productivity, and freshwater properties such as turbidity. In a controlled outdoor mesocosm experiment that ran for 33 days, impacts on biodiversity, ecosystem functioning and properties were compared between a native, endangered crayfish (Austropotamobius pallipes) and two invasive alien decapods: the crayfish Pacifastacus leniusculus and crab Eriocheir sinensis. Equal densities of these decapod species were compared between mesocosms, with a replicated array of decapod free controls. Measurements included macroinvertebrate densities, decomposition of leaf litter, production of biofilms, plankton, macrophytes, gross primary productivity, turbidity, and dissolved nutrients. While taxonomic richness of non‐decapod macroinvertebrates was marginally higher in the invasive alien treatments, differences in Shannon diversity were negligible, and β‐diversity was higher for the invasive alien crab. Gastropod density was reduced in the benthos of invasive alien treatments. This was associated with increased primary productivity of periphyton, particularly in the presence of P. leniusculus. Increased turbidity was, however, inversely correlated with periphyton primary productivity in the E. sinensis treatment. Nitrate concentration was significantly lower in invasive compared to native crayfish mesocosms, but similar to decapod free controls. This reflects the potential for the invasive crayfish to act as a nitrogen sink, mediated through both enhanced periphyton and reduced nitrogen recycling. Other processes, such as decomposition rates, sediment respiration, community respiration, and gross primary productivity, did not differ between treatments. This study demonstrates impacts of both native and invasive alien decapod species on certain aspects of benthic biodiversity and ecosystem processes, but with many of these parameters unaffected. This assumes equal densities of each species in its environment. The enhanced gastropod predation and associated trophic cascade by invasive decapods are likely explained through higher consumption rates, metabolism and activity. These per‐capita impacts are likely to be exacerbated further in‐situ due to typically higher densities of invasive compared to native crayfish.

show abstract

Section: Discussionsupporting

confidence: 78%

Section: Strong Regulation Of Invertebrate Communities By E Sinensissupporting

confidence: 78%

Multi‐faceted impacts of native and invasive alien decapod species on freshwater biodiversity and ecosystem functioning

et al. 2018

View full text Add to dashboard Cite

show abstract

“…Empirical studies show that greater magnitude FRs (i.e. high attack rates, low handling times, high maximum feeding rates) produce higher ecological impact on prey populations (Bollache et al 2008;Dick et al 2013;Taylor and Dunn 2018). Importantly, FRs offer a framework (Dick et al 2014(Dick et al , 2017Cuthbert et al 2018a, b) to compare interaction strengths between different consumers whilst deciphering context dependencies, such as multiple predator effects (MPEs; see Sentis and Boukal 2018) and environmental change (e.g.…”

Section: Introductionmentioning

confidence: 99%

Assessing multiple predator, diurnal and search area effects on predatory impacts by ephemeral wetland specialist copepods

et al. 2019

View full text Add to dashboard Cite

Predator-prey interaction strengths can be highly context-dependent. In particular, multiple predator effects (MPEs), variations in predator sex and physical habitat characteristics may affect prey consumption rates and thus the persistence of lower trophic groups. Ephemeral wetlands are transient ecosystems in which predatory copepods can be numerically dominant. We examine the interaction strengths of a specialist copepod Paradiaptomus lamellatus towards mosquito prey in the presence of conspecifics using a functional response approach. Further, we examine sex variability in predation rates of P. lamellatus under circadian and surface area variations. Then, we assess the influence of a cooccurring heterospecific predatory copepod, Lovenula raynerae, on total predation rates. We demonstrate MPEs on consumption, with antagonism between conspecific P. lamellatus predatory units evident, irrespective of prey density. Furthermore, we show differences between sexes in interaction strengths, with female P. lamellatus significantly more voracious than males, irrespective of time of day and experimental arena surface area. Predation rates by P. lamellatus were significantly lower than the heterospecific calanoid copepod L. raynerae, whilst heterospecific copepod groups exhibited the greatest Handling Editor: Télesphore Sime-Ngando.

show abstract

“…Such relationships have often been related to impact of crayfish on their native counterparts. For example, the functional response of invasive signal crayfish on amphipod prey has been higher compared to white‐clawed crayfish ( Austropotamobius pallipes ) (Haddaway et al, ; Taylor & Dunn, ). In our case, however, we studied an established, invasive species and a recently arrived novel species (i.e.…”

Section: Discussionmentioning

confidence: 99%

Towards a mechanistic understanding of individual‐level functional responses: Invasive crayfish as model organisms

Linzmaier

Jeschke

2019

Freshwater Biology

View full text Add to dashboard Cite

In novel communities, a rising number of new and emerging invasive species interact with resident species, some of which are non‐native themselves. We implemented an innovative trophic interaction framework for novel communities and quantified the interaction strength and impact potential of a truly novel species (marbled crayfish Procambarus virginalis) with a resident non‐native counterpart (spiny‐cheek crayfish Faxonius limosus). As prey, we used Dreissena mussels, which are non‐native as well and now hold a key position in many European and North American aquatic ecosystems. For both crayfish species, we predicted functional responses based on a mechanistic model that we parameterised with a set of experimental observations of foraging behaviour and satiation. We compared these predicted functional responses to empirically observed responses. In addition, we incorporated behavioural traits such as aggression, activity, and boldness in the comparisons between the species and individuals to determine their influence on functional responses. We tested individuals from aquarium stocks as well as naturalised individuals from invaded water bodies. Altogether, we performed 1,095 experiments with 26 individual crayfish. We found that per capita predation of spiny‐cheek crayfish exceeded that of marbled crayfish from aquaria and naturalised individuals. Functional responses differed between species and were mostly higher for spiny‐cheek crayfish males. Marbled crayfish, however, were more voracious and reached satiation more slowly. Consumption rates correlated with aggression for marbled crayfish and with an aggressive threat response for spiny‐cheek crayfish. We conclude that spiny‐cheek crayfish can reach higher short‐term consumption rates than marbled crayfish, but both species probably do not substantially affect Dreissena mussel populations in the field. For marbled crayfish, high long‐term consumption, interspecific aggression, and reproduction rates can promote their establishment and spread. Risk assessments of these invaders should be improved by considering numerical responses, and different prey organisms and predators.

show abstract

Predatory impacts of alien decapod Crustacea are predicted by functional responses and explained by differences in metabolic rate

Cited by 20 publications

References 81 publications

Multi‐faceted impacts of native and invasive alien decapod species on freshwater biodiversity and ecosystem functioning

Multi‐faceted impacts of native and invasive alien decapod species on freshwater biodiversity and ecosystem functioning

Assessing multiple predator, diurnal and search area effects on predatory impacts by ephemeral wetland specialist copepods

Towards a mechanistic understanding of individual‐level functional responses: Invasive crayfish as model organisms

Contact Info

Product

Resources

About