Warming mediates the relationship between plant nutritional properties and herbivore functional responses

Xu, Meng; Dick, Jaimie T. A.; Ricciardi, Anthony; Miao, Fei; Zhang, Canyu; Gu, Donghong; Mu, Xuemei; Luo, Dehai; Wei, Hui; Hu, Yinchang

doi:10.1002/ece3.2602

Cited by 10 publications

(4 citation statements)

References 56 publications

(111 reference statements)

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“…In our laboratory study, both native and introduced species conformed with a Type II functional response, consistent with previous studies (e.g. Xu et al 2016aXu et al , 2016bPusack et al 2018). Type II curves are important from the context of population regulation of the resource, as relative risk to prey increases as prey density declines, destabilizing the interaction ).…”

Section: Discussionsupporting

confidence: 90%

“…Dahirel et al 2015;Kiss 2017;Cordoba et al 2018). To date, only a limited number of studies have addressed functional responses of land snails (see Broekhuizen et al 2002;Haubois et al 2005;Giacoletti et al 2016;Xu et al 2016aXu et al , 2016bPusack et al 2018). In our laboratory study, both native and introduced species conformed with a Type II functional response, consistent with previous studies (e.g.…”

Section: Discussionmentioning

confidence: 99%

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Comparative feeding behaviour of native and introduced terrestrial snails tracks their ecological impacts

Hoxha¹,

Crookes²,

MacIsaac³

et al. 2019

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A developing body of theory and empirical evidence suggest that feeding behaviour as measured by the functional response (FR) can assist researchers in assessing the relative potential, ecological impacts and competitive abilities of native and introduced species. Here, we explored the FRs of two land snails that occur in south-western Ontario, one native (Mesodon thyroidus) and one non-indigenous (Cepaea nemoralis) to Canada. The non-indigenous species appears to have low ecological impact and inferior competitive abilities. Consistent with theory, while both species conformed to Type II functional responses, the native species had a significantly higher attack rate (5.30 vs 0.41, respectively) and slightly lower handling time (0.020 vs 0.023), and hence a higher maximum feeding rate (50.0 vs 43.5). The non-indigenous species exhibited a significantly longer time to contact for a variety of food types, and appeared less discriminating of paper that was offered as a non-food type. The non-indigenous species also ate significantly less food when in mixed species trials with the native snail. These feeding patterns match the known low ecological impact of the introduced snail and are consistent with the view that it is an inferior competitor relative to the native species. However, field experimentation is required to clarify whether the largely microallopatric distributions of the two species in south-western Ontario reflect competitive dominance by the native species or other factors such as habitat preference, feeding preferences or predator avoidance. The relative patterns of feeding behaviour and ecological impact are, however, fully in line with recent functional response theory and application. Tedi Hoxha et al. / NeoBiota 47: 81-94 (2019) 82 A peer-reviewed open-access journal NeoBiota

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Section: Discussionsupporting

confidence: 90%

Section: Discussionmentioning

confidence: 99%

Comparative feeding behaviour of native and introduced terrestrial snails tracks their ecological impacts

Hoxha¹,

Crookes²,

MacIsaac³

et al. 2019

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“…While FR analyses have been used mainly to determine the impacts of alien predators (see Dick et al 2014;Dick et al 2017b), they may also be used to assess impacts of herbivores (e.g. Xu et al 2016) or any other trophic/taxonomic group (Dick et al 2014). Additionally, FRs can inform about the competitive abili- ties of species and, indeed, competition theory was heavily based on the "functional resource-utilisation responses" of plants (see Tilman 1977;Dick et al 2017a).…”

Section: Discussionmentioning

confidence: 99%

“…Comparative functional responses (CFRs) have been successful in characterising damaging IAS and have proven predictive for those without invasion impact history (Dick et al 2014(Dick et al , 2017b. CFR can also take into account a wealth of context-dependencies and interactive effects, such as dissolved oxygen levels (Laverty et al 2015), habitat complexity (Wasserman et al 2016), temperature (Xu et al 2016;Cuthbert et al 2018), higher order predators (Barrios-O'Neill et al 2014) and presence of parasites (Laverty et al 2017b). However, despite the many advantages of the CFR methodology, the impacts of a consumer on resources (e.g.…”

Section: Introductionmentioning

confidence: 99%

Assessing the relative potential ecological impacts and invasion risks of emerging and future invasive alien species

Dickey¹,

Cuthbert²,

Rea³

et al. 2018

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Invasive alien species (IAS) cause myriad negative impacts, such as ecosystem disruption, human, animal and plant health issues, economic damage and species extinctions. There are many sources of emerging and future IAS, such as the poorly regulated international pet trade. However, we lack methodologies to predict the likely ecological impacts and invasion risks of such IAS which have little or no informative invasion history. This study develops the Relative Impact Potential (RIP) metric, a new measure of ecological impact that incorporates per capita functional responses (FRs) and proxies for numerical responses (NRs) associated with emerging invaders. Further, as propagule pressure is a determinant of invasion risk, we combine the new measure of Pet Propagule Pressure (PPP) with RIP to arrive at a second novel metric, Relative Invasion Risk (RIR). We present methods to calculate these metrics and to display the outputs on intuitive bi- and triplots. We apply RIP/RIR to assess the potential ecological impacts and invasion risks of four commonly traded pet turtles that represent emerging IAS: Trachemysscriptascripta, the yellow-bellied slider; T.s.troostii, the Cumberland slider; Sternotherusodoratus, the common musk turtle; and Kinosternonsubrubrum, the Eastern mud turtle. The high maximum feeding rate and high attack rate of T.s.scripta, combined with its numerical response proxies of lifespan and fecundity, gave it the highest impact potential. It was also the second most readily available according to our UK surveys, indicating a high invasion risk. Despite having the lowest maximum feeding rate and attack rate, S.odoratus has a high invasion risk due to high availability and we highlight this species as requiring monitoring. The RIP/RIR metrics offer two universally applicable methods to assess potential impacts and risks associated with emerging and future invaders in the pet trade and other sources of future IAS. These metrics highlight T.s.scripta as having high impact and invasion risk, corroborating its position on the EU list of 49 IAS of Union Concern. This suggests our methodology and metrics have great potential to direct future IAS policy decisions and management. This, however, relies on collation and generation of new data on alien species functional responses, numerical responses and their proxies, and imaginative measures of propagule pressure.

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Gimme Shelter: differential utilisation and propagule creation of invasive macrophytes by native caddisfly larvae

et al. 2020

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In aquatic systems, invasive submerged macrophytes considerably alter the structure and functioning of communities, thus potentially compromising ecosystem services. The prolific spread of invasive macrophytes is often aided by vegetative fragment propagation, yet the contributions of various commonly occurring invertebrates to such fragmentation are often unquantified. In the present study, we examine fragmentary spread of invasive macrophytes by a group of shredder-herbivores, larval caddisflies. Through novel application of the comparative functional response (FR; resource use as a function of density) approach to the native case-building species Limnephilus lunatus, we compared utilisation of nonnative waterweeds Elodea canadensis and E. nuttallii in mono-and polycultures. Furthermore, we quantified de-cased and cased caddisfly-induced fragment production and length changes among non-native E. canadensis, E. nuttallii, Crassula helmsii and Lagarosiphon major under two different plant orientations: horizontal (floating) versus vertical (upright) growth forms. Larval caddisflies exhibited Type II (hyperbolic) FRs towards both Elodea species, and utilised each plant at similar rates when plants were provided separately. When plant species were presented in combination horizontally, E. canadensis was significantly less utilised compared to E. nuttallii, Kate Crane and Ross N. Cuthbert have contributed equally to this work.

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Warming mediates the relationship between plant nutritional properties and herbivore functional responses

Cited by 10 publications

References 56 publications

Comparative feeding behaviour of native and introduced terrestrial snails tracks their ecological impacts

Comparative feeding behaviour of native and introduced terrestrial snails tracks their ecological impacts

Assessing the relative potential ecological impacts and invasion risks of emerging and future invasive alien species

Gimme Shelter: differential utilisation and propagule creation of invasive macrophytes by native caddisfly larvae

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