Daniel Barrios-O'Neill

Daniel Barrios-O'Neill
Queen's University Belfast | QUB · School of Biological Sciences

BSc, PhD

About

35
Publications
9,092
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Introduction
My research to date has centred on using novel functional response-based experiments to understand why certain invasive species are successful, and how environmental context-dependencies mediate their impacts. I have focused on aquatic study systems, particularly invasive amphipods and mysids from the Ponto-Caspian region, but my research is often grounded in basic ecology. In short, invaders present interesting opportunities to test (and probably reject) your latest pet hypothesis.
Additional affiliations
July 2011 - present
Queen's University Belfast
Position
  • PhD Student

Publications

Publications (35)
Article
Full-text available
The stability of consumer-resource systems can depend on the form of feeding interactions (i.e. functional responses). Size-based models predict interactions—and thus stability—based on consumer-resource size-ratios. However, little is known about how interaction contexts (eg simple or complex habitats) might alter scaling relationships. Addressing...
Article
Predator-prey interactions are mediated by the structural complexity of habitats, but disentangling the many facets of structure that contribute to this mediation remains elusive. In a world replete with altered landscapes and biological invasions, determining how structure mediates the interactions between predators and novel prey will contribute...
Article
Emergent multiple predator effects (MPEs) might radically alter predictions of predatory impact that are based solely on the impact of individuals. In the context of biological invasions, determining if and how the individual-level impacts of invasive predators relates to their impacts in multiple-individual situations will inform understanding of...
Article
1. The ecological effects of invasive species depend on myriad environmental contexts, rendering understanding problematic. Functional responses provide a means to quantify resource use by consumers over short timescales and could therefore provide insight into how the effects of invasive species vary over space and time. Here, we use novel in situ...
Article
Agriculture, over‐exploitation and urbanisation remain the major threats to biodiversity in the Anthropocene. The attention these threats garner among leading environmental NGOs (eNGOs) and the wider public is critical in fostering the political will necessary to reverse biodiversity declines worldwide. Here, I analyse the advocacy of leading eNGOs...
Article
Full-text available
The rate that consumers encounter resources in space necessarily limits the strength of feeding interactions that shape ecosystems. To explore the link between encounters and feeding, we first compiled the largest available dataset of interactions in the marine benthos by extracting data from published studies and generating new data. These data in...
Article
Full-text available
1. Interactions between multiple predators can modify prey risk and profoundly alter ecological community dynamics. Further, ontogenic prey size changes are known to mediate prey risk through refuge effects. Understandings of these biotic factors is important for robust quantifications of natural enemy effects on target species, yet their combined...
Article
Full-text available
Background Variability in the ecological impacts of invasive species across their geographical ranges may decrease the accuracy of risk assessments. Comparative functional response analysis can be used to estimate invasive consumer-resource dynamics, explain impact variability, and thus potentially inform impact predictions. The European green crab...
Data
Relationship between water temperature and number of prey killed by green crab Relationship between the number of mussels killed by European green crab and mean average water temperature per trial (start temperature + end temperature/2), for the highest mussel density only (n = 64 mussels).
Data
Functional response curves for European green crab preying on mussels (Mytilus spp.) from nine populations sampled in four regions Functional response curves, modeled from the raw data (open symbols) with a Type II Rogers random predator equation without prey replacement, for nine populations of European green crab preying on mussels (Mytilus spp.)...
Data
Statistical comparisons of bootstrapped regional parameter estimates, attack rate a and handling time h Select statistical comparisons of parameter estimates, attack rate a and handling time h, for pairs of regions (see 3A–3B). For every iteration of the bootstrap (n = 2,000) we calculated the difference between the parameter estimates for each reg...
Data
Raw data used for functional response models and GLMMs “FR Experiment Data” includes experimental conditions, green crab morphological measurements, and mussel consumption (see “metadata-frs” for detailed descriptions of column headers). “Mussel Morphology Data” includes morphological measurements and calculated shell thickness index for a random s...
Data
Predicted proportion of mussels killed by European green crabs in relation to prey density, claw size (mm), and the region of origin, derived from a modified version of the top generalized linear mixed-effects model The predicted proportion of mussels killed by European green crabs (with 95% confidence intervals) in relation to (A) prey density, (B...
Data
Parameter estimates of attack rate a and handling time h for European green crabs from nine populations feeding on mussels Parameter estimates (±95% CI) of (A) attack rate a, and (B) handling time h for bootstrapped (n = 2,000) Type II functional response curves of European green crab, from nine populations within four regions, preying on varying d...
Data
Additional information on European green crab collection sites and methods of collection Locations and methods of green crab collections for each of four study regions: British Columbia, Canada (BC); Nova Scotia, Canada (NS); South Africa (SA); and Northern Ireland, UK (NI).
Article
Full-text available
The ecological implications of biotic interactions, such as predator-prey relationships, are often context-dependent. Comparative functional responses analysis can be used under different abiotic contexts to improve understanding and prediction of the ecological impact of invasive species. Pterois volitans (Lionfish) [Linnaeus 1758] is an establish...
Article
Full-text available
1. Predictions of the identities and ecological impacts of invasive alien species are critical for risk assessment, but presently we lack universal and standardized metrics that reliably predict the likelihood and degree of impact of such invaders (i.e. measureable changes in populations of affected species). This need is especially pressing for em...
Article
Apex predator reintroductions are commonly motivated by the imperative to restore populations and wider ecosystem function by precipitating trophic cascades that release basal species. Yet evidence for the existence of such cascades is often equivocal, particularly where consumptive interactions between apex and intermediate predators are weak or a...
Article
1. Predictions of the identities and ecological impacts of invasive alien species are critical for risk assessment, but presently we lack universal and standardized metrics that reliably predict the likelihood and degree of impact of such invaders (i.e. measurable changes in populations of affected species). This need is especially pressing for eme...
Article
Full-text available
We contend that invasion ecology requires a universal, measurable trait of species and their interactions with resources that predicts key elements of invasibility and ecological impact; here, we advocate that functional responses can help achieve this across taxonomic and trophic groups, among habitats and contexts, and can hence help unify dispar...
Article
Full-text available
Vonesh et al. (2017) in their critique of Dick et al. (2017) erect a straw man with their thought experiment; they look for reasons why comparative functional response (CFR) might fail, when CFR clearly and repeatedly succeeds.
Article
Full-text available
Invasive species management requires allocation of limited resources towards the proactive mitigation of those species that could elicit the highest ecological impacts. However, we lack predictive capacity with respect to the identities and degree of ecological impacts of invasive species. Here, we combine the relative per capita effects and relati...
Article
Consumer-resource interactions (i.e. the functional response) underpin decades of ecological advancements. However, selecting, fitting and comparing functional response models using appropriate methods remains a non-trivial endeavour. The R package FRAIR provides tools for selecting and differentiating various forms of consumer functional response...
Article
Full-text available
Ephemeral aquatic environments are important habitats for a variety of species. They are highly variable with regards to vegetation structure and physico-chemical features that potentially mediate outcomes of biotic interactions. Multiple environmental variables and their emergent impacts on the relationship between prey consumption rate by a preda...
Article
Full-text available
The present study assessed the functional responses of two predatory ephemeral pond specialist copepods, Lovenula raynerae and Paradiaptomus lamellatus towards their natural prey Daphnia longispina. Lovenula raynerae exhibited an elevated overall functional response compared with that of P. lamellatus. In addition, L. raynerae exhibited a Type II f...
Article
Full-text available
Biological invasions continue to exert pressure on ecosystems worldwide and we thus require methods that can help understand and predict the impacts of invasive species, on both native species and previously established invaders. Comparing labora- tory derived functional responses among invasive and native predators has emerged as one such method,...

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