Effect of pelagic longline bait type on species selectivity: a global synthesis of evidence

Gilman, Eric; Chaloupka, Milani; Bach, Pascal; Fennell, Hannah; Hall, Martín; Musyl, Michael K.; Piovano, Susanna; Poisson, François; Song, Liming

doi:10.1007/s11160-020-09612-0

Cited by 32 publications

(33 citation statements)

References 103 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…When considering management and conservation, data on vertical distributions can inform us of a species’ vulnerability to anthropogenic threats, which is particularly relevant for elasmobranchs given that they can be subject to both targeted fisheries and bycatch worldwide ( 8 , 9 ). For example, capture probabilities and levels of mortality are influenced by depth overlap between elasmobranchs and fishing gears ( 10 ), as well as gear selectivity ( 11 ) and species physiology ( 12 ). Data on vertical distributions can consequently inform encounter rates and catchability with various fishing gears and inform potential mitigation measures to reduce bycatch of vulnerable species while maintaining capture of fishery targets ( 10 ).…”

Section: Introductionmentioning

confidence: 99%

Diving into the vertical dimension of elasmobranch movement ecology

et al. 2022

Self Cite

View full text Add to dashboard Cite

Knowledge of the three-dimensional movement patterns of elasmobranchs is vital to understand their ecological roles and exposure to anthropogenic pressures. To date, comparative studies among species at global scales have mostly focused on horizontal movements. Our study addresses the knowledge gap of vertical movements by compiling the first global synthesis of vertical habitat use by elasmobranchs from data obtained by deployment of 989 biotelemetry tags on 38 elasmobranch species. Elasmobranchs displayed high intra- and interspecific variability in vertical movement patterns. Substantial vertical overlap was observed for many epipelagic elasmobranchs, indicating an increased likelihood to display spatial overlap, biologically interact, and share similar risk to anthropogenic threats that vary on a vertical gradient. We highlight the critical next steps toward incorporating vertical movement into global management and monitoring strategies for elasmobranchs, emphasizing the need to address geographic and taxonomic biases in deployments and to concurrently consider both horizontal and vertical movements.

show abstract

Section: Introductionmentioning

confidence: 99%

Diving into the vertical dimension of elasmobranch movement ecology

et al. 2022

Self Cite

View full text Add to dashboard Cite

show abstract

“…First, the HDI + ROPE statistical frameworks we advocate (Kruschke, 2018;Kruschke & Liddell, 2018) are consistent with a more transparent evaluation of evidence than has typically been applied. Ideally, meta-analyses that adopt this framework and consider key predictors of 'success' will help nuance their conclusions, particularly if adopting a Bayesian framework (Gilman et al, 2020) (Figure 5). Second, we suggest a hierarchy of evidence for conservation based on ecological interactions (Figure 5), which builds on the work of Mupepele et al (2016).…”

Section: Discussionmentioning

confidence: 99%

Revisiting the evidentiary basis for ecological cascades with conservation impacts

Mumby

Chaloupka

Bozec

et al. 2021

CONSERVATION LETTERS

Self Cite

View full text Add to dashboard Cite

Complex ecological interactions are widely utilized to deliver conservation benefits but their efficacy is often debated. Using a coral reef trophic cascade as an example, we reveal that outcomes can be surprisingly difficult to detect. Even important impacts of marine reserves can go undetected (20% more coral with power < 0.5). This evidentiary challenge is compounded by misinterpretation of "nonsignificant" results as evidence of failed conservation practice. We illustrate a more appropriate analytical approach using a Bayesian Region of Practical Equivalence (ROPE) whereby many tests of conservation practice would be interpreted correctly as "undecided" rather than "negative." Practitioners working with ecological cascades will increasingly be faced with "undecided" evidence of conservation benefits. Since one solution is to consider a wider diversity of evidence, we provide a hierarchy of evidentiary quality. In this way, even reductionist evidence of the component ecological interactions can be utilized, which is far easier to collect and evaluate.

show abstract

“…solandri ; O'Connell et al, 2014b; O'Connell et al, 2018). Previous research demonstrates that sharks can exhibit a preference for bait type, with certain baits contributing to a greater frequency of attraction/capture with various fishing gears (Driggers et al, 2017; Gilman et al, 2020). Carcharhinus leucas exhibits a wide dietary preference that appears to be ontogenetic (Cliff & Dudley, 1991).…”

Section: Discussionmentioning

confidence: 99%

Evaluating the effects of a SharkSafe Barrier™ shoreline deployment on bull shark (Carcharhinus leucas) behaviour

O’Connell

Gressle²,

Crews

et al. 2021

Aquatic Conservation

View full text Add to dashboard Cite

1. Beach nets and drumlines are lethal devices that are used to minimize the interaction between potentially dangerous sharks and beachgoers. Mortality to these large shark species as a result of these lethal measures has led to the development of non-invasive technologies that may minimize the risks of rare encounters with beachgoers while simultaneously protecting vulnerable sharks and other marine species.2. One such technology is the SharkSafe Barrier™, which uses visual and magnetic stimuli to non-invasively deter sharks from a designated area. Previous experiments using this technology were performed on a small scale (e.g. 13 m Â 13 m), with an attempt made to extrapolate the results to a larger scale application without actual large-scale deployments and experimentation.3. The present study examined whether a large-scale SharkSafe Barrier™ shoreline deployment could successfully exclude the bull shark (Carcharhinus leucas) from acoustic and olfactory cues and evaluated whether the technology could serve as a less invasive replacement to current culling practices.4. Generalized linear mixed-model analyses based on 59 trials illustrate that C. leucas swimming behaviour (i.e. avoidances, entrances, and pass arounds) significantly differed between the control (i.e. unmanipulated area) and the experimental (i.e. SharkSafe Barrier™) regions. Unlike previous small-scale experiments, 10 of 16 sharks repeatedly penetrated the barrier and swam in an accelerated manner once within the experimental barrier region.5. The present findings raise concerns that the size of the previous experimental areas may have been insufficient to provide a realistic representation of barrier efficacy for large-scale deployments. With continued shark-culling measures in various locations, a non-invasive and eco-friendly alternative is needed, but substantial modifications to the current Sharksafe barrier design or an entirely new eco-friendly approach are needed as the barrier in its present state does not reliably deter large and potentially dangerous sharks from a large-scale area.

show abstract

Effect of pelagic longline bait type on species selectivity: a global synthesis of evidence

Cited by 32 publications

References 103 publications

Diving into the vertical dimension of elasmobranch movement ecology

Diving into the vertical dimension of elasmobranch movement ecology

Revisiting the evidentiary basis for ecological cascades with conservation impacts

Evaluating the effects of a SharkSafe Barrier™ shoreline deployment on bull shark (Carcharhinus leucas) behaviour

Contact Info

Product

Resources

About