Diving behaviour of white-chinned petrels and its relevance for mitigating longline bycatch

Rollinson, D. P.; Dilley, Ben J.; Ryan, Peter G.

doi:10.1007/s00300-014-1521-y

Cited by 25 publications

(21 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Sink rates were calculated for 0–2 m, 2–4 m and 4–10 m depth strata and compared among treatments using a nonparametric Kuskal–Wallis test, followed by a Dunn test (‘Bonferroni’ method). Depth strata were classified as lowest to highest risk of seabirds attempting to retrieve sinking hooks, based on diving capabilities of albatrosses and medium‐sized petrels (Prince, Huin, & Weimerskirch, ; Rollinson, Dilley, & Ryan, ). Baited hooks in the 0–2 m depth stratum are accessible to all albatrosses and petrels, although the diving range of Diomedea spp.…”

Section: Methodsmentioning

confidence: 99%

“…In the 4–10 m depth range, hooks are mostly available to medium‐sized diving petrels only. Beyond 10 m, the risk of seabirds retrieving baited hooks is reduced considerably; for example, 95% of the recorded white‐chinned petrel Procellaria aequitionctiallis dives were shallower than 7 m (Rollinson et al, ). The mean depths of baited hooks 30 s after deployment were compared using a one‐way ANOVA.…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Improved line weighting reduces seabird bycatch without affecting fish catch in the Brazilian pelagic longline fishery

Santos

Silva-Costa

Sant’Ana

et al. 2019

Aquatic Conservation

View full text Add to dashboard Cite

1. Increasing the sink rate of baited hooks by adding weights in close proximity to the hook is crucial to reduce seabird mortality in pelagic longline fisheries. However, weights placed next to the hook are a cause for concern for fishing crew because they can fly back in the event of a line break, injuring deck crew.2. Lumo Leads, an alternative weight system designed to slide in the event of a line break, and therefore prevent accidents, were trialled in pelagic longline fisheries off southern Brazil. Four fishing trips were conducted and 26,377 hooks sampled to compare sink rates, seabird bycatch rates and catch rates of target species between three treatments: (1) 60 g Lumo Lead attached at 1.0 m from the hook;(2) 60 g Lumo Lead at 3.5 m; and (3) 60 g leaded swivels at 3.5 m from the hook. A LumoLead placed at 1.0 m from the hook resulted in a faster sink rate and caught fewer seabirds (0.11 birds per unit of effort [BPUE]) when compared with a Lumo Lead (0.33 BPUE) or weighted swivel (0.85 BPUE) placed at 3.5 m. The bycatch with Lumo Lead placed at 1.0 m from the hook was 90% lower than the bycatch of Lumo Lead or weighted swivel placed at 3.5 m combined. There was no difference in the catch rates of target species between the three treatments.4. These findings support a growing body of evidence that placing weights close to the hook reduces seabird bycatch without affecting the catchability of the target species. The high seabird bycatch rates recorded despite night setting and recommended line weighting regimes reinforces the need of simultaneous deployment of a toriline with these other two mitigation measures to reduce seabird bycatch to negligible levels in the south-west Atlantic.

show abstract

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Improved line weighting reduces seabird bycatch without affecting fish catch in the Brazilian pelagic longline fishery

Santos

Silva-Costa

Sant’Ana

et al. 2019

Aquatic Conservation

View full text Add to dashboard Cite

show abstract

“…Finally, emperor penguins (Aptenodytes forsteri) were studied at various colonies along the coast of the Antarctic continent (Wienecke et al, 2007). Albatrosses and diving petrels were studied at South Georgia and the South Orkney Islands (Phillips et al, 2005Rollinson et al, 2014). The only site where the diving ability of cormorants (Phalacrocorax spp.)…”

Section: Usage In Southern Ocean Speciesmentioning

confidence: 99%

View From Below: Inferring Behavior and Physiology of Southern Ocean Marine Predators From Dive Telemetry

et al. 2018

View full text Add to dashboard Cite

Air-breathing marine animals, such as seals and seabirds, undertake a special form of central-place foraging as they must obtain their food at depth yet return to the surface to breathe. While telemetry technologies have advanced our understanding of the foraging behavior and physiology of these marine predators, the proximate and ultimate influences controlling the diving behavior of individuals are still poorly understood. Over time, a wide variety of analytical approaches have been developed for dive data obtained via telemetry, making comparative studies and syntheses difficult even amongst closely-related species. Here we review publications using dive telemetry for 24 species (marine mammals and seabirds) in the Southern Ocean in the last decade (2006)(2007)(2008)(2009)(2010)(2011)(2012)(2013)(2014)(2015)(2016). We determine the key questions asked, and examine how through the deployment of data loggers these questions are able to be answered. As part of this process we describe the measured and derived dive variables that have been used to make inferences about diving behavior, foraging, and physiology. Adopting a question-driven orientation highlights the benefits of a standardized approach for comparative analyses and the development of models. Ultimately, this should promote robust treatment of increasingly complex data streams, improved alignment across diverse research groups, and also pave the way for more integrative multi-species meta-analyses. Finally, we discuss key emergent areas in which dive telemetry data are being upscaled and more quantitatively integrated with movement and demographic information to link to population level consequences.

show abstract

“…White-chinned petrels are proficient divers, capable of reaching 16 m deep [12]. However, <1% of dives attain this depth, the majority (95%) being ≤6 m deep.…”

Section: Target Depth Standardsmentioning

confidence: 99%

“…However, <1% of dives attain this depth, the majority (95%) being ≤6 m deep. Diving at 1.5 m/s [12] a white-chinned petrel would take 6.7 seconds to reach 10 m deep. Baited hooks on conventionally weighted branch lines (60 g lead weight 3.5 m from the hook) released ≥6 m underwater averaged 0.41 ± 0.01 m/s (s.e.…”

Section: Target Depth Standardsmentioning

confidence: 99%

The Development and Operational Testing of an Underwater Bait Setting System to Prevent the Mortality of Albatrosses and Petrels in Pelagic Longline Fisheries

Robertson¹,

Ashworth²,

Ashworth³

et al. 2015

OJMS

View full text Add to dashboard Cite

Longline fisheries for tunas and tuna-like species present an existential threat to many populations of albatrosses and petrels worldwide. To prevent this form of mortality we developed a new technology designed to deploy baited hooks underwater beyond the dive depths of seabirds (6 -10 m for the species most commonly caught). The underwater bait setter is a stern-mounted, hydraulically-operated and computer-controlled device that catapults baited hooks underwater in a steel capsule connected to hydraulic winches by Spectra ® rope. Baits are flushed from the capsule by water pressure through a spring-loaded bait release door. The chief engineering challenges in the developmental stages were ensuring: 1) bait delivery to target depths with cycle times (time from release to recovery) that were practical for fishing operations; 2) bait retention in the capsule (no drop-outs) on the descent phase of the cycle; 3) baits, upon release at target depth, were not drawn up the water column on the capsule recovery phase (from possible hook-ups and/or suction); and 4) the retention of baits on hooks post-release from the capsule was not affected by the mechanical release underwater. Operational trials with the final version of the capsule yielded satisfactory cycle times to depths of 6 -10 m. All baits were retained in the capsule on the descent and released as required at target depths (n = 606 deployments). Bait retention on hooks post release from the capsule and retention on hooks hand-set at the surface (the conventional method) were statistically indistinguishable. The underwater bait setter is modular in construction and can be fitted to all types of vessel sterns.

show abstract

Diving behaviour of white-chinned petrels and its relevance for mitigating longline bycatch

Cited by 25 publications

References 36 publications

Improved line weighting reduces seabird bycatch without affecting fish catch in the Brazilian pelagic longline fishery

Improved line weighting reduces seabird bycatch without affecting fish catch in the Brazilian pelagic longline fishery

View From Below: Inferring Behavior and Physiology of Southern Ocean Marine Predators From Dive Telemetry

The Development and Operational Testing of an Underwater Bait Setting System to Prevent the Mortality of Albatrosses and Petrels in Pelagic Longline Fisheries

Contact Info

Product

Resources

About