Preliminary results on the foraging ecology of Balearic shearwaters (&lt;i&gt;Puffinus mauretanicus&lt;/i&gt;) from bird-borne data loggers

Aguilar, Juan Salvador; Benvenuti, Simone Messerotti; Dall’Antonia, Luigi; McMinn-Grive, Miguel; Mayol-Serra, J

doi:10.3989/scimar.2003.67s2129

Cited by 13 publications

(9 citation statements)

References 26 publications

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“…Great shearwaters consume large amounts of squids [32], [33], [34], but where and when they obtain this prey is unknown and our data suggest little to no nocturnal diving by this species, as has been reported for other Puffinus shearwaters [12], [13]. Instead, great shearwaters showed increased diving frequency around dawn and dusk - similar to patterns reported for sooty shearwaters [11].…”

Section: Discussionsupporting

confidence: 82%

“…More recently, dives of sooty shearwater ( P. griseus ) have been recorded using archival tags sampling every 24 to 32 seconds [11] , [12] . The use of high sampling rate time-depth-recorders (TDRs), which trace individual dives and record time spent at various depths, have been used on only one Balearic shearwater ( P. mauretanicus ) sampling depth every 4 seconds [13] . Thus, very little is known about the diving ecology of this genus.…”

Section: Introductionmentioning

confidence: 99%

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Diving of Great Shearwaters (Puffinus gravis) in Cold and Warm Water Regions of the South Atlantic Ocean

2010

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BackgroundAmong the most widespread seabirds in the world, shearwaters of the genus Puffinus are also some of the deepest diving members of the Procellariiformes. Maximum diving depths are known for several Puffinus species, but dive depths or diving behaviour have never been recorded for great shearwaters (P. gravis), the largest member of this genus. This study reports the first high sampling rate (2 s) of depth and diving behaviour for Puffinus shearwaters.Methodology/Principal FindingsTime-depth recorders (TDRs) were deployed on two female great shearwaters nesting on Inaccessible Island in the South Atlantic Ocean, recording 10 consecutive days of diving activity. Remote sensing imagery and movement patterns of 8 males tracked by satellite telemetry over the same period were used to identify probable foraging areas used by TDR-equipped females. The deepest and longest dive was to 18.9 m and lasted 40 s, but most (>50%) dives were <2 m deep. Diving was most frequent near dawn and dusk, with <0.5% of dives occurring at night. The two individuals foraged in contrasting oceanographic conditions, one in cold (8 to 10°C) water of the Sub-Antarctic Front, likely 1000 km south of the breeding colony, and the other in warmer (10 to 16°C) water of the Sub-tropical Frontal Zone, at the same latitude as the colony, possibly on the Patagonian Shelf, 4000 km away. The cold water bird spent fewer days commuting, conducted four times as many dives as the warm water bird, dived deeper on average, and had a greater proportion of bottom time during dives.Conclusions/SignificanceGeneral patterns of diving activity were consistent with those of other shearwaters foraging in cold and warm water habitats. Great shearwaters are likely adapted to forage in a wide range of oceanographic conditions, foraging mostly with shallow dives but capable of deep diving.

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Section: Discussionsupporting

confidence: 82%

Section: Introductionmentioning

confidence: 99%

Diving of Great Shearwaters (Puffinus gravis) in Cold and Warm Water Regions of the South Atlantic Ocean

2010

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“…For example, the southern ocean is home to many of the most proficient diving seabirds, which are capable of retrieving baited hooks at considerable distances. For instance, some Puffinus species have been recorded diving to maximum depths of 35.4 and 70.6 m (Weimerskirch and Cherel 1998;Keitt et al 2000;Burger 2001;Aguilar et al 2003). The white-chinned petrel (Procellaria aequinoctialis, Procellariidae), a common bycatch species, has a recorded maximum dive depth of 12.8 m (Huin 1994).…”

Section: Time Of Setting 48mentioning

confidence: 99%

“…For instance, some Puffinus species have been recorded diving to maximum depths of 35.4 and 70.6 m (Weimerskirch and Cherel 1998; Keitt et al. 2000; Burger 2001; Aguilar et al. 2003).…”

Section: Introductionmentioning

confidence: 99%

Reducing seabird bycatch in longline, trawl and gillnet fisheries

Bull

2007

Fish and Fisheries

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Introduction 32Results of reviewed mitigation methods 35Mitigation methods relevant to multiple fisheries 35Offal and discard management 35 Area/seasonal closures 36 Longlining 36 Underwater setting devices 36 Funnel (lining tube) 36 Chute 37 AbstractWith an increasing number of seabird species, particularly albatross and petrels, becoming threatened, a reduction of fishery impacts on these species is essential for their future survival. Here, mitigation methods to reduce and avoid seabird bycatch are assessed in terms of their ability to reduce bycatch rates and their economic viability for longline, trawl and gillnet fisheries worldwide. Factors influencing the appropriateness and effectiveness of a mitigation device include the fishery, vessel, location, seabird assemblage present and season of year. As yet, there is no single magic solution to reduce or eliminate seabird bycatch across all fisheries: a combination of measures is required, and even within a fishery there is likely to be refinement of techniques by individual vessels in order to maximize their effectiveness at reducing seabird bycatch. In longline demersal and pelagic fisheries, a minimum requirement of line weighting that achieves hook sink rates minimizing seabird bycatch rates should be tailored with a combination of strategic offal and discard management, bird-scaring lines (BSLs) and night-setting, particulary in Southern Hemisphere fisheries. Urgent investigation is needed into more effective measures at reducing seabird interactions with trawl nets and gill nets. In trawl fisheries, a combination of offal and discard management, the banning of net monitoring cables, paired BSLs, and a reduction in the time the net is on or near the surface are likely to be the most effective in reducing seabird interactions with the warp cables and net. Few seabird bycatch reduction methods have been developed for gillnet fisheries, although increasing the visibility of the net has been shown to reduce seabird bycatch. Further studies are required to determine the efficacy of this technique and its influence on target species catch rates.

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“…This can be explained by the greater diving ability of the different shearwater species compared to gull species which only feed on surface. Shearwaters can dive several metres and reach baited hooks at a considerable distance astern (mean ± SD; Scopoli’s shearwater: 0.78 ± 0.79 m [ 45 ], Balearic shearwater: 5.6 ± 4.1 m [ 46 ]). Indeed, Puffinus shearwaters can dive > 10 m depth (up to 28 m) [ 22 ], which means that according to the sinking rates recorded in the present study, shearwaters could still reach baited hooks after the 45 m covered by the streamers lines (when baited hooks are at 2 m depth) and up to 190 m behind the vessel (10 m depth).…”

Section: Discussionmentioning

confidence: 99%

Seabird bycatch mitigation trials in artisanal demersal longliners of the Western Mediterranean

Cortés

González‐Solís

2018

PLoS ONE

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High numbers of seabirds are killed annually worldwide in longline fisheries. In the Mediterranean, this mortality is seriously affecting the viability of seabird populations, in particular of the three endemic shearwaters. Even so, there is currently no specific seabird mitigation requirements for the longline fleet operating in this area. From 2013 to 2014, we assessed the efficiency and practical applicability of four mitigation measures on artisanal demersal longliners targeting European hake (Merluccius merluccius) in the western Mediterranean: night setting, tori line, weighted lines and artificial baits. We performed fifty-two pairs of experimental (with the tested mitigation measure) and control settings (without any measure), and compared their effects on seabird interactions and fish catches. In addition, we estimated the longline sink rates and the seabird access area to baited hooks in different longline configurations. Night setting reduced bycatch risk without affecting target and non-commercial fish catches. The tori line may have reduced the bycatch risk by displacing bait attacks beyond the end of the line, but at this distance shearwaters could still access to the baits and the streamers did not deter birds under calm wind conditions. Weighted lines increased sink rate, but it resulted in only a minor reduction of the seabird access window to baited hooks and led to some operational problems during the setting. Artificial baits substantially reduced commercial catches. Moreover, the seabird access to the baited hooks was influenced by the longline configuration, the setting speed and the relative position to the floats and weights. So far, night setting stands out as the best mitigation measure for reducing bycatch levels without compromising target catches in demersal longliners. Ideally, these results should be confirmed in longliners targeting species other than European hake.

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Preliminary results on the foraging ecology of Balearic shearwaters (<i>Puffinus mauretanicus</i>) from bird-borne data loggers

Cited by 13 publications

References 26 publications

Diving of Great Shearwaters (Puffinus gravis) in Cold and Warm Water Regions of the South Atlantic Ocean

Diving of Great Shearwaters (Puffinus gravis) in Cold and Warm Water Regions of the South Atlantic Ocean

Reducing seabird bycatch in longline, trawl and gillnet fisheries

Seabird bycatch mitigation trials in artisanal demersal longliners of the Western Mediterranean

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