Spatio-temporal overlap between the at-sea distribution of Southern Giant Petrels and fisheries at the Patagonian Shelf

Copello, Sofía; Quintana, Flavio

doi:10.1007/s00300-009-0620-7

Cited by 36 publications

(20 citation statements)

References 37 publications

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“…This topic has received attention only recently and mainly through the measure of overlap between the at-sea distribution of seabirds (kernel contours or location data) and fishing effort/catch (number of hooks set per year, average annual fishing effort or total catch; Cuthbert et al 2005, Phillips et al 2006, Copello & Quintana 2009, Fischer et al 2009. Only a few studies have analysed associations at a finer temporal or spatial scale: bird tracks overlaid on sanctioned sets or summarized by grid squares based on setting locations (Freeman et al 2001, Nel et al 2002a, Trebilco et al 2008, Thalmann et al 2009) and investigation of behavioral responses using GPS tracking and the vessel monitoring system (VMS; Votier et al 2010).…”

Section: Estimating Overlap Between Petrels and Fisheriesmentioning

confidence: 99%

“…Indeed there is mounting evidence that longline fishing is a major cause of the observed population decreases of many albatrosses and petrels (Weimerskirch et al 1997, Robertson & Gales 1998, Tuck et al 2001, Nel et al 2003, Barbraud et al 2008, SC-CAMLR 2008. Spatial overlap of seabird distribution with commercial fisheries has therefore been used and endorsed by scientists and management authorities as a tool to assess the extent of potential interactions, and thereby bycatch, and to aid in proposing mitigation measures (Cuthbert et al 2005, Phillips et al 2006, Trebilco et al 2008, Copello & Quintana 2009.…”

Section: Introductionmentioning

confidence: 99%

“…When setting conservation goals and priorities in fisheries management in an ecosystemic context, it is important to consider the complex relationships between fisheries and top predators (Cuthbert et al 2005, Phillips et al 2006, Copello & Quintana 2009, Fischer et al 2009, Thalmann et al 2009,Votier et al 2010. Understanding the relationship between the at-sea distribution of white-chinned petrels breeding at Kerguelen and of the fisheries operating in the area is, therefore, of primary conservation concern.…”

Section: Introductionmentioning

confidence: 99%

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At-sea distribution and diet of an endangered top predator: relationship between white-chinned petrels and commercial longline fisheries

Delord¹,

Cotté²,

Péron³

et al. 2010

Endang. Species. Res.

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Incidental seabird mortality associated with longline commercial fishing is a worldwide conservation concern. To develop conservation strategies, it is essential to estimate the likelihood of seabird bycatch and the degree of overlap between birds' foraging grounds and commercial fishing areas. We tracked 21 adult white-chinned petrels Procellaria aequinoctialis breeding on Kerguelen Island, southern Indian Ocean, during their breeding period in 2006 and in 2008. At-sea foraging distribution of white-chinned petrels was mainly confined to Antarctic waters. Commercial longline fisheries targeting toothfish were operating in both the French Exclusive Economic Zone and in other Commission for the Conservation of Antarctic Marine Living Resources areas during the study. We analysed concurrent data on the positions of both birds and vessels to estimate overlap. Static analysis using indices (home-range and utilization distribution overlap) revealed that, at a large scale, spatial and temporal overlap occurred, but varied among areas and with breeding stage. Dynamic analysis (detection of operating vessels respective to bird locations within a time/space window) revealed little overlap at a small scale. Our study revealed a mismatch between large-and small-scale overlap estimates, suggesting that birds and vessels occupy the same overall zone with infrequent co-occurrence (19% of birds in the vicinity of vessels). This result was confirmed by the relatively low occurrence of fishery-related items (4 to 22%) in chick food samples. However, given the large size of seabird populations, overall, large numbers of birds overlap with vessels, and management authorities should maintain and promote the implementation of strict mitigation measures to further reduce bycatch.

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Section: Estimating Overlap Between Petrels and Fisheriesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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At-sea distribution and diet of an endangered top predator: relationship between white-chinned petrels and commercial longline fisheries

Delord¹,

Cotté²,

Péron³

et al. 2010

Endang. Species. Res.

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“…-646 44 42 24 71 320 222 data). Similarly, it has been argued that the use of discards provided by trawlers operating at Golfo San Jorge and the Patagonian shelf may be one of the factors determining the increase of southern giant petrel populations breeding in the area (Quintana et al 2006, Copello & Quintana 2009). Southern giant petrels breeding at Golfo San Jorge show a strong association to all trawl fisheries operating in the area (Copello & Quintana 2009) and regularly include discards in their diet (Copello & Quintana 2003, Copello et al 2008.…”

Section: Discussionmentioning

confidence: 99%

“…Similarly, it has been argued that the use of discards provided by trawlers operating at Golfo San Jorge and the Patagonian shelf may be one of the factors determining the increase of southern giant petrel populations breeding in the area (Quintana et al 2006, Copello & Quintana 2009). Southern giant petrels breeding at Golfo San Jorge show a strong association to all trawl fisheries operating in the area (Copello & Quintana 2009) and regularly include discards in their diet (Copello & Quintana 2003, Copello et al 2008. Although Magellanic penguins and imperial cormorants have been recorded taking advantage of discards at this and other fisheries operating at Golfo San Jorge, they do so in relatively low frequencies and/or numbers (Yorio & Caille 1999, González-Zevallos & Yorio 2006; thus, it is unlikely that their populations benefit much from this supplementary food source.…”

Section: Discussionmentioning

confidence: 99%

Seabird attendance and incidental mortality at shrimp fisheries in Golfo San Jorge, Argentina

González-Zevallos¹,

Yorio²,

Svagelj³

2011

Mar. Ecol. Prog. Ser.

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Many seabirds are attracted to trawl vessels to make use of fishery waste, and often this attraction results in increased incidental mortality. We assessed seabird attendance and associated incidental mortality at the Argentine red shrimp Pleoticus muelleri trawl fishery in Golfo San Jorge, Argentina. Information on seabird numbers was gathered in the autumn and winter 2006 and spring 2008, while information on seabird incidental captures was obtained for the period [2005][2006][2007]. Eighteen seabird species attended vessels, and the 2 most frequent and abundant seabirds (percent occurrence, median no. haul -1 ) were the kelp gull Larus dominicanus (> 94%, <100) and blackbrowed albatross Thalassarche melanophrys (> 94%, < 55). Seabird numbers were significantly lower in winter than the other 2 seasons and highest during discarding activities. Species incidentally killed in nets were the Magellanic penguin Spheniscus magellanicus and imperial cormorant Phalacrocorax atriceps, with a mean capture rate of 0.048 birds haul -1 , and for both species, mortality decreased with distance to the coast. Considering the fishery's fishing effort during each month, the estimated total mortality in the study period was 895 (95% CI: 572 to 1339) penguins and 172 (95% CI: 69 to 305) cormorants. Over 95% of the recorded mortality occurred in 2005, the year when the trawling moratorium generally implemented in the area was not enforced. No interactions with warp cables were recorded. Results highlight the relevance of complying with the current moratorium scheme, as adjusting it to the penguin and cormorant breeding seasons may by a potentially effective management tool. The proximity to the coast of the recorded incidental mortalities indicates the need to reevaluate the spatial design of the park and/or the definition of management actions beyond the boundaries of the Marine Protected Area. KEY WORDS: Seabird -fishery interactions · Seabird by-catch · Trawlers · Fishing discards · PatagoniaResale or republication not permitted without written consent of the publisher Mar Ecol Prog Ser 432: 125-135, 2011 tant cause of mortalities and serious injuries for seabirds (Sullivan et al. 2006, González-Zevallos et al. 2007, Watkins et al. 2008, Favero et al. 2011.The commercial fishery targeting the Argentine red shrimp Pleoticus muelleri in Patagonia, Argentina, is one of the country's most important fisheries in terms of economic return (Subsecretaría de Pesca y Acuicultura 2007) and generates large amounts of fishing wastes. Total biomass discarded per year of just Argentine hake Merluccius hubbsi, a demersal species that is not normally available to seabirds that surfacefeed, was estimated between 17 200 and 46 500 t (Cordo 2005). Preliminary information indicates that several seabirds, including the Endangered blackbrowed albatross Thalassarche melanophrys, the Vulnerable white-chinned petrel Procellaria aequinoctialis, and the Near Threatened sooty shearwater Puffinus griseus and Magellanic penguin Spheniscus mage...

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Foraging behavior and habitat use by the Southern Giant Petrel on the Patagonian Shelf

2009

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Spatio-temporal overlap between the at-sea distribution of Southern Giant Petrels and fisheries at the Patagonian Shelf

Cited by 36 publications

References 37 publications

At-sea distribution and diet of an endangered top predator: relationship between white-chinned petrels and commercial longline fisheries

At-sea distribution and diet of an endangered top predator: relationship between white-chinned petrels and commercial longline fisheries

Seabird attendance and incidental mortality at shrimp fisheries in Golfo San Jorge, Argentina

Foraging behavior and habitat use by the Southern Giant Petrel on the Patagonian Shelf

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