Seabird Interactions with Coastal Fisheries in Northern Patagonia: Use of Discards and Incidental Captures in Nets

Yorio, Pablo; Caille, Guillermo

doi:10.2307/1522209

Cited by 52 publications

(50 citation statements)

References 18 publications

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“…Apart from the immediate competition between penguins and fisheries, small numbers of penguins and other top predators may become caught accidentally in the net during fishing operations (e.g. Yorio & Caille 1999, Gandini et al 1999. Oil pollution frequently occurs north of this area, killing 40 000 Magellanic penguins Spheniscus magellanicus each year along the coast of the Argentine province of Chubut, a coastline of approximately 3000 km to the north of Puerto Deseado (Gandini et al 1994); breeding pair numbers at some Magellanic penguin colonies have fallen recently (Williams 1995).…”

Section: Puerto Deseado Areamentioning

confidence: 99%

Winter dispersal of rockhopper penguins Eudyptes chrysocome from the Falkland Islands and its implications for conservation

Pütz¹,

Ingham²,

Smith³

et al. 2002

Mar. Ecol. Prog. Ser.

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In 3 successive years (1998 to 2000), the winter migration of rockhopper penguins Eudyptes chrysocome from 3 separate breeding colonies on the Falkland Islands was monitored using satellite transmitters. After their moult, 34 penguins were followed for a mean transmission period of 81 ± 21 d. While there were substantial spatial and temporal variations in migration patterns, we identified several foraging areas where food availability is presumably higher than elsewhere.

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Section: Puerto Deseado Areamentioning

confidence: 99%

Winter dispersal of rockhopper penguins Eudyptes chrysocome from the Falkland Islands and its implications for conservation

Pütz¹,

Ingham²,

Smith³

et al. 2002

Mar. Ecol. Prog. Ser.

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“…The use of fishing waste may increase breeding success, affect community composition and induce changes in the distribution of birds at sea (Wahl & Heinemann 1979, Ryan & Moloney 1988, Hudson & Furness 1989, Oro et al 1995. Seabird use of fishery waste has been described in several regions, including the North Sea (Furness et al 1992, Garthe & Hüppop 1994, Mediterranean Sea (Oro & Ruiz 1997), NW Atlantic (Chapde-laine & Rail 1997), Pacific Ocean (Jones & DeGange 1988), Australia and New Zealand (Blaber & Wassenberg 1989, Petyt 1995, South Africa (Ryan & Moloney 1988) and the SW Atlantic (Thompson & Riddy 1995, Yorio & Caille 1999, Bertellotti & Yorio 2000.…”

Section: Introductionmentioning

confidence: 99%

“…Knowledge of seabird -fishery interactions on the Argentine continental shelf is still relatively poor. Discard use by seabirds has been quantitatively analysed only in coastal fisheries (Yorio & Caille 1999, Bertellotti & Yorio 2000. Seabird use of fishery waste provided by high-sea trawl fisheries, however, has not yet been analysed, although these fishing fleets have a greater potential of affecting seabird populations due to the larger number of vessels and higher discarding rates.…”

Section: Introductionmentioning

confidence: 99%

Seabird use of discards and incidental captures at the Argentine hake trawl fishery in the Golfo San Jorge, Argentina

González-Zevallos¹,

Yorio²

2006

Mar. Ecol. Prog. Ser.

106

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We studied discard use and incidental mortality of seabirds attracted to high-sea trawl vessels operating in the Golfo San Jorge, Argentina, during the height of the fishing season in 2003 and 2004. Fourteen seabird species ate food made available by fishing operations. The most frequent and abundant seabirds (percent occurrence, mean number per haul) were the kelp gull Larus dominicanus (98.9%, 207.0), the black-browed albatross Thalassarche melanophrys (98.9%, 94.2) and the white-chinned petrel Procellaria aequinoctialis (91%, 8.4). Flock sizes for the 3 species varied from a few to a maximum of 1600 birds. Total seabird abundance varied significantly between stages of the fishing operation, being higher during discarding and haulback than during towing. Incidental capture of seabirds in nets was recorded in 37% of 89 hauls, with a mean capture rate of 1.2 birds per haul. Species incidentally caught were the great shearwater Puffinus gravis, the imperial cormorant Phalacrocorax atriceps and the Magellanic penguin Spheniscus magellanicus, with rates that varied between months and years. Considering the fishery's fishing effort, the estimated total numbers of birds killed during the study were 2254 great shearwaters (CV = 1.1), 1233 imperial cormorants (CV = 1.1) and 35 Magellanic penguins (CV = 2.4) in 2003, and 311 imperial cormorants (CV = 1.7) and 1516 Magellanic penguins (CV = 1.1) in 2004. Black-browed albatrosses and kelp gulls were also struck by the warp cable while feeding on discards from the surface, and drowned when they were dragged underwater. The results obtained in this study show that the hake trawl fishery operating in the Golfo San Jorge may have a significant effect on some seabird populations through the provision of fishing discards and incidental mortality.

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“…The combined estimates for (adult-plumaged) albatross mortality along the Patagonian shelf and shelf break maybe of the order of ca. 5,000 individuals per year (from Neves and Olmos 1997;Yorio and Caille 1999;Olmos et al 2000;Favero et al 2003;Reid et al 2004;Reid and Edwards 2005;Crofts 2006;Gandini and Frere 2006;González-Zevallos and Yorio 2006;Laich et al 2006;Moreno et al 2006;Sullivan et al 2006b;González-Zevallos et al 2007;Otley et al 2007;Bugoni et al 2008;Moreno et al 2008;Sancho 2009;Jiménez et al 2009Jiménez et al , 2010Favero et al 2010). Even if we assume that the true mortality is twice as high as the above estimate (which is not unreasonable) and is entirely of birds from the local population, fisheries-related mortality would affect less than 1% of the birds from the Falklands.…”

Section: Discussionmentioning

confidence: 99%

Demographic parameters of black-browed albatrosses Thalassarche melanophris from the Falkland Islands

2011

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Black-browed albatrosses Thalassarche melanophris are currently classified as globally endangered. The most important populations of this species are believed to be declining due to, amongst other factors, unsustainable levels of incidental mortality in fishing gear. However, detailed demographic data are lacking for several critical populations, including the largest of all, nesting in the Falkland Islands. Here, we present data from the first Falkland Islands detailed demographic study (at New Island) and show that, from 2003 to 2009, the mean adult survival probability was 0.942 (95% CI: 0.930-0.952). Nesting frequency of adults is amongst the highest recorded for Thalassarche albatrosses and breeding success (0.564 chicks per egg) is within normal values. The nesting population in the intensively studied plots experienced an increase of 4% per year from 2004 to 2009. These results indicate that the Falklands population may not be as threatened as previously supposed, although studies from more sites and a longer time series are needed to confirm or refute this. The high survival rates may partly reflect recent efforts to mitigate bycatch made by the Falkland Islands and other fisheries in the region. The reinforcement of such initiatives may be critical to buffer the black-browed albatross population against ecosystem shifts and natural disasters (such as harmful algal blooms) that will likely become more frequent with ongoing global changes.

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Seabird Interactions with Coastal Fisheries in Northern Patagonia: Use of Discards and Incidental Captures in Nets

Cited by 52 publications

References 18 publications

Winter dispersal of rockhopper penguins Eudyptes chrysocome from the Falkland Islands and its implications for conservation

Winter dispersal of rockhopper penguins Eudyptes chrysocome from the Falkland Islands and its implications for conservation

Seabird use of discards and incidental captures at the Argentine hake trawl fishery in the Golfo San Jorge, Argentina

Demographic parameters of black-browed albatrosses Thalassarche melanophris from the Falkland Islands

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