Changes in distribution, relative abundance, and species composition of large whales around South Georgia from opportunistic sightings: 1992 to 2011

Richardson, Jessica; Wood, Andrew G.; Neil, Alison; Nowacek, Doug; Moore, Michael J.

doi:10.3354/esr00471

Cited by 28 publications

(30 citation statements)

References 23 publications

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“…N on-effort-based opportunistic and public sightings data have proved useful in other recent studies investigating broad-scale distributions of migratory marine megavertebrates, such as the basking shark Cetorhinus maximus (Witt et al 2012) and large whale species (Richardson et al 2012). We suggest that scarce or endangered species with a high public profile and an inshore distribution are most suitable for co-ordinated 'citizen science' marine vertebrate recording projects.…”

Section: Discussionmentioning

confidence: 99%

Using integrated land- and boat-based surveys to inform conservation of the Critically Endangered Balearic shearwater

Jones¹,

Wynn²,

Yésou³

et al. 2014

Endang. Species. Res.

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We investigated spatio-temporal distribution patterns of the Critically Endangered Balearic shearwater Puffinus mauretanicus in the northern part of its migratory range, using a combination of effort-corrected land-and boat-based survey data (2007−2010). The species was recorded regularly along the western English Channel (Western Channel) coasts of northwest France and the southwest UK, with peak counts occurring during the summer and autumn months. Foraging aggregations comprising hundreds to thousands of birds (~1 to 20% of the global population) were recorded in the large shallow embayments of northern Brittany in all survey years. Elsewhere, most birds were recorded on passage, with maximum birds-per-hour (BPH) of 169 off northwest France and 36 off the southwest UK. Few birds were recorded offshore, beyond sight of land. A distance-from-shore analysis revealed that the species passed closer to shore than other pelagic seabirds such as sooty shearwater Puffinus griseus. A constant-effort seasonal survey from the southwest tip of the UK mainland recorded the species on 93% of survey days, with BPH rates peaking in the morning between 08:00 and 11:00 h. These results have important monitoring and conservation implications for this Critically Endangered species. In particular, the records of large aggregations in spatially restricted areas of the Western Channel during the inter-breeding period suggests the species could be vulnerable to impacts such as oil spills, or disturbance from offshore construction projects. We also provide evidence that some birds remain in the survey area during the breeding season, suggesting it may be an important site for non-breeding birds.

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Section: Discussionmentioning

confidence: 99%

Using integrated land- and boat-based surveys to inform conservation of the Critically Endangered Balearic shearwater

Jones¹,

Wynn²,

Yésou³

et al. 2014

Endang. Species. Res.

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“…At a local level, the regional warming of South Georgia has already brought about changes to terrestrial and marine ecology, bird distribution Forcada & Trathan, 2009;Convey et al, 2011;Richardson et al, 2012;Morley et al, 2014; among many others), and seasonal snow cover and glacier extent (Gordon & Timmis, 1992;Gordon et al, 2008;Cook et al, 2010). Likewise, introduced flora and fauna (accidently and/or deliberately) has already profoundly damaged the natural ecosystem of the island (Frenot et al, 2005;SGHT, 2014).…”

Section: Species Reductionmentioning

confidence: 99%

Föhn winds on South Georgia and their impact on regional climate

Bannister

King

2015

Weather

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South Georgia is a small and mountainous island, located in the remote Southern Ocean. The island's subantarctic climate is controlled by its location and steep orography; with 19 peaks over 2000m and situated within a belt of strong westerly winds South Georgia acts as an effective barrier to the winds that impinge upon it.Since the 1920s, average summer temperatures have risen by ~1 o C on South Georgia.Coupled with this has been an increase in the rate of glacial retreat throughout the last century, with glaciers on the northeast leeside of the island retreating at a faster rate than those on the southwest side. These asymmetrical changes are thought to be linked with the strengthening of the westerlies. If the strength of the westerlies is sufficient, downslope winds can develop on the leeside of the island causing significant temperature increases as the descending air warms adiabatically; this is known as the föhn effect. Therefore, the aim of this thesis is to investigate whether the observed asymmetric pattern of regional warming and glacier retreat are caused by the föhn warming process.To explore the link between the föhn effect and its impact on the regional climate of

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“…Opportunistically collected 'presence-only' data from wildlife sightings databases and natural history collections are a valuable tool for monitoring species distribution and movement patterns (Kaschner et al 2006, Richardson et al 2012, Esteban et al 2014, especially when systematic surveys are not possible because of costs and/or logistical challenges. Sightings databases are also helpful in determining criti-cal habitat or hot spots, i.e.…”

Section: Introductionmentioning

confidence: 99%

Sightings of southern resident killer whales in the Salish Sea 1976-2014: the importance of a long-term opportunistic dataset

Olson¹,

Wood²,

Osborne³

et al. 2018

Endang. Species. Res.

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They are most abundant in nearshore temperate waters but also occur, at lower densities, in tropical, subtropical, and offshore waters (Mead & Brownell 2005, Ford 2014). Eastern North Pacific stocks of killer whales tend to be highly social animals that occur primarily in stable matriarchal social groups or pods that range in size from 2 to dozens of animals (Bigg et al. 1990, Parsons et al. 2009). Temporary groups as large as several hundred individuals, called superpods, form occasionally (Bigg et al. 1990, Parsons et al. 2009, Ford 2014). In the Northeast Pacific, 3 distinct ecotypes of killer whales are recognized: resident, tran

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Changes in distribution, relative abundance, and species composition of large whales around South Georgia from opportunistic sightings: 1992 to 2011

Cited by 28 publications

References 23 publications

Using integrated land- and boat-based surveys to inform conservation of the Critically Endangered Balearic shearwater

Using integrated land- and boat-based surveys to inform conservation of the Critically Endangered Balearic shearwater

Föhn winds on South Georgia and their impact on regional climate

Sightings of southern resident killer whales in the Salish Sea 1976-2014: the importance of a long-term opportunistic dataset

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