Effects of age, sex, colony and breeding phase on marine space use by Great Shearwaters Ardenna gravis in the South Atlantic

Ronconi, Robert A.; Schoombie, Stefan; Westgate, Andrew J.; Wong, Sarah N. P.; Koopman, Heather N.; Ryan, Peter G.

doi:10.1007/s00227-018-3299-x

Cited by 18 publications

(22 citation statements)

References 58 publications

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“…Distribution patterns documented in this study are consistent with nonbreeding distributions measured during ship and aerial at-sea surveys in the California Current (Briggs et al 1987, Mason et al 2007, Adams et al 2014, which report similar aggregations regionally and with respect to bathymetry. Furthermore, the overall mean tracking duration among individual pink-footed shearwaters herein (135 ± 55 d) is similar to the mean durations reported using the same attachment technique applied to spectacled petrels Procellaria conspicillata (130 ± 53 d; Reid et al 2014), sooty shearwaters (108 ± 26 d;Adams et al 2012), and greater shearwaters Puffinus gravis (159 ± 70 d; Ronconi et al 2018). In this study, we observed normal behavior and/or tag voltage drops when tag transmissions ceased.…”

Section: Discussionsupporting

confidence: 78%

Eastern Pacific migration strategies of pink-footed shearwaters Ardenna creatopus: implications for fisheries interactions and international conservation

Felis¹,

Adams²,

Hodum³

et al. 2019

Endang. Species. Res.

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The pink-footed shearwater Ardenna creatopus has a breeding range restricted to 3 central-Chilean islands and travels north in the eastern Pacific Ocean during the non-breeding period. Despite its Vulnerable IUCN status, the locations and relative importance of core nonbreeding areas and migratory pathways of the species are not well understood. During 5 years between 2006 and 2015, we tracked the movements of 42 after-hatch-year pink-footed shearwaters in the non-breeding season using satellite tags. Tracked shearwaters exhibited 2 postbreeding-season migration strategies: 28% of individuals traveled 1600−2500 km north from their colonies to spend the entire non-breeding season off Peru, and 72% traveled 8000−11000 km north to waters off western North America (Baja California, Mexico, to southernmost Canada). Individuals that traveled to North America stopped in Peruvian waters on each leg of the migration, making this a migratory bottleneck. Core non-breeding-season areas included continental shelf and slope waters off Trujillo to Lima (Peru), central Baja California (Mexico), southern to central California (USA), and central Oregon (USA) to southern Vancouver Island (Canada). Of 12 national exclusive economic zones (EEZs) encountered north of their breeding range, birds primarily utilized the USA, Peru and Mexico, and to a lesser degree Chile, Canada, and Ecuador. Bycatch in fisheries was recently identified as a significant at-sea threat to pink-footed shearwaters, and we found evidence of pink-footed shearwater bycatch in 6 EEZs encountered by tracked birds, although quantification of bycatch magnitude is variable and not all fisheries have been studied.

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Section: Discussionsupporting

confidence: 78%

Eastern Pacific migration strategies of pink-footed shearwaters Ardenna creatopus: implications for fisheries interactions and international conservation

Felis¹,

Adams²,

Hodum³

et al. 2019

Endang. Species. Res.

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“…In the Atlantic, those in oceanic waters will overlap with the southern portion of at-sea distributions of the huge seabird populations from the South Atlantic Islands. This overlap is greater during the nonbreeding season than the breeding season (Reid et al, 2013;Dias et al, 2017;Ronconi et al, 2018;Jones et al, 2020). Those Antarctic populations that move to a greater or lesser extent close to or onto the Patagonian Shelf or into the Humboldt Current will overlap with huge local breeding populations of seabirds and many long-distance migrants from areas such as New Zealand or the Northern Hemisphere (Spear et al, 2003;Landers et al, 2011;Baylis et al, 2019;Ponchon et al, 2019).…”

Section: Seasonal Changes In Prey Demand Of Seabirdsmentioning

confidence: 99%

Global Connectivity of Southern Ocean Ecosystems

et al. 2021

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Southern Ocean ecosystems are globally important. Processes in the Antarctic atmosphere, cryosphere, and the Southern Ocean directly influence global atmospheric and oceanic systems. Southern Ocean biogeochemistry has also been shown to have global importance. In contrast, ocean ecological processes are often seen as largely separate from the rest of the global system. In this paper, we consider the degree of ecological connectivity at different trophic levels, linking Southern Ocean ecosystems with the global ocean, and their importance not only for the regional ecosystem but also the wider Earth system. We also consider the human system connections, including the role of Southern Ocean ecosystems in supporting society, culture, and economy in many nations, influencing public and political views and hence policy. Rather than Southern Ocean ecosystems being defined by barriers at particular oceanic fronts, ecological changes are gradual due to cross-front exchanges involving oceanographic processes and organism movement. Millions of seabirds and hundreds of thousands of cetaceans move north out of polar waters in the austral autumn interacting in food webs across the Southern Hemisphere, and a few species cross the equator. A number of species migrate into the east and west ocean-basin boundary current and continental shelf regions of the major southern continents. Human travel in and out of the Southern Ocean region includes fisheries, tourism, and scientific vessels in all ocean sectors. These operations arise from many nations, particularly in the Northern Hemisphere, and are important in local communities as well as national economic, scientific, and political activities. As a result of the extensive connectivity, future changes in Southern Ocean ecosystems will have consequences throughout the Earth system, affecting ecosystem services with socio-economic impacts throughout the world. The high level of connectivity also means that changes and policy decisions in marine ecosystems outside the Southern Ocean have consequences for ecosystems south of the Antarctic Polar Front. Knowledge of Southern Ocean ecosystems and their global connectivity is critical for interpreting current change, projecting future change impacts, and identifying integrated strategies for conserving and managing both the Southern Ocean and the broader Earth system.

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“…The marine predators breeding on the islands of Tristan da Cunha disperse widely across the South Atlantic Ocean and the entire EEZ of Tristan da Cunha is one of the most important marine areas in the South Atlantic Ocean for these species (Dias et al, 2017;Ronconi et al, 2018;Schoombie et al, 2017). Our analysis highlights that these mobile marine predators are not uniformly distributed throughout the EEZ.…”

Section: Discussionmentioning

confidence: 79%

Marine hotspots of activity inform protection of a threatened community of pelagic species in a large oceanic jurisdiction in the South Atlantic

Requena-Moreno¹,

Oppel²,

Bond³

et al. 2019

Preprint

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Remote oceanic islands harbour unique biodiversity, especially of species that rely on pelagic resources around their breeding islands. Identifying marine areas used by such species is important to reduce or limit threats that may put these species at risk. The Tristan da Cunha group of islands in the South Atlantic Ocean hosts several endemic and globally threatened seabirds and pinnipeds; how they use the waters surrounding the islands must be considered when planning industrial activities in the entire Exclusive Economic Zone (EEZ). We identified hotspots of activity by collating animal tracking data from nine breeding seabirds and one marine mammal to inform marine management in the Tristan da Cunha EEZ.To detect statistically significant areas of concentrated activity, we calculated the time-spent-in-area that tracked individuals (breeding adults) of 10 focal species (mainly breeding adults of nine seabirds and adult female Subantarctic fur seals Arctocephalus tropicalis) invested in a grid of regular 10 × 10 km cells within the EEZ, for each of four seasons to account for temporal variability in space use. Applying a spatial aggregation statistic over these grids by each species we detected areas that are used more than expected by chance. Most of the activity hotspots were either within 100 km of the islands or were associated with seamounts being spatially constant across several seasons. Moreover, some species spend a large proportion of their time-at-sea inside the EEZ during certain breeding stages, rendering the sites we identified critical for their fitness. Our approach provides a simple and effective tool to highlight important areas for pelagic biodiversity that will benefit Tristan da Cunha’s conservation planning and marine management strategies.

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Effects of age, sex, colony and breeding phase on marine space use by Great Shearwaters Ardenna gravis in the South Atlantic

Cited by 18 publications

References 58 publications

Eastern Pacific migration strategies of pink-footed shearwaters Ardenna creatopus: implications for fisheries interactions and international conservation

Eastern Pacific migration strategies of pink-footed shearwaters Ardenna creatopus: implications for fisheries interactions and international conservation

Global Connectivity of Southern Ocean Ecosystems

Marine hotspots of activity inform protection of a threatened community of pelagic species in a large oceanic jurisdiction in the South Atlantic

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