Foraging areas of Short-tailed Shearwaters during their northward migration along the Pacific coast of northern Japan

Ito, Shin

doi:10.2326/osj.1.159

Cited by 9 publications

(4 citation statements)

References 6 publications

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“…At the end of the breeding season they migrate to feed and winter in the waters of the North Pacific and the North Atlantic oceans (e.g. Guzman & Myres 1983, Camphuysen 1995, Gould et al 1997, 1998, Spear & Ainley 1999, Ito 2002 On occasion shearwaters form flocks and feed with surface-schooling tunas (Au & Pitman 1988, Au 1991. These seabirds benefit when tunas drive prey closer to the surface where they can be reached by surface divers.…”

Section: Methodsmentioning

confidence: 99%

Modelling and mapping resource overlap between seabirds and fisheries on a global scale: a preliminary assessment

Karpouzi¹,

Watson²,

Pauly³

2007

Mar. Ecol. Prog. Ser.

110

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Coexistence of foraging seabirds and operating fisheries may result in interactions such as competition for the same prey resources. We used GIS-based modelling at a scale of 0.5 × 0.5°spa-tial cells to: (1) map the foraging distribution of seabirds; (2) predict their annual food consumption rates in a spatially explicit manner; and (3) estimate a spatially explicit seabird -fisheries overlap index. Information on population size, diet composition and foraging attributes of 351 seabird species was compiled into a Microsoft Access database. Global annual food consumption by seabirds was estimated to be 96.4 million tonnes (95% CI: 78.0 to 114.7 million tonnes), compared with a total catch of nearly 120 million tonnes by all marine fisheries. Krill and cephalopods comprised over 58% of the overall food consumed and fish most of the remainder. The families Procellariidae (albatrosses, petrels, shearwaters) and Spheniscidae (penguins) were responsible for over 54% of the overall food consumption. Seabird foraging distribution maps revealed that areas around New Zealand, the eastern Australian coast, and the sub-Antarctic islands had high species richness. However, temperate and polar regions supported high seabird densities and most food extracted by seabirds originated there. Furthermore, maps of food consumption rates revealed that most food consumed by seabirds was extracted from offshore rather than nearshore waters and from areas where seabird -fisheries overlap was low. The resource overlap maps identified 'hotspots' of highest potential for conflict between fisheries and seabirds. Thus, this study may provide useful insight when developing management approaches for designing offshore marine conservation areas. KEY WORDS: Seabird -fisheries interactions · Resource overlap · Foraging distribution · Seabird food consumptionResale or republication not permitted without written consent of the publisher

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Section: Methodsmentioning

confidence: 99%

Modelling and mapping resource overlap between seabirds and fisheries on a global scale: a preliminary assessment

Karpouzi¹,

Watson²,

Pauly³

2007

Mar. Ecol. Prog. Ser.

110

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“…Short-tailed shearwaters feed mainly on euphausiids (Ogi et al 1980), and sooty shearwaters predominantly feed on pelagic fish, such as Japanese sardine and Pacific saury (Shiomi & Ogi 1992). In spring, short-tailed shearwaters migrate north to northern Oyashio areas; sooty shearwaters also migrate northwards, congregating over waters of 9 to 13°C (Ogi 1984, Shiomi & Ogi 1992, Ito 2002. These northward migrations have also been considered to coincide with the distribution and availability of prey (Shiomi & Ogi 1992, Warham 1996, Ito 2002).…”

Section: Seasonal Changes In Foraging Areamentioning

confidence: 99%

“…In spring, short-tailed shearwaters migrate north to northern Oyashio areas; sooty shearwaters also migrate northwards, congregating over waters of 9 to 13°C (Ogi 1984, Shiomi & Ogi 1992, Ito 2002. These northward migrations have also been considered to coincide with the distribution and availability of prey (Shiomi & Ogi 1992, Warham 1996, Ito 2002). …”

Section: Seasonal Changes In Foraging Areamentioning

confidence: 99%

Foraging areas of streaked shearwaters in relation to seasonal changes in the marine environment of the Northwestern Pacific: inter-colony and sex-related differences

Yamamoto

Takahashi²,

Oka³

et al. 2011

Mar. Ecol. Prog. Ser.

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As the spatial distribution of marine organisms is often affected by seasonal changes, pelagic seabirds may change their foraging areas in response to seasonal changes in the marine environment. Here, we examined the foraging area of streaked shearwaters Calonectris leucomelas, breeding at Sangan (SA) and Mikura Islands (MK), Japan, from spring to summer during pre-laying and incubation periods. Those colonies are located at the north and south of the Northwestern Pacific's Kuroshio-Oyashio transition area where high seasonal temperature changes are observed, and where, consequently, birds may show comparable responses to such changes. Our results showed that streaked shearwaters from both colonies shifted their foraging areas northwards as the season progressed. The seasonal shift of foraging areas appeared to coincide with the movement pattern of pelagic fishes that migrate northward in association with the increase in water temperature. However, the pattern of seasonal movement differed between the 2 colonies; shearwaters from SA moved their foraging area along the coastal area of the Kuroshio-Oyashio transition, while those from MK moved along the Kuroshio Extension. Our results also indicated sex-related differences in this general pattern: females showed clear seasonal changes in foraging area, while males did not. During the pre-laying period males returned to the colony frequently to defend their nests or mates, and spent less time at sea. Our results suggest that streaked shearwaters changed their foraging areas in response to seasonal changes in the marine environment, although colony location and sex-related differences in reproductive roles may constrain the birds' responses to seasonal change.

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“…Previously, Yamamoto et al (2011) examined the foraging areas of Streaked Shearwaters from spring to summer at these two different breeding colonies (Sangan and Mikura Islands, ;650 km apart) in the Northwestern Pacific and found colony, sex-related, and condition-dependent (breeding or nonbreeding) differences in their habitat use. Vessel survey observations of this species have been conducted in this region (Minami et al 2000, Ito 2002. However, previous studies were unable to distinguish the sex, colony of origin, and current breeding condition of observed birds.…”

Section: Introductionmentioning

confidence: 99%

Statistical integration of tracking and vessel survey data to incorporate life history differences in habitat models

Yamamoto

Watanuki

Hazen

et al. 2015

Ecological Applications

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Habitat use is often examined at a species or population level, but patterns likely differ within a species, as a function of the sex, breeding colony, and current breeding status of individuals. Hence, within-species differences should be considered in habitat models when analyzing and predicting species distributions, such as predicted responses to expected climate change scenarios. Also, species' distribution data obtained by different methods (vessel-survey and individual tracking) are often analyzed separately rather than integrated to improve predictions. Here, we eventually fit generalized additive models for Streaked Shearwaters Calonectris leuconelas using tracking data from two different breeding colonies in the Northwestern Pacific and visual observer data collected during a research cruise off the coast of western Japan. The tracking-based models showed differences among patterns of relative density distribution as a function of life history category (colony, sex, and breeding conditions). The integrated tracking-based and vessel-based bird count model incorporated ecological states rather than predicting a single surface for the entire species. This study highlights both the importance of including ecological and life history data and integrating multiple data types (tag-based tracking and vessel count) when examining species-environment relationships, ultimately advancing the capabilities of species distribution models.

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Foraging areas of Short-tailed Shearwaters during their northward migration along the Pacific coast of northern Japan

Cited by 9 publications

References 6 publications

Modelling and mapping resource overlap between seabirds and fisheries on a global scale: a preliminary assessment

Modelling and mapping resource overlap between seabirds and fisheries on a global scale: a preliminary assessment

Foraging areas of streaked shearwaters in relation to seasonal changes in the marine environment of the Northwestern Pacific: inter-colony and sex-related differences

Statistical integration of tracking and vessel survey data to incorporate life history differences in habitat models

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