Prey consumption of Australasian gannets (Morus serrator) breeding in Port Phillip Bay, southeast Australia, and potential overlap with commercial fisheries

Bunce, Ashley

doi:10.1006/jmsc.2001.1083

Cited by 44 publications

(50 citation statements)

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“…Steiger et al, 2009). As a result, the amount of data recorded while the animals were inactive constituted 97% of the calibration data recorded, which is clearly unrepresentative of the behaviour of freeranging Australasian gannets, which spend over 40% of their time engaged in foraging activity (Bunce, 2001). To account for this, we could have selected data from the inactive set to combine with data while the birds were active on the treadmill.…”

Section: Laboratory Data Analysismentioning

confidence: 99%

“…As in the present study, changes in MMR were closely associated with changes in FMR (White et al, 2011). The present study shows that changes in MMR are important for understanding what governs seasonal changes in FMR, which may in turn be important for understanding seasonal variation in prey requirements (Bunce, 2001). A previous study of macaroni penguins showed that an increase in diving capacity could be explained by a seasonal reduction in MMR during winter (Green et al, 2005a).…”

Section: Seasonal Change In Mmrmentioning

confidence: 99%

“…As with other gannets, Australasian gannets are unusual among seabirds in that the two parents continue to alternate in brooding/guarding and provisioning duties until the chick fledges, and the chick is never left unguarded. This allows us to account to some extent for the potentially confounding effect of behaviour, as previous studies suggest that the time budget of Australasian gannets does not change between incubation and chick rearing (Bunce, 2001). We set out to determine whether the FMR of Australasian gannets changes during the breeding season and, if it does, whether this change is due to variation in time budget, maintenance metabolism or the metabolic cost of activity.…”

Section: Introductionmentioning

confidence: 99%

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An increase in minimum metabolic rate and not activity explains field metabolic rate changes in a breeding seabird

Green

Aitken-Simpson

White

et al. 2013

Journal of Experimental Biology

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SUMMARYThe field metabolic rate (FMR) of a free-ranging animal can be considered as the sum of its maintenance costs (minimum metabolic rate, MMR) and additional costs associated with thermoregulation, digestion, production and activity. However, the relationships between FMR and BMR and how they relate to behaviour and extrinsic influences is not clear. In seabirds, FMR has been shown to increase during the breeding season. This is presumed to be the result of an increase in foraging activity, stimulated by increased food demands from growing chicks, but few studies have investigated in detail the factors that underlie these increases. We studied free-ranging Australasian gannets (Morus serrator) throughout their 5month breeding season, and evaluated FMR, MMR and activity-related metabolic costs on a daily basis using the heart rate method. In addition, we simultaneously recorded behaviour (flying and diving) in the same individuals. FMR increased steadily throughout the breeding season, increasing by 11% from the incubation period to the long chick-brooding period. However, this was not accompanied by either an increase in flying or diving behaviour, or an increase in the energetic costs of activity. Instead, the changes in FMR could be explained exclusively by a progressive increase in MMR. Seasonal changes in MMR could be due to a change in body composition or a decrease in body condition associated with changing the allocation of resources between provisioning adults and growing chicks. Our study highlights the importance of measuring physiological parameters continuously in free-ranging animals in order to understand fully the mechanisms underpinning seasonal changes in physiology and behaviour.

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Section: Laboratory Data Analysismentioning

confidence: 99%

Section: Seasonal Change In Mmrmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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An increase in minimum metabolic rate and not activity explains field metabolic rate changes in a breeding seabird

Green

Aitken-Simpson

White

et al. 2013

Journal of Experimental Biology

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“…Croll & Tershy 1998, Green et al 1998, Bunce 2001, Goldsworthy et al 2001, Furness 2002. Indeed, fisheries and foraging seabirds inevitably interact in a number of ways (review by Montevecchi 2002).…”

Section: Resource Overlap Between Fisheries and Seabirdsmentioning

confidence: 99%

“…These studies have focused on only one (e.g. Lorentsen et al 1998, Rodhouse et al 1998, Bunce 2001) or a few seabird species breeding at one location (e.g. Croll & Tershy 1998, Green et al 1998, Goldsworthy et al 2001, Barrett et al 2002.…”

Section: Introductionmentioning

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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Prey caloric value and predator energy needs: foraging predictions for wild spinner dolphins

Benoit‐Bird¹

2004

Marine Biology

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Prey consumption of Australasian gannets (Morus serrator) breeding in Port Phillip Bay, southeast Australia, and potential overlap with commercial fisheries

Cited by 44 publications

References 42 publications

An increase in minimum metabolic rate and not activity explains field metabolic rate changes in a breeding seabird

An increase in minimum metabolic rate and not activity explains field metabolic rate changes in a breeding seabird

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

Prey caloric value and predator energy needs: foraging predictions for wild spinner dolphins

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