Using non-systematic surveys to investigate effects of regional climate variability on Australasian gannets in the Hauraki Gulf, New Zealand

Srinivasan, Mridula; Dassis, Mariela; Benn, Emily C.; Stockin, Karen A.; Martínez, Emmanuelle; Machovsky‐Capuska, Gabriel E.

doi:10.1016/j.seares.2015.02.004

Cited by 4 publications

(1 citation statement)

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“…The Australasian gannet (Morus serrator) is an important marine predator in southeastern Australia and New Zealand [38,39], with an estimated annual consumption of 228.2 tons of schooling pelagic fish (e.g. Australian sardine Sardinops sagax, barracouta Thyrsites atun and blue mackerel Scomber australasicus) in Australian waters alone [40].…”

Section: Introductionmentioning

confidence: 99%

Geographical, temporal and individual factors influencing foraging behaviour and consistency in Australasian gannets

et al. 2020

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Foraging is a behaviour that can be influenced by multiple factors and is highly plastic. Recent studies have shown consistency in individual foraging behaviour has serious ecological and evolutionary implications within species and populations. Such information is crucial to understand how species select habitats, and how such selection might allow them to adapt to the environmental changes they face. Five foraging metrics (maximum distance from the colony, bearing from the colony to the most distal point, tortuosity index, total number of dives and mean vectorial dynamic body acceleration were obtained using GPS tracking and accelerometry data in adult Australasian gannets ( Morus serrator ) from two colonies in southeastern Australia. Individuals were instrumented over two breeding seasons to obtain data to assess factors influencing foraging behaviour and behavioural consistency over multiple timescales (consecutive trips, breeding stages and years) and habitats (pelagic, mixed pelagic and inshore, and inshore). Colony, breeding stage and year were the factors which had the greatest influence on foraging behaviour, followed by sex. Behavioural consistency, measured as the contribution of the individual to the observed variance, was low to moderate for all foraging metrics (0.0–27.05%), with the higher values occurring over shorter timescales. In addition, behavioural consistency was driven by spatio-temporal factors rather than intrinsic characteristics. Behavioural consistency was higher in individuals foraging in inshore than pelagic habitats or mixed pelagic/inshore strategy, supporting suggestions that consistency is favoured in stable environments.

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Section: Introductionmentioning

confidence: 99%

Geographical, temporal and individual factors influencing foraging behaviour and consistency in Australasian gannets

et al. 2020

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Sex-specific macronutrient foraging strategies in a highly successful marine predator: the Australasian gannet

et al. 2016

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Farewell Spit gannetry in New Zealand. Our results showed intra-and inter-specific variation in the protein, lipid and water composition of prey captured by our sample of 111 Australasian gannets. In addition, we observed significant differences in the Australasian gannets' nutritional niche between seasons. We provide evidence of sex-specific macronutrient foraging strategies in a successful marine predator in the wild. We have shown that in spite of fluctuations in the nutritional composition of foods available to Australasian gannets, males consistently capture prey with higher protein-to-lipid ratios and lower lipid-to-water ratios than females. These results aid to better understand the evolutionary relationship between macronutrient selection and sex-specific traits in wild animals. They also suggest an incentive for these predators to combine individually imbalanced but nutritionally complementary foods to achieve dietary balance, further highlighting the likelihood that prey selection is guided by the balance of macronutrients, rather than energy alone.

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Erratum to: Sex-specific macronutrient foraging strategies in a highly successful marine predator: the Australasian gannet

et al. 2016

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Using non-systematic surveys to investigate effects of regional climate variability on Australasian gannets in the Hauraki Gulf, New Zealand

Cited by 4 publications

References 46 publications

Geographical, temporal and individual factors influencing foraging behaviour and consistency in Australasian gannets

Geographical, temporal and individual factors influencing foraging behaviour and consistency in Australasian gannets

Sex-specific macronutrient foraging strategies in a highly successful marine predator: the Australasian gannet

Erratum to: Sex-specific macronutrient foraging strategies in a highly successful marine predator: the Australasian gannet

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