Parental Investments by Seabirds at the Breeding Area with Emphasis on Northern Gannets, Morus bassanus

Montevecchi, William A.; Porter, Julie

doi:10.1007/978-1-4684-2988-6_9

Cited by 31 publications

(20 citation statements)

References 71 publications

(69 reference statements)

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“…Gannets use the first portion of their foraging trips to feed themselves, before capturing food for their chicks and returning to the breeding site (Hamer et al 2000;RopertCoudert et al 2004). We found that females and males bring similar amounts of foods to chicks (in terms of mass), which contrasts with previous suggestions that female gannets are likely to be the main food supplier to the offspring (Montevecchi and Porter 1980;.…”

Section: Sex-specific Macronutrient Differencescontrasting

confidence: 83%

“…First, in marine prey species water content varies inversely proportional to lipid content among seasons and locations (Montevecchi and Piatt 1984). Our results suggest that males and females bring nutritionally imbalanced foods to the nest, but when combined allow the offspring to reach its multidimensional nutritional target of protein, lipid, water and micronutrients (Montevecchi and Porter 1980;Morehouse et al 2010). In this case, adults' nutritional needs are likely to influence foraging behaviour (diving, foraging trip durations and habitat use), such that different sexes will exploit vertical and horizontal habitats to capture certain foods that enable them to attain specific nutrients (Lewis et al 2002;Cleasby et al 2015).…”

Section: Sex-specific Macronutrient Differencesmentioning

confidence: 91%

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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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Section: Sex-specific Macronutrient Differencescontrasting

confidence: 83%

Section: Sex-specific Macronutrient Differencesmentioning

confidence: 91%

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

et al. 2016

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“…However, we cannot exclude the possibility that the devices caused the birds to forage less efficiently than normal. The equipment of the birds for 2 to 4 d represents only a very short part of the whole chick-rearing penod of about 13 wk (Nelson 1978, Montevecchi & Porter 1980. It is quite probable that fluctuating food availability leads to different success rates of all birds in the colony (Gremillet 1997).…”

Section: Activities and Foraging Efficiencymentioning

confidence: 99%

At-sea-activity and foraging efficiency in chick-rearing northern gannets Sula bassana:a case study in Shetland

Garthe¹,

Grémillet²,

Furness³

1999

Mar. Ecol. Prog. Ser.

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Chick-reanng northern gannets Sula bassana from Hermaness, Shetland (UK), were equipped with both stomach temperature loggers and external temperature loggers (attached to the leg). Detrirnental device effects on the birds could not be detected. Three complete data Sets covenng several foraging tnps by 3 birds showed that the logger-equipped birds spent 39 to 49% of their time in the colony. 22 to 30% flying and 22 to 34 % swimming. Foraging trips lasted between 2 h 45 min and 27 h 08 min. with a mean length of 13 h. Maximum foraging range was estimated to be 128 km. Dives lasted between 1 s and 7.5 s, with a mean of 4.4 s. Median food quantity swallowed per feeding event was 101 g (n = 32), with 745 g being the maximum. No foraging activity occurred at night. Catch per unit effort was assessed to range between 0.9 and 2.8 g fish min-' flying and between 0.5 and 1.3 g fish rnin-' at sea. Foraging efficiency vaned between 0.6 (negative energy budget) and 1.5 (positive energy budget). More data on foraging efficiency, preferably from different colonies and different years, could show how efficiently this top predator utilises food resources.

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“…T h e higher rates of courtship feeding by 2-egg males relative to 3-egg males during the post-laying period may reflect continued nutritional provisioning during the energetically demanding egg-laying period of females. In addition, males of several species of seabirds lose as much as, or more weight, prior to the incubation period, than do females (e.g., King Penguins Aptenodytes patagonica, Stonehouse 1960; Galapagos Penguins Spheniscus mendiculus, Boersma 1977; Northern Gannets MOYUS (Sula) bassanus, Montevecchi & Porter 1980). In many species of larids, courtship feeding by males allows the female to spend considerable amounts of time a t the nest site during the egg-formation stage.…”

Section: A W I G G I N S a N D R D M O R R I S I B I S 129mentioning

confidence: 99%

Parental care of the Common Tern Sterna hirundo

Wiggins

Morris

1987

Ibis

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Parental care activities of male and female Common Terns Sterna hivundo were recorded over two hreeding seasons. Males and females exhibited distinct parental roles throughout a breeding bout.(hurtship feeding by males was extensive prior to and during egg-laying, but declined with the onset of incubation. Females performed significantly more incubation behaviour than males although both sexes spent cqual time attending at the nest site. During the chick stage, females spent significantly more time on the territory than did males. Chick feeding was largely the responsibility of the male; males fed chicks at a rate approximately three times higher than that of females. In addition, whereas females showed no trend in the size of fish delivered to chicks relative to chick age, the size of fish delivered by males increased with chick age. Courtship feeding activities and extensive chick feeding contributi(ins by male Common Terns appear to outweigh parental ciintrihuticins b y fcmalcs, contrary to prcdictiiins fiir a monogamous species.

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Parental Investments by Seabirds at the Breeding Area with Emphasis on Northern Gannets, Morus bassanus

Cited by 31 publications

References 71 publications

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

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

At-sea-activity and foraging efficiency in chick-rearing northern gannets Sula bassana:a case study in Shetland

Parental care of the Common Tern Sterna hirundo

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