The importance of lipid-rich fish prey for Cape gannet chick growth: are fishery discards an alternative?

Mullers, Ralf H. E.; Navarro, R. A.; Crawford, Robert J. M.; Underhill, Les G.

doi:10.1093/icesjms/fsp210

Cited by 36 publications

(43 citation statements)

References 33 publications

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“…Bal-ancing resource allocation between reproductions is particularly important for long-lived animals (Williams 1966), such as seabirds, because excessive effort allocation in a current reproduction can strongly affect adult survival (Stearns 1992). Seabirds adopt different foraging strategies to cope with changes in prey availability in the vicinity of their colonies by shifting to less preferred prey (Bryant et al 1999, Mullers et al 2009), increasing foraging range and time at sea (Suryan et al 2000, Boersma & Rebstock 2009), or alternating short and long trips to balance the energy requirements of chicks and adults (Saraux et al 2011). Such changes in the allocation of foraging effort (energy and time) and diet quality (Kitaysky et al 2006, Romano et al 2006) appear to be sometimes costly for both offspring (Golet et al 2000) and adults (Oro & Furness 2002, Harding et al 2011.…”

Section: Introductionmentioning

confidence: 99%

Proximity to multiple foraging habitats enhances seabirds’ resilience to local food shortages

Paredes¹,

Harding²,

Irons³

et al. 2012

Mar. Ecol. Prog. Ser.

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As central-place foragers, seabirds from colonies located close to multiple and/or productive marine habitats might experience increased foraging opportunities and enhanced resilience to food shortages. We tested whether this hypothesis might explain divergent trends in 3 populations of black-legged kittiwakes Rissa tridactyla, a surface-feeding piscivore, in the eastern Bering Sea. We simultaneously studied the foraging behavior, diet, nutritional stress, and breeding performance of chick-rearing kittiwakes from 2 continental shelf colonies (St. Paul and St. George) and an oceanic colony (Bogoslof). Although shelf-based forage fishes were rare or absent in bird diets during the cold study year, not all kittiwakes from the 3 colonies concentrated foraging along the productive shelf break habitats. Compared to the oceanic colony, birds from both shelf-located colonies had lower chick provisioning rates, higher levels of nutritional stress, and lower breeding performance. Although birds from both shelf-based colonies foraged in nearby neritic habitats during daytime, birds from St. George, a stable population located closest to the continental shelf break, also conducted long overnight trips to the ocean basin to feed on lipid-rich myctophids. In contrast, birds from St. Paul, a declining population located farthest from shelf break/oceanic habitats, fed exclusively over the shelf and obtained less high-energy food. Birds from Bogoslof, an increasing population, foraged mainly on myctophids close to the colony in the oceanic basin and Aleutian coast habitats. Our study suggests that proximity to multiple foraging habitats may explain divergent population trends among colonies of kittiwakes in the southeastern Bering Sea.

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Section: Introductionmentioning

confidence: 99%

Proximity to multiple foraging habitats enhances seabirds’ resilience to local food shortages

Paredes¹,

Harding²,

Irons³

et al. 2012

Mar. Ecol. Prog. Ser.

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“…Rissa brevirostris Kitaysky et al 2005 Klaassen & Bech 1992; Øyan & Anker-Nilssen 1996;Kitaysky 1999;Mullers et al 2009 Cerorhinca monocerata 480-620 g…”

Section: ; Niizuma and Yamamura 2004mentioning

confidence: 99%

Assimilation efficiency and growth of Rhinoceros Auklet chicks fed with Japanese Sand Lance and krill

et al. 2015

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Abstract. The assimilation efficiency and growth of Rhinoceros AukletThe assimilation efficiency (corrected with nitrogen retention) of the sand lance-fed chicks (82.8 0.5 ) was significantly higher than the krill-fed chicks (76.6 0.6 ). During the experiment, daily mass increments of the sand lance-fed chicks were 11.0 4.7 (g/d, n 12) and of the krill-fed chicks 9.7 2.7 (g/d, n 14). Sand lance-fed chicks gained body mass significantly faster than did krill-fed chicks after controlling for the significant age effect. Krill may be inadequate for chick growth of the auklets due to the poorer lipid content, compared with sand lance.

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“…Therefore, we considered the total mass of high quality supplementary meals to be the most important consideration when developing an effective supplementation protocol. Pilchards Sardinops sagax spp., of the order Clupeiiformes, are 'oily' fish rich in nutrients, with high energy content relative to other potential shearwater prey (Mullers et al 2009). Therefore, we selected the Australian pilchard S. sagax neopilchardus as the supplementary food source to be used in our experiments.…”

Section: Chick Supplementary Feedingmentioning

confidence: 99%

Divergence in chick developmental patterns among wedge-tailed shearwater populations

McDuie¹,

Goulding²,

Peck³

et al. 2013

Mar. Ecol. Prog. Ser.

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Mechanisms of population divergence in seabirds are poorly understood. We evaluated whether divergent patterns of chick development among wedge-tailed shearwater Puffinus pacificus populations are facultative responses to short-term fluctuations in food availability, or fixed colony-specific phenomena potentially associated with differences in local resource availability. Supplementary feeding at Heron Island increased food intake to levels equal to, or greater than, those observed at Lord Howe Island. In supplemented chicks, mass accumulation per gram of food received was inversely related to current body stores, up to a maximum storage level set by body size. Significantly, maximum storage was lower for Heron Island than for Lord Howe Island chicks at equivalent body size. In contrast, relative allocation to skeletal growth did not differ between supplemented and control chicks, was not influenced by body condition and did not increase to levels observed at Lord Howe Island. Overall, the present study showed that supplemented chicks were unable to use short-term increases in food availability to increase relative mass stores or rates of skeletal development, implying that both life-history parameters have some colony-specific components that are divergent between the locations of this study. Our findings add weight to previous studies suggesting that phenotypic plasticity and/or genetic drift due to philopatry cannot fully explain patterns of morphological, behavioural and physiological divergence among these 2 shearwater colonies.KEY WORDS: Colony-specific development · Chick growth · Local adaptation · Puffinus pacificus · Supplementary feedingResale or republication not permitted without written consent of the publisher

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The importance of lipid-rich fish prey for Cape gannet chick growth: are fishery discards an alternative?

Cited by 36 publications

References 33 publications

Proximity to multiple foraging habitats enhances seabirds’ resilience to local food shortages

Proximity to multiple foraging habitats enhances seabirds’ resilience to local food shortages

Assimilation efficiency and growth of Rhinoceros Auklet chicks fed with Japanese Sand Lance and krill

Divergence in chick developmental patterns among wedge-tailed shearwater populations

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