A review of estimates of daily energy expenditure and food intake in cormorants (Phalacrocorax spp.)

Ridgway, Mark S.

doi:10.1016/j.jglr.2009.10.002

Cited by 41 publications

(36 citation statements)

References 37 publications

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“…They obtained the total number of birds in a colony of increasing size by multiplying the number of nests by a factor of four (Engström, 2001) and used a conservative figure of 300 g for the mean daily food intake. Method 2 was based on the review by Ridgway (2010) who suggested a per capita consumption by adult cormorants of 542 and 436 g per day in the nesting and non-nesting seasons, respectively. Estimates of the number of birds during the open water season were based on a method developed by P. Rusanen (pers.…”

Section: Methodsmentioning

confidence: 99%

“…life, the daily food intake of chicks was assumed to be 82, 202, 332 and 433 g respectively, and thereafter 436 g (Ridgway, 2010). In both methods, the total fish consumption by cormorants during the non-breeding period was estimated to be 25% of the consumption during the breeding period (April to July) as suggested in the Finnish cormorant management plan (Anonymous, 2005).…”

Section: Speciesmentioning

confidence: 99%

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Perch (Perca fluviatilis) and pikeperch (Sander lucioperca) in the diet of the great cormorant (Phalacrocorax carbo) and effects on catches in the Archipelago Sea, Southwest coast of Finland

Salmi¹,

Auvinen²,

Raitaniemi³

et al. 2015

Fisheries Research

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Section: Methodsmentioning

confidence: 99%

Section: Speciesmentioning

confidence: 99%

Perch (Perca fluviatilis) and pikeperch (Sander lucioperca) in the diet of the great cormorant (Phalacrocorax carbo) and effects on catches in the Archipelago Sea, Southwest coast of Finland

Salmi¹,

Auvinen²,

Raitaniemi³

et al. 2015

Fisheries Research

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“…The two-sample DLW method requires holding large animals for over an hour, and that lengthy period of restraint can cause abandonment of offspring or altered behaviour (Schultner et al, 2010;Hinsley et al, 2011). Obtaining direct estimations of daily energy expenditure would be useful for validating estimates from bioenergetic models used to quantify the impact of cormorants on fisheries (Ridgway, 2010). Such values would complement estimations of metabolism obtained from cormorants in dive tanks using respirometry (e.g.…”

Section: Introductionmentioning

confidence: 99%

Counting calories in cormorants: dynamic body acceleration predicts daily energy expenditure measured in pelagic cormorants

Stothart

Elliott

Wood

et al. 2016

Journal of Experimental Biology

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The integral of the dynamic component of acceleration over time has been proposed as a measure of energy expenditure in wild animals. We tested that idea by attaching accelerometers to the tails of freeranging pelagic cormorants (Phalacrocorax pelagicus) and simultaneously estimating energy expenditure using doubly labelled water. Two different formulations of dynamic body acceleration, [vectorial and overall DBA (VeDBA and ODBA)], correlated with mass-specific energy expenditure (both R 2 =0.91). VeDBA models combining and separately parameterizing flying, diving, activity on land and surface swimming were consistently considered more parsimonious than time budget models and showed less variability in model fit. Additionally, we observed evidence for the presence of hypometabolic processes (i.e. reduced heart rate and body temperature; shunting of blood away from non-essential organs) that suppressed metabolism in cormorants while diving, which was the most metabolically important activity. We concluded that a combination of VeDBA and physiological processes accurately measured energy expenditure for cormorants.

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“…The present study identified the dietary composition of cormorants at Lower Lake Constance in autumn/winter 2011/12 and 2012/13. Ridgway (2010) reviewed the recent literature on the daily food intake (DFI) of cormorants (Phalacrocorax spp.) and recommended a consumption of 436 g·d −1 in the non-nesting season.Čech and Vejřík (2011) calculated the DFI of P. carbo sinensis as an average of the results of different methods, time-energy budget, doubly-labelled water, and stomach and pellet analysis as well as direct observation, and suggested a DFI of 397 g·d −1 .…”

Section: Discussionmentioning

confidence: 99%

The great Cormorant (Phalacrocorax carbo) at lower lake Constance/Germany: dietary composition and impact on commercial fisheries

Gaye-Siessegger¹

2014

Knowl. Managt. Aquatic Ecosyst.

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Key-words: cormorants' diet, fisheries yield, hard parts, stomach content analysisAt lower lake Constance, the number of cormorants (Phalacrocorax carbo) has greatly increased during the last 15 years. An investigation of their diet can help to estimate the impact on fish and fisheries. Therefore, 282 cormorants were collected for stomach content analysis in autumn/winter 2011/12 and 2012/13. A total of 4019 fish or hard parts of 16 species were identified in the diet of cormorants. Fish length and weight were reconstructed from dimensions of hard parts using regression equations. Perch was the most frequent species (composition by number = 41.5%). Based on composition by weight, the most important species in the diet of cormorants was tench (Tinca tinca) with 47.0%, followed by Northern pike (Esox lucius), perch (Perca fluviatilis) and European whitefish (Coregonus lavaretus) with 23.9%, 7.2% and 6.9%, respectively. The dietary composition significantly differed between autumn and winter. Fish of high commercial value played a considerable part in the cormorants' diet. The impact of cormorants on grayling (Thymallus thymallus) could not be assessed due to the low number of birds from the spawning grounds of grayling at the outlet of lower lake Constance. RÉSUMÉLe grand Cormoran (Phalacrocorax carbo) au lac inférieur de Constance/Allemagne : composition du régime alimentaire et impact sur la pêche commerciale Mots-clés :alimentation du cormoran, pêche, parties osseuses, analyse du contenu stomacal Au lac inférieur de Constance, le nombre de cormorans (Phalacrocorax carbo) a fortement augmenté au cours des 15 dernières années. Une étude de leur régime alimentaire peut aider à estimer l'impact sur les poissons et la pêcherie. Par consé-quent, 282 cormorans ont été prélevés pour l'analyse du contenu de l'estomac à l'automne/hiver 2011/12 et 2012/13. Un total de 4019 poissons ou de parties dures de 16 espèces ont été identifiées dans le régime alimentaire des cormorans. La longueur du poisson et le poids ont été estimés à partir des dimensions de parties dures en utilisant des équations de régression. La perche était l'espèce la plus fréquente (composition en nombre = 41,5 %). Basé sur la composition en poids, les espèces les plus importantes dans le régime alimentaire des cormorans ont été la tanche (Tinca Tinca) avec 47,0 %, suivi par le brochet (Esox lucius), la perche (Perca fluviatilis) et le corégone (Coregonus lavaretus) avec 23,9 %, 7,2 % et 6,9 %, respectivement. La composition du régime alimentaire diffère significativement entre l'automne et l'hiver. Les poissons à haute valeur commerciale tiennent une place considérable dans le régime alimentaire des cormorans. L'impact des cormorans sur les ombres (Thymallus thymallus) n'a pas pu être évalué en raison du faible nombre d'oiseaux provenant des zones de frai de l'ombre à la sortie du lac inférieur de Constance.

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A review of estimates of daily energy expenditure and food intake in cormorants (Phalacrocorax spp.)

Cited by 41 publications

References 37 publications

Perch (Perca fluviatilis) and pikeperch (Sander lucioperca) in the diet of the great cormorant (Phalacrocorax carbo) and effects on catches in the Archipelago Sea, Southwest coast of Finland

Perch (Perca fluviatilis) and pikeperch (Sander lucioperca) in the diet of the great cormorant (Phalacrocorax carbo) and effects on catches in the Archipelago Sea, Southwest coast of Finland

Counting calories in cormorants: dynamic body acceleration predicts daily energy expenditure measured in pelagic cormorants

The great Cormorant (Phalacrocorax carbo) at lower lake Constance/Germany: dietary composition and impact on commercial fisheries

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