Experimental Evidence for Food Limitation of Egg Production in Gulls

1991 ◽  
Vol 22 (2) ◽  
pp. 94 ◽  
Author(s):  
Louise Hiom ◽  
Mark Bolton ◽  
Pat Monaghan ◽  
David Worrall
Keyword(s):  
Experimental Evidence ◽  
Egg Production ◽  
Food Limitation

FOOD LIMITATION ON BROOD SIZE: EXPERIMENTAL EVIDENCE IN THE EURASIAN KESTREL

Ecology ◽  
1997 ◽  
Vol 78 (7) ◽  
pp. 2043-2050 ◽  
Author(s):  
Jürgen Wiehn ◽  
Erkki Korpimäki
Keyword(s):  
Experimental Evidence ◽  
Brood Size ◽  
Food Limitation ◽  
Eurasian Kestrel

Life cycle of Calanus finmarchicus in the lower St. Lawrence Estuary: the imprint of circulation and late timing of the spring phytoplankton bloom

2001 ◽  
Vol 58 (4) ◽  
pp. 647-658 ◽  
Author(s):  
Stéphane Plourde ◽  
Pierre Joly ◽  
Jeffrey A Runge ◽  
Bruno Zakardjian ◽  
Julian J Dodson
Keyword(s):  
Population Dynamics ◽  
Life Cycle ◽  
Production Rate ◽  
Egg Production ◽  
Phytoplankton Bloom ◽  
Food Limitation ◽  
Calanus Finmarchicus ◽  
Lawrence Estuary ◽  
Egg Production Rate ◽  
St Lawrence Estuary

The life cycle of Calanus finmarchicus in the lower St. Lawrence estuary is described based on observations of female egg production rate, population stage abundance, and chlorophyll a biomass collected over 7 years (1991–1997) at a centrally located monitoring station. The mean seasonal pattern shows maximum abundance of females in May, but peak population egg production rate and naupliar (N3–N6) abundance occur in early July just after onset of the late spring – early summer phytoplankton bloom. The population stage structure is characterized by low summer abundance of early copepodite stages C1–C3 and high stage C5 abundance in autumn. Between 1994 and 1997, there was important interannual variation in both timing (up to 1 month) and amplitude (five- to eight-fold) of population reproduction. Patterns of seasonal increase of C5 abundance in autumn suggest interannual variations of both timing and magnitude of deep upstream advection of this overwintering stage. Thus, the main features of C. finmarchicus population dynamics in the central lower St. Lawrence Estuary are (i) late reproduction resulting from food limitation prior to the onset of the summer phytoplankton bloom, (ii) probable export of early developmental stages during summer, and (iii) advection into the central lower St. Lawrence Estuary of overwintering stage C5 in autumn from downstream regions. These results support the hypothesis that circulation, mainly driven by discharge from the St. Lawrence River and its tributaries, is a key factor governing population dynamics of C. finmarchicus in this region.

Chronic food limitation of egg production in populations of copepods of the genusAcartia in the San Francisco estuary

Estuaries ◽  
2005 ◽  
Vol 28 (4) ◽  
pp. 541-550 ◽  
Author(s):  
Wim J. Kimmerer ◽  
Nissa Ferm ◽  
Mary Helen Nicolini ◽  
Carolina Peñalva
Keyword(s):  
San Francisco ◽  
Egg Production ◽  
Food Limitation ◽  
San Francisco Estuary

Clutch Size of Kestrels: Seasonal Decline and Experimental Evidence for Food Limitation under Fluctuating Food Conditions

Oikos ◽  
1998 ◽  
Vol 83 (2) ◽  
pp. 259 ◽  
Author(s):  
Erkki Korpimäki ◽  
Jürgen Wiehn ◽  
Erkki Korpimaki ◽  
Jurgen Wiehn
Keyword(s):  
Experimental Evidence ◽  
Clutch Size ◽  
Food Limitation ◽  
Food Conditions ◽  
Seasonal Decline

Courtship Feeding and Osprey Reproduction

The Auk ◽  
1985 ◽  
Vol 102 (3) ◽  
pp. 479-492 ◽  
Author(s):  
Alan Poole
Keyword(s):  
Egg Production ◽  
Reproductive Output ◽  
Food Limitation ◽  
Egg Laying ◽  
Feeding Rates ◽  
Supplemental Food ◽  
Mate Fidelity ◽  
Courtship Feeding ◽  
Extra Food ◽  
Female Weight

Abstract A female Osprey (Pandion haliaetus) usually is fed exclusively by its mate between pair formation and egg-laying. Laying dates and courtship periods-but not clutch size, egg size, breeding success, or female weight reserves-were correlated (negatively) with the prelaying feeding rates of 12 females breeding in a coastal Massachusetts colony. However, the age of a pair and of its bond influenced laying dates and courtship periods more than food intake. Older and more experienced pairs arrived earlier and laid eggs more quickly than younger pairs. As an independent test of food limitation in Ospreys producing eggs, supplemental food was provided to 4 nests during courtship. Supplemental food did not influence a female's reproductive output or timing, but males at nests receiving extra food showed reduced rates of foraging. Egg production boosted the daily energy expenditure of female Ospreys by only about 20% and females gained little weight during courtship, suggesting that egg-laying is not a demanding process in this species. Because age and mate retention had a greater effect on the reproductive output and timing of female Ospreys than rates of food consumption during courtship, and because there was evidence that poorly fed females were less willing to copulate and less faithful to their mates than well-fed females, it is argued that Osprey courtship feeding may function primarily to ensure mate fidelity.

scholarly journals Liver Antioxidants in Relation to Beak Morphology, Gizzard Size and Diet in the Common Eider Somateria mollissima

Antioxidants ◽  
2019 ◽  
Vol 8 (2) ◽  
pp. 31 ◽  
Author(s):  
Anders Møller ◽  
Karsten Laursen ◽  
Filiz Karadas
Keyword(s):  
Vitamin E ◽  
Coenzyme Q10 ◽  
Egg Production ◽  
Food Limitation ◽  
Carcinus Maenas ◽  
Bird Species ◽  
Common Eider ◽  
Somateria Mollissima ◽  
Total Carotenoids ◽  
Low Levels

Antioxidants in the liver are particularly abundant in capital breeders that rely on stored resources for egg production. Capital breeders like eider (hereafter common eider) Somateria mollissima have disproportionately large livers with low levels of coenzyme Q10 when compared to other bird species. Concentrations of total carotenoids and vitamin E in the livers of eiders were smaller than predicted for similarly sized bird species. Eiders with high body condition estimated as body mass relative to skeletal body size had high levels of total carotenoids and low levels of coenzyme Q10. The concentration of total carotenoids per gram of liver increased with age, and vitamin E and total carotenoids accumulated during the winter onwards from February to peak at the start of incubation in April. Total vitamin E, total carotenoids, and coenzyme Q10 per gram of liver decreased with increasing beak volume. The size of the empty gizzard increased with increasing liver mass but decreased with total carotenoids and coenzyme Q10. The main components of the diet were blue mussels Mytilus edulis (40%), draft whelk Nassarius reticulatus (27%), and periwinkle Littorina littorea (10%). The concentration of vitamin E increased with the number of razor clams Ensis sp. and draft whelks in the gizzard and the concentration of total carotenoids increased with the number of beach crabs Carcinus maenas. These observations are consistent with the hypothesis that eiders are limited in their levels of antioxidants through food limitation. Furthermore, they imply that diet and morphological characters involved in food acquisition and processing are important determinants of the level of antioxidants in the liver.

scholarly journals Food limitation of egg production by a marine, planktonic copepod in the sea off southern California1

1980 ◽  
Vol 25 (6) ◽  
pp. 991-998 ◽  
Author(s):  
David M. Checkley
Keyword(s):  
Egg Production ◽  
Food Limitation ◽  
Planktonic Copepod

Nesting mallards (Anas platyrhynchos) forecast brood-stage food limitation when selecting habitat: experimental evidence

Oecologia ◽  
2000 ◽  
Vol 122 (4) ◽  
pp. 582-586 ◽  
Author(s):  
H. Pöysä ◽  
J. Elmberg ◽  
K. Sjöberg ◽  
P. Nummi
Keyword(s):  
Experimental Evidence ◽  
Anas Platyrhynchos ◽  
Food Limitation ◽  
Brood Stage
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