Optimal Foraging and Beyond: How Starlings Cope with Changes in Food Availability

@article{BautistaSopelana1998OptimalFA,
  title={Optimal Foraging and Beyond: How Starlings Cope with Changes in Food Availability},
  author={Luis M. Bautista Sopelana and Joost M. Tinbergen and Popko Wiersma and Alejandro Kacelnik},
  journal={The American Naturalist},
  year={1998},
  volume={152},
  pages={543 - 561}
}
Foraging adaptations include behavioral and physiological responses, but most optimal foraging models deal exclusively with behavioral decision variables, taking other dimensions as constraints. To overcome this limitation, we measured behavioral and physiological responses of European starlings Sturnus vulgaris to changes in food availability in a laboratory environment. The birds lived in a closed economy with a choice of two foraging modes (flying and walking) and were observed under two… 

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References

SHOWING 1-10 OF 46 REFERENCES

Energetics, physiology and vertebrate ecology.

  • W. Karasov
  • Biology, Environmental Science
    Trends in ecology & evolution
  • 1986

Strategies of mass change in breeding birds

From a revision of the literature, it is deduced that IML is mainly found among large birds with precocial development, while IMC is typical of smaller species with altricial development.

Hypothermia in foraging king penguins

It is shown here that the abdominal temperature of king penguins may fall to as low as 11 °C during sustained deep diving, which could indicate the slower metabolism of cooler tissues resulting from physiological adjustments associated with diving per se, could at least partly explain why penguins and possibly marine mammals can dive for such long durations.

Diurnal variation in flight performance and hence potential predation risk in small birds

  • N. MetcalfeSusan E. Ure
  • Environmental Science
    Proceedings of the Royal Society of London. Series B: Biological Sciences
  • 1995
This work shows for the first time that natural diurnal variation in mass has a highly significant and disproportionate impact on flight performance: individual zebra finches were over 30 % slower at dusk than at dawn, despite being less than 7 % heavier.

Flight Energetics of Free-Living Sooty Terns

Metabolic rate during flight of Sooty Terns was determined to be 4.8 times standard metabolic rate (SMR), much lower than estimates of flight metabolism predicted from previously published equations.

Avian Energetics, Ecology, and Evolution

The discipline of evolutionary ecology, which developed during the 1960s and 1970s, focused on the management of energy in such diverse aspects of life history as foraging, migration, growth, and parent-offspring in-teraction.

Effect of Clutch Size and Time of Day on the Energy Expenditure of Incubating Starlings (Sturnus vulgaris)

  • H. Biebach
  • Environmental Science
    Physiological Zoology
  • 1984
The steady-state energy expenditure of incubating starlings (Sturnus vulgaris) was studied at different air temperatures, at day and at night, and on different clutch sizes, with consequences for the time and energy budget of free-living birds.

Foraging Decisions in Starlings (Sturnus vulgaris L.)

Six seasons of field work on the Dutch island Schierminnikoog were devoted tot testing the hypothesis that parent Starlings conform to the principle of caloric maximization in their choice of prey

Diving and foraging in the Common Eider

DEST is positively correlated over short series of dive-cycles over wintering Common Eiders Somateria mollissima and compared with an earlier study on Western Grebes Aechmophorus occidentalis.

Starlings and Optimal Foraging Theory: Modelling in a Fractal World

Behavioral ecologists must be concerned with this debate because it is important to establish the relationship between theoretical statements and empirical evidence and to be aware of what is being tested when biological data are compared with theoretical predictions.