Evidence of low daily food consumption by wolf spiders in meadowland and comparison with other cursorial hunters

We developed a foraging model for young fishes that incorporates handling and digestion rate to estimate daily food consumption. Feeding trials were used to quantify functional feeding response, satiation, and gut evacuation rate. Once parameterized, the foraging model was then applied to evaluate effects of prey type, prey density, water temperature, and fish size on daily feeding rate by age-0 (19–70 mm) pallid sturgeon (Scaphirhynchus albus). Prey consumption was positively related to prey density (for fish >30 mm) and water temperature, but negatively related to prey size and the presence of sand substrate. Model evaluation results revealed good agreement between observed estimates of daily consumption and those predicted by the model (r2 = 0.95). Model simulations showed that fish feeding on Chironomidae or Ephemeroptera larvae were able to gain mass, whereas fish feeding solely on zooplankton lost mass under most conditions. By accounting for satiation and digestive processes in addition to handling time and prey density, the model provides realistic estimates of daily food consumption that can prove useful for evaluating rearing conditions for age-0 fishes.

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Feeding ecology and daily food consumption of common sole, Solea vulgaris Quensel, juveniles on the French Atlantic coast

Journal of Fish Biology ◽

10.1111/j.1095-8649.1987.tb05735.x ◽

1987 ◽

Vol 30 (1) ◽

pp. 91-104 ◽

Cited By ~ 59

Author(s):

J. P. Lagardere

Keyword(s):

Food Consumption ◽

Feeding Ecology ◽

Atlantic Coast ◽

Daily Food Consumption ◽

Daily Food ◽

Common Sole

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Food Consumption of Walleye (Stizostedion vitreum vitreum) and Sauger (S. canadense) in Relation to Food Availability and Physical Conditions in Lake of the Woods, Minnesota, Shagawa Lake, and Western Lake Superior

Journal of the Fisheries Research Board of Canada ◽

10.1139/f77-229 ◽

1977 ◽

Vol 34 (10) ◽

pp. 1643-1654 ◽

Cited By ~ 36

Author(s):

William A. Swenson

Keyword(s):

Body Weight ◽

Food Consumption ◽

Yellow Perch ◽

Prey Density ◽

Lake Superior ◽

Stizostedion Vitreum ◽

Lake Of The Woods ◽

Daily Food Consumption ◽

Western Lake ◽

Daily Food

Measurement of walleye (Stizostedion vitreum vitreum) daily food consumption rates and prey density in Lake of the Woods, Minnesota, Shagawa Lake, and western Lake Superior showed a general relationship exists between the two variables. Daily food consumption increased from 1 to 3% of body weight at prey densities up to 400 mg∙m−3. Abundance of age 0 yellow perch (Perca flavescens) in Lake of the Woods, Minnesota, and Shagawa Lake resulted in much higher prey densities and daily food consumption to 4% of body weight. In Lake Superior where walleye fed exclusively on rainbow smelt (Osmerus mordax), prey density did not exceed 300 mg ∙m−3 and daily food consumption averaged less than 2.5% of body weight.Hourly food consumption by walleye changed in response to variation in prey availability and light intensity. Night feeding predominated during July and August when walleye fed on pelagic age 0 yellow perch. Feeding appeared to be continuous or crepuscular during June and September when larger demersal prey fish or invertebrates were eaten. Food consumption declined when prey concentrated near aquatic macrophytes and under conditions of high light intensity. Walleye daily food consumption was not influenced by a change in temperature from 20 to 15 °C.Daily food consumption of Lake of the Woods, Minnesota sauger (Stizostedion canadense) averaged less than walleye and was influenced by wave activity and prey density. Demersal prey was utilized by sauger throughout the 24 h-day. Key words: Percidae, food consumption, behavior, feeding, walleye, Stizostedion vitreum vitreum, sauger, S. canadense, light

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