• Publications
  • Influence
For decades, plant ecologists have used naturally occurring stable isotope ratios to disentangle ecological and physiological processes. The methodology can also become a very powerful tool in animalExpand
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A niche for isotopic ecology
Fifty years ago, GE Hutchinson defined the ecological niche as a hypervolume in n-dimensional space with environmental variables as axes. Ecologists have recently developed renewed interest in theExpand
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Dietary, Phylogenetic, and Ecological Correlates of Intestinal Sucrase and Maltase Activity in Birds
  • C. M. Rio
  • Biology
  • Physiological Zoology
  • 1 September 1990
Intestinal sucrase and maltase activities were measured in three species of hummingbirds and 11 species of passerine birds from western Mexico. Maximal sucrase activity standardized by nominal areaExpand
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Ten years of experimental animal isotopic ecology
Summary 1. Ten years ago Gannes et al. (1997, Stable isotopes in animal ecology: assumptions, caveats, and a call for laboratory experiments. Ecology , 78 , 1271‐1276, 1998) identified four majorExpand
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Information theory and hypothesis testing: a call for pluralism
A major paradigm shift is occurring in the approach of ecologists to statistical analysis. Expand
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An Experimental and Comparative Study of Dietary Modulation of Intestinal Enzymes in European Starlings (Sturnus vulgaris)
European starlings (Sturnus vulgaris) are omnivorous passerine birds that include significant amounts of starchy grains (e.g., oats and barley) in their diet when insects and fruit are not available.Expand
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Effects of sugar concentration on hummingbird feeding and energy use
Abstract We investigated the effect of sucrose concentration on the patterns of feeding, gut function, and energy management in the nectar-eating Chilean hummingbird Sephanoides sephanoides. WeExpand
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Physiological Correlates of Preference and Aversion for Sugars in Three Species of Birds
We studied preferences of red-winged blackbirds, common grackles, and European starlings for the disaccharide sucrose and the monosaccharides glucose and fructose. We also tested the hypothesis thatExpand
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Ecological and evolutionary implications of digestive processes: Bird preferences and the sugar constituents of floral nectar and fruit pulp
Plants pollinated and dispersed by different groups of birds offer different kinds of sugars in nectar and fruit pulp. The preferences and physiological traits of avian pollinators and seedExpand
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Ecological Effectiveness: Conservation Goals for Interactive Species
Abstract: The rarity or absence of highly interactive species leaves a functional void that can trigger linked changes leading to degraded or simplified ecosystems. A preliminary analysis indicates aExpand
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