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Assessing the evidence for latitudinal gradients in plant defence and herbivory
The empirical data do not support the widespread view that herbivory is generally more intense at lower latitudes, or that plants from low latitudes are generally better defended than are plants from higher latitudes; these results are counter to the prevailing thought on this topic.
Estimating foliage nitrogen concentration from HYMAP data using continuum, removal analysis
Protein content of diets dictates the daily energy intake of a free-ranging primate
It is shown that hypotheses traditionally used to explain vertebrate diet selection, such as energy or protein maximization, or avoidance of plant secondary metabolites, cannot explain the observed pattern of nutrient intake, and it is suggested that total energy intake may vary as a function of the composition of available food items.
REFERENCE INTERVALS AND PHYSIOLOGIC ALTERATIONS IN HEMATOLOGIC AND BIOCHEMICAL VALUES OF FREE-RANGING DESERT TORTOISES IN THE MOJAVE DESERT
- M. Christopher, K. Berry, I. Wallis, K. Nagy, B. Henen, C. C. Peterson
- Environmental ScienceJournal of wildlife diseases
- 1 April 1999
Clinical laboratory data was obtained and analyzed from free-ranging desert tortoises at three sites in the Mojave Desert between October 1990 and October 1995, to establish reference intervals, and to develop guidelines for the interpretation of laboratory data under a variety of environmental and physiologic conditions.
Sudies on low metabolisable energy wheats for poultry using conventional and rapid assay procedures and the effects of processing
1. A significant proportion of wheat cultivars grown in New South Wales had low apparent metabolisable energy (AME) values (< 13.0 MJ/kg dry matter) for growing broilers when determined by the…
Nutritional Ecology of Ateles chamek in lowland Bolivia: How Macronutrient Balancing Influences Food Choices
It is demonstrated that spider monkeys consumed a diverse array of ripe fruits to overcome periods of fig scarcity rather than vice versa; they could obtain sufficient protein on a diet of pure fruit; and unripe figs constituted a nutritionally rewarding and reliable food resource.
Egg Size and Annual Egg Production by Female Desert Tortoises (Gopherus agassizii): The Importance of Food Abundance, Body Size, and Date of Egg Shelling
Analysis of egg production in two Californian populations of desert tortoises in 1992 and 1993 showed that larger females produced eggs earlier in the year giving them a better opportunity to produce a second clutch that year, and much of the variation in reproductive output was not explained.
Antiherbivore Chemistry of Eucalyptus--Cues and Deterrents for Marsupial Folivores
- B. Moore, I. Wallis, J. Palá-Paúl, J. Brophy, R. Willis, W. Foley
- Environmental ScienceJournal of Chemical Ecology
- 1 September 2004
This work describes significant qualitative and quantitative variation in FPCs in several species that are important food sources for marsupial folivores and finds strong positive correlations between terpenes generally, and several monoterpenes in particular, and F PCs.
Conflicting demands on detoxification pathways influence how common brushtail possums choose their diets.
This study provides the first convincing evidence that herbivorous mammals can eat more by selecting mixed diets with a diversity of PSMs that make full use of their detoxification potential.
Putting plant resistance traits on the map: a test of the idea that plants are better defended at lower latitudes.
The results do not support the hypothesis that tropical plants have higher levels of resistance traits than do plants from higher latitudes, and if anything, plants haveHigher resistance toward the poles.