The conditional benefits of cannibalism for wood frog tadpoles (lithobates sylvaticus)

Wood frog tadpoles have an incredible ability to rapidly adapt to changing conditions, and when population densities become high tadpoles often become cannibalistic. Cannibalism potentially represents an ideal diet by composition, and should be beneficial to the growth and development of cannibalistic individuals. To test the relative efficacy of cannibalism to growth and development we conducted multiple feeding experiments. Results indicate that cannibalism represents a better alternative to starvation and provides some benefit to development and survival of tadpoles over low quality diets. However, cannibalism can be detrimental to tadpole growth and/or develop­ment relative to diets of similar protein content. Additionally, tadpoles raised individually appear to initially avoid consuming the cannibalistic diet, and may continue to do so until they face the risk of starvation. Conversely, when tadpoles were raised in groups providing them with compe­tition, they immediately fed upon the cannibal diet. Our results suggest that competition, rather than dietary quality is likely the driving force behind cannibalistic behaviour unless tadpoles oth­erwise face the risk of starvation

Multidimensional Conservation Laws: Overview, Problems, and Perspective

Some of recent important developments are overviewed, several longstanding open problems are discussed, and a perspective is presented for the mathematical theory of multidimensional conservation laws. Some basic features and phenomena of multidimensional hyperbolic conservation laws are revealed, and some samples of multidimensional systems/models and related important problems are presented and analyzed with emphasis on the prototypes that have been solved or may be expected to be solved rigorously at least for some cases. In particular, multidimensional steady supersonic problems and transonic problems, shock reflection-diffraction problems, and related effective nonlinear approaches are analyzed. A theory of divergence-measure vector fields and related analytical frameworks for the analysis of entropy solutions are discussed.Comment: 43 pages, 3 figure

The deuteron: structure and form factors

A brief review of the history of the discovery of the deuteron in provided. The current status of both experiment and theory for the elastic electron scattering is then presented.Comment: 80 pages, 33 figures, submited to Advances in Nuclear Physic

A simplified vacuum apparatus for collecting small nudibranchs

Volume: 12Start Page: 142End Page: 14

A COMPACT AQUARIUM UNIT FOR MACRO PHOTOGRAPHY

Volume: 13Start Page: 196End Page: 19

A zoogeographical study of the amphibians and reptiles of eastern Canada.

Amphibians and reptiles comprise an important major segment of the vertebrate fauna of Canada: major in the sense of numbers of individuals; and important in the sense of economic value. The numbers of insects, other invertebrates, small vertebrates and especially rodents that these animals consume during a summer season are astronomical and attests to their economic value to Canadian agriculture and forestry

First Canadian record of the Sacoglossan Elvsia chlorotica Gould

Volume: 9Start Page: 353End Page: 35