909 resultados para OCEANIC PREDATOR


Relevância:

20.00% 20.00%

Publicador:

Resumo:

Each plate accompanied by guard sheet with descriptive letterpress.

Relevância:

20.00% 20.00%

Publicador:

Resumo:

At head of title: State of California, Dept. of Fish and Game, Marine Research Committee.

Relevância:

20.00% 20.00%

Publicador:

Resumo:

Cosponsored by U.S. Fish and Wildlife Service, Forest Service, and the National Oceanic and Atmospheric Administration.

Relevância:

20.00% 20.00%

Publicador:

Resumo:

"The work is mainly a grammar and dictionary of only one Oceanic language--that of Efate in the New Hebrides. The comparative portions refer only to a very few other Oceanic languages, and are quoted only to illustrate certain features in the grammar of the Efate."--Review by S. H. Ray in Man, VIII (1908) no. 40.

Relevância:

20.00% 20.00%

Publicador:

Resumo:

Thesis (Master's)--University of Washington, 2016-06

Relevância:

20.00% 20.00%

Publicador:

Resumo:

We tested the phenotypic responses of larval striped marsh frogs (Limnodynastes peronii) to the odonate nymph predator, Aeshna brevistyla. When reared in the presence of dragonfly nymphs feeding upon conspecifics of L. peronii larvae the tadpoles showed a strong change in morphology. Morphological changes included an increase in total tail height, but also an unexpected marked change in head-body shape. In addition, we examined how tadpole development, as well as mass and length at metamorphosis, was affected by exposure to dragonfly nymphs. Larval development of L. peronii was strongly influenced by exposure to the predatory behaviour of dragonfly nymphs. Predator-induced tadpoles had significantly slower developmental rates than control larvae. Although metamorphs of non-exposed L. peronii were approximately 33% lighter than predator-exposed metamorphs and possessed lower jump distances, after adjusting for mass there was no difference in jump distance. The newly described morphological response may assist in more accurately relating morphological plasticity to fitness.

Relevância:

20.00% 20.00%

Publicador:

Resumo:

1. We investigated the morphological responses of larval Rana lessonae to the presence of two predators with substantially different prey-detection and capture techniques; larval dragonflies (Aeshna cyanea) and the Pumpkinseed Sunfish (Lepomis gibossus). 2. We also examined the functional implications of any predator-induced morphological variation on their swimming ability by assessing performance during the initial stages of a startle response. 3. We found the morphological responses of larval R. lessonae were dependent on the specific predator present. Tadpoles raised in the presence of dragonfly larvae preying upon conspecific tadpoles developed total tail heights 5.4% deeper and tail muscles 4.7% shallower than tadpoles raised in a non-predator environment, while tadpoles raised with sunfish possessed tails 2% shallower and tail muscles 2.5% higher than non-predator-exposed tadpoles. 4. Predator-induced morphological variation also significantly influenced swimming performance. Tadpoles raised with sunfish possessed swimming speeds 9.5 and 14.6% higher than non- and dragonfly predator groups, respectively. 5. Thus, the expression of these alternative predator-morphs leads to a functional trade-off in performance between the different environments.