Results 271 to 280 of about 456,694 (300)
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Selective predation, parasitism, and trophic cascades in a bluegill–Daphnia–parasite system
Oecologia, 2007As disease incidence increases worldwide, there is increased interest in determining the factors controlling parasitism in natural populations. Recently, several studies have suggested a possible role of predation in reducing parasitism, but this idea has received little experimental attention.
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Acorn selection by Mexican jays: a test of a tri-trophic symbiotic relationship hypothesis
Oecologia, 1997By caching acorns, jays serve as important dispersal agents for oak (Quercus) species. Yet little is known about which acorn characteristics affect selection by jays. In the traditional model of jay/oak symbiosis, large, brown, ripe acorns free of invertebrate parasites (e.g., Curculio acorn weevils) are selected by jays.
J Andrew, Hubbard, Guy R, McPherson
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Ecology, 1999
Conjecture abounds while evidence is limited concerning indirect protection afforded plants by carnivorous predators in terrestrial ecosystems, apropos of the Hairston-Smith-Slobodkin (HSS) hypothesis. We conducted a field experiment with a suspected trophic cascade.
D. R. Strong +3 more
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Conjecture abounds while evidence is limited concerning indirect protection afforded plants by carnivorous predators in terrestrial ecosystems, apropos of the Hairston-Smith-Slobodkin (HSS) hypothesis. We conducted a field experiment with a suspected trophic cascade.
D. R. Strong +3 more
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Trophic index (TRIX) at selected stations of Central and South Adriatic
2017As one of the indicators related to the marine ecosystem condition in the National list of indicators, trophic index (TRIX) is included [1]. The TRIX index is a logarithmic formula of four state variables, which are directly related to productivity: chlorophyll-a (Chl, mg/L), oxygen as the absolute percentage deviation from oxygen saturation (DO ...
Bralić, Marija +4 more
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Journal of the American Geriatrics Society, 1988
An hypothesis is presented which emphasizes the key role of specific trophic factor-receptor interactions in the development of the brain. We postulate that very early in development neurons become dependent on external factors (mainly neuropeptides) for guidance and survival. These requirements are the key to the selection process which results in the
R E, Fine, J B, Rubin
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An hypothesis is presented which emphasizes the key role of specific trophic factor-receptor interactions in the development of the brain. We postulate that very early in development neurons become dependent on external factors (mainly neuropeptides) for guidance and survival. These requirements are the key to the selection process which results in the
R E, Fine, J B, Rubin
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Cox-2 selective inhibition reverses the trophic properties of gastrin
Gastroenterology, 2001M YAO, B RANA, M WOLFE
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