Trophic Cascade
Mostrando 1-12 de 17 artigos, teses e dissertações.
-
1. Updating the role of matrix metalloproteinases in mineralized tissue and related diseases
Abstract Bone development and healing processes involve a complex cascade of biological events requiring well-orchestrated synergism with bone cells, growth factors, and other trophic signaling molecules and cellular structures. Beyond health processes, MMPs play several key roles in the installation of heart and blood vessel related diseases and cancer, ran
J. Appl. Oral Sci.. Publicado em: 09/09/2019
-
2. Mamíferos de maior porte em paisagens tropicais alteradas: seu papel em cascatas tróficas e fatores que determinam sua distribuição / Large mammals in altered tropical forest landscapes: their role in trophic cascade and factors that determine their distribution
Nesta dissertação investigamos o papel dos mamíferos em cascatas tróficas nas florestas tropicais, e os efeitos da configuração espacial e qualidade do habitat assim como das atividades humanas atuais sobre a distribuição de mamíferos de maior porte em uma paisagem rural de Mata Atlântica. No primeiro capítulo, através de uma revisão da literatu
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 17/11/2011
-
3. Análise da composição da dieta de seis espécies de peixes coexistentes em um reservatório tropical (Reservatório de Ribeirão das Lajes, Piraí-RJ) / Analysis of the composition of the diet of six fish species coexisting in a tropical reservoir
The present study analyzed the digestive contents of 221 individuals of six fish species, from Ribeirão das Lajes reservoir (Piraí-RJ). There were 44 specimens of Loricariichthys castaneus, 56 Parauchenipterus striatulus, 46 Metynnis maculatus, 40 Astyanax bimaculatus, 31 Astyanax parahybae and 4 Rhamdia quelen. The aim was to establish their diets, throug
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 12/07/2010
-
4. Efeitos de peixes zooplanctívoros e onívoros sobre a resposta de comunidades planctônicas à fertilização por nutrientes
A teoria de cadeias alimentares prevê que a presença de onivoria pode atenuar os efeitos de cascata trófica e estabilizar as populações de autótrofos e herbívoros, as quais são desestabilizadas pela fertilização por nutrientes. Tendo em vista que muitos lagos e reservatórios tropicais encontram-se eutrofizados, estratégias que visem o controle do
Publicado em: 2009
-
5. Relações tróficas e limnológicas no reservatório de Itaipu: uma análise do impacto da biomassa pesqueira nas comunidades planctônicas / Trophic and limnological interactions in the Itaipu reservoir: an analysis of the impact of the fishing biomass in the planktonic communities
Many experimental studies contributed for the development of the theory of the lacustrine food web, disclosing the important paper of the fish, for decades ignored by the limnology. These studies, in its majority, had been developed in Europe and North America and the generality of the hypotheses supporting the theory was not tested yet in subtropical and tr
Publicado em: 2006
-
6. Diversidade de avifauna aquática nas represas do médio e baixo Rio Tietê (SP) e nos sistema de lagos do médio Rio Doce (MG) e sua relação com o estado trófico e a morfometria dos ecossistemas aquáticos.
Relationships between aquatic birds and the trophic state of freshwaters are not well known in tropical systems. In the present work the influence of some limnological variables on the structure of the aquatic bird comunnity was investigated for two distinct freshwater systems: The cascade of reservoirs in the middle and low portions of Tietê River (SP) and
Publicado em: 2003
-
7. A meta-analysis of the freshwater trophic cascade.
The generality of the trophic cascade has been an intensely debated topic among ecologists. We conducted a meta-analysis of 54 separate enclosure and pond experiments that measured the response of the zooplankton and phytoplankton to zooplanktivorous fish treatments. These results provide unequivocal support for the trophic cascade hypothesis in freshwater f
-
8. Gigantic cannibals driving a whole-lake trophic cascade
Trophic cascades have been a central paradigm in explaining the structure of ecological communities but have been demonstrated mainly through comparative studies or experimental manipulations. In contrast, evidence for shifts in trophic cascades caused by intrinsically driven population dynamics is meager. By using empirical data of a cannibalistic fish popu
The National Academy of Sciences.
-
9. Resource edibility and trophic exploitation in an old-field food web.
I tested a food web model that predicts how environmental productivity (nutrient supply) and top carnivores should mediate interactions among herbivores, edible plants, and plants that are resistant to herbivory because they possess anti-herbivore defenses. Feeding trials with the dominant grasshopper herbivore at the study site confirmed that certain plant
-
10. A trophic cascade regulates salt marsh primary production
Nutrient supply is widely thought to regulate primary production of many ecosystems including salt marshes. However, experimental manipulation of the dominant marsh grazer (the periwinkle, Littoraria irrorata) and its consumers (e.g., blue crabs, Callinectes sapidus, terrapins, Malaclemys terrapin) demonstrates plant biomass and production are largely contro
National Academy of Sciences.
-
11. R-Ras3/M-Ras Induces Neuronal Differentiation of PC12 Cells through Cell-Type-Specific Activation of the Mitogen-Activated Protein Kinase Cascade
R-Ras3/M-Ras is a novel member of the Ras subfamily of GTP-binding proteins which has a unique expression pattern highly restricted to the mammalian central nervous system. In situ hybridization using an R-Ras3 cRNA probe revealed high levels of R-Ras3 transcripts in the hippocampal region of the mouse brain as well as a pattern of expression in the cerebell
American Society for Microbiology.
-
12. Experimental evidence for a behavior-mediated trophic cascade in a terrestrial food chain
Predators of herbivorous animals can affect plant populations by altering herbivore density, behavior, or both. To test whether the indirect effect of predators on plants arises from density or behavioral responses in a herbivore population, we experimentally examined the dynamics of terrestrial food chains comprised of old field plants, leaf-chewing grassho
The National Academy of Sciences of the USA.