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Mostrando ítems 61-70 de 2029
Bottom-up effects may not reach the top: the influence of ant-aphid interactions on the spread of soil disturbances through trophic chains
(The Royal Society, 2012-06-20)
Soil disturbances that increase nutrient availability may trigger bottom-up cascading effects along trophic chains. However, the strength and sign of these effects may depend on attributes of the interacting species. Here, ...
Stromal-derived factor 1 directly promotes genes expressed within the ovulatory cascade in feline cumulus oocyte complexes
(Springer/Plenum Publishers, 2018-03)
Purpose We hypothesized that the chemokine SDF1/CXCR4 system was present in feline cumulus-oocyte complexes (COCs) and that COCs cultured with SDF1 would directly upregulate gene expression in the ovulatory cascade. Methods ...
Unexpected inhibitory cascade in the molariforms of sloths (Folivora, Xenarthra): a case study in xenarthrans honouring Gerhard Storch’s open-mindedness
(Národní muzeum, 2020)
The inhibitory cascade (IC) represents a developmental model that explains the evolution of molar relative sizes, originally described in rodents but later validated in several mammalian groups. The IC comprises signalling ...
Fish but not macroinvertebrates promote trophic cascading effects in high density submersed plant experimental lake food webs in two contrasting climate regions
(MDPI, 2017)
Predators play a key role in the functioning of shallow lakes. Differences between the response of temperate and subtropical systems to fish predation have been proposed, but experimental evidence is scarce. To elucidate ...
Mammal defaunation as surrogate of trophic cascades in a biodiversity hotspot
(2013-07-01)
Preserving large tracts of natural habitats is essential to maintain biodiversity. Nevertheless, even large areas may still suffer from less visible impacts such as loss of ecological processes. Because mapping ecological ...
Mammal defaunation as surrogate of trophic cascades in a biodiversity hotspot
(2013-07-01)
Preserving large tracts of natural habitats is essential to maintain biodiversity. Nevertheless, even large areas may still suffer from less visible impacts such as loss of ecological processes. Because mapping ecological ...
Estimating fish production in the itaipu reservoir (Brazil): The relationship between fish trophic guilds, limnology, and application of morphoedaphic index
(2014-10-01)
Many experimental studies contributed to the development of the theory of the lacustrine food web, disclosing the important paper of the fish, for decades ignored by the limnology. This work is based on the hypothesis of ...
Pestimating fish production in the itaipu reservoir (Brazil): The relationship between fish trophic guilds, limnology, and application of morphoedaphic index
(2014-01-01)
Many experimental studies contributed to the development of the theory of the lacustrine food web, disclosing the important paper of the fish, for decades ignored by the limnology. This work is based on the hypothesis of ...
Retroactive Signaling in Short Signaling Pathways
(Public Library of Science, 2012-07)
In biochemical signaling pathways without explicit feedback connections, the core signal transduction is usually described as a one-way communication, going from upstream to downstream in a feedforward chain or network of ...