Now showing items 11-20 of 86
Do Physiological Integration and Soil Heterogeneity Influence the Clonal Growth and Foraging of Schoenoplectus pungens ?
(Kluwer Academic Publishers; Springer, 2005-11)
Physiological integration and foraging behavior have both been proposed as advantages for clonal growth in heterogeneous environments. We tested three predictions concerning their short- and long-term effects on the growth ...
Acceleration of Ambystoma tigrinum metamorphosis by corticotropin-releasing hormone
(Wiley Subscription Services, Inc., A Wiley Company, 2002-06-15)
Previous work of others and ours has shown that corticotropin-releasing hormone (CRH) is a positive stimulus for thyroid and interrenal hormone secretion in amphibian larvae and that activation of CRH neurons may mediate ...
Pollen dispersal of tropical trees (Dinizia excelsa: Fabaceae) by native insects and African honeybees in pristine and fragmented Amazonian rainforest.
(Elsevier, 2003)
Tropical rainforest trees typically occur in low population densities and rely on animals for cross-pollination. It is of conservation interest therefore to understand how rainforest fragmentation may alter the pollination ...
Invasive species of crayfish use a broader range of predation-risk cues than native species
(Kluwer Academic Publishers; Springer Science+Business Media, 2003-09)
The responses of invasive and native species of crayfish to conspecific and heterospecific alarm odors were recorded in the laboratory. Individuals of the North American invasive Procambarus clarkii responded just as ...
Spatial scales of seed and pollen-mediated gene flow in tropical forest trees
(Springer, 2008)
Gene flow via seed and pollen is a primary determinant of genetic and species diversity in plant communities at different spatial scales. This paper reviews studies of gene flow and population genetic structure in tropical ...
The role of immigrants in the assembly of the South American rainforest tree flora
(The Royal Society, 2004)
The Amazon lowland rainforest flora is conventionally viewed as comprising lineages that evolved in biogeographic isolation after the split of west Gondwana (ca. 100 Myr ago). Recent molecular phylogenies, however, identify ...
Effects of elevated atmospheric CO 2 on the nutritional ecology of C 3 and C 4 grass-feeding caterpillars
(Springer-Verlag, 2004-06)
It is plausible that the nutritional quality of C 3 plants will decline more under elevated atmospheric CO 2 than will the nutritional quality of C 4 plants, causing herbivorous insects to increase their feeding on C 3 ...
Genetic diversity of Cryptosporidium spp. in cattle in Michigan: implications for understanding the transmission dynamics
(Springer-Verlag, 2003-06)
Epidemiological and molecular data on 248 bovine, 17 human, and 16 water samples of Cryptosporidium spp. collected from the lower peninsula of Michigan between 1997 and 2000 were analysed. Cryptosporidium parvum bovine ...
Neohyadesia microtricha (Acari: Astigmata: Algophagidae): a new species from the sub-Antarctic
(Springer-Verlag; Springer-Verlag Berlin Heidelberg, 2001-01)
The sub-antarctic mite genus Neohyadesia (Acari: Astigmata) is known from two described taxa: N. signyi from Signy Island (South Orkney Islands, South Atlantic Province), and a subspecies, N. s. punctulata from Ile Kerguelen ...
Gut-Based Antioxidant Enzymes in a Polyphagous and a Graminivorous Grasshopper
(Kluwer Academic Publishers-Plenum Publishers; Plenum Publishing Corporation ; Springer Science+Business Media, 2002-07)
Graminivorous species of grasshoppers develop lethal lesions in their midgut epithelia when they ingest tannic acid, whereas polyphagous grass- hoppers are unaffected by ingested tannins. This study tests the hypothesis ...