Now showing items 21-30 of 86
Molecular systematics reveals cryptic Tertiary diversification of a widespread tropical rainforest tree
(The University of Chicago Press, 2003)
The broad geographic range of many Neotropical rain forest tree species implies excellent dispersal abilities or range establishment that preceded the formation of current dispersal barriers. In order to initiate historical ...
Antioxidants in Grasshoppers: Higher Levels Defend the Midgut Tissues of a Polyphagous Species Than a Graminivorous Species
(Kluwer Academic Publishers-Plenum Publishers; Plenum Publishing Corporation ; Springer Science+Business Media, 2003-03)
Polyphagous grasshoppers consume plants that contain markedly greater amounts of potentially prooxidant allelochemicals than the grasses eaten by graminivorous grasshoppers. Therefore, levels of antioxidant defenses ...
Ants ( Azteca sp.) as potential biological control agents in shade coffee production in Chiapas, Mexico
(Kluwer Academic Publishers; Springer Science+Business Media, 2002-12)
The role of Azteca sp. ants as potential biological control agents was studied in an organic coffee farm in Chiapas, Mexico. Individual larvae of Pieris rapae were placed on trees with artificially enhanced ant activity ...
Antioxidants in the Midgut Fluids of a Tannin-Tolerant and a Tannin-Sensitive Caterpillar: Effects of Seasonal Changes in Tree Leaves
(Kluwer Academic Publishers-Plenum Publishers; Plenum Publishing Corporation ; Springer Science+Business Media, 2003-05)
The seasonal decline in foliar nutritional quality in deciduous trees also effects the availability of essential micronutrients, such as ascorbate and α-tocopherol, to herbivorous insects. This study first examined whether ...
Isolation and characterization of 15 polymorphic microsatellite loci in Tetragastris panamensis (Burseraceae), a widespread forest canopy tree in the Neotropics
(Springer, 2009)
Tetagastris panamensis is a tropical forest canopy tree that is broadly distributed across Central and South America. We isolated 15 microsatellite loci and characterized them in populations from Panama and Ecuador. The ...
Isolation, Characterization, and Evolutionary Divergence of Mouse RNase 6: Evidence for Unusual Evolution in Rodents
(Springer-Verlag; Springer Science + Business Media Inc., 2004-11)
The evolution of the ribonuclease A (RNase A) vertebrate-specific enzyme family is interesting in that specific gene lineages appear to be responding to unique selective pressures in wildly diverse manners to generate ...
Phylogenetic analysis of the lux operon distinguishes two evolutionarily distinct clades of Photobacterium leiognathi
(Springer-Verlag, 2004-05)
The luminous marine bacterium Photobacterium mandapamensis was synonymized several years ago with Photobacterium leiognathi based on a high degree of phenotypic and genetic similarity. To test the possibility that P. ...
Responses of the Crab Heterozius rotundifrons to Heterospecific Chemical Alarm Cues: Phylogeny vs. Ecological Overlap
(Kluwer Academic Publishers-Plenum Publishers; Springer Science + Business Media, Inc., 2005-03)
The big-handed brachyuran crab Heterozius rotundifrons extends the time spent in its anti-predator posture, limb extended posture, if exposed to chemical cues from crushed conspecifics. In this study, we tested whether ...
A COMPARATIVE STUDY OF THE DEFENSE SYNDROMES OF SOME NEW ZEALAND MARINE CRUSTACEA
(Brill Academic Publishers; Koninklijke Brill, Leiden 2000 ; Springer Science+Business Media, 2000-10)
Five sympatric species of intertidal decapod crustaceans were studied in the field and laboratory with regard to the mechanisms used for predator defense. The species are sympatric and represent a gradient from high ...
Anthropogenic N deposition and the fate of 15 NO 3 − in a northern hardwood ecosystem
(Kluwer Academic Publishers; Springer Science+Business Media, 2004-06)
Human activity has substantially increased atmospheric NO 3 − deposition in many regions of the Earth, which could lead to the N saturation of terrestrial ecosystems. Sugar maple ( Acer saccharum Marsh.) dominated northern ...