Now showing items 361-370 of 386
Scale and strength of oak-mesophyte interactions in a transitional oak-hickory forest
(NRC Research Press, 2018)
Forests in eastern North America are undergoing rapid compositional changes as they experience novel climate, disturbance, and pest conditions. One striking pattern is the replacement of canopy oaks (Quercus spp.) by mesic, ...
Low Genetic Variation in the Heath Hen Prior to Extinction and Implications for the Conservation of Prairie-Chicken Populations
(Kluwer Academic Publishers; Springer, 2006-02)
Low genetic variation is often considered to contribute to the extinction of species when they reach small population sizes. In this study we examined the mitochondrial control region from museum specimens of the Heath Hen ...
Alarm responses in the crayfish Orconectes virilis and Orconectes propinquus
(Kluwer Academic Publishers-Plenum Publishers; Plenum Publishing Corporation ; Springer Science+Business Media, 1994-07)
Individuals of two species of crayfish ( Orconectes virilis and O. propinquus ) were tested in the laboratory for responses to chemicals released from physically damaged conspecifics. Individuals of O. propinquus did not ...
Wide but not impermeable: Testing the riverine barrier hypothesis for an Amazonian plant species
(Wiley, 2017-05)
Wallace’s riverine barrier hypothesis postulates that large rivers, such as the Amazon and its tributaries, reduce or prevent gene flow between populations on opposite banks, leading to allopatry and areas of species ...
Isolation and partial characterization of dinoflagellate chromatin
(Elsevier, 1974-05-31)
Chromatin was prepared by two different methods from isolated nuclei of Gyrodinium cohnii (Cryptothecodinium cohnii) and Peridinium trochoideum. These isolation procedures are different from those generally used to prepare ...
Genetic rescue of remnant tropical trees by an alien pollinator
(Royal Society of London, 2001)
Habitat fragmentation is thought to lower the viability of tropical trees by disrupting their mutualisms with native pollinators. However, in this study, Dinizia excelsa (Fabaceae), a canopy-emergent tree, was found to ...
Forests of the past: a window to future changes
(AAAS, 2008)
The study of past forest change provides a necessary historical context for evaluating the outcome of human-induced climate change and biological invasions. Retrospective analyses based on fossil and genetic data greatly ...
A reinvestigation of Diichnia Read from the New Albany Shale of Kentucky
(Elsevier, 1992-12-03)
The type material of Diichnia Read, supplemented by several additional specimens, has been restudied and a lectotype designated. Special attention has been paid to the nature of the primary vascular system, the pattern of ...
rtREV: An Amino Acid Substitution Matrix for Inference of Retrovirus and Reverse Transcriptase Phylogeny
(Springer-Verlag; Springer-Verlag New York Inc., 2002-07)