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Articles 61 - 66 of 66
Full-Text Articles in Life Sciences
Population Inertia And Its Sensitivity Tochanges In Vital Rates And Population Structure, David N. Koons, R. R. Holmes, J. B. Grand
Population Inertia And Its Sensitivity Tochanges In Vital Rates And Population Structure, David N. Koons, R. R. Holmes, J. B. Grand
David N. Koons
Because the (st)age structure of a population may rarely be stable, studies of transient population dynamics and population momentum are becoming ever more popular. Yet, studies of ‘‘population momentum’’ are restricted in the sense that they describe the inertia of population size resulting from a demographic transition to the stationary population growth rate. Although rarely mentioned, inertia in population size is a general phenomenon and can be produced by any demographic transition or perturbation. Because population size is of central importance in demography, conservation, and management, formulas relating the sensitivity of population inertia to changes in underlying vital rates and …
Frog Virus 3 Prevalence In Tadpole Populations Inhabiting Cattle-Access And Non-Access Wetlands In Tennessee., Matthew J. Gray, Debra L. Miller, Anne C. Schmutzer, Charles A. Baldwin
Frog Virus 3 Prevalence In Tadpole Populations Inhabiting Cattle-Access And Non-Access Wetlands In Tennessee., Matthew J. Gray, Debra L. Miller, Anne C. Schmutzer, Charles A. Baldwin
Debra L Miller
Ranaviruses have been associated with most of the reported larval anuran die-offs in the United States. It is hypothesized that anthropogenically induced stress may increase pathogen prevalence in amphibian populations by compromising immunity. Cattle use of wetlands may stress resident tadpole populations by reducing water quality. We isolated a Ranavirus from green frog Rana clamitans (n = 80) and American bullfrog R. catesbeiana (n = 104) tadpoles collected at 5 cattle-access and 3 non-access wetlands on the Cumberland Plateau, Tennessee, USA. Sequencing confirmed Frog virus 3 (FV3); therefore, we compared its prevalence between tadpole populations inhabiting cattle-access and non-access wetlands, …
Application Of Microsatellite Dna Markers To Discriminate Maternal And Genetic Effects On Scalation And Behavior In Multiply-Sired Garter Snake Litters, Gordon Burghardt
Application Of Microsatellite Dna Markers To Discriminate Maternal And Genetic Effects On Scalation And Behavior In Multiply-Sired Garter Snake Litters, Gordon Burghardt
Gordon Burghardt
Incomplete knowledge of pedigrees sometimes limits the methods of estimating quantitative genetic parameters (heritability, genetic correlation) in nature and may result in estimates that are inflated by nongenetic sources of variation. North American garter snakes and their allies provide a model system for investigating evolutionary quantitative genetics, but estimates of quantitative genetic parameters in these snakes are mostly based on offspring-dam regression and full-sib analysis, methods that fail to discriminate between maternal genetic, maternal environmental, and direct genetic effects on traits of interest. Using data from the garter snake Thamnophis sirtalis, we demonstrate that microsatellite DNA markers can be used …
Attitudes Of Local Communities Toward Biodiversity Conservation In The Uluguru Rain Forests Of The Eastern Arc Mountains Of Tanzania, Geofrey Soka
Geofrey Soka
No abstract provided.
Feeding In Extreme Flows: Behavior Compensates For Mechanical Constraints In Barnacle Cirri, Luke P. Miller
Feeding In Extreme Flows: Behavior Compensates For Mechanical Constraints In Barnacle Cirri, Luke P. Miller
Luke P. Miller
Plastic morphological changes in response to environmental cues can allow organisms to adapt to their local environment. Barnacle feeding legs (cirri) exhibit substantial plasticity in size and shape along wave exposure gradients on rocky shores, but only up to a certain limit in maximum water velocities. Above the limit, the morphology of the cirri becomes invariant. Behavioral observations of barnacles feeding at a wave-exposed shore indicate that the fast response time for feeding motions allows barnacles to avoid potentially damaging flows associated with breaking waves, while still allowing feeding between wave impacts. The ability of barnacles to avoid individual waves …
A Comparison Of Once Versus Twice Per Week Training On Leg Press Strength In Women, J. Burt, R. Wilson, Jeffrey Willardson
A Comparison Of Once Versus Twice Per Week Training On Leg Press Strength In Women, J. Burt, R. Wilson, Jeffrey Willardson
Jeffrey Willardson
The purpose of this study was to compare strength differences between 2 groups of untrained women, who performed a single set of the leg press exercise once or twice per week. Methods. Twenty-one women were divided randomly into 2 groups: Group 1 (n=10) performed a single set of the leg press exercise once per week, while Group 2 (n=11) performed a single set of the leg press exercise twice per week for a period of 8 weeks. Throughout the duration of the study, an amount of resistance was utilized that allowed for a single set of 6 to 10 repetitions …