scholarly journals Relative Importance of Biotic and Abiotic Soil Components to Plant Growth and Insect Herbivore Population Dynamics

PLoS ONE ◽  
2010 ◽  
Vol 5 (9) ◽  
pp. e12937 ◽  
Author(s):  
Martijn L. Vandegehuchte ◽  
Eduardo de la Peña ◽  
Dries Bonte
Keyword(s):  
Population Dynamics ◽  
Plant Growth ◽  
Insect Herbivore ◽  
Relative Importance ◽  
Soil Components

Handbook of Soils for Landscape Architects

1999 ◽  
Author(s):  
Robert F. Keefer
Keyword(s):  
Urban Planning ◽  
Plant Growth ◽  
Landscape Architecture ◽  
Soil Science ◽  
Experienced Teacher ◽  
Detailed List ◽  
Soil Components ◽  
Book Covers ◽  
Soil Surveys ◽  
Concise Description

Written in a clear, accessible style, this book covers the fundamental aspects of soil science with an emphasis on topics useful to landscape architects and professionals in related fields. The book begins with a discussion of soil surveys developed in different countries, followed by a concise description of soil components and how the interactions between air, water, and nutrients affect plant growth. It examines methods for controlling erosion, particularly in light of modern irrigation techniques. It describes the chemistry of plant growth, devotes four chapters to macro- and micro-nutrients, and features a detailed discussion of ways to diagnose and correct plant disorders. It also looks at the engineering aspects of soils and includes a detailed list of references for further information. Written by an experienced teacher with an extensive background in landscape architecture, this volume will be an invaluable source for students and researchers in architecture, horticulture, and urban planning.

Life history and environmental influences on population dynamics in sockeye salmon

2014 ◽  
Vol 71 (8) ◽  
pp. 1198-1208 ◽  
Author(s):  
Douglas C. Braun ◽  
John D. Reynolds
Keyword(s):  
Population Dynamics ◽  
Life History ◽  
Population Growth ◽  
Growth Rates ◽  
Environmental Conditions ◽  
Sockeye Salmon ◽  
Life History Traits ◽  
Relative Importance ◽  
Population Growth Rates ◽  
Habitat Variables

Understanding linkages among life history traits, the environment, and population dynamics is a central goal in ecology. We compared 15 populations of sockeye salmon (Oncorhynchus nerka) to test general hypotheses for the relative importance of life history traits and environmental conditions in explaining variation in population dynamics. We used life history traits and habitat variables as covariates in mixed-effect Ricker models to evaluate the support for correlates of maximum population growth rates, density dependence, and variability in dynamics among populations. We found dramatic differences in the dynamics of populations that spawn in a small geographical area. These differences among populations were related to variation in habitats but not life history traits. Populations that spawned in deep water had higher and less variable population growth rates, and populations inhabiting streams with larger gravels experienced stronger negative density dependence. These results demonstrate, in these populations, the relative importance of environmental conditions and life histories in explaining population dynamics, which is rarely possible for multiple populations of the same species. Furthermore, they suggest that local habitat variables are important for the assessment of population status, especially when multiple populations with different dynamics are managed as aggregates.

scholarly journals The relative importance of direct and indirect effects of hunting mortality on the population dynamics of brown bears

2015 ◽  
Vol 282 (1798) ◽  
pp. 20141840 ◽  
Author(s):  
Jacinthe Gosselin ◽  
Andreas Zedrosser ◽  
Jon E. Swenson ◽  
Fanie Pelletier
Keyword(s):  
Population Dynamics ◽  
Population Growth ◽  
Indirect Effects ◽  
Ursus Arctos ◽  
Brown Bear ◽  
Relative Importance ◽  
Direct And Indirect Effects ◽  
Negative Effects ◽  
Hunting Pressure ◽  
Demographic Rates

There is increasing evidence of indirect effects of hunting on populations. In species with sexually selected infanticide (SSI), hunting may decrease juvenile survival by increasing male turnover. We aimed to evaluate the relative importance of direct and indirect effects of hunting via SSI on the population dynamics of the Scandinavian brown bear ( Ursus arctos ). We performed prospective and retrospective demographic perturbation analyses for periods with low and high hunting pressures. All demographic rates, except yearling survival, were lower under high hunting pressure, which led to a decline in population growth under high hunting pressure ( λ = 0.975; 95% CI = 0.914–1.011). Hunting had negative indirect effects on the population through an increase in SSI, which lowered cub survival and possibly also fecundity rates. Our study suggests that SSI could explain 13.6% of the variation in population growth. Hunting also affected the relative importance of survival and fecundity of adult females for population growth, with fecundity being more important under low hunting pressure and survival more important under high hunting pressure. Our study sheds light on the importance of direct and indirect effects of hunting on population dynamics, and supports the contention that hunting can have indirect negative effects on populations through SSI.

scholarly journals Multimodel inference to quantify the relative importance of abiotic factors in the population dynamics of marine zooplankton

2018 ◽  
Vol 181 ◽  
pp. 91-98 ◽  
Author(s):  
Gert Everaert ◽  
Yana Deschutter ◽  
Marleen De Troch ◽  
Colin R. Janssen ◽  
Karel De Schamphelaere
Keyword(s):  
Population Dynamics ◽  
Abiotic Factors ◽  
Relative Importance ◽  
Multimodel Inference ◽  
Marine Zooplankton

Insect herbivore stoichiometry: the relative importance of host plants and ant mutualists

2008 ◽  
Vol 33 (4) ◽  
pp. 497-502 ◽  
Author(s):  
PATRICK ABBOT ◽  
JOSH GRINATH ◽  
JULIA BROWN ◽  
EMILY PEEDEN ◽  
DAN ERICKSON ◽  
...  
Keyword(s):  
Host Plants ◽  
Insect Herbivore ◽  
Relative Importance
Sign in / Sign up

Export Citation Format

Share Document