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Topic: Population biology


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In the News (Sun 27 Dec 09)

  
  Population - Wikipedia, the free encyclopedia
In biology, plant and animal populations are studied, in particular, in a branch of ecology known as population biology, and in population genetics.
Populate, as a verb, means the process of populating a geographic area, as by procreation or immigration.
Population transfer is a term referring to a policy by which a state forces the movement of a large group of people out of a region, most frequently on the basis of their ethnicity or religion.
en.wikipedia.org /wiki/Population   (2296 words)

  
 Population Genetics of Plant Pathogens | APSnet Education Center   (Site not responding. Last check: 2007-11-04)
Population biology is relevant to plant pathology because plant diseases are caused by populations of parasites.
Evolutionary biology is relevant to plant pathology because pathogen populations evolve in response to control methods and it often is not clear whether a new pathogen population is derived from a pre-existing pathogen population or represents a host-jump or a new species of pathogen.
As the resistance in the plant population increases due to an increase in the frequency of resistant individuals, the ability of the pathogen to reproduce is reduced and the overall level of disease decreases.
www.apsnet.org /education/AdvancedPlantPath/Topics/PopGenetics/top.htm   (2297 words)

  
 population (biology) - Hutchinson encyclopedia article about population (biology)
Since the pond is a habitat, one can consider the population of duckweed in a habitat and forming part of the community of plants and animals there.
However, it is also possible to use the term population for all the organisms of one species in a large geographical area, for example the elephant population in Africa.
Measuring the size of a population is quite difficult and requires careful sampling of the habitat and careful calculation to estimate population size.
encyclopedia.farlex.com /population+(biology)   (341 words)

  
 Biological Diversity 9
The study of factors that affect growth, stability, and decline of populations is population dynamics.
Population stability is often proceeded by a "crash" since the growing population eventually outstrips its available resources.
The 1987 population was estimated at a puny 5 billion.
www.estrellamountain.edu /faculty/farabee/biobk/BioBookpopecol.html   (3271 words)

  
 Population Biology
Assessing covariability among populations in the presence of intraseries correlation: Columbia River spring-summer chinook salmon (Oncorhynchus tshawytscha) stocks.
Aspects of the structure and dynamics of an exploited central California population of white sturgeon (Acipenser transmontanus).
Population cycles caused by inter-age density-dependent mortality in young fish and crustaceans.
wfcb.ucdavis.edu /www/Faculty/Loo/BotsfordSiteFiles/BotsfordPub.html   (2274 words)

  
 THEORETICAL POPULATION BIOLOGY, 1999
For a given subdivided population, the effective size for a sex-linked locus may be larger or smaller than that for an autosomal locus, depending on the sex ratio, variance and covariance of family size, and the extent of subdivision.
The value of population differentiation under an island model of dispersal and the increase of differentiation with geographical distance in one- and two-dimensional "isolation by distance" models are then obtained for a generalization of the FST measure of population structure, as a function of "effective" mutation, migration, and population size parameters.
The governing equations are derived for the dynamics of a population consisting of organisms which reproduce by laying one egg at the time, on the basis of a simple physiological model for the uptake and use of energy.
www.cicred.org /rdr/rdr_uni/revue99-100/16-99-100.html   (3961 words)

  
 MPWG: Review of the Ecology and Population Biology of Goldenseal
A characteristic of goldenseal population monitoring, as is also the case for ginseng, is the level of confidentiality, or even secrecy, involved in the record keeping of accurate locations of the existing or monitored populations.
Similarly, site data and vegetation data for each monitored population are required, in order to be able to determine if the intensively monitored populations are representative of the majority of goldenseal populations in the state (see section 6.3.3, and field forms in appendices 1 and 2).
Assuming a state has the responsibility of monitoring 10 populations for population dynamics data, this should easily be accomplished by a two-person team in 10 to 15 working days (to allow for inclement weather, as data recording requires meticulous work difficult in pouring rain).
www.nps.gov /plants/medicinal/pubs/goldenseal.htm   (10942 words)

  
 Population Biology Simulations
Users may select from a variety of allele frequency configurations and several different inbreeding coefficients within populations (all populations are assumed to have the same inbreeding coefficient).
32 populations are simulated simultaneously and the results are displayed as a frequency histogram.
Users may select from several different population means and variances, selective optima and strengths of selection (through the variance of the selection function), and heritabilities.
darwin.eeb.uconn.edu /simulations/simulations.html   (923 words)

  
 Chapter 2: Plant Population Biology and the Invasion Process   (Site not responding. Last check: 2007-11-04)
This rate of spread is similliar to the population growth rate of an organism in an ideal, resource limitless environment and is therefore believed to be more a function of intrinsic biological characteristics of the species than of its growing environment.
In the absence of continual safe site avaliablility, the advancement of source populations (patches) of invasive plant species is influenced most by the biological characteristics that influence their population growth.
Populations of invasive plant species also expand by satellite populations that are often isolated from their source.
www.weedcenter.org /textbook/2_radosevich_invasion_process.html   (4143 words)

  
 CLEP: Biology
The Biology examination covers material that is usually taught in a one-year college general biology course.
Most textbooks used in college-level biology courses cover the topics in the outline given earlier, but the approaches to certain topics and the emphasis given to them may differ.
To prepare for the Biology exam, it is advisable to study one or more college textbooks, which can be found in most college bookstores.
www.collegeboard.com /student/testing/clep/ex_bio.html   (487 words)

  
 Glencoe Online Science Quiz Chapter
Predation is a positive benefit to the population of prey organisms because it tends to keep them below their ___________.
Populations that have reached carrying capacity usually have __________.
The carrying capacity of a population is the highest level at which a population can be __________.
www.glencoe.com /qe/science.php?qi=2495   (170 words)

  
 Interesting Facts about Population Growth Mathematical Models
The mathematical model based on this idea is that the population size for one generation depends on the size of the previous generation, and it is a multiple.
This means that the population is now a function of the current population, the population the year before, the year before that, etc. Please note that f implies a generic function and it is different in equation (4) and (5).
Since humans tend not to limit their population size voluntarily, population reduction tends to be accomplished through the "positive" checks of famine, disease, poverty and war.
www.arcytech.org /java/population/facts_math.html   (3912 words)

  
 Population Biology   (Site not responding. Last check: 2007-11-04)
The observed density of a population is 1 animal/20 acres (Seal et al., 1990), with the average population range of about 60 -100 acres (Dietz and Baker, 1993).
The minimum viable population density has been estimated to be 0.4 individuals/sq km (Silvia and Downing, 1994).
This may be alarming to conservationalists but Pope (1996) in her study on the tamarin population suggests that the lion tamarins may be adapted to a homozygous genetic background.
www.personal.psu.edu /students/a/z/azh112/Population_Biology.htm   (636 words)

  
 Bio 431 - Conservation Biology
Topics include history of biological conservation, population viability analysis, minimum viable populations, island biogeography, and the concepts of rarity and diversity.
Habitat loss, direct reduction of animal and plant populations by a variety of mechanisms, introduction of alien animals and plants, and the ensuing cascade of extinctions, effect ecosystem, community, and population levels of biological organization.
The field of Conservation Biology is a theoretical and empirical response by ecologists and evolutionary biologists to address these issues.
academic.reed.edu /biology/courses/BIO431/conservationbiology.html   (375 words)

  
 UC Riverside 1999-2000 - Population Biology
INTERDEPARTMENTAL PH.D. The primary aim of the interdepartmental doctoral program in Population Biology is to provide persons uniquely trained in the five areas of population biology: population genetics, population ecology, microevolution, demography, and statistical population biology.
Although there is no foreign language requirement, a reading knowledge of a foreign language may be required or recommended by the guidance committee, if a significant body of literature pertinent to the student's field of specialization is written in that language.
Having passed the qualifying examinations, each candidate conducts experimental or theoretical research in population biology and submits a dissertation in accordance with the requirements of the Graduate Division, UCR.
www.catalog.ucr.edu /1999-00/pobl.html   (274 words)

  
 Population and Evolutionary Biology abstracts   (Site not responding. Last check: 2007-11-04)
To examine the genetics and population biology of this obligate biotrophic parasite, three PstI- genomic DNA libraries were constructed from DNA of three isolates that originated from Kentucky, USA.
A population genetic study was initiated to study the population dynamics of the ectomycorrhizal false-truffle Rhizopogon vinicolor.
In addition, we are studying whether the alga provides nutrients for the fungus, whether the fungus parasitizes the alga, whether fungal hyphae provide a matrix that anchors the unicellular alga to form a mat and whether fungal melanins protect the alga from the harmful effects of intense light at high elevations.
www.fgsc.net /fungalgenetics2001/popbioabs.htm   (8840 words)

  
 The KLI Theory Lab - Evolutionary Theory
EB refers to the collective disciplines of biology that treat the evolutionary process and the characteristics of populations of organisms, as well as ecology, behavior, and systematics.
Among the specific fields included are population dynamics and distribution, evolutionary ecology, ecological genetics, theoretical models, conservation biology, agroecosystem studies, and bioresource management.
Papers for Systematic Biology are to be original contributions of theory, principles, and methods of systematics as well as evolution, morphology, biogeography, paleontology, genetics, and classification.
www.kli.ac.at /theorylab/Areas/EB.html   (3889 words)

  
 ANSP - Patrick Center - Quantitative Population Biology - James N. McNair
At the present time, my principal applied research interests are in the individual- and population-level effects of novel chemical stressors (e.g., antibiotics) on populations of aquatic and soil organisms, watershed-scale modeling of effects of landcover- and landuse-derived stressors on stream health, and the ecology and control of exotic invasive plants in urban parks.
My research on chemically stressed populations employs both theoretical and experimental approaches and is a natural extension of my basic research in the area of physiologically structured population models.
McNair, J.N. and Goulden, C.E. The dynamics of age-structured populations with a gestation period: density-independent growth and egg ratio methods for estimating the birth rate.
www.acnatsci.org /~mcnair   (1280 words)

  
 The Evolution of Population Biology - Cambridge University Press   (Site not responding. Last check: 2007-11-04)
This unique collection of essays deals with the foundation and historical development of population biology and its relationship to population genetics and population ecology on the one hand and to the rapidly growing fields of molecular quantitative genetics, genomics and bioinformatics on the other.
The population genetics of life-history evolution Brian Charlesworth; 12.
Nine relatives from one African ancestor: Population biology and evolution of the Drosophila melanogaster subgroup species Daniel Lachaise, Pierre Capy, Marie-Louise Cariou, Dominique Joly, Francoise Lemeunier and Jean R. David; Part IV.
www.cambridge.org /uk/catalogue/catalogue.asp?isbn=0521814375   (472 words)

  
 Bio 366 - Population Biology: Ecology and Evolution
The basic concepts of population ecology and population genetics are explored to provide an in-depth understanding of evolutionary biology and conservation biology.
Topics include population growth and regulation, demography, interspecific interactions, population genetics, quantitative genetics, evolution of phenotypic plasticity, evolution of life histories, and basic molecular evolution.
The course is taught by Robert H. Kaplan.
academic.reed.edu /biology/courses/BIO366   (115 words)

  
 Hochberg, M.E. and Ives, A.R., eds.: Parasitoid Population Biology.
Extraordinary in the diversity of their lifestyles, insect parasitoids have become extremely important study organisms in the field of population biology, and they are the most frequently used agents in the biological control of insect pests.
Parasitoid Population Biology will likely be an important influence on research well into the twenty-first century and will provoke discussion amongst parasitoid biologists and population biologists.
The editors and contributors are recognized experts at the international level, and are at the cutting edge of parasitoid population biology research.
pup.princeton.edu /titles/7009.html   (502 words)

  
 Biology Lessons Part 2
Lessons for teaching biology to prospective elementaryschool teachers will be posted at this site.
These lessons were developedin a biology course (Natural Sciences 412C, Process and Inquiry in the LifeSciences) for senior Liberal Studies majors at San Diego State University.The lessons can readily be adapted by practicing teachers for use in elementaryschool classrooms.
Each lesson has six parts, including a biology lesson, knowledge mapping exercise, and glossary for students and for teachers, a teachers' guide for both the biology lesson and knowledge mapping exercise, and a table of persistent alternative ideas.
naturalsciences.sdsu.edu /ta   (217 words)

  
 Global Population Dynamics Database   (Site not responding. Last check: 2007-11-04)
This facility has been constructed by researchers at the NERC Centre for Population Biology (funded by the UK Natural Environment Research Council), in collaboration with the National Center for Ecological Analysis and Synthesis, Santa Barbara (funded by the USA National Science Foundation), and the Department of Ecology and Evolution, University of Tennessee.
It is, by far, the largest collection of animal and plant population data in the world, and brings together nearly five thousand time series in one database.
The GPDD does not contain human population data, for a good online human population guide we recommend the Population Links pages at the Department of Social Statistics at the University of Southampton.
cpbnts1.bio.ic.ac.uk /gpdd   (391 words)

  
 Reinert-Alumni Memorial Library: Organismal & Population Biology Subject Guide   (Site not responding. Last check: 2007-11-04)
Full text from dozens of core journals in biology, botany, ecology, and evolutionary biology, among many other subjects (all years except most recent).
Indexes 5,900 journals in the sciences, including biology, plus all cited references captured from the indexed articles (1992-present).
Professional organization of educators in biology and the life sciences.
reinert.creighton.edu /resources/suguides/biology/organismal.htm   (765 words)

  
 Molecular Population Biology Lab home page, Lund University
The genetic diversity and relatedness in the Scandinavian wolf population is studied with 30 microsatellite markers, as a part of the SKANDULV project.
Genetic population structure in relation to post-glacial colonization patterns is studied in e.g.
Despite this important fact, pathogens are seldom studied in natural wild animal populations, and thus the major body of published works have either a strict human or a strict veterinary medicine focus.
wallace.teorekol.lu.se /ekol_inst/mol_ekol   (1210 words)

  
 Population Biology   (Site not responding. Last check: 2007-11-04)
Population: all the individuals (potentially interbreeding) in an area
Population Dynamics: the growth and regulation of populations
But with 6 billion people there are problems: refer to your class notes on poverty levels and red bullets on p.
www.eeb.uconn.edu /Courses/BIO102/BIO102S01/Popbio.html   (548 words)

  
 Biology Lessons Part 2
Lessons for teaching biology to prospective elementary school teachers will be posted at this site.
These lessons were developed in a biology course (Natural Sciences 412C, Process and Inquiry in the Life Sciences) for senior Liberal Studies majors at San Diego State University.
The lessons can readily be adapted by practicing teachers for use in elementary school classrooms.
naturalsciences.sdsu.edu   (230 words)

  
 Amazon.ca: The Theory of Island Biogeography (Monographs in Population Biology): Books   (Site not responding. Last check: 2007-11-04)
The theory builds on the first principles of population ecology and genetics to explain how distance and area combine to regulate the balance between immigration and extinction in island populations.
With its emphasis on on-going processes of colonization and extinction, it provided a new framework to explain patterns in species diversity and served as a counterpoint to hypotheses relying on chance and solitary historical events.
Originally published as part of the Princeton University Press' Monographs in Population Biology series, Robert MacArthur's and Edward O. Wilson's "Theory Of Island Biogeography" is regarded by many as the most influential tome in theoretical ecology published in the latter half of the 20th Century.
www.amazon.ca /exec/obidos/ASIN/069108050X   (924 words)

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