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by: Eve Mayert PhD
Eve Mayert PhD
GPA 3.72

Evelyn Gaiser

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Evelyn Gaiser
Class Notes
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This 3 page Class Notes was uploaded by Eve Mayert PhD on Monday October 12, 2015. The Class Notes belongs to PCB 3043 at Florida International University taught by Evelyn Gaiser in Fall. Since its upload, it has received 35 views. For similar materials see /class/221718/pcb-3043-florida-international-university in Biology at Florida International University.


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Date Created: 10/12/15
Lecture 7 Population Structure Goals Know the de nition of a population and the difference between structure and dynamics Know mechanisms driving spatial distribution patterns and how they are assessed Be able to describe different models of subpopulation dispersion Know techniques of measuring population size Be able to predict population stability from ageclass distribution Know how gender distribution can vary at conception and birth Be able to draw 3 types of survivorship curves Be able to describe population structure in a life table Be able to describe future population structure from a life table and calculate growth rates Outline Overview of population biology De nitions of population structure and dynamics Population Structure 1 Distribution a Geographic range b Even clumped and random distribution patterns within range c Subpopulation distribution models i Metapopulation ii Sourcesink iii Landscape d Dispersal 2 Size a N individualsarea b Measurements 7 whole counts subpopulation counts markrecapture 3 Age structure a Stable age distribution b Stationary age distribution c Growing and aging populations 4 Gender Distribution a Primary sex ratio b Secondary sex ratio Population Dynamics 1 Variables a Death rate deathstimeaverage population size b Probability of dying deathstime alive at beginning of period Life expectancy years to live for each age class Survival Sx surviving between ages x and xl Survivorship lx probability of survival over many age intervals Fecundity bx female offspring per age interval 2 Survivorship curves type I II III 3 Life Tables a Current population structure b Projected to next interval c Projected through time d Population growth rate Wop0 Lecture 15 Community Structure Goals Understand the difference in the con icting views of how communities are structured Understand the difference and how to test for closed and open community structure Know the different methods ecologists use to measure community structure Be able to use the Simpson and ShannonWiener indexes to measure diversity Understand how organisms are organized into food webs Be able to explain the different kinds of food web models Understand what is meant by bottomup and topdown controls on productivity Outline Overview of interspecies interactions 7 herbivory predation competition mutualism Definition of community 1 Clement s view 7 Holistic approach 2 Gleason s view 7 Individualistic approach 3 Mixed viewpoint Closed vs open community concepts 1 Continuum concept 2 Gradient analysis 3 Testing for open or closed community structure Measures of community structure 1 Species richness 7 number of species in a given area Speciesarea curves 2 Relative abundance 7 proportion of each species in a given area 3 Diversity 7 index that uses both richness and relative abundance a Simpson s Index D lZpi b ShannonWiener Index H E p In pi 4 Number of trophic levels 7 number of different feeding types in a given area Food webs l Feeding relationships organize communities 2 3 types of food webs a Connectedness webs 7 feeding relationships only b Energy ow webs 7 connections quantified by energy ow c Functional webs 7 connections quantified by in uence on population growth 3 Topdown vs bottomup controls on productivity


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