Population Growth of Lemna gibba
Density-dependence occurs when the population growth rate changes casually with population
size, (N), or density while density-independence shows the change of the population growth r
Populus 4: Predation
After completing this exercise on the Lotka-Volterra model of predator-prey population
dynamics, be able to:
Explain the models parameters and assumptions.
Explain how the model relates to simpler models of the growth of indi
The curve shows the per-capita growth rate of prey is density-independent.
dN/dt = r1N c1NP = r1N (because predator = 0)
dN/dt = r1N Density-independent equation.
dN/Ndt vs. N would look like this graph. There is not intercept with x-ax
R* is a resource level which represents zero net growth isoclines and the R value in which per
capita growth rate and its mortality rate are intercepted.
N* is the population density from the R*.
Zero net Growth isocline, ZNGI, is the isocline along w
letters to nature
Release of invasive plants from
fungal and viral pathogens
Charles E. Mitchell & Alison G. Power
Department of Ecology and Evolutionary Biology, Cornell University, Ithaca,
New York 14853, USA
Invasive plant species both threaten n
Populus : Lotka-Volterra Competition
1a.In lecture, we introduced to you the concept of zero-growth isoclines. Use your own words to explain
what a zero-growth isocline is, as used in the Lotka-Volterra competition model (2pt).
Guide to JMP 1: Entering Data, Graphing Data, and Making Linear/Special Fits
After opening JMP, navigate to File > New > Data Table to bring up a data table for data entry:
This is what your new Data Table will look like:
Lotka-Volterra Competition: How to Calculate Competition Coefficients
Note: this section is not required for the lab exercises, but it will be useful especially to those doing
competition experiments for the research projects and to better understand Lotk
NATURE|Vol 451|17 January 2008|doi:10.1038/nature06592
YEAR OF PLANET EARTH F EATURE
An Earth-system perspective of
the global nitrogen cycle
Nicolas Gruber & James N. Galloway
With humans having an increasing impact on the planet, the interactions betwee
Fall 2012 Biol 3407/5407 - Ecology
Tentative Schedule of Laboratory/Discussion Activities
Note: Your lab period will usually begin or end with about an hour of
Also note the journal articles for discussion may be changed from those l
Guide to JMP 2: Introduction to Data Analysis with ANOVA and regression
After you have entered your data into jump (either by hand, copy/paste from excel, or opening a
JMP data file), navigate to Analyze > Fit Model:
How to access library journal article subscriptions from home:
1) Navigate to the library home page: www.lib.umn.edu and log in
2) Once logged in, you can access University journal databases, as well as journal articles
on Google Scholar. To g
(1) Difference between morning and afternoon would affect to the abundance of insects.
(2) Sunny and rainy weather would affect to the abundance of insects.
(3) Diversity of the plants covered 75% would affect to the diversity of
Week 2: How does habitat affect the distribution,
abundance and diversity of invertebrates?
NOTE: You must come to lab prepared to spend the lab period outside, no matter what the
weather may be. Wear appropriate clothing and footwear, and be prepared for
Independent Research Project
Biology 3407/5407: Ecology
1) Formulate a hypothesis relevant to emerging questions in ecology
2) Design and carry out an experiment or observational study, or find existing data, to
test this hypothesis
Growth response of Lemna gibba L. (duckweed) to
copper and nickel phytoaccumulation
Effet de laccumulation de Cu et Ni sur la croissance de
Lemna gibba L. (lentilles deau)
N. Khellaf, M. Zerdaoui
Laboratory of Environmental Engineering, Facu
A review of continuous exponential versus continuous logistic growth
Continuous exponential growth models
-use exponential growth models when growth is density independent (infinite space, infinite resources)
-Equation for predicting po