Propagule Pressure Tory White, Bri Habel, Sarah Ryan, Anna Sheinaus.
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Transcript of Propagule Pressure Tory White, Bri Habel, Sarah Ryan, Anna Sheinaus.
Propagule Pressure
Tory White, Bri Habel, Sarah Ryan, Anna Sheinaus
Definitions
Propagule Pressure
Propagule Biases
Null Model
SummaryPropagule pressure...● Should be null model for
invasion studies● Is significantly associated with
invasiveness and invasibility● Can disconfirm interpretations
of invasion patterns
1- Invasion history/widespread2- Physiological tolerance3- Consumption efficiency4- Body size/ biomass5- Individual growth rate6- Life span/ generation time7- Generation success/ rate8- Seed Size
9- Reproductive output10- Length of growing/breeding season11- Hermaphroditic/ asexual reproduction12- Niche/ Habitat separation13- Effects of herbivores/ predators
0/1- Anthropogenic activity1- Disturbance2-Resource food availability or quality3- Light intensity4- Species richness or diversity5- Species abundance or density6- Effects of herbivores/ predators
:Contrasts that did not consider the potentiallyconfounding effects of propagule pressure
:Did measure propagule pressure
:Used propagule pressure as control
Example of Propagule BiasGlobally invasive birds tend to belong to just seven families
o ducks/geese, pheasants, other game species
Does this mean that those species have special characteristics that make them more successful for invasion?
Literature Review - Methods● Forward-tracing of our paper led to
441 papers
● We reviewed 20 papers
● Collected data: support/doesn’t support Colautti et al’s hypothesis; taxonomic group each paper focused on (if any)
Literature Review - Results
Agreeance: 19/20 Studies● -Aquatic/Terrestrial Plants, Freshwater Fish, Insects, Marine Fish,
Pathogens
Disagreeance: 1/20 Studies● -Birds● -Often due to lack of research or inconclusive results
Discussion
● Hypothesis well supported
● Applicable across almost all taxonomic groups; EXCEPT maybe birds
European StarlingSturnus vulgaris
An invasive bird in the US
http://ac.els-cdn.com/S0169534705000327/1-s2.0-S0169534705000327-main.pdf?_tid=1251fcce-5540-11e4-a2ee-00000aab0f6b&acdnat=1413469620_95a548b464d6743ba59391ebab738b8b http://www.esajournals.org/doi/abs/10.1890/05-0427http://www.annualreviews.org/doi/abs/10.1146/annurev.ecolsys.110308.120304http://onlinelibrary.wiley.com/doi/10.1111/j.1461-0248.2009.01418.x/pdfhttp://onlinelibrary.wiley.com/doi/10.1046/j.1523-1739.2003.02365.x/full
http://onlinelibrary.wiley.com/doi/10.1111/j.1472-4642.2008.00521.x/pdf PAB