propagule pressure tory white, bri habel, sarah ryan, anna sheinaus
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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
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