Lect 2 Flashcards
Successful invasions
-whatisa n invasive species
one that says this place is great I’m going to reproduce and spread
Successful invasion
-life history attributes
- They analyzed a bunch of plants and animals and they said “what are the life history attributes that make them good at invading”
- Life history attributes are things like “do you have big children”
Successful invasion
-life hist attriubtes..what they found
What they found is that nothing dits well. Its really hard to predict who is going to take
Successful invasion
-propagual pressure
Turned out to take well
Successful invasion
-propagule population
Even if you have really well traits and you could take over, you still cant get over the small problems in your population. It means you are constantly introducing that species. For ex we know the invasive trees,that are here and established have been brought over by the hundreds. If we brought over one or two they probably wouldn’t make it
Successful invasion
-acclamation societies
There were acclamation societies that were largely responsible for bringing invasive trees over
Synanthropic species
species associated with humans. They live on human dwellings
Characteristics of invaded communities
- You have a climate similar to origin of invaders
- Few species
- Disturbance
Characteristics of invaded communities
-You have a climate similar to origin of invaders
-We don’t expect to be invaded by penguins
-For Pennsylvania, our similar climates would be Europe, Japan, Central China and England
-When you see (sin) in species names, that means from China
(Japensus) means from Japan
Characteristics of invaded communities
-few species
- Examples would be islands.
- —2/3 of the plants in Hawaii are not from there
- Empty niches?
- —Have open spots for species to move in to
- -Big argument in ecology
Characteristics of invaded communities
-disturbance
- On a finer scale, many invasive species are associated with disturbance
- If you have disturbance, you burn a habitat and invasive species will move in there
- —-Things like railroad tracks. They are really good ways for invasive species to get around
How species are introduced to certain areas
- Ship ballasts
2 Trains cars and airplanes are bad too
- Most agricultural pests are introduced
- Invasive nematodes are bad for agriculture
Ship ballasts
- Ships are made to be a certain height in the water. They can get this height in two ways
1. Put alot or crap on them. Cars for example. It pushes the ship down to where its optimum height is
2. It takes water on that weighs it down and keeps it stable - If you are going to china and you have ship ballasts, now they put junk on you and putting even more weight on, so you have to dump the ship ballasts
- Zebra mussels probably came in ship ballasts from the great lakes
Trains cars and airplanes are bad too
On airplanes its the people on it
They carry seeds. For example an apple with a maggot
Biotic resistance hypoth
- The flip to the species poor habitat. Species poor habitats can be invaded, but does that mean species rich habitats can not be?
- If you have little disturbance you have few invasive species. The question is why
