Top Tweets for #CompExamPrep
Fish compete for water temperature the same way they compete for food. Dominant individuals get first dibs on the best water temperature and keep subordinates out.
#InterferenceCompetition #ThermalNiche #MagnusonEtAl1979 #CompExamPrep
Trying to stop invasive species? Don’t go it alone. Your region is only as protected as the weakest policy of your neighbors.
#WeakestLink #StopTheInvaders #PetersAndLodge2009 #CompExamPrep
Policies are experiments; learn from them.
Be patient, experiment, make large changes, one at a time.
“Be idealistic about science and pragmatic about politics.”
#AdaptiveManagement #Lee1993 #CompExamPrep
How's this for a "natural" cycle? A new market for fish is discovered. Early on, it yields high returns. As more folks join, the average profit is reduced. Eventually it's no longer profitable, and the stock is depleted.
#TragedyOfTheCommons #PitcherAndHart1982 #CompExamPrep
A new invader is discovered in the Great Lakes every 6-7 months, the highest rate ever recorded for a freshwater ecosystem. The invasion rate is strongly correlated with shipping activity (1840-2003).
#StopTheSpread #Ricciardi2006 @EcoInvasions #CompExamPrep
Tracking annual changes in a population? Like annual abundance or mortality? It’s a good idea to explore how the annual estimates change as you repeatedly remove the last year of data. You may be missing a time trend.
#RetrospectiveAnalysis #BencePopDy #CompExamPrep
Trying to stop invaders? Remember to look for hidden pathways to good habitat. For example, have ships expel their ballast not just in deep water, but in deep water far from onshore currents.
#GreatLakes #CirculationModel #LodgeEtal2016 #CompExamPrep
Strike that balance between avoiding danger and probing to learn where the danger is. Initiate "drastic" experiments to learn how populations respond to management actions.
#ManagementDonut #NoPainNoGain #Walters1986 #CompExamPrep
We have long managed the risks associated with disease and the production of food and medicine, but we are only just beginning to manage the risks of invasive species.
#StopTheInvaders #LodgeEtal2016 #CompExamPrep
If Goldilocks created mathematical models, they would surely be neither too simple nor too complex, but juuuust right. #OptimalComplexity #Walters1986 #CompExamPrep
Why do so many things have a bell-shaped distribution? Because that's the distribution for averages, and "averages" of a sort are common. For example, the weight of an apple depends on (the average effects of) variety, water, nutrients, etc.
#CentralLimitTheorem #CompExamPrep
One in three vertebrate species is a freshwater animal.
1 in 3 !
Even though fresh water covers less than 1% of the Earth's surface.
Freshwater is a hotspot for biodiversity.
#KeepItFresh #CookeEtAl2013 #CompExamPrep
Faced with a complex web of transactions involved in maintaining a resource-based economy, it's easy for management agencies to focus on short term stability. But much can be learned by initiating deliberately experimental policies. #AdaptOrDie #Walters1986 #CompExamPrep
I knew the mean of a distribution had a physical equivalent (the center of gravity or balancing point), but I didn't know the variance did (the moment of inertia or how easy it would be to spin the distribution around its mean). Cool! #VarianceSpin #MoodEtAl1974 #CompExamPrep
Thinking of migrating? Don't wait until your habitat quality has declined too much. Ensure you and your offspring are strong enough for migration, and arrive early at your destination. #PreemptiveDeparture #CompExamPrep
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