15.04.2008
An Animal Invasion
Whether they arrive as stowaways aboard ships, are abandoned from aquariums, or even deliberately introduced, more and more foreign animal species are arriving in German waterways from around the world. The result is that exotic animals that have almost no natural enemies are threatening native species. Researchers are studying this phenomenon, taking Lake Constance as an example to find out how the ecosystem is affected by the new arrivals.
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An Animal Invasion: Episode 07, 27/05/2008
Dangerous Coexistence
Today, John and Stefan are going out to the experimental plots for the second time, to take stock of the native shrimp and the invaders half way through the experiment. Will the birds have eaten the mussels that provide the habitat for the shrimp? Soon they have the answer in writing: The hungry killer shrimp have moved from the open areas into the cages, where there are a lot of mussels. This raises new questions for John and Stefan: How do the two species of shrimp manage to coexist in such a small space? Can the native species survive the invasion?
At a glance
Field of Research:
Biology, Botany, Ecology, Geosciences, Limnology, Ornithology
Location:
Lake Constance
Episodes:
12
Season/Year:
1. Season/ 2008
Status:
Finished
Topics:
experimental plots, coexistence, take stock, native, shrimp
22.04.2008
Scientific Diving
The experiment begins. Today John Hesselschwerdt and Stefan Werner are going to position experimental cages on the lake bed.
29.04.2008
The Status Quo
The researchers heave hundreds of kilos of equipment, including diving gear, tubes, buckets and an underwater suction sampler, onto their research boat. Today they want to find out how many mussels and shrimp currently live in Lake Constance....
06.05.2008
Washing Up for Science
The first stage was successful: The samples that the researchers brought back from their dive are densely populated with mussels, the preferred habitat of the killer shrimp. Now it’s time for the laborious work....
13.05.2008
Counting, Counting, Counting
Back in the lab the researchers have still got their work cut out. They need to evaluate the samples they collected, and that means counting.
20.05.2008
All for the Birds?
Coots, diving ducks and Dikerogammarus villosus share one thing in common: they all love zebra mussels. The more mussel eaters there are on Lake Constance, the faster the habitat for the "killer shrimp" shrinks.
27.05.2008
Dangerous Coexistence
Today, John and Stefan are going out to the experimental plots for the second time, to take stock of the native shrimp and the invaders half way through the experiment.
03.06.2008
Fleeing Into the Depths
Do the native freshwater shrimp stand a chance against the killer shrimp? If so, what is their survival strategy? John starts a new experiment.
10.06.2008
Remnants of the Past in Peril
As scientific divers, John and Stefan are also interested in the lake’s past. Today they are going to visit an archaeological dig at the Orkopf.
17.06.2008
Fighting the Current
It’s time for the final dive, and there are strong winds forecast for today. The researchers decide to risk it. Underwater there is a strong current; Stefan Werner and John Hesselschwerdt can barely hold their position....
24.06.2008
A Lost Cause?
Is the native freshwater shrimp doomed? Today the researchers are taking their final samples from the lake. The wind and the currents are ideal for the dive. They’re finished in an hour: all the samples have been collected....
01.07.2008
I Will Survive!
Who would have guessed: The native freshwater shrimp is able to outlive the killer shrimp. In addition to other factors, the bitterly cold water in Lake Constance causes the invasive killer shrimp to lose its appetite....
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