This great mallard habitat on Sherman Island is no more.
Our duck club, on Sherman Island in the California Delta, was some of the greatest seasonal marsh on earth. In winter, ducks, geese, shore birds, raptors, river otters, beavers, muskrats and many more critters thrived in that habitat.
It was great hunting.
After the California Department of Water Resources purchased the duck club from us, we continued to manage the property as a seasonal marsh. Then California decided that the property needed to be turned into a conservation experiment.
The primary goals were to reduce subsidence and sequester carbon. This was a prototype project. Unfortunately, the goals of the experiment conflicted with the existing use.
In order to test the hypothesis, the existing seasonal marsh would have to be replaced by permanent ponds.
Our Sherman Island duck club was converted from seasonal to permanent marsh. It is no longer managed for waterfowl.
Having sold the property to the State, we were in no position to oppose the program. The rest is history. Although ducks and geese still migrate to Sherman Island, they avoid the permanent marsh in favor of the remaining shallow-flooded pasture that surrounds the property we used to own.
It’s easy to see the effects to waterfowl when you observe our property. It’s more difficult to quantify the effects this change had on the California waterfowl population, but when combined with other similar projects, it could be substantial. We’ll never know.
This was a situation where one form of conservation conflicted directly with another.
Conservation comes in many forms and we see conservation activities frequently, but underlying conflicts are usually invisible except to specialists who manage wildlife or wildlife habitat.
Ongoing are changes to wildlife preserves and refuges on public lands. Where lands are dedicated simply to wildlife, there is competition between thriving species and threatened species. Should endangered or threatened status always trump thriving or common?
Where land is purchased for and dedicated to a certain species or group of species, one would expect management of that land to be managed for that species. Is that always the case?
Take, for example, land purchased with Federal or State Duck Stamp money. Duck stamp funds are raised by our government agencies specifically to purchase habitat for migratory waterfowl. Hunters purchase these stamps with hopes that there will always be waterfowl to hunt.
California has a long list of threatened, endangered and special-concern plants and animals. What is the ultimate “trump” species? Can habitat for a threatened species displace waterfowl habitat on dedicated land?
Sometimes habitat is designed by the forces of nature. Other times man redesigns land to favor one species or another.
Habitat can be converted by applying water. Timing of the water application is crucial. When water floods fields in winter and is left to dry during the spring, the habitat favors migratory birds. When farmers use water to irrigate, farming can create food for many species including waterfowl.
When land is flooded and water covers the land during spring and/or summer, it is beneficial for numerous species and sometimes waterfowl can nest there, but usually not.
When land is permanently flooded, it favors primarily fish species but there is little food to attract waterfowl, especially dabbling ducks.
We must not kid ourselves about permanent marsh. It may attract golf course Canada geese, but it is not important to migratory waterfowl.
It would be nice to think that conservation always benefits all things, but it’s not that simple.