...Not oil, but algae. The stagnant, warm water of the La Crosse River flowage surrounding Myrick Park is a perfect breeding ground for several types of green algae. This decaying tree stump is submerged in about 4 feet of water covered with a layer of pond "scum."
Microscopic algae comprise most of the life forms in fresh water, and they are the most productive. This aquatic "green slime" generates approximately 70% of the oxygen in Earth's atmosphere!
While algae are a normal and essential part of a healthy river ecosystem, sometimes large masses are considered a kind of pollution. When there is too much phosphorus in the river, the algae proliferate excessively, and thereby place disproportionate pressure on the ecosystem. After algae die they decompose while floating on the surface. Even large clusters do not harm plants or animals (humans included), however, they return little benefit to the river and interfere with some recreation activities.
In extreme cases, the decomposition of the algae causes anoxia, which is an insufficiency of dissolved oxygen in the water. This phenomenon, which is fatal to sensitive species (such as those species of fish that happen to be sportfish), can occur in several areas of the river.
To reduce algae masses, phosphorus levels need to be decreased. Ways to do this include monitoring chemical/fertilizer run-off, conservation of natural plant species on the shore line, and safe boating practices.
Black Caps!
Tiny, juicy little black raspberries, also known as "black-caps" around these parts, grow wild along the edge of many of our woodland hiking trails. This year was a bumper crop! They do best in dappled sunlight on the edge of trails, woods, and often along railroad tracks. They can tolerate dry conditions, however, too much sun causes the small compact berries to dry up quickly. On the other hand, too much shade and moisture prevent abundant flowering in the spring and/or compromised flower buds.
Black-caps usually form in little cluster of 5 berries, with the center one ripening first, followed by the others within a day or so. By the way, black-caps, raspberries, and blackberries are all distant cousins of the rose family. Thorns are their give-away family trait.
Posted at 02:36 PM in Commentary, Nature: Flora & Fauna | Permalink | Comments (1) | TrackBack (0)
Reblog (0)