An increasing trend in TSI values over a period of several years may indicate a degradation of the health of a lake.

This efficiency is never high. Protect, identify, evaluate, and monitor manatee habitats. Our editors will review what you’ve submitted and determine whether to revise the article. Terrestrial herbivores tend to be larger since most terrestrial plants are large and can sustain a large herbivore.

Lakes with TSI values ranging between 46 and 70 are considered to be waterbodies with good or sufficient nutrients and have fairly high productivity; they have a greater amount of nutrients and are able to support an abundance of algae, aquatic plants, birds, fish, insects and other wildlife.

At the third level, primary carnivores, or meat eaters, eat the herbivores; and at the fourth level, secondary carnivores eat the primary carnivores.

Classifications range from 1 to 100 and are generally described as follows: An excellent source of information about trophic states of Florida Lakes is the Florida LAKEWATCH Circular–Trophic State: A Waterbody's Ability to Support Plants, Fish and Wildlife. There are two major threats: loss of habitat and collisions with boats and ships. From above the water's surface, the animal's nose and nostrils are often the only thing visible.

The plants or their products are consumed by the second-level organisms—the herbivores, or plant eaters. The Trophic State Index is one of several methods used to describe the biological productivity of a waterbody.

They can use their flippers to dig up plants and use their upper lip to manipulate leaves of plants for feeding. Manatees may travel hundreds of miles during a year’s time, preferring to travel along channels and shorelines. The West Indian manatee has no natural predators.

At the third level, primary carnivores, or meat eaters, eat the herbivores; and at the fourth level, secondary carnivores eat the primary carnivores.

This method of determining TSI is the official “Florida TSI Method”. They have little tolerance for cold water because of their low metabolism and lack of insulating body fat. Sailors once mistook manatees for mermaids. The two share many traits in common. In a food chain or food pyramid, the first trophic level belongs to the autotrophs. Primary threats to the West Indian manatee include habitat loss and fragmentation, entanglements in fishing gear, collisions with boats, and others.

The goal of the manatee rescue and rehabilitation program is to treat sick and injured manatees and release them back into the wild.

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