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Day Trips:Available for both fifth and sixth-grade students, the day is spent on Madeline Island in search of the island's history, natural ecosystems, geological formation, and growth/development of the historic town of La Pointe. The day includes a ferry ride, visitation of the Madeline Island Historical Museum or Big Bay State Park, Grant's ...
[6] [7] The educator materials represent some of the best resources available by subject from the Ocean Portal's collaborators. The materials are available in the Educators' section, but also integrated throughout the site on species, ecosystem, and other subject pages. The educational materials can be filtered by grade, subject, and topic.
Terrestrial ecosystems occupy 55,660,000 mi 2 (144,150,000 km 2), or 28.26% of Earth's surface. [5] Major plant taxa in terrestrial ecosystems are members of the division Magnoliophyta (flowering plants), of which there are about 275,000 species, and the division Pinophyta (conifers), of which there are about 500 species.
The term "ecosystem" was first used in 1935 in a publication by British ecologist Arthur Tansley. The term was coined by Arthur Roy Clapham, who came up with the word at Tansley's request. [6] Tansley devised the concept to draw attention to the importance of transfers of materials between organisms and their environment.
The ecological efficiency of an ecosystem is as a result often no better than an approximation. On the other hand, an approximation may be enough for most ecosystems, where it is important not to get an exact measure of efficiency, but rather a general idea of how energy is moving through its trophic levels .
Lentic ecosystems can be compared with lotic ecosystems, which involve flowing terrestrial waters such as rivers and streams. Together, these two ecosystems are examples of freshwater ecosystems. Lentic systems are diverse, ranging from a small, temporary rainwater pool a few inches deep to Lake Baikal, which has a maximum depth of 1642 m. [10]