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A BWCA Glossary
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- Ichthyoplankton
- Freshwater plankton made up of fish eggs,
newly hatched eggs (fry), young fish, and adults of small fish. From
the Greek, icqus
(ichthys), "fish".
- Icterid
- Any of the New World birds of the family Icteridæ,
the Blackbirds and Orioles. Represented in the North Country by
three blackbirds, the Red Winged Blackbird (Agelaius phoeniceus),
Rusty Blackbird (Euphagus carolinus), and Common Grackle (Quiscalus
quiscula), and a feathered nest parasite, the Brown Headed Cowbird
(Molothrus ater).
- Igneous
- Any rock solidified from molten or partly molten material. BWCA basalt,
gabbro, and granite
are of igneous origin.
- Indusium
- On a fern, the protective covering for the Sorus,
the cluster of spore producing Sporangia.
Not present in all species.
- Inflorescence
- The group or arrangement in which flowers are borne on a plant; the
floral structure.
- Insectivore
- Animal whose diet is made up primarily of insects and other invertebrates.
In northern bogs, the insectivores include some plants.
- Instar
- The stage in an insect's life history between any two moults. A newly-hatched
insect which has not yet moulted is said to be a first-instar nymph
or larva. The adult is the final instar.
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- Internode
- The portion of a stem between two successive nodes, the gap between
successive points of attachment of leaves on a stem.
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- Interrupted
- Discontinuous; in an inflorescence,
having clusters of flowers interspersed with bare areas of stem; in
the Interrupted Fern (Osmunda
claytonia), having the non-fertile frond broken by the interspersion
of the fertile organs.
- Interstadial
- The lengthy period of warm temperatures between ice ages. Some
geologists suspect that we may, in our time, be living in the interstadial
which will precede the fifth ice age.
- Intrusive
- Igneous rock formed beneath the surface of the Earth; typically with
large crystals due to slow cooling. Also known as plutonic; opposite
of extrusive or volcanic.
- Involucre
- A whorl of bracts located beneath (subtending) a flower cluster,
as in the heads of members of the sunflower family (Asteraceae).
- Isinglass
- A form of gelatin prepared from the inner lining of the air bladders
of fishes, including, at one time, the Lake Sturgeon (Acipenser
fulvescens). Sometimes used as a clarifying agent in jellies,
glues, wines, and home brew, as well as in the isinglass windows of
carriages and early cars.
- Island Arc
- The belief, supported by geological evidence, that the Superior
Uplands were, in Precambrian
times, an arc of offshore islands.
- Izaak Walton League
- Minnesota IWLA involvement
with the BWCA began in the 1920’s, and has continued to this day.
Minnesota Division members, particularly Miron “Bud” Heinselman, were
key players in the arduous battle to preserve the Boundary Waters for
future generations. The
Compleat Angler (full e-text of Izaak Walton's classic).
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Last Updated on
11 April, 2004
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