I Have Already Contrasted The
Climate As Well As The General Appearance Of Tierra Del
Fuego With That Of Patagonia; And The Difference Is Strongly
Exemplified In The Entomology.
I do not believe they have
one species in common; certainly the general character of the
insects is widely different.
If we turn from the land to the sea, we shall find the latter
as abundantly stocked with living creatures as the former is
poorly so. In all parts of the world a rocky and partially
protected shore perhaps supports, in a given space, a greater
number of individual animals than any other station. There
is one marine production which, from its importance, is
worthy of a particular history. It is the kelp, or Macrocystis
pyrifera. This plant grows on every rock from low-water
mark to a great depth, both on the outer coast and within the
channels. [6] I believe, during the voyages of the Adventure
and Beagle, not one rock near the surface was discovered
which was not buoyed by this floating weed. The good service
it thus affords to vessels navigating near this stormy
land is evident; and it certainly has saved many a one from
being wrecked. I know few things more surprising than to
see this plant growing and flourishing amidst those great
breakers of the western ocean, which no mass of rock, let it
be ever so hard, can long resist. The stem is round, slimy,
and smooth, and seldom has a diameter of so much as an
inch. A few taken together are sufficiently strong to support
the weight of the large loose stones, to which in the inland
channels they grow attached; and yet some of these stones
were so heavy that when drawn to the surface, they could
scarcely be lifted into a boat by one person. Captain Cook,
in his second voyage, says, that this plant at Kerguelen Land
rises from a greater depth than twenty-four fathoms; "and
as it does not grow in a perpendicular direction, but makes a
very acute angle with the bottom, and much of it afterwards
spreads many fathoms on the surface of the sea, I am well
warranted to say that some of it grows to the length of sixty
fathoms and upwards." I do not suppose the stem of any
other plant attains so great a length as three hundred and
sixty feet, as stated by Captain Cook. Captain Fitz Roy,
moreover, found it growing [7] up from the greater depth of
forty-five fathoms. The beds of this sea-weed, even when
of not great breadth, make excellent natural floating
breakwaters. It is quite curious to see, in an exposed harbour,
how soon the waves from the open sea, as they travel through
the straggling stems, sink in height, and pass into smooth
water.
The number of living creatures of all Orders, whose existence
intimately depends on the kelp, is wonderful. A great
volume might be written, describing the inhabitants of one
of these beds of sea-weed.
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