At Sea
In the sea there are mysterious comings and goings, both
in space and time: the movements of migratory species, the
strange phenomenon of succession by which, in one and the
same area, one species appears in profusion, flourishes for
a time, and then dies out, only to have its place taken by
another and then another, like actors in a pageant passing
before our eyes. And there are other mysteries. The phenomenon
of "red tides" has been known from early days, recurring again
and again down to the present time - a phenomenon in which the
sea becomes discoloured because of the extraordinary multiplication
of some minute form, often a dinoflagellate, and in which there are
disastrous side effects in the shape of mass mortalities among fish
and some of the invertebrates. Then there is the problem of curious
and seemingly erratic movements of fish, into or away from certain
areas, often with sharp economic consequences. ...
In the discovery of the biological role played by the sea water
and all it contains, we may be about to reach an understanding
of these old mysteries. For now it is clear that in the sea
nothing lives to itself. The very water is altered, in its
chemical nature and in its capacity for influencing life
processes, by the fact that certain forms have lived within
it and have passed on to it new substances capable of inducing
far-reaching effects. So the present is linked with the past
and future, and each living thing with all that surrounds it.
From The Edge of the Sea by Rachel Carson (1952).
In CAP Newsletter (1998) 21(2):29
Pollen in the South Shetland Islands
David Campbell is a biologist who spent three field seasons, the
austral summers, in the South Shetland Islands. This remote archipelago
lies north of the Antarctic peninsula and south of Tierra del Fuego.
In the passage below, Campbell has found a piece of petrified wood as he
climbs down Flagstaff Mountain on King George Island. He reflects on
what this tells us about environmental changes in this region:
On the eastern shore of Admiralty Bay, at Cape Hennequin, there is a fossil
forest: 16-million-year-old fossil impressions of plants embedded in ripple-marked
and aqueous tuffs. These include leaves of several species of Nothofagus (tinged
brownish as if they had just fallen in the autumn wind), of the gymnosperm genus
Araucaria, of ferns, and of several unnamed flowering trees that drifted into a
fast-flowing stream and were rapidly smothered by sediments. My fossil, which so
eloquently depicts seasonality in its stone rings, is from this epoch, when
Admiralty Bay had a climate and flora nearly identical to those of Patagonia
today. Imagine: flowing rivers and warm, halcyon summers. Did the leaves of
this tree flutter in a wind that blew off a temperate sea? Did birds forage
in its boughs by day; did marsupials snuffle in its leaf litter by night?
Was its pollen dispersed by wind, or was it pollinated by long-vanished insects?
From The Crystal Desert: Summers in Antarctica, by David G. Campbell,
published by Houghton Mifflin Company, 1993, p. 51.
In CAP Newsletter (2002) 25(2):26