DISTRIBUTION IN TIME AND ,…{SPACE
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It is generallybelieved that the Salmon family came to
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Europe from the west and not.0m the east
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The
Salmon is an arctic and subarçticgenus that haS its centre
in the Northern Pacic, Where four tove species occur
the rivers of Asia.
These are
coasts of Canada-and the States_:and one‘
_
up long distances into the land.
,
In : this
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,
salar of Europe probably crossed the Arneriean_eontinent
;,
before the great rolling together of the ;Rockies took place
in the Tertiary period, andbefdre
rated from America.
The Trout is probably a derivative
Which has adapted itself more
to the riversgand
lakes.
It is of interest to noté, -thatthe small Trout trans—5
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,
plantedä—to NeW Zealand ri've'rè have becomealmost as large
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as the Salmon.
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,
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If we now glance back oVer this brief summary of the
distribution of shes in the past and present, We Canth
Î
fail to be Struck by the many and great changes Which have ,
_
occurred…- _Thé endeaV0ur has; been
these
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*L
,
the, _cotinnth
fgn thnunf t:; 1
3=:;i
î
-
water
‘In<î_ian… 0Cean and
lands
“
”it owe
Weahh0f f’fofrmsèjusÏt ‘?c'bÇtliçîgî L'ij,‘ê
; -
ComparatiVe absence of these physrcal changes Whichhave
__
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Â
blotted out from time to time
the globe. But the main thing is,_that
{-i
_
blotted out or depleted, its place was taken by anothëf
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coming from the pelagio stock of the sea. Here the Clupeaf - '
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tribe, under various names, has reigned from the beginning
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With“ but
alteration in its structure and
Î,
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none in its form. It has been preyed upon by its descendaÿëfl _‘ —
and. other animals_ir‘1 the most ruthless
_…_' …. _
»
coniparisôp__wii anything” known elsewhere,yet1tpers15ts “__;…
:
in all
_"Ÿ ;
,
variety-and
f ;
havecomeprobablyfï0fû 1l—tS
.
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to
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