Life in the Sea
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In our eReader you can find the full English version of the book. Read Life in the Sea Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book Life in the Sea
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Near an imaginary contour line drawn round the centre of distribution the rate of reproduction is just equal to the rate of destruction ; beyond this line the latter becomes the more powerful of the two, and the species becomes rarer and rarer in] THE FACTORS OF DISTRIBUTION 79 until it can no longer be found. The area within the contour line we may call the area of productive distribution, that without it, and including all parts of the sea where the species has occurred, we may call the area ...of nominal distribution. It is unable to maintain itself within the latter area unless it is recruited from the former one.
The individuals of a species may be carried far beyond their area of optimal distribution, for if pelagic larvae are produced they may be transported for considerable distances by currents. Thus the pelagic larvae of the crustacean Squilla may be found in St George's Channel but we have no record of the occurrence of the adult there. It probably reproduces only in the Biscay-Mediterranean waters and the larvae are carried to the north in the Gulf Stream drift.
What to read after Life in the Sea?
You can find similar books in the "Read Also" column, or choose other free books by James Johnstone to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Near an imaginary contour line drawn round the centre of distribution the rate of reproduction is just equal to the rate of destruction ; beyond this line the latter becomes the more powerful of the two, and the species becomes rarer and rarer in] THE FACTORS OF DISTRIBUTION 79 until it can no longer be found. The area within the contour line we may call the area of productive distribution, that without it, and including all parts of the sea where the species has occurred, we may call the area ...of nominal distribution. It is unable to maintain itself within the latter area unless it is recruited from the former one.
The individuals of a species may be carried far beyond their area of optimal distribution, for if pelagic larvae are produced they may be transported for considerable distances by currents. Thus the pelagic larvae of the crustacean Squilla may be found in St George's Channel but we have no record of the occurrence of the adult there. It probably reproduces only in the Biscay-Mediterranean waters and the larvae are carried to the north in the Gulf Stream drift.
What to read after Life in the Sea?
You can find similar books in the "Read Also" column, or choose other free books by James Johnstone to read onlineMoreLess
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