By Siebrecht van der Spoel, Robert Pieter Heyman (auth.)
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Extra resources for A Comparative Atlas of Zooplankton: Biological Patterns in the Oceans
The frequent sympatry makes it, moreover, very doubtful ifthe forms in the species S. affine are indeed forms instead of genetically isolated species or semispecies. elongatum (hatched). F I G. 66 Distribution of Stylocheiron longicorne and S. indicus. longicorne 'N. indicus. 67 Distribution ofthe Stylocheiron affine group. Equatorial form'. d+H~"--"" 0 ~~~~~~~~~~20 ~--+-~~~~+--4--~--+-~--~--+--+--~--r-~--~--r--+--~--r-~60 ~~~~~~~~-4--~--+--+--~--r--+--~--~-+--~~~r--+--~--r-~80 ~~~DO~~~~~od~~du~~oU~~~~~~~~~S 53 Boundaries and barriers Though their numbers are few in the oceans, so me isolating barriers can be indicated; the continents, divergences and convergences are the most clear-cut ones.
In the ocean, however, isolation by barriers, or distances, is rare, and so discontinuous variation is not frequently found. Only taxa restricted to the Tropical belt (2S 0N-2S OS) encounter the isolating influences of continents. g. between bipolar taxa and between taxa restricted to the east and west sides of an ocean. The populations separated by isolation usually first develop into subspecies. When isolation is absent or weak, dissimilarities between populations mayaIso develop; in this case it is the difference in selective press ure in various parts of the Distribution of Phronima sedentaria.
R: ä. Q) "0 1000- 2000- The profiles for the three oceans are roughly identical, only the Indian Ocean lacks cold intluences in the north (fig. 30). A deepening of the isotherms in the north is due to outtlow from the Red Sea and the Persian Gulf. Temperature profile of the Indian Oeean, isotherms with 1°C interval. F I G. 1%0 Sinterval. F I G. 32 Profile ofthe Indian Oeean giving the division into water masses (for explanation see fig. 29). F I G. 30 These outtlows are more prominently retlected by the salinity profile (fig.
A Comparative Atlas of Zooplankton: Biological Patterns in the Oceans by Siebrecht van der Spoel, Robert Pieter Heyman (auth.)