..The fishes of Illinois . o itsenvironment that members of adjacent communities can not success-fully intrude upon its territory. 7. An analysis of our statistical data of ecological distributiongives us many instances of a marked difference in preference ofsituation between nearly related species inhabiting the same area,the effect of which is to break the force of a competition betweenthese species such as would prevail if they were similarly distrib-uted ecologically as well as geographically. Closely related speciesare, as a consequence, often found much less frequently associatedin their
..The fishes of Illinois . o itsenvironment that members of adjacent communities can not success-fully intrude upon its territory. 7. An analysis of our statistical data of ecological distributiongives us many instances of a marked difference in preference ofsituation between nearly related species inhabiting the same area,the effect of which is to break the force of a competition betweenthese species such as would prevail if they were similarly distrib-uted ecologically as well as geographically. Closely related speciesare, as a consequence, often found much less frequently associatedin their common territory than either is with widely unlike speciesof the same geographical range. Exceptions to this rule are foundwhere similar species occupy adjacent areas of distribution whichmerely overlap by their borders. 8. A table of the broader ecological relations of 97 species ofIllinois fishes is made the basis of a few general statements, butthat subject as a whole is reserved for more detailed treatment 3 ho C ?3
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Keywords: ., bookcentury1900, bookdecade1900, bookidcu31924, booksubjectfishes
