. Animal communities in temperate America, as illustrated in the Chicago region ; a study in animal ecology. Animal ecology; Zoology. SUMMARY 81 abundant and evenly distributed throughout the deep-water belt. The principal invertebrates are Pontoporeia hoyi, Mysis relicta, water-mites, midge larvae, and a species of Pisidium. The fish, however, show some noteworthy peculiarities of distribution. The lake trout rarely leaves this belt, except during the breeding season. The blackfin {Argyrosomus nigripinnis) is below 70 meters, except in December, when it has been recorded in 60 meters. Hoy's w
. Animal communities in temperate America, as illustrated in the Chicago region ; a study in animal ecology. Animal ecology; Zoology. SUMMARY 81 abundant and evenly distributed throughout the deep-water belt. The principal invertebrates are Pontoporeia hoyi, Mysis relicta, water-mites, midge larvae, and a species of Pisidium. The fish, however, show some noteworthy peculiarities of distribution. The lake trout rarely leaves this belt, except during the breeding season. The blackfin {Argyrosomus nigripinnis) is below 70 meters, except in December, when it has been recorded in 60 meters. Hoy's whitefish. Representative Crustaceans of the Deep-Water Community of Lake Michigan Fig. 22.—A schizopod {Mysis relicta); enlarged as indicated (after Smith). Fig. 23.—An amphipod {Pontoporeia hoyi) (after Smith). {Argyrosomus hoyi) is rare, and Triglopsis thompsoni has not been recorded above 115 meters; all accordingly live under uniform condi- tions—no day, no night, no seasons. III. Summary The available data on the conditions and life in the lake are of such a nature as to justify few conclusions of weight. We find only hints here and there which may be useful to those who shall investigate the lake in the future. I. Bottom forms are the most abundant on the open shores which are rocky, and which form good substrata for the attachment of algae and the holdfast organs of Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Shelford, Victor E. (Victor Ernest), b. 1877; Metcalf Collection (North Carolina State University). NCRS. Chicago, Ill. , Pub. for the Geographic Society of Chicago by the University of Chicago Press
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectzoology, bookyear1913
