. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. SAND-GRAVa BOTTOM OR POOL COMMUNITY 0 10 20 30 40 50 60 70 80 90 100. 0 1( ) 2 ) 3 ) 4 3 3 5( ) 6 ) 7 ) 8 i 'i 3 IOC ETHEOSTOMA y_- v. -'. ,.• .•//. ...-' /;•/ ~v, L. m CAMBARUS •','.-'. •;./;. ••'/.'.• ;:;>' '/•''i 0tt $& GONIOBASIS :i: il; ii : lil ,'; ED ilJ $?• HYDROPSYCHE ^:: -I1V •--ir. . T.'.V: £rX:. -:-:=.: :'::: '•I-.:: T77 VTff -l-v, '.po ^p a HEPTAGENINAE =.--. *_'.v .-:.-- -:~::: — V- •=M :'.:'• nil PSEPHENUS '.' ::.v :.:. ..--. ::_-r. -". 1 • ; 0 10 20 30 40 32 50 60 70
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. SAND-GRAVa BOTTOM OR POOL COMMUNITY 0 10 20 30 40 50 60 70 80 90 100. 0 1( ) 2 ) 3 ) 4 3 3 5( ) 6 ) 7 ) 8 i 'i 3 IOC ETHEOSTOMA y_- v. -'. ,.• .•//. ...-' /;•/ ~v, L. m CAMBARUS •','.-'. •;./;. ••'/.'.• ;:;>' '/•''i 0tt $& GONIOBASIS :i: il; ii : lil ,'; ED ilJ $?• HYDROPSYCHE ^:: -I1V •--ir. . T.'.V: £rX:. -:-:=.: :'::: '•I-.:: T77 VTff -l-v, '.po ^p a HEPTAGENINAE =.--. *_'.v .-:.-- -:~::: — V- •=M :'.:'• nil PSEPHENUS '.' ::.v :.:. ..--. ::_-r. -". 1 • ; 0 10 20 30 40 32 50 60 70 80 90 100 SAND-GRAVEL BOTTOM BREEDER SAND-GRAVEL BOTTOM BREEDER SAND-GRAVEL BOTTOM BREEDER 33 SAND j AMONG STONES MUD 34 ON STONES NOTROPIS HYBOPSIS AMBLOPLITES CALOPTERYX CAMPELOMA MACROMIA ANODONTUIDES SPHAERIUM NOTROPIS HYBOPSIS AMBLOPLITES CALOPTERYX CAMPECOMft MACROMIA ANODONTOIDE? m j| SPHAERIUM ROCK SAND TTT;T| UNDER STONES BURROWING HARD BOTTOM ^H NEGATIVE TO STONES FIGS. 31-34. Show the reactions to hard vs. sand bottom and to loose stonet> vs. wax bottom in per cent, of total. Fig. 31 shows the per cent, of rapids animals on sand and hard bottom, a large preference for the latter being evident. In the case of the pool fishes results of the experiments were unsatisfactory and as further tests had to be abandoned on account of cold weather the data of Forbes and Richardson ('08) is included to indicate what the probable results of experimenta- tion will be. It will be noted that the preference is quite generally for sand, rock and mud occupying a much smaller portion than sand. Fig. 33 shows the relation to rocks on a. wax bottom. Negative reaction to rocks is small. A striking agree- ment is shown in the general preference for stones. Fig. 34 shows the relation of the animals of the pool community to sand bottom with reference to burrowing. Here again the breeding data of the fish is taken from literature to indicate what might be fo
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
