SOME HABITAT RESPONSES OF THE LARGE 

 WATER-STRIDER, GERRIS REMIOIS 

 SAY. II 



('. F. (TKTrS Kir.EV 



IV. Description of and Experiments in C^onnection 

 WITH Brook Habitat at Syracuse 

 1. Description of Habitat. — Some further experimen- 

 tal work, much like that which previously has been con- 

 sidered, was done near a small, rapid stream (Figs. 4, 5), 

 approximately 4.5 miles southwest of Syracuse, New 



York, in the late summer of 1918. The stream flows in an 



easterly direction, into Onondaga Creek, its source being 



a spring ii 



I the hills, forming the western side of Onon- 



daga XixWi 



^y. Water-striders, Gerris remigis, are com- 





rtaiii situations on the surface of this brook 





i). The water in tiio stream is clear, and its 



channel a 



)nlaiiis silt, ,i;ravL'l, small and large rocks. 



TIkmv i> li 



ittlc i-ootcd a<iuatic vegetation growing along 



the oivat,. 



r pari of its course. At certain places the 





• liiitc iai)id, but even at those points where it 





. there are small areas of quieter water, pro- 



tecti-d by 



rocks, or points of land jutting out into the 



stream. 1 



n such situations (Fig. 4) are found water- 



stridcrs. s 



iiiuly and in small groups of two, three, or 



four iudivi 



(hials. Occasionally there is a short reacii of 





t(>r, sornetinios ])rotoctod by ti-ees (Fig. 5), on 



th.- siii-fac. 



' of which watei--st riders are found in small 









.•ii-ts hv the decavin- ti'nnk of a lar-e faheii 



tree. Cha 



n, -rows rankly and in ureat mats in the pooh 



On its surf 



ace water-striders li\e in large numbers (Fig. 



