ECOLOGICAL SUCCESSK >N . 



ment of the question before us, after which we shall di^eu tin- 

 available data with reference to the relations of fn-h to the dif- 

 ferent ponds, from the standpoint of their area, their depth, 

 mineral- and gases in solution and finally the available food for 

 youn.u and adults. Competition, living pla<v and breeding place 

 (A the li-h will be discussed as fully as data will permit. 



TABLE XXI. 



iM-lklhi IIOX OF THE FlSH AND THEIR R KI.A Tl> >N To Hull 



I In- li-tt'-r- .iiul numbers at the heads of the column-; n-tVr tn the various isnlati-il 

 parts ol pon ; indicates the presence of the species; !' that vi-ry young 



nii-n wi-ri- I'linul in numbers and the >; :<! in looc;, in <ir n. The 



ii'iiiifii' l.itun- .tii'l bottom preference data a: : i.ud-on. 







Name. 



in.. ml.' ' ' TMS 



'l.i . -ides. ... B 



{ill fnlliJus B 



Blue-spotted 



-mi li-li .us H 



Pumpkin iced '.-'tis 



... H 

 \\.iiinouili I :$ 



B 



I 



b 



( In. 



bullhead. 



I ad 



rel 



Mini ininn... 

 i i. >l<l<-n -hincr. 



\i-ll..\\ hllllh 



HI.., k bullh.-.i-l 



: escens . 

 i micella 



us 



Its 







niiiitatiis 



mi 



:iCilS . . . 



natalis 

 i . mrlas . 





Mud. 

 r. i< . k an I sand. In ; 



H B |... 



In part, linn k 



B B . . . Mini .in-1 -.in. I. 

 B B ... . 

 B B . . . Mud vAI>l...u I. Mu. k pi. 



B B Mud. 



* ... 

 B B " 



Tin- pmbli-m of the causes of sun v ion max In- -tau-d in tuo 

 \\ a \ 3 : 



liiM'Kin- interpretation: \\li\ are the piniieer ti-he- of 

 a (mud -ncrci .led as the pond ",r"\\- older, by ti>lle^ of dilteiciil 



habits? 



I in le pendent ol interpret a ti< m : \\ hy are tin- ti-he- ot pond 

 I. noi in the older ponds and the ti>he- ol the older |>oiid- not 

 in pond I .. u hen the channels between I hem ha\ e been o j ic' n until 

 the paM leu \ 



