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3.7. Major ion composition (meq %) in reaches 10-50 of the <br />Colorado River. Na and K combined (K always less <br />than 1.5%) ..............................................34 <br />3.8. Major ion composition (meg y) in dilute dolomitic <br />tributaries of the Colorado River. Na and K combined <br />(K always less than 1%) .................................35 <br />3.9. Major ion composition of impure dolomitic (Nankoweap <br />and Havasu), sulfate (Paria and Kanab), and saline <br />sodium chloride (Little Colorado River) tributaries <br />of the Colorado River. Na and K combined (K always <br />less than 1.5%) .........................................36 <br />3.10. Mean molar dissolved inorganic nitrogen/soluble <br />reactive phosphate (N/P) ratios from Colorado <br />River Reaches (10 thru 50) and tributaries (11, <br />21, 22, 32, and 43-46) during 1984-86..* ..... e.9 ........ 40 <br />4.1. Species composition by reach from electrofishing <br />effort during April 1984 to May 1986. Native species <br />are identified by raised portions .......................49 <br />4.2. Species composition by reach from larval seining effort <br />during April 1984 to May 1986. Native species are <br />identified by raised portions ...........................50 <br />4.3. Species composition by reach from seining effort <br />during April 1984 to May 1986. Native species <br />are identified by raised portions... * ... * ............... 51 <br />4.4. Relative abundance of fish species captured by <br />electrofishing from April 1984 to May 1986. <br />R reach ........... .................................... 53 <br />k <br />-xiii-