n><span class="co">#&gt;   Wood_instream_debris Bank_vegetation Macrophytes_algae Macrophytes Cobbles</span></span>
<span><span class="co">#&gt; 1                   NA              NA                NA          NA      NA</span></span>
<span><span class="co">#&gt; 2                   NA              NA                NA          NA      NA</span></span>
<span><span class="co">#&gt; 3                   NA              NA                NA          NA      NA</span></span>
<span><span class="co">#&gt; 4      