chr&gt;                  &lt;int&gt; &lt;chr&gt;          </span>
<span class="co">#&gt;  1      1984 urn:lsid:marine… 1984  Abra alba              14636 23.0           </span>
<span class="co">#&gt;  2      2009 urn:lsid:marine… 2009  Abra alba              14636 &lt;NA&gt;           </span>
<span class="co">#&gt;  3      2002 urn:lsid:marine… 2002  Abra alba              14636 &lt;NA&gt;           </span>
<span class="co">#&gt;  4      2002 urn:lsid:marine… 2002  Abra alba              14636 &lt;N