<?xml version='1.0' encoding='utf-8'?>
<oai_dc:dc xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:oai_dc="http://www.openarchives.org/OAI/2.0/oai_dc/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.openarchives.org/OAI/2.0/oai_dc/ http://www.openarchives.org/OAI/2.0/oai_dc.xsd">
  <dc:creator>Donald W. Schloesser</dc:creator>
  <dc:date>1988</dc:date>
  <dc:description>&lt;p&gt;&lt;span&gt;Sampling of benthos at 166 stations in the lower two-thirds of the St. Marys River in 1974 and 1975 yielded a total of 9 mayfly and 20 caddisfly genera. Densities of mayflies (primarily the pollution sensitive&amp;nbsp;&lt;/span&gt;&lt;i&gt;Hexagenia&lt;/i&gt;&lt;span&gt;) ranged from 0 to more than 2,000/m&lt;/span&gt;&lt;sup&gt;2&lt;/sup&gt;&lt;span&gt;&amp;nbsp;and caddisflies (primarily&amp;nbsp;&lt;/span&gt;&lt;i&gt;Polycentropus&lt;/i&gt;&lt;span&gt;) from 0 to 744/m&lt;/span&gt;&lt;sup&gt;2&lt;/sup&gt;&lt;span&gt;&amp;nbsp;in individual samples. No mayflies were collected in a 20 km section of the river extending from below Sault Ste. Marie, Ontario, to the head of Lake George &amp;ndash; an area previously identified by the International Joint Commission as having been &amp;ldquo;degraded&amp;rdquo; by industrial wastes. In three sections of the river progressively farther downstream from the degraded section, the average numbers of mayfly nymphs increased from 36 to 264 to 457/m&lt;/span&gt;&lt;sup&gt;2&lt;/sup&gt;&lt;span&gt;; and in three other non-degraded sections of the river, the range was 127 to 341/m&lt;/span&gt;&lt;sup&gt;2&lt;/sup&gt;&lt;span&gt;. Densities of caddisfly larvae were low (4/m&lt;/span&gt;&lt;sup&gt;2&lt;/sup&gt;&lt;span&gt;) in the degraded section of the river that was devoid of mayflies and ranged from 7 to 1017m&lt;/span&gt;&lt;sup&gt;2&lt;/sup&gt;&lt;span&gt;&amp;nbsp;in non-degraded sections. Average densities for all stations combined were 220/m&lt;/span&gt;&lt;sup&gt;2&lt;/sup&gt;&lt;span&gt;&amp;nbsp;for mayflies and 34/m&lt;/span&gt;&lt;sup&gt;2&lt;/sup&gt;&lt;span&gt;&amp;nbsp;for caddisflies.&lt;/span&gt;&lt;/p&gt;</dc:description>
  <dc:format>application/pdf</dc:format>
  <dc:identifier>10.1016/S0380-1330(88)71551-8</dc:identifier>
  <dc:language>en</dc:language>
  <dc:publisher>Elsevier</dc:publisher>
  <dc:title>Zonation of mayfly nymphs and caddisfly larvae in the St. Marys River</dc:title>
  <dc:type>article</dc:type>
</oai_dc:dc>