Distribution of the Ribbon Leech in North Dakota
نویسنده
چکیده
The distribution of the ribbon leech, NepMlopsis obscwra, was examined in the Central Lowland and Missouri Coteau regions of North Dakota. The leech was found in 12 of3S ponds sampled during a two-year period. Leeches were trapped with throated metal cans and burlap sacks baited with frozen fish parts. Leech ocamence was positively correlated with maximum depth, mean conductivity, and percent littoral rock cover. Leech occurrence was not correlated with surface area or latiwde. Ponds containing N. obscwra were characterized by maximum depths greater than or equal to 1.0 m, mean conductivity values between 500 and 2300 uS/em', and some measurable littoral rock cover. Investiga tions concerning all life cycle anributes ofleech populations should be pursued in North Dakota to assist resource managers in establishing harvest policy for this important bait source.
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