The size frequency and abundance of subtidal bloodworms (Glycera dibranchiata,ehlers) in Montsweag Bay,Woolwich-Wiscasset,Maine |
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| Authors: | Edwin P Creaser David A Clifford |
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| Institution: | 1. Maine Department of Marine Resources Research Laboratory, 04575, West Boothbay Harbor, Maine
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| Abstract: | A study was conducted in the subtidal portion of Montsweag Bay (Woolwich-Wiscasset, Maine) between the mean low water mark and 1.5 m depth, to determine the size composition, abundance, and monetary value of bloodworms (Glycera dibranchiata). Eight 1-m2 subplots were sampled in each of three regions of equal size with the aid of a compressed air lift apparatus. Bloodworms collected varied in length between 1 and 31 cm; the majority were smaller than commercial size (<12 cm). A mean length of 4.6±0.03 cm (95% confidence level) was reported for noncommercial size worms and 19.6±2.0 cm, (95% confidence level) for commercial worms. Although the numbers of bloodworms of all sizes collected in region 1 were significantly greater than the numbers collected from region 3, no significant differences among the numbers of commercial-sized bloodworms were found in subplots within the three regions. Estimates of the standing crop and value of commercial bloodworms present were derived from overall estimates of the numbers m?2 and the standard error at 95% confidence (1.04±0.58 worms), the subtidal area, and the 1971 and 1983 value of commercial worms. During 1971, the 6,059,040±3,379,080 commercial-sized bloodworms present were valued at $242,362.00±$135,163.00. At 1983 prices, the value of these worms would be from $363,542.00±$202,745.00 to $605,904.00±$337,908.00. Construction of a causeway, which created subtidal conditions where intertidal conditions formerly existed, apparently had no adverse effect upon the bloodworm population present. |
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