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- Title
Growth potential and host mortality of the parasitic phase of the sea lamprey (Petromyzon marinus) in Lake Superior.
- Authors
Jorgensen, Jeffrey C.; Kitchell, James F.
- Abstract
Landlocked Lake Superior sea lampreys (Petromyzon marinus) cause a significant but uncertain amount of mortality on host species. We used a sea lamprey bioenergetics model to examine the scope of host sizes vulnerable to death as a consequence of sea lamprey feeding and incorporated the bimodal lake-ward migration of parasitic sea lampreys. At their peak feeding rate and maximum size (P = 1.0, proportion of maximum consumption), spring migrants were capable of killing lean lake trout (Salvelinus namaycush) hosts ≤ 2.0 kg, which was larger than fall migrants (1.8 kg). Spring migrants feeding on Pacific salmon (coho (Oncorhynchus kisutch), Chinook (Oncorhynchus tshawytscha), and steelhead (Oncorhynchus mykiss)) killed hosts ≤ 2.0 kg, but fall migrants killed hosts as large as 2.8 kg. Although there is no direct empirical evidence, bioenergetics modeling suggests that it is plausible that some of the largest sea lampreys in Lake Superior spent more than one summer as parasites. Two-summer parasites readily attained sizes of sea-run adult anadromous sea lampreys and killed hosts from 3 to >5.5 kg in size. The maximum upper limit number of 2-kg hosts killed by two-summer parasites was nearly twice that of one-summer parasites.
- Subjects
SEA lamprey; LAKES; MORTALITY; ANIMAL species; BIOENERGETICS
- Publication
Canadian Journal of Fisheries & Aquatic Sciences, 2005, Vol 62, Issue 10, p2343
- ISSN
0706-652X
- Publication type
Article
- DOI
10.1139/F05-144