COMPARATIVE BODY MEASUREMENTS, FECUNDITY, OXYGEN-UPTAKE, AND AMMONIA EXCRETION IN CAMBARUS-ROBUSTUS (ASTACIDAE, CRUSTACEA) FROM AN ACIDIC AND A NEUTRAL SITE IN NORTHEASTERN ONTARIO, CANADA

Cambarus robustus (Astacidae, Crustacea) females from acidic, metal-co ntaminated Wavy Lake and circumneutral, uncontaminated, fast-flowing P ike Creek showed significant allometric differences (relationships bet ween total body length and wet mass, total body length and chela lengt h, and carapace length and carapace width), as well as differences in their fecundity (relationships between total body length and numbers o f eggs per ovary and numbers of eggs per ovary and diameter of eggs). Whereas crayfish from Pike Creek showed linear relationships between t otal body length, wet mass, and chela length (= isometry), decapods fr om Wavy Lake showed isometry only between total body length and chela length. Females from Pike Creek produced significantly more but smalle r ovarian eggs than did those from Wavy Lake. Oxygen consumption was s ignificantly lower and ammonia excretion significantly higher in crayf ish from Wavy Lake than in those from Pike Creek.