Effects of a candidate antifouling compound (medetomidine) on pheromone induced mate search in the amphipod Corophium volutator.
Environmental hazards associated with traditional, toxic antifouling coatings based on heavy metals calls for the development of alternative, environmentally acceptable antifouling compounds. Medetomidine ((+/-)-4-[1-(2,3-dimethylphenyl)ethyl]-1H-imidazole) is a candidate antifouling biocide which impedes settlement of barnacles in the nanomolar range. Prior to introducing novel biocides it is of great importance to consider potential effects on non-target organisms. This study is the first to investigate the effects of medetomidine on the amphipod Corophium volutator, specifically effects on male mate search behaviour. In a laboratory, Y-maze bioassay, C. volutator males were allowed to follow female pheromones after 24 h exposure to 0 (control), 0.01 and 0.1 microg mL(-1) medetomidine. We found that exposure to medetomidine at both concentrations significantly reduced pheromone induced mate search (by 42-71%), with fewer males crawling towards female odour. The results obtained indicate that medetomidine may impair the reproductive fitness of non-target crustaceans, an aspect that needs to be considered before further commercialisation.
Krång
Anna-Sara
AS
Department of Marine Ecology, Göteborg University, Kristineberg Marine Research Station, S-450 34 Fiskebäckskil, Sweden. a.s.krang@kmf.gu.se <a.s.krang@kmf.gu.se>
Dahlström
Mia
M
D033304:Amphipoda / Q000187:drug effects*; D000818:Animals; D020926:Medetomidine / Q000032:analysis / Q000633:toxicity*; D010575:Pesticides / Q000633:toxicity*; D012623:Seawater / Q000032:analysis; D012724:Sex Attractants / Q000502:physiology; D012726:Sexual Behavior, Animal / Q000187:drug effects*; D014874:Water Pollutants, Chemical / Q000633:toxicity*
D010575:Pesticides; D012724:Sex Attractants; D014874:Water Pollutants, Chemical; D020926:Medetomidine