Lethal and sublethal effects of naphthalene and 1,2-dimethylnaphthalene on naupliar and adult stages of the marine cyclopoid copepod Oithona davisae.
Short-term (24h) exposure experiments have been conducted to determine the effects of two environmental relevant polycyclic aromatic hydrocarbons (PAHs), naphthalene (NAPH) and dimethylnaphthalene (C2-NAPH), on the naupliar and adult stages of the marine cyclopoid copepod Oithona davisae. To resemble more realistic conditions, those exposure experiments were conducted under the presence of food. The naupliar stages evidenced lower tolerance to PAH exposure regarding narcotic and lethal effects than adults. Copepod feeding activity showed to be very sensitive to the presence of the studied PAHs, detrimental effects occurring at toxic concentrations ca. 2-3 fold lower than for narcotic effects. In addition we report PAH-mediated changes in cell size and growth rate of the prey item, the heterotrophic dinoflagellate Oxyrrhis marina, that could indirectly affect copepod feeding and help explain hormesis-like responses in our feeding experiments.
Saiz
Enric
E
Institut de Ciències del Mar, CSIC, Barcelona, Catalunya, Spain. enric@icm.csic.es
Movilla
Juancho
J
Yebra
Lidia
L
Barata
Carlos
C
Calbet
Albert
A
D000818:Animals; D033342:Copepoda / Q000187:drug effects / Q000502:physiology*; D004141:Dinoflagellida / Q000187:drug effects / Q000502:physiology; D020387:Food Chain; D007814:Larva / Q000187:drug effects; D007928:Lethal Dose 50; D009281:Naphthalenes / Q000633:toxicity*; D053608:Stupor / Q000139:chemically induced; D023382:Toxicity Tests, Acute; D014874:Water Pollutants, Chemical / Q000633:toxicity*
D009281:Naphthalenes; D014874:Water Pollutants, Chemical; C031721:naphthalene; C117619:1,2-dimethylnaphthalene