Dietary metal toxicity to the marine sea hare, Aplysia californica.

Autor: Jarvis TA; Department of Biology, Valdosta State University, Valdosta, GA, USA., Capo TR; Division of Marine Biology and Fisheries, National Resource for Aplysia, University of Miami Aplysia Resource Facility, Rosenstiel School of Marine and Atmospheric Science, Miami, FL, USA., Bielmyer-Fraser GK; Department of Biology, Valdosta State University, Valdosta, GA, USA. Electronic address: gkbielmyer@valdosta.edu.
Jazyk: angličtina
Zdroj: Comparative biochemistry and physiology. Toxicology & pharmacology : CBP [Comp Biochem Physiol C Toxicol Pharmacol] 2015 Aug-Sep; Vol. 174-175, pp. 54-64. Date of Electronic Publication: 2015 Jun 27.
DOI: 10.1016/j.cbpc.2015.06.009
Abstrakt: Metal pollution from anthropogenic inputs is a concern in many marine environments. Metals accumulate in tissue and in excess cause toxicity in marine organisms. This study investigated the accumulation and effects of dietary metals in a macroinvertebrate. The green seaweed, Ulva lactuca and the red seaweed, Agardhiella subulata were each concurrently exposed to two concentrations (100 or 1000 μg/L) of five metals (Cu, Ni, Pb, Cd, and Zn). Additionally, U. lactuca was exposed to 10 μg/L of the metal mixture as well as 10 or 100 μg/L of each metal individually for 48 h. The seaweeds were then used as food for the sea hare, Aplysia californica for two to three weeks depending on the exposure concentration. Body mass of A. californica was measured weekly, and at the end of the exposure duration, metal concentrations were quantified in dissected organs (mouth, esophagus, crop, gizzard, ovotestis, heart, hepatopancreas, gill, and the carcass). Metal distribution and accumulation in the organs of A. californica varied with the metal. A. californica fed the metal-exposed diets had significantly reduced body weight by the end of the exposure periods, as compared to controls; however, differences were observed in the extent of growth reductions, dependent on exposure concentration, duration, and exposure regime (metal mixture versus individual metal-exposed diet). Metal mixture diets decreased A. californica growth more so than comparable individual metal diets, despite more metal accumulating in the individual metal diets. Additionally, Zn- and Cu-contaminated algal diets decreased control-normalized growth of A. californica significantly more than comparable Cd-, Pb-, or Ni-contaminated diets. The seaweed diets in this study contained environmentally relevant tissue metal burdens. Therefore, these results have implications for metals in marine systems.
(Copyright © 2015. Published by Elsevier Inc.)
Databáze: MEDLINE
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