A review of the lethal and sub-lethal effects of mercury on aquatic life

Taylor, David L.

doi:10.1007/978-1-4612-6214-5_2

Cited by 14 publications

(6 citation statements)

References 88 publications

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“…These processes may in fact be considered as detoxification mechanisms, and the cell performs this function by accumulating metals in high intracellular concentrations. Dosis of 2 pg/L Cd in freshwater and 100 pg/L Cd in marine water determine lethal effects [26]; sublethal effects take place with 1 pg/L Cd and 7 pg/L Cd in freshwater and sea water, respectively. On the marine systems the toxicity of cadmium occurs with higher concentrations than in freshwater.…”

Section: Discussionmentioning

confidence: 99%

Experimental Approach to Cadmium Effects on a Marine Protozoan Community Untersuchungen zum Einfluß von Cadmium auf eine marine Protozoen‐Gemeinschaft

Fernández-Leborans

Novillo

1994

Acta hydrochim. hydrobiol.

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Summary:The effects of cadmium on a marine protozoan community were studied. After 96 h (0.5 mg/L cadmium) there was a reduction of biomass and a dissappearance of bacterivorous ciliates that were replaced by small flagellates. Other cadmium concentrations utilised affected abundance and biomass after 48 hours. A change of the community structure by the loss of Cd-sensible species and the appearance of Cd-resistant species occurred. The structure of community was simplified and the diversity and variety values decreased. The bacterivore-detritivore and photoautotroph groups, that were the main components in the control, were notably reduced in the presence of cadmium. The metal concentrations on the protozoan biomass increased during the experiment, indicating a certain bioassimilative role of these organisms.

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Section: Discussionmentioning

confidence: 99%

Experimental Approach to Cadmium Effects on a Marine Protozoan Community Untersuchungen zum Einfluß von Cadmium auf eine marine Protozoen‐Gemeinschaft

Fernández-Leborans

Novillo

1994

Acta hydrochim. hydrobiol.

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“…In marine water, the reported lethal effects of soluble cadmium compounds occur at a concentration over 95? gl" 1 (Taylor, 1981) Thus, according to the GES-AMP Hazard profile system (Portmann, 1981), these materials would be considered to be highly toxic to aquatic ecosystem. The present investigation reveals that cadmium has seriously inhibited the filtration rate of the clam Venerupis aurea.…”

Section: Discussionmentioning

confidence: 99%

Effect of Cadmium as a Water Pollutant on the Filtration Rate and the Histology of the Siphon of the Marine Clam Venerupis a Urea

Mohamadein

Desouky

2002

Egypt. J. of Aquatic Biolo. and Fish.

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C admium is one of the most harmful environmental pollutants and has major toxicological effects on marine organisms. The present investigation was performed to study the effect of sublethal concentrations of cadmium on the filtration rate and siphon histology of the clam, Venerupis aurea. All applied concentrations of cadmium were found to inhibit the filtration rate of the investigated species. Histopathological studies revealed also that exposure to 300 ppb of cadmium induced severe effects on the siphonal wall of the clam, which ultimately reduce the filtration rate. Firstly, it reduces the efficiency of the straining tentacles in preventing the entrance of large particles into the mantle cavity; secondly, it leads to contraction and shortening of the siphon that resulted in shortening of gill axis and reduction of interfilamentar space. This will reduce the power and capacity of the filter pump. Other histopathological effects of cadmium on the siphon were increased mucous secretion and constriction of the lumen that may affect the flow of water into mantle cavity. Moreover, it leads to necrosis of the outer and inner epithelia, derangement of muscle fibers and enlargement of blood lacunae.

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“…Several reviews concern the toxicity of mercury to aquatic life (Bryan, 1976;Stebbing, 1976;Davies. 1978;Leland et al, 1979;Taylor 1979). Laboratory experiments seldom show effects at concentrations below 1 pg Hg 1-'.…”

Section: Bacteriamentioning

confidence: 99%

Effects of mercury on enclosed plankton communities in the Rosfjord during POSER

Kuiper¹,

Brockmann²,

Groenewoud³

et al. 1983

Mar. Ecol. Prog. Ser.

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During POSER 2 experiments were performed to study the effects of a single addition of mercury (11) chloride on the development of plankton communities enclosed in large plastic bags. containing 1.5 to 30 m3 water and ranging from 3 to 40 m in depth. The experiments lasted 1 and 3 wk. respectively. In one of these experiments the influence of an additional dose of nutrients was studied. During both experiments mercury concentrations in the water decreased after the addition. Part of the mercury was found in the sediment collected on the bottom of the bags during the experiment, but most of the mercury probably volatilized and was lost to the atmosphere. Addition of 1 or 5 yg Hg I-' in the first experiment resulted in lower numbers of bacteria than in the controls. The first experiment was too short to show effects on phytoplankton and zooplankton. Addition of 5 pg Hg 1-' in the second experiment inhibited bacteria and phytoplankton, and increased the mortality of copepods, which formed the principal part of the zooplankton. Our results are comparable to those obtained during other experiments with natural marine plankton communities also enclosed in large plastic bags in fairly different sea areas Addition of nutrients stimulated phytoplankton growth, but had no observable effects on bacteria or zooplankton.

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A review of the lethal and sub-lethal effects of mercury on aquatic life

Cited by 14 publications

References 88 publications

Experimental Approach to Cadmium Effects on a Marine Protozoan Community Untersuchungen zum Einfluß von Cadmium auf eine marine Protozoen‐Gemeinschaft

Experimental Approach to Cadmium Effects on a Marine Protozoan Community Untersuchungen zum Einfluß von Cadmium auf eine marine Protozoen‐Gemeinschaft

Effect of Cadmium as a Water Pollutant on the Filtration Rate and the Histology of the Siphon of the Marine Clam Venerupis a Urea

Effects of mercury on enclosed plankton communities in the Rosfjord during POSER

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