The influence of sediment contaminated with polycyclic aromatic hydrocarbons (PAHs) on the meiobenthic copepod community of a Louisiana salt marsh was examined with microcosms of sediment containing natural l'aunal assembiages. Microcosms were dosed with PAH-contaminateti sediment that ranged in concentration from 0.3 (controls) io 27 mg PAH/kg dry sediment, and effects were followed for 28 days. Data suggest that highest doses (High-PAH) elicited avoidance behavior by Pseudostenhelia wellsi (Coull and Fleeger) copepods and nauplii, particularly 12 h after contaminants were added (Day 0). Weaker avoidance behavior was indicateti in non-P. wellsi species that was manifested as increases in nauplius/copepod ratios. Nematode/copepod ratios were calculated for each of 4 species (P. wellsi, Coullana sp., Enhydrosoma sp., and Onv(-hocanipttis nzohwwned (Blanchard and Richard)); only nematode/P. wellsi ratios were significantly affected by PAH. High-PAH treatments allo lead to a higher proportion of females in P. wellsi and Coullana sp. This effect was only observed from Day 7 on and is interpreted as an indication of disproportionately high mortality of males. Collectively, our data demonstrate that relatively low-level PAH contamination may cause many ecologically important impacts on copepod community structure that may noi be detected at the level of higher taxon.

Influence of polyciclic aromatic hydrocarbons on the meiobenthic-copepod community of a Louisiana salt marsh / Carman, K. R.; Todaro, Mary Antonio Donatello. - In: JOURNAL OF EXPERIMENTAL MARINE BIOLOGY AND ECOLOGY. - ISSN 0022-0981. - STAMPA. - 198:(1996), pp. 37-54.

Influence of polyciclic aromatic hydrocarbons on the meiobenthic-copepod community of a Louisiana salt marsh

TODARO, Mary Antonio Donatello
1996

Abstract

The influence of sediment contaminated with polycyclic aromatic hydrocarbons (PAHs) on the meiobenthic copepod community of a Louisiana salt marsh was examined with microcosms of sediment containing natural l'aunal assembiages. Microcosms were dosed with PAH-contaminateti sediment that ranged in concentration from 0.3 (controls) io 27 mg PAH/kg dry sediment, and effects were followed for 28 days. Data suggest that highest doses (High-PAH) elicited avoidance behavior by Pseudostenhelia wellsi (Coull and Fleeger) copepods and nauplii, particularly 12 h after contaminants were added (Day 0). Weaker avoidance behavior was indicateti in non-P. wellsi species that was manifested as increases in nauplius/copepod ratios. Nematode/copepod ratios were calculated for each of 4 species (P. wellsi, Coullana sp., Enhydrosoma sp., and Onv(-hocanipttis nzohwwned (Blanchard and Richard)); only nematode/P. wellsi ratios were significantly affected by PAH. High-PAH treatments allo lead to a higher proportion of females in P. wellsi and Coullana sp. This effect was only observed from Day 7 on and is interpreted as an indication of disproportionately high mortality of males. Collectively, our data demonstrate that relatively low-level PAH contamination may cause many ecologically important impacts on copepod community structure that may noi be detected at the level of higher taxon.
1996
198
37
54
Influence of polyciclic aromatic hydrocarbons on the meiobenthic-copepod community of a Louisiana salt marsh / Carman, K. R.; Todaro, Mary Antonio Donatello. - In: JOURNAL OF EXPERIMENTAL MARINE BIOLOGY AND ECOLOGY. - ISSN 0022-0981. - STAMPA. - 198:(1996), pp. 37-54.
Carman, K. R.; Todaro, Mary Antonio Donatello
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