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Full-Text Articles in Pharmacology, Toxicology and Environmental Health
Joint Effects Of Population Density And Toxicant Exposure On Population Dynamics Of Capitella Sp. I, Valery E. Forbes, Richard M. Sibly, Inez Linke-Gamenick
Joint Effects Of Population Density And Toxicant Exposure On Population Dynamics Of Capitella Sp. I, Valery E. Forbes, Richard M. Sibly, Inez Linke-Gamenick
Valery Forbes Publications
Very few studies have analyzed the dependence of population growth rate on population density, and even fewer have considered interaction effects of density and other stresses, such as exposure to toxic chemicals. Yet without such studies we cannot know whether chemicals harmful at low density have effects on carrying capacity or, conversely, whether chemicals reducing carrying capacity are also harmful at low density, impeding a population’s capacity to recover from disturbance. This study examines the combined effects of population density and a toxicant (fluoranthene) on population growth rate (pgr) and carrying capacity using the deposit-feeding polychaete Capitella sp. I as …
Effects Of Chronic Fluoranthene Exposure On Sibling Species Of Capitella With Different Development Modes, Inez Linke-Gamenick, Valery E. Forbes, Nuria Méndez
Effects Of Chronic Fluoranthene Exposure On Sibling Species Of Capitella With Different Development Modes, Inez Linke-Gamenick, Valery E. Forbes, Nuria Méndez
Valery Forbes Publications
Toxic effects of the polycyclic aromatic hydrocarbon fluoranthene (FLU) on life-history traits and their demographic consequences were investigated in 3 non-interbreeding Capitella sibling species with different physiological tolerances and developmental modes: sensitive Capitella sp. S from oxygen-rich intertidal sediments of the North Sea (Germany); tolerant Capitella sp. M from sediments near shallow hydrothermal vents off Milos (Greece), a habitat low in organic matter with steep abiotic gradients and high sulfide concentrations; tolerant Capitella sp. I from New York (USA), known to dominate eutrophicated/polluted environments. Both Capitella spp. M and I can develop into hermaphrodites and have lecithotrophic larval development. In …
Effects Of Fluoranthene And Ambient Oxygen Levels On Survival And Metabolism In Three Sibling Species Of Capitella (Polychaeta), Inez Linke-Gamenick, Bent Vismann, Valery E. Forbes
Effects Of Fluoranthene And Ambient Oxygen Levels On Survival And Metabolism In Three Sibling Species Of Capitella (Polychaeta), Inez Linke-Gamenick, Bent Vismann, Valery E. Forbes
Valery Forbes Publications
The successful persistence of Capitella spp. in disturbed and/or oil-polluted habitats is widely known, but demographic adaptations might be only part of the explanation and little is known about differences among species. The present study investigates ecophysiological effects of the common PAH (polycyclic aromatic hydrocarbon) fluoranthene (FLU) on juvenile and adult survival, comparing 3 sibling species of Capitella (Polychaeta; Capitellidae). Subsequently, the influence of FLU on the aerobic and anaerobic metabolism in the most 'sensitive' species, Capitella sp. S, and most 'tolerant' species, Capitella sp. I, was assessed. Oxygen uptake and internal succinate concentration (an indicator of anaerobic metabolism) were …
Density-Dependent Effects Of A Toxicant On Life-History Traits And Population Dynamics Of A Capitellid Polychaete, Inez Linke-Gamenick, Valery E. Forbes, Richard M. Sibly
Density-Dependent Effects Of A Toxicant On Life-History Traits And Population Dynamics Of A Capitellid Polychaete, Inez Linke-Gamenick, Valery E. Forbes, Richard M. Sibly
Valery Forbes Publications
The toxic effects of the widespread polycyclic aromatic hydrocarbon (PAH), fluoranthene (FLU), on Life-history traits of Capitella sp. M as a function of population density were investigated in a life-table-response-experiment (LTRE) lasting 134 d. Animals from laboratory cultures were exposed to 6 different FLU concentrations (range 0 to 80 μg FLU [g dry wt sed]–1, ppm) at 3 population densities (range 529 to 36 842 worms m–2), and survivorship, growth rate until maturity, and reproductive parameters were recorded. Fluoranthene exposure significantly reduced juvenile survivorship in a concentration- dependent manner, whereas population density had no effect on …
Particle Mixing By The Polychaete Capitella Species 1: Coupling Fate And Effect Of A Particle-Bound Organic Contaminant (Fluoranthene) In A Marine Sediment, Susanne D. Madsen, Thomas L. Forbes, Valery E. Forbes
Particle Mixing By The Polychaete Capitella Species 1: Coupling Fate And Effect Of A Particle-Bound Organic Contaminant (Fluoranthene) In A Marine Sediment, Susanne D. Madsen, Thomas L. Forbes, Valery E. Forbes
Valery Forbes Publications
Particle mixing by the polychaete Capitella sp. 1 was investigated in a 22 d microcosm experiment in the presence and absence of the sediment-bound polycyclic aromatic hydrocarbon (PAH) fluoranthene. Mixing by Capitella sp. 1 (30000 ind. m–2) was examined using glass bead tracers (diam. = 30 to 100 μm) with and without a pulse introduction of fluoranthene to the sediment surface. Worms had a profound effect on the sediment appearance and reworked sediment in a conveyor-belt fashion. The predominant mode of mixing was bioadvective, and the worms created a subsurface maximum in the glass bead tracer profiles. Glass …