caa a22 4500 465792634 CHVBK 20180323112029.0 cr unu---uuuuu 170327e19900901xx s 000 0 eng 10.2307/1351921 doi (NATIONALLICENCE)springer-10.2307/1351921 The effects of tributyltin within a Thalassia seagrass ecosystem [Elektronische Daten] [John Kelly, Suzanne Levine, Linda Buttel, Kelly Carr, David Rudnick, R. Morton] Flow-through seagrass core microcosms were used to examine responses of species and processes to a logarithmic gradient of dosing with14C-labeled tributyltin-chloride (TBT-CI). Experiments involved delivery of TBT-CI to the water column of replicate cores of a treatment (n=16) once per week; one-half of the cores were sacrificed after 3 wk of dosing, the others were dosed for 6 wk. Initial water column concentrations for the three treatments averaged 0.205, 2.23, and 22.21 μg I−1, expressed as the TBT+ cation, but these concentrations dropped rapidly. Retained14C tracer, an estimate of total organotin species, was distributed to sediments, plants, and other biological tissues, all of whose tracer concentrations increased with time. Measures to indicate responses of both autotrophic and heterotrophic organisms were made; in general, treatment effects were demonstrable statistically only at the highest dose level. Accumulation of chlorophyll and biomass on glass slides was highest when suspended for the entire experiment in the water of the highest treatment; this unexpected result was perhaps an indirect effect related to reduced grazing activity in the microcosms. The highest dose of TBT-CI resulted in virtual population mortality of a few macrobenthic species and decreased loss of plant material in litter bags, both demonstrated within the first 3 wk of dosing. Reduced litter loss was coincident with mortality of an amphipod (Cymadusa compta) capable of shredding plant material, and a causal relation between the two effects is plausible. Thus, if concentrated to similar levels in aThalassia bed, TBT+ may have direct species-level effects and process-level effects, potentially causing ecosystem change via disruption of a species-process linkage influential in seagrass detrital food web dynamics. Estuarine Research Federation, 1990 Kelly John Ecosystems Research Center, Cornell University, 14853, Ithaca, New York aut Levine Suzanne Ecosystems Research Center, Cornell University, 14853, Ithaca, New York aut Buttel Linda Ecosystems Research Center, Cornell University, 14853, Ithaca, New York aut Carr Kelly University of West Florida, 32514, Pensacola, Florida aut Rudnick David Ecosystems Research Center, Cornell University, 14853, Ithaca, New York aut Morton R. Ecosystems Research Center, Cornell University, 14853, Ithaca, New York aut Estuaries Springer-Verlag 13/3(1990-09-01), 301-310 0160-8347 13:3<301 1990 13 12237 https://doi.org/10.2307/1351921 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.2307/1351921 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Kelly John Ecosystems Research Center, Cornell University, 14853, Ithaca, New York aut NATIONALLICENCE 700 1- Levine Suzanne Ecosystems Research Center, Cornell University, 14853, Ithaca, New York aut NATIONALLICENCE 700 1- Buttel Linda Ecosystems Research Center, Cornell University, 14853, Ithaca, New York aut NATIONALLICENCE 700 1- Carr Kelly University of West Florida, 32514, Pensacola, Florida aut NATIONALLICENCE 700 1- Rudnick David Ecosystems Research Center, Cornell University, 14853, Ithaca, New York aut NATIONALLICENCE 700 1- Morton R. Ecosystems Research Center, Cornell University, 14853, Ithaca, New York aut NATIONALLICENCE 773 0- Estuaries Springer-Verlag 13/3(1990-09-01), 301-310 0160-8347 13:3<301 1990 13 12237 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer