in bioindication you should differ several groups that can be useful due to aims of investigators study. Some of tham are of immediate reaction on serroundings changes (with short life terms and highly-dynamic communities), and other are of long term reactivity on impact. So, Oysters belongs into the second group. Moreover, like all Bivalvs Mollusks their motility is very poor, so indicate water state in special local sites and good for a long term monitoring. for my opinion the most important is reaction of population structure, proportion of different stages of development, productivity and other community peculiarities (like amount of planktonic larvae of mollusks)!
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We have an extensive data base of oyster (and other bivalve) contaminant data for the United States which may be useful for comparison. You can download these data for free here: http://egisws02.nos.noaa.gov/nsandt/
If you have questions about navigating the database, or about the data itself, feel free to contact me directly.
you can try as well to contact Oyster Faculty, University of Maryland Center for Environmental Science · Horn Point Laboratory United States, Cambridge
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here is a link to the University of Maryland poster: http://ian.umces.edu/press/posters/publication/205/oyster_15n_as_a_bioindicator_of_waste_nitrogen_and_degraded_water_quality_in_a_sub_estuary_of_chesapeake_bay_2008-11-01/
Oyster δ15N as a bioindicator of waste nitrogen and degraded water quality in a sub-estuary of Chesapeake Bay
Presented at the National Estuarine Research Reserves System (NERRS) in Pacific Grove, CA in November 2008.
Once nitrogen from wastewater treatment plants and septic systems enters aquatic ecosystems, it is difficult to distinguish it from other sources contributing to degradation. The Monie Bay sub-estuary of Chesapeake Bay, just south of Wicomico River, is situated within the Chesapeake Bay (Maryland) National Estuarine Research Reserve. Monie Bay receives freshwater inputs from three creeks varying in watershed size and land use: residential septic systems (Monie Creek), crop fertilizer (Little Monie Creek), and wetlands/forest (Little Creek). Differences in oyster δ15N were used to identify different waste nitrogen sources.
Oyster larvae are used in sediment toxicity tests. You may find some information in the following ref.: Chapman, P.M. and J.D. Morgan (1983) Sediment bioassays with oyster larvae. Bull. Environ. Contam. Toxicol., 31, p. 438-444.
Bivalve species including oyster, mussels and clams are excellent biomonitors for the evaluation of heavy metals pollution. Several attributes that make
oysters superior than other organisms for environmental monitoring include: wide geographical distribution, abundant, sedentary, tolerant to environmental alterations, tolerant to various environmental contaminants, high biocon-
centration factors of pollutants, very low-level metabolizing enzyme activities of organic contaminants, wide and stable populations, reasonably long life span, reasonable size, high survive in laboratory and field conditions, etc. Bioaccumulation is the commonly used means in biomonitoring of heavy metal pollution using oysters. Alterations of enzyme activities like alkaline phosphatase are also reported due to heavy metal exposure