New applications of zoobenthos measurements for risk assessment of chemicals in aquatic ecosystems
Julkaistu sarjassa
Jyväskylä studies in biological and environmental scienceTekijät
Päivämäärä
2015Oppiaine
Akvaattiset tieteetBenthic animals in aquatic ecosystems suffer from various anthropogenic
pollutants. A challenge in risk assessment of chemicals in aquatic ecosystems (i.e.
ecological risk assessment) has been to balance cost-efficiency and effectiveness in
detecting early warning signals of chemicals. In this study, hyperspectral imaging
and behavioural measurements were evaluated as novel applications for detecting
chemical effects on benthic animals, and the reliability of the incidence of
chironomid morphological deformities as a more traditional bioindicator of
sediment ecotoxicity was assessed. Chironomid deformity experts (25) analysed an
identical set of samples for deformities. Deformity assessments were highly
subjective and inconsistent. Apparently, guidelines and criteria are needed to
improve and ascertain the reliability of deformity analysis. Hyperspectral imaging
was tested as a novel method to detect metal contamination of benthic
macroinvertebrates using cadmium (Cd) as a model metal. No effects of Cd were
observed on traditional toxicity endpoints, survival and number of morphological
gill abnormalities in caddisfly larvae. In contrast, hyperspectral features revealed a
weak association with Cd concentration indicating darkening of larval soft tissues
at high Cd. Further development and testing of this method and of the imaging
process in particular, are needed. Another novel method was based on a
quadrupole impedance conversion-technique to record behavioural responses of
animals. A Multispecies Freshwater Biomonitor (MFB), which utilizes this
technique, enabled quantitative behavioural measurements of benthic larvae in
sediment and in situ stream water exposures. MFB was found applicable for
recording different behaviours, locomotion and ventilation of chironomid, mayfly
and lamprey larvae, although no consistent behavioural responses in contaminated
sediments or mine-impacted streams were detected.
...
Artikkeliväitöskirja. Yhteenveto-osa ja viisi artikkelia. (Artikkelit eivät avoimesti saatavilla.) Article dissertation. An introduction and five articles (not available in this version).
Julkaisija
University of JyväskyläISBN
978-951-39-6416-0ISSN Hae Julkaisufoorumista
1456-9701Asiasanat
behaviour benthic macroinvertebrates hyperspectral imaging interrater reliability morphological deformities pohjaeläimistö vesieläimistö vesiekosysteemit ympäristön tila bioindikaattorit ympäristön saastuminen vesien saastuminen kemikaalit raskasmetallit haitalliset aineet vesistövaikutukset arviointi riskinarviointi ympäristövaikutukset ympäristöhaitat ympäristövaikutusten arviointi epämuodostumat mittausmenetelmät spektrikuvaus kadmium eläinten käyttäytyminen
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