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• W1796333669 abstract "Overlevnaden av lax (Salmo salar) och oring (Salmo trutta) under tillfalliga pH-sankningar under snosmaltningen studerades i tio vattendrag i norra Sverige. Olika hydrologiska parametrar mattes kontinuerligt och vattenprover for laboratorieanalys insamlades under forsoksperioden. Undersokningens syfte var att utvardera dodligheten hos oring- och laxyngel (1+) under snosmaltningen genom faltstudier for att identifiera vilka variabler som bast forklarar skillnader i overlevnad i vattendrag. Syftet var ocksa att bestamma kritiska toxicitets granser i vattendrag med naturligt hoga DOC-halter. Under varens smaltperiod okade koncentrationen av DOC kraftigt vilket orsakade en naturlig pH-sankning och en okning av aluminiumhalter. Detta resulterade i hog dodlighet hos den studerade fisken. Undersokningen visar att lax var mindre motstandskraftig mot laga pH-varden i vattnet jamfort med oring. Det insamlade materialet bekraftar aven att pH och ANC/H+ kvoten utgor goda indikatorer pa overlevnaden hos lax och oring. Studien indikerar vidare att fisk i vattendrag med hoga DOC halter har hogre overkevbad laga pH varden och oorganiska aluminiumhalter an fisk i vattendrag med laga DOC halter. Resultaten visar ocksa att en kritisk kemisk pH-niva kan faststallas for lax och oring i humusrika vattendrag (DOC >10mg/l). Enligt de kemiska observationerna av vattendragen indikerar detta att ca 40 % respektive 10 % av Krycklans 68 km2 stora avrinningsomrade inte ar lampliga for lax och oring. This study was designed to evaluate the survival of Atlantic salmon (Salmo salar) and brown trout (Salmo trutta) parr (1+) during the spring snow melt period in order to identify variables that best explain differences in fish survival among streams, and to define critical toxicity thresholds in organic rich waters. The experiments were carried out in 10 streams in northern Sweden. Different hydrological parameters were monitored continuously, and water samples for chemical analysis were collected throughout the experimental period. During the spring snow melt, DOC concentration increased strongly, causing a natural depletion of pH and an increase in total aluminium, which resulted in high fish mortality. Atlantic salmon was more sensitive than brown trout to acidic water in all streams during the experiments. Also, the mortality data confirmed that pH and ANC/H+ ratio constitute good predictors of Atlantic salmon and brown trout survival. The results also suggest that fish in DOC-rich streams can tolerate higher acidity and inorganic aluminium levels than fish in low DOC systems. Accordingly, a critical chemical threshold of pH (5.9 and 5.1) can be defined for Atlantic salmon and brown trout populations, respectively, in humic rich waters (DOC > 10 mg/l), about 0.3 pH units lower than for humic poor waters." @default.
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• W1796333669 date "2005-09-12" @default.
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• W1796333669 title "Survival of Atlantic salmon (Salmo salar L.) and brown trout (Salmo trutta L.) exposed to episodic acidification during spring flood" @default.
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