0000000001150592
AUTHOR
Juhani Hynynen
Benthic Invertebrates in Relation to Acidity in Finnish Forest Lakes
In order to examine the effects of acidity on abundance and community structure of the benthic invertebrates in forest lakes and to evaluate the applicability of certain benthic animals as early warning indicators of lake acidification, 140 lakes, situated mainly in southern Finland, were studied by quantitative and qualitative sampling methods.
Environmental history of an urban lake: a palaeolimnological study of Lake Jyväsjärvi, Finland
Sedimentary diatom frustules and chironomid remains, in addition to the chemical stratigraphy of 32 elements and organic pollutants such as resin acids, PCB, DDT and its metabolites, were studied from core samples taken from Lake Jyvasjarvi in Central Finland (64° 14′ N, 25° 47′ E). The sediment profile covered over 200 years, with the oldest samples representing a period of very low human interference. The town of Jyvaskyla was established on the lake shore in 1837, and the lake received untreated municipal wastewater from the town up until, 1977. A paper mill started operations in 1872 and began discharging effluent into Lake Jyvasjarvi. In recent years this effluent loading has been redu…
Anthropogenic changes in Finnish lakes during the past 150 years inferred from benthic invertebrates and their sedimentary remains
Järvien kuormitus-, rehevöitymis- ja palautumishistoria on ollut monivaiheinen ja pitkäkestoinen. Monet teollisuuden ja asumajätevesien kuormittamista järvistämme olivat lähes luonnontilaisia vielä 1900-luvun alussa, likaantuivat myöhemmin voimakkaasti, mutta ovat sittemmin alkaneet elpyä. Hajakuormituksesta kärsivissä järvissä rehevöityminen sen sijaan on edelleenkin jatkunut. Tämä selviää Juhani Hynysen vesistöjen ympäristöhistoriaa käsittelevässä väitöskirjassa, jossa hän on tutkinut puunjalostusteollisuuden kuormituksen, asumajätevesien sekä hajakuormituksen vaikutuksia suurten järvien biologisen tilan kehitykseen noin 1800-luvun puolivälistä nykypäivään. This thesis focuses on two them…
POPs and organic polysufides in sediments of Lake Ladoga
Abstract The study included one station close to a pollution source (depth 59 m) and another far from polluted areas (depth 40 m). Samples were analysed for organic chlorine, bromine and sulfur compounds. Samples taken with a corer were sliced to the layers of 0–1, 1–4, 4–7 cm etc. down to the depth of 34 cm. The dating was made with two independent methods, the 210Po method and with the soot particle counting method. The analyses were made with a multiresidue method. Gas chromatography was connected to low resolution mass spectrometry (LRMS) or to high resolution mass spectrometry (HRMS). A different extraction was applied to screen the possible occurrence of polysulfides. Typical chloroph…