Post-Glacial Chironomid Succession in Two Small, Humic Lakes in the New Brunswick-Nova Scotia (Canada) Border Area

Walker, Ian R.; Paterson, C. G.

doi:10.2307/1467111

Cited by 35 publications

(35 citation statements)

References 15 publications

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“…Analyses of water and sediment samples collected from each lake were performed using methods described by Walker (1982) and Walker & Paterson (1983) . All pH measurements represent summer values .…”

Section: Methodsmentioning

confidence: 99%

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Associations of diatoms in the surficial sediments of lakes and peat pools in Atlantic Canada

Walker

Paterson

1986

Hydrobiologia

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The distribution of diatom frustules in the surficial sediments of lakes and ombrotrophic peat pools in Atlantic Canada are examined especially in relation to pH and bog lake succession . Sedimentary diatom associations for peat pools, strongly acidic lakes, and weakly acidic lakes are characterized . These associations and the derived diatom-pH calibration functions will facilitate improved paleoecological interpretation of natural ontogenetic pathways and assessments of recent anthropogenic impacts .

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Section: Methodsmentioning

confidence: 99%

“…Although formed secondarily, as openings within bog surfaces, these pools have physical and chemical similarities to senescent bog lakes . Consequently the biota of bog lakes may ultimately approach that existing in bog pools (Walker et al, 1985 ;Walker & Paterson, 1983) .…”

Section: Study Areamentioning

confidence: 99%

Associations of diatoms in the surficial sediments of lakes and peat pools in Atlantic Canada

Walker

Paterson

1986

Hydrobiologia

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“…Recently deglaciated parts of Atlantic Canada, Québec, and Maine by this time were occupied by herb tundra, shrub tundra, and forest tundra in succession outward from the ice sheet margin (Terasmae, 1973;Richard and Poulin, 1976;Mott, 1977;Richard, 1977;Savoie and Richard, 1979;Green, 1981;Mott and Farley-Gill, 1981;Walker and Paterson, 1983;Tolonen and Tolonen, 1984;Macpherson, 1985;Mott et al, 1986;Dredge et al, 1992;Jetté and Richard, 1992;Wolfe and Butler, 1994;McCarthy et al, 1995;Marcoux and Richard, 1995;Jetté and Mott, 1995). In Newfoundland, eight sites reverted from shrub tundra to herb tundra by about 11 ka BP (T. Anderson and Lewis, 1992; T. Anderson and Macpherson, 1994) and remaining shrub tundra was characterized by birch and willow amongst the shrubs.…”

Section: Ka Bpmentioning

confidence: 99%

Late Quaternary Vegetation History of Northern North America Based on Pollen, Macrofossil, and Faunal Remains*

Dyke

2007

gpq

114

118

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AbstractBiome maps spanning the interval from the last glacial maximum to modern times are presented. The biome distributions at 18 ka BP were probably as nearly in equilibrium with climate as are the modern distributions, but deglacial biomes were probably in disequilibrium. Ice sheet configuration was a strong control of climate until 7 ka BP. Regional climate trends can be inferred from changing biome distributions, but during periods of disequilibrium, biome distributions under-represent summer warming. Because of summer cooling by 2-4 °C during the Holocene, largely in the last 3-5 ka, middle and certain early Holocene biome distributions and species compositions are reasonable analogues of future equilibrium displacements due to equivalent warming, at least in areas that were long-since deglaciated. Past biome migration rates in response to rapid regional warming during deglaciation were mainly in the range of 100-200 m per year. If these rates pertain in the future, biomes may shift 10-20 km in most regions over the next century. A major impediment to using former Holocene conditions as a guide to future conditions is that warmer Holocene summers were accompanied by colder winters, whereas warmer future summers will be accompanied by warmer winters.

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“…During Period III three species of Chironomus were present, although only one was present in any numbers. In many other lakes experiencing substantial acidification, species of Chironomus also appear or become more abundant (Wiederholm & Eriksson, 1977;Mossberg & Nyberg, 1979;Saether, 1979;Raddum & Saether, 1981;Walker & Paterson, 1983).…”

Section: Period III (191 O-l 950) -Increasing Acidificationmentioning

confidence: 99%

Responses of insects, especially Chironomidae (Diptera), and mites to 130 years of acidification in a Scottish lake

Brodin

Gransberg

1993

Hydrobiologia

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About 130 years of anthropogenic acidification of Round Loch of Glenhead, SW Scotland, has resulted in successively decreased stability, diversity, productivity and survival rate of the non-biting midge (Diptera: Chironomidae) fauna. Similar trends have also been observed among mayflies, caddis-flies and water mites. The first effects of anthropogenic acidification on the insect and mite fauna, as evidenced by palaeolimnological analyses of 210Pb-dated sediment cores, occurred as early as around 1850, i.e. earlier than in any other lake hitherto studied. The drop in the lake's pH was first indicated by decreased stability and changes in species composition of chironomids and mayflies in the littoral zone. Major changes in the profundal chironomid fauna did not take place until about 1950, when mean lake pH dropped below 5.0. At the same time, the littoral insect fauna became even more unstable and the first significant elimination of species occurred. Comparison with insect fauna of other lakes suggests that a pH of less than 5 might be critical for the ecological conditions in many acidified lakes. None of the twelve most common chironomid species present prior to the acidification of the lake had disappeared after 120-130 years of considerable acidification, and they are all common in oligotrophic lakes with a pH of 6.5-7.0. This is in contrast to the effects of heavy acidification on other aquatic animal groups. Chironomids are probably more sensitive to lake trophic status than lake acidity.

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Post-Glacial Chironomid Succession in Two Small, Humic Lakes in the New Brunswick-Nova Scotia (Canada) Border Area

Cited by 35 publications

References 15 publications

Associations of diatoms in the surficial sediments of lakes and peat pools in Atlantic Canada

Associations of diatoms in the surficial sediments of lakes and peat pools in Atlantic Canada

Late Quaternary Vegetation History of Northern North America Based on Pollen, Macrofossil, and Faunal Remains*

Responses of insects, especially Chironomidae (Diptera), and mites to 130 years of acidification in a Scottish lake

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