The seasonal succession of the zooplankton of Lough Neagh, 1968–1978

Fitzsimons, A. G.; Andrew, T. E.

doi:10.1007/978-94-017-2117-2_15

Cited by 10 publications

(4 citation statements)

References 9 publications

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“…The dominant species of zooplankton in Lough Melvin were similar to those found in Lough Neagh and Lough Erne, suggesting that zooplankton composition is not particularly sensitive to trophic change (Gibson et al, 1980;Fitzsimons and Andrew, 1993). The dominance of E. gracilis over C. abyssorum in Lough Melvin appears to be characteristic of waters with low chlorophyll a concentrations; as in Lough Erne this is a characteristic of areas where chlorophyll a is low.…”

Section: Discussionsupporting

confidence: 54%

“…The dominance of E. gracilis over C. abyssorum in Lough Melvin appears to be characteristic of waters with low chlorophyll a concentrations; as in Lough Erne this is a characteristic of areas where chlorophyll a is low. In 1912, when Lough Neagh was only mildly enriched, E. gracilis was dominant, but by the 1970s C. abyssorum was dominant (Fitzsimons and Andrew, 1993).…”

Section: Discussionmentioning

confidence: 99%

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Trophic stability in an Irish mesotrophic lake: Lough Melvin

Girvan

Foy²

2006

Aquatic Conserv: Mar. Freshw. Ecosyst.

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ABSTRACT1. Mesotrophic lakes are a threatened habitat in the United Kingdom (UK), and are specified within the UK Biodiversity Action Plan (UKBAP) as requiring protection. Lough Melvin is a large mesotrophic lake that is of particular interest owing to the genetic diversity of its brown trout, but it is currently showing signs of nutrient enrichment.2. In 1990, average lake total phosphorus (TP) was less than 19 mg P L À1 but increased to 29.5 mg P L À1 by July 2001. Inflow TP also increased from 34 mg P L À1 to 41 mg P L À1 over the same period. Neither phosphorus nor nitrogen appeared to be limiting.3. Despite higher lake TP, annual chlorophyll a did not increase, remaining less than 5 mg L À1 . The phytoplankton was dominated by cyanobacteria and seems to have remained unchanged since the 1950s. Rotifer numbers increased significantly after 2001 but the macro-zooplankton did not. The absence of a phytoplankton response to P enrichment is attributed to light limitation caused by peat staining and thorough mixing.4. In the catchment, an accelerated programme of clear-felling began in 1999. Recent changes in the lake are consistent with the known impacts of clear-felling conifers on peat soils, namely larger P and dissolved organic carbon (DOC) losses. The latter was reflected in a lower Secchi depth and an enhanced microbial food-web supporting a larger rotifer population.5. It is suggested that, for the purposes of the Water Framework Directive (WFD), Lough Melvin and other large, alkaline but peat-stained lakes may be treated as a distinct lake type as they do not fit easily into the conventional classifications of dystrophic or mesotrophic lakes.

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Section: Discussionsupporting

confidence: 54%

Section: Discussionmentioning

confidence: 99%

Trophic stability in an Irish mesotrophic lake: Lough Melvin

Girvan

Foy²

2006

Aquatic Conserv: Mar. Freshw. Ecosyst.

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“…These relative increase patterns are typical for many lakes undergoing eutrophication (Ravera, 1980), where daphnids have been shown to benefit from eutrophication more than other zooplankton species, e.g., in Lago Lugano (Polli and Simona, 1992), Lago Maggiore (De Bernardi et al, 1988), and Lough Neagh (Fitzsimons and Andrew, 1993).…”

Section: Discussionmentioning

confidence: 78%

The response ofDaphniato changes in trophic status and weather patterns: a case study from Lake Constance

Straile

Geller²

1998

ICES Journal of Marine Science

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“…L -1 rotifers and 17 ind. L -1 crustaceans (Fitzsimons and Andrew, 1993). In the eutrophic Lake Võrtsjärv the corresponding numbers were 142 ind.…”

Section: Zooplanktonmentioning

confidence: 98%

Winter conditions in six European shallow lakes: a comparative synopsis

Dokulil

Herzig²,

Somogyi³

et al. 2014

Estonian J. Ecol.

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Abstract. This review summarizes winter conditions from six polymictic European shallow lakes. The lakes range from oligotrophic to hyper-eutrophic. Four of the lakes freeze regularly while ice cover is absent or rare in the two others. Ice duration and timing of ice-out are significantly influenced by climate signals in three of the lakes. Winter water temperature remains higher in nonice-covered lakes. No long-term trend in temperature is detectable except for one lake where winter water temperature began to increase in 1986. Secchi depth in winter is equal or greater than summer values in all six lakes indicating relatively better light conditions in winter. Total phosphorus concentration in winter ranges from 10 to 130 µg L -1 , which is equal or lower than summer values and is unrelated to chlorophyll a in five of the sites. Phytoplankton species composition during winter differs largely at the six sites. The winter assemblages largely depend on the trophic level and the conditions during the previous season. Winter chlorophyll a and phytoplankton biomass are usually lower than summer values because of reduced photosynthetic rates. Bacterial production often exceeds primary production. Epipelic algal assemblages tend to proliferate during winter in both ice-covered and non-ice-covered lakes. Primary production is low during winter because of insufficient light. Zooplankton abundances and biomass critically depend on conditions during the previous season and the winter situation and are quite variable from year to year, but their values correlate with the trophic status of the lakes. As a result, winter conditions are important to understand seasonal and annual changes in shallow lakes.

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The seasonal succession of the zooplankton of Lough Neagh, 1968–1978

Cited by 10 publications

References 9 publications

Trophic stability in an Irish mesotrophic lake: Lough Melvin

Trophic stability in an Irish mesotrophic lake: Lough Melvin

The response ofDaphniato changes in trophic status and weather patterns: a case study from Lake Constance

Winter conditions in six European shallow lakes: a comparative synopsis

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