Tracing recovery under changing climate: response of phytoplankton and invertebrate assemblages to decreased acidification

Johnson, Richard K.; Angeler, David G.

doi:10.1899/09-171.1

Cited by 35 publications

(21 citation statements)

References 52 publications

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“…If so, the recent return of chaoborids to Lake Härsvatten could potentially be interpreted as an early biological sign of natural recovery from acidification in this lake. This is supported by recent physio-chemical monitoring data which show increases in pH, alkalinity, and total phosphorus levels, and simultaneous decreases in water transparency since the early 2000s (the Swedish University of Agricultural Sciences (SLU): http:// info1.ma.slu.se/IKEU/) and some recovery as regards species composition of phytoplankton and macrobenthos (Johnson & Angeler, 2010).…”

Section: Acidification and Mandible Dynamicsmentioning

confidence: 53%

Development of subfossil Daphnia and Chaoborus assemblages in relation to progressive acidification and fish community alterations in SW Sweden

2011

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Dated sediment cores from acidified and fishless Lake Gaffeln and Lake Härsvatten, SW Sweden, were analyzed for Daphnia ephippia and Chaoborus mandibles to test whether acidification history and fish extirpations could be reconstructed in a paleo-study using these easily identifiable animal remains. According to monitoring data fish were lost in both lakes from the 1950s to the 1970s. Progressive acidification prior to monitoring was confirmed by a gradual decrease and eventual loss of Daphnia ephippia in both study lakes during the first half of the twentieth century. In Lake Gaffeln mandibles of C. obscuripes appeared immediately after fish loss in 1973, and the regular presence of this species confirmed the succeeding fishless state of this lake. In Lake Härsvatten sediments C. obscuripes appeared only recently, i.e. three decades after fish extirpation, showing that the absence of C. obscuripes mandibles is not a trustworthy indicator of fish presence. Hence, the appearance of C. obscuripes was not temporally related to fish loss but confirmed the present fishless condition. Known historical presence of cyprinid fish in Lake Gaffeln was confirmed by a significantly higher proportion of fragmented mandibles of C. flavicans compared to the historically cyprinid-free Lake Härsvatten. In addition, both lake profiles displayed zero-proportions of fragmented mandibles during fishless periods. We conclude that acidification history and fish extirpations can be inferred by integrated studies on subfossil Daphnia ephippia and Chaoborus mandibles. However, during extreme ultraoligotrophic conditions in acidified clear-water lakes subfossil Chaoborus mandibles may be too scarce to infer fish absence/presence.

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Section: Acidification and Mandible Dynamicsmentioning

confidence: 53%

Development of subfossil Daphnia and Chaoborus assemblages in relation to progressive acidification and fish community alterations in SW Sweden

2011

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“…Johnson and Angeler (2010) analyzed data from a long-term study of phytoplankton and littoral macroinvertebrate assemblages in boreal lakes recovering from acidification and lakes that were minimally disturbed. Their goal was to compare pathways and trajectories of lake communities as climate changed.…”

Section: Evaluating the Link Between Climate Change And Biological Inmentioning

confidence: 99%

Using discharge dynamics characteristics to predict the effects of climate change on macroinvertebrates in lowland streams

Verdonschot¹,

Hoorn²

2010

Journal of the North American Benthological Society

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“…Recovery may be a slow process as biotic communities tend to exhibit hysteresis and timelags, and thus ecosystems take time to re-adjust to reduced stress (e.g., Yan et al, 2003;Johnson and Angeler, 2010). In an analysis of long-term datasets from 35 restored lakes, Jeppesen et al (2005) showed that internal nutrient loading delayed recovery, but in most lakes a new equilibrium for total P (TP) was reached after 10-15 years.…”

Section: Introductionmentioning

confidence: 99%

Assessing degradation and recovery pathways in lakes impacted by eutrophication using the sediment record

2015

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Efforts to restore enriched lakes have increased yet there remains uncertainty about whether restoration targets can be achieved and over what timescale. Paleoecological techniques, principally diatom analyses, were used to examine the degree of impact and recovery in 12 European lakes subject to eutrophication and subsequent reduction in nutrient loading. Dissimilarity scores showed that all sites experienced progressive deviation from the reference sample (core bottom) prior to nutrient reduction, and principal curves indicated gradual compositional change with enrichment. When additive models were applied to the latter, the changes were statistically significant in 9 of the 12 sites. Shifts in diatom composition following reduction in nutrient loading were more equivocal, with a reversal toward the reference flora seen only in four of the deep lakes and one of the shallow lakes. Of these, only two were significant (Lake Bled and Mjøsa). Alternative nutrient sources seem to explain the lack of apparent recovery in the other deep lakes. In three shallow lakes diatom assemblages were replaced by a community associated with lower productivity but not the one seen prior to enrichment. Internal loading and top down control may influence recovery in shallow lakes and climate change may have confounded recovery in several of the study sites. Hence, ecosystem recovery is not simply a reversal of the degradation pathway and may take several decades to complete or, for some lakes, may not take place at all. By assessing ecological change over a decadal to centennial timescale, the study highlights the important role that paleolimnology can play in establishing a benchmark against which managers can evaluate the degree to which their restoration efforts are successful.

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Tracing recovery under changing climate: response of phytoplankton and invertebrate assemblages to decreased acidification

Cited by 35 publications

References 52 publications

Development of subfossil Daphnia and Chaoborus assemblages in relation to progressive acidification and fish community alterations in SW Sweden

Development of subfossil Daphnia and Chaoborus assemblages in relation to progressive acidification and fish community alterations in SW Sweden

Using discharge dynamics characteristics to predict the effects of climate change on macroinvertebrates in lowland streams

Assessing degradation and recovery pathways in lakes impacted by eutrophication using the sediment record

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