Effects of long-term non-point eutrophication on the abundance and biomass of macrozoobenthos in small lakes of Estonia

Timm, Henn; Möls, Tõnu; Timm, Tarmo

doi:10.3176/biol.ecol.2006.3.01

Cited by 8 publications

(2 citation statements)

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“…Nutrient reduction in nutrient‐rich waters may benefit mussels by limiting algal blooms and the development of hypoxic conditions as algae decomposes. Highly eutrophic conditions can be harmful to mussels: in the River Jorka in Poland, nutrient enrichment may have contributed to the extirpation of some unionid species at sites experiencing periods of anoxia (Kołodziejczyk et al, 2009 ), and in a study of Estonian lakes, mussel density reductions were linked to eutrophication‐driven hypoxia (Timm et al, 2006 ). Conversely, nutrient reduction in nutrient‐poor waters may be harmful to mussels since reduced algal growth may start to limit food availability.…”

Section: Discussionmentioning

confidence: 99%

“…Revisiting the site first surveyed by Negus in 1964 offers the opportunity to add to a developing picture of mussel decline across Europe (e.g. Arter, 1989 ; Lewandowski & Kołodziejczyk, 2014 ; Ożgo et al, 2021 ; Timm et al, 2006 ). Significantly, these data also allow us to assess changes in individual growth rates, leading to changing secondary production.…”

Section: Introductionmentioning

confidence: 99%

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Declines in freshwater mussel density, size and productivity in the River Thames over the past half century

Ollard

Aldridge

2022

Journal of Animal Ecology

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A pioneering, quantitative study published in Journal of Animal Ecology in 1966 on freshwater mussel populations in the River Thames, UK, continues to be cited extensively as evidence of the major contribution that mussels make to benthic biomass and ecosystem functioning in global river ecosystems. Ecological alteration, as well as declines in freshwater mussel populations elsewhere, suggest that changes to mussel populations in the River Thames are likely to have occurred over the half century since this study. We resurveyed the site reported in Negus (1966) and quantified the changes in mussel population density, species composition, growth patterns and productivity. We found large declines in population density for all unionid species. The duck mussel Anodonta anatina decreased to 1.1% of 1964 density. The painter's mussel Unio pictorum fell to 3.2% of 1964 density. The swollen river mussel Unio tumidus showed statistically nonsignificant declines. In contrast to 1964, in 2020 we found no living specimens of the depressed river mussel Pseudanodonta complanata (classified as Vulnerable by the IUCN Red List) but found new records of the invasive, nonnative zebra mussel Dreissena polymorpha and Asian clam Corbicula fluminea. Additionally, we found strong decreases in size‐at‐age for all species, which now grow to 65–90% of maximum lengths in 1964. As a result of reduced density and size, estimated annual biomass production fell to 7.5% of 1964 levels. Since mussels can be important to ecosystem functioning, providing key regulating and provisioning services, the declines we found imply substantial degradation of freshwater ecosystem services in the River Thames, one of the UK's largest rivers. Our study also highlights the importance to conservationists and ecologists of updating and validating assumptions and data about wild populations, which in the present era of anthropogenic ecosystem alteration are undergoing significant and rapid changes. Regular population surveys of key species are essential to maintain an accurate picture of ecosystem health and to guide management.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Declines in freshwater mussel density, size and productivity in the River Thames over the past half century

Ollard

Aldridge

2022

Journal of Animal Ecology

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Seeökosysteme V: Synökologie (Teil 1)

Geller¹,

Hupfer²

2021

Handbuch Angewandte Limnologie: Grundlagen ‐ Gewässerbelastung ‐ Restaurierung ‐ Aquatische Ökotoxikologie ‐ Bewertung ‐ Gewäss

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Climate-related changes during the Late Glacial and early Holocene in northern Poland, as derived from the sediments of Lake Sierzywk

2011

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Reconstruction of past climate change and ecosystem response is important to correctly assess the impacts of global warming. In this study, we provide a paleoenvironmental record of in-lake and catchment changes in northern Poland during the Late Glacial and early Holocene using various biotic proxies (pollen, macrofossils and Cladocera) preserved in the lake sedimentary record. Chronology was derived from palynological correlation with a well-dated pollen sequence from nearby-lying Lake Ostrowite and some well-dated events of vegetation history in Central Europe. Pollen analysis provided information on regional climate change affecting vegetation dynamics, whereas macrofossils supplied substantial information on the response of local flora and fauna to climatic, geomorphological and limnological changes. Data were supplemented by analysis of Cladocera remains, which are of special importance because of their quick response to changes in trophic conditions and climate (especially temperature). The bottom of the sediment core reflects an initial stage of the lake formed during the late Alleröd. The Younger Dryas cooling apparently resulted in forest recession and presence of cold tolerant Cladocera species. Due to amelioration of climate at the end of the Younger Dryas and melting of ice, the lake deepened. The beginning of the Holocene was characterised by forest shrinkage and induced clear changes in local flora and fauna communities. The regional vegetation development deduced from the lake's core is generally consistent with the vegetation history of central Europe. Due to the location of the site near the seashore (oceanic climate and western wind), signals of warming came earlier than inland and in eastern Poland.

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Effects of long-term non-point eutrophication on the abundance and biomass of macrozoobenthos in small lakes of Estonia

Cited by 8 publications

References 16 publications

Declines in freshwater mussel density, size and productivity in the River Thames over the past half century

Declines in freshwater mussel density, size and productivity in the River Thames over the past half century

Seeökosysteme V: Synökologie (Teil 1)

Climate-related changes during the Late Glacial and early Holocene in northern Poland, as derived from the sediments of Lake Sierzywk

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