Forest drainage: a threat to benthic biodiversity of boreal headwater streams?

Vuori, Kari-Matti; Joensuu, Ilona; Latvala, Jyrki; Jutila, Eero; Ahvonen, Anssi

doi:10.1002/(sici)1099-0755(1998110)8:6<745::aid-aqc310>3.0.co;2-x

Cited by 41 publications

(17 citation statements)

References 32 publications

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“…Since the aquatic effects of ditch cleaning/supplementary ditching are similar to those of first-time drainage (Manninen 1998), in the (near) future there will be a continuous supply of additional alkalinity from the forested areas. However, while pushing the pH towards more neutral values, the forest-ditching operations have several other clearly negative aquatic and ecological impacts (Heikurainen et al 1978, Vuori et al 1998, Ahtiainen and Huttunen 1999, Joensuu et al 1999) and can therefore not be recommended as an acid-combating tool.…”

Section: The Futuresupporting

confidence: 91%

pH of streams in western Finland - a perspective from the Middle Ages into the mid 21st century

Åström¹,

Sundström²,

Holmberg³

2008

AFSci

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In the central parts of western Finland, many streams are severely acidified as a result of land-use activities on overburden (soils) capable of producing and ultimately releasing extreme acidity. Consequently, the extent of the acidification problem is likely to have varied over time in response to the type and extent of contemporary land use. In this study, we have combined historical information on land use and knowledge on hydrogeochemical processes in order to assess the pH declines that are likely to have occurred in streams in this area since the Middle Ages. The results show that among several potentially acidifying activities, reclamation of mires for farmland (19th and 20th centuries) and subsurface drainage of acid sulphate soils (post-war times) are the major causes of the pH decline. Recent methods developed to combat the acidification and possible future changes in pH are discussed.

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Section: The Futuresupporting

confidence: 91%

pH of streams in western Finland - a perspective from the Middle Ages into the mid 21st century

Åström¹,

Sundström²,

Holmberg³

2008

AFSci

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“…Artificial peatland drainage to improve forest growth is a common practice in Finland (Vuori et al. ) and several other European countries (Holden et al. ).…”

Section: Methodsmentioning

confidence: 99%

Phylogenetic clustering of fungal communities in human‐disturbed streams

et al. 2016

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Phylogenetic community structure is increasingly used to examine community assembly, but the influence of anthropogenic disturbance on phylogenetic community structure remains little explored. We examined how land‐use disturbance (forestry and agriculture) and naturally harsh environmental conditions (geologically driven acidity) affect the phylogenetic diversity of stream fungi. Using DNA from decomposing alder leaves, we calculated phylogenetic distances among fungal operational taxonomic units (OTUs). Closely related OTUs co‐occurred more often than expected by chance, but partitioning the relationship between phylogeny and niche differences showed evidence for niche conservatism only at short phylogenetic distances. Communities in human‐disturbed streams were phylogenetically clustered, whereas they were over‐dispersed in circumneutral near‐pristine streams. OTU richness did not decrease with disturbance; instead, some fungal taxa were replaced by closely related, more tolerant taxa. Fungal communities in naturally acidic reference streams also showed a tendency toward phylogenetic clustering, although much less so than in disturbed streams. Our results indicate different coexistence mechanisms in different environmental settings and a strong role for anthropogenic disturbance as a selective filter shaping the phylogenetic structure of instream fungal communities. The effects of human disturbances on the phylogenetic community structure of fungi occurred independently of taxonomic structure, suggesting utility of phylogenetic approaches to bioassessment.

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“…Because the catchments of these streams included only forest and marshland, the negative effect of peatland alone may also explain this relationship. Vuori, Joensuu, Latvala, Jutila & Ahvonen (1998) found a negative correlation between water pH and peatland abundance in catchments draining troutless streams. The impact of polyhumic water on fish may be caused by episodes of low pH and high concentrations of iron and aluminium, which may be detrimental to the reproduction of trout (Vuorinen et al .…”

Section: Discussionmentioning

confidence: 97%

“…1998). Because the lowest pH values often occur during the spring flood (Vuori et al . 1998), in streams where trout populations still exist the impact of acid water may be expressed indirectly by the proportion of peatland rather than directly by pH values measured in summer.…”

Section: Discussionmentioning

confidence: 99%

Instream and catchment characteristics affecting the occurrence and population density of brown trout, Salmo trutta L., in forest brooks of a boreal river basin

Jutila¹,

Ahvonen²,

Julkunen³

2001

Fisheries Management Eco

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The occurrence and density of ≥ 1+ brown trout, Salmo trutta L., and their relationship with prevailing instream and catchment characteristics were studied in 50 small forest streams, partially dredged for forest ditching. The occurrence of trout at a stream site was largely determined by the abundance of pools, size of upper catchment and water pH. Moreover, at sites where trout occurred, the abundance of pools was lower at dredged locations than at those in a natural state. In riffles in a natural state, there was a positive relationship between trout density and three instream variables: the abundance of stream pools, cascades and instream vegetation, while an inverse relationship was found with the abundance of substratum of 2–10 cm in diameter. Of the catchment variables, correspondingly, the proportion of forest in the upper catchment was positively related and the proportion of peatland negatively related to trout density. No significant regression model could be fitted for dredged riffles. The possibility of enhancing trout populations in dredged riffles is discussed.

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Forest drainage: a threat to benthic biodiversity of boreal headwater streams?

Cited by 41 publications

References 32 publications

pH of streams in western Finland - a perspective from the Middle Ages into the mid 21st century

pH of streams in western Finland - a perspective from the Middle Ages into the mid 21st century

Phylogenetic clustering of fungal communities in human‐disturbed streams

Instream and catchment characteristics affecting the occurrence and population density of brown trout, Salmo trutta L., in forest brooks of a boreal river basin

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