Urban forests host rich polypore assemblages in a Nordic metropolitan area

Korhonen, Aku; Penttilä, Reijo; Siitonen, Juha; Miettinen, Otto; Immonen, Auli; Hamberg, Leena

doi:10.1016/j.landurbplan.2021.104222

Cited by 8 publications

(4 citation statements)

References 52 publications

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“…Urban forests have been shown to be valuable habitats e.g. for polypores (Korhonen et al 2021b), but air pollution most likely diminishes the value of urban forests for lichens. Some lichen species had been observed mostly or exclusively on wooden structures in Finland (see also Svensson et al 2005).…”

Section: Habitat Typesmentioning

confidence: 99%

Habitat associations of red-listed epiphytic lichens in Finland

Nirhamo¹,

Pykälä²,

Jääskeläinen³

et al. 2023

Silva Fenn

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The Finnish red list shows that the epiphytic lichen flora of Finnish forests is highly threatened and declining steeply. Red lists provide limited information on the habitat associations of threatened species, which could be relevant in informing management and conservation measures. We used documented empirical data and expert assessments to determine for each red-listed (IUCN categories Near Threatened, NT; Vulnerable, VU; Endangered, EN; Critically Endangered, CR; Regionally Extinct, RE) epiphytic lichen species of Finland the following key habitat associations: host tree species, substrate type, habitat type, geographical distribution, preferred microclimate, and minimum required forest and tree age. The most important host tree species were Picea abies (L.) H. Karst. and Populus tremula L. Other tree species of high importance included Sorbus aucuparia L. and Salix caprea L. One fourth of red-listed epiphytic lichens were primarily lignicolous. Most species required old-growth forests (required by 41% of species) or old trees (52%), but many species required only mature forests (36%) or trees (35%). The microclimatic preferences of most red-listed epiphytic lichens consisted of high or intermediate light availability and humidity. Most species whose status had deteriorated were dependent on deciduous trees. The continuous availability of old deciduous trees (especially Populus, Salix and Sorbus) requires special attention in both managed and protected forests. Red-listed epiphytic lichens would be aided by increased forest protection or transitioning to less intensive management regimes.

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Section: Habitat Typesmentioning

confidence: 99%

Habitat associations of red-listed epiphytic lichens in Finland

Nirhamo¹,

Pykälä²,

Jääskeläinen³

et al. 2023

Silva Fenn

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“…This is especially the case in rapidly consolidating cities, where increasingly diverse expectations by a growing number of urban residents are placed on increasingly small green areas (Haaland & van Den Bosch 2015;Hansen et al, 2019). For example, UGI has been shown to, or is expected to, provide well-being and recreation for urban residents (Casado-Arzuaga et al, 2014, van den Bosch and Sang 2017, Gulsrud et al, 2018, mitigate the urban heat island effect (Gill et al, 2007;Depietri et al, 2013), and, increasingly, provide habitat for diverse species communities (Borysiak et al, 2017;Korhonen et al, 2021). However, it remains unclear how, and to what extent, managing UGI for increased carbon sequestration or storage is perceived possible, and whether this would in fact provide ecological, social, and economic co-benefits or balance trade-offs between them (Wickenberg et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Envisioning carbon-smart and just urban green infrastructure

Lampinen

García‐Antúnez

Olafsson

et al. 2022

Urban Forestry & Urban Greening

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“…Here, we focus on deadwood which has been, until recently, little studied in the urban milieu (e.g. Korhonen et al ., 2021; Meyer et al ., 2021). Decaying wood forms dynamic microhabitats and food sources that sustain approximately 20%–25% of forest species in boreal Fennoscandia (Siitonen, 2001), and wood‐inhabiting fungi (WIF) are key drivers in the wood‐decay process (Stokland et al ., 2012).…”

Section: Introductionmentioning

confidence: 99%

“…Spruce logs are also one of the main commodities of the wood industry, and therefore, only a small fraction is incorporated into the deadwood reservoirs in managed forest stands. A recent study on spruce‐inhabiting polypore diversity along an urban–rural gradient (Korhonen et al ., 2021) found that coarse woody debris in urban forests can host red‐listed species. However, their frequency in urbanized areas was still lower than expected after accounting for deadwood quantity and local‐scale forest connectivity.…”

Section: Introductionmentioning

confidence: 99%

Landscape context and substrate characteristics shape fungal communities of dead spruce in urban and semi‐natural forests

Korhonen

Miettinen

Kotze

et al. 2022

Environmental Microbiology

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Summary Urban green areas are becoming increasingly recognized for their biodiversity potential. However, little is known about how urbanization shapes cryptic species communities, such as those residing in deadwood. In this study, we investigated downed Norway spruce trunks at intermediate stages of decay, in urban and semi‐natural forests in southern Finland. To understand the interconnections between landscape context, deadwood characteristics and wood‐inhabiting fungal communities, we studied structural characteristics, surface epiphyte cover and internal moisture and temperature conditions of the tree trunks, and fungal communities residing in the wood. Our findings showed that urban tree trunks had less epiphyte cover and lower moisture than trunks in semi‐natural forests. Overall, urban forests provide less favourable habitats for a majority of the dominant wood‐inhabiting fungal species and for red‐listed species as a group. Yet, 33% of urban trunks hosted at least one red‐listed species. While these landscape‐scale effects may be driven by local climatic conditions as well as contingencies related to available species pools, our results also highlight the significance of substrate‐scale variability of deadwood in shaping wood‐inhabiting fungal communities. We show that epiphyte cover is a significant driver or indicator of these small‐scale dynamic processes in deadwood.

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Urban forests host rich polypore assemblages in a Nordic metropolitan area

Cited by 8 publications

References 52 publications

Habitat associations of red-listed epiphytic lichens in Finland

Habitat associations of red-listed epiphytic lichens in Finland

Envisioning carbon-smart and just urban green infrastructure

Landscape context and substrate characteristics shape fungal communities of dead spruce in urban and semi‐natural forests

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