Luke
Silmäile
Hakuohjeet

Jukuri

Tervetuloa käyttämään Jukuria, Luonnonvarakeskuksen (Luke) avointa julkaisuarkistoa. Jukurissa on tiedot Luken julkaisutuotannosta. Osa julkaisuista on vapaasti ladattavissa. Luken muodostaneiden tutkimuslaitosten aikaisemmasta julkaisutuotannosta osan tiedot ovat järjestelmässä jo nyt ja kattavuus paranee jatkuvasti.

Kokoelmat

Viimeksi tallennetut

  • Nocturnal soil-surface behaviour of a giant earthworm in the Black Forest, SW Germany
    Butt, Kevin R.; Lang, Friederike; Ehrmann, Otto; Healey, Rick; Nuutinen, Visa
    European journal of soil biology (Elsevier, 2026)
    The behaviour of the large, deep burrowing earthworm Lumbricus badensis, endemic to the southern Black Forest, was studied in its natural beech and spruce dominated forest habitat. Using night vision cameras, nocturnal activities at the soil surface were recorded of adult individuals, over six consecutive nights in early summer. Behaviour consisted of sub-midden activity (near-surface, worm unseen), foraging, and mating, which accounted for 60, 34 and 6% of activity, respectively. Less than 1% of activity was over surface dispersal. Sub-midden activity, likely consisting of litter incorporation, feeding and casting, usually started before all others and continued throughout the night. This activity may relate to the role of the midden as an external rumen where the incorporated, initially recalcitrant, litter becomes more palatable. Foraging started later in the night, and apart from collection of and feeding on small litter items, it also involved displacement of large objects such as spruce cones. Surface litter samples collected from paired areas of high- and low-density L. badensis showed that higher density areas contained significantly less beech leaves and woody litter. The five recorded mating events all occurred after midnight and involved pre-copulatory exploratory behaviour. Mating itself was unlike that previously reported for earthworms and involved no mutual ventral alignment and long-lasting close contact. Instead, individuals attached in turns to the partner's clitellar region with anterior segments and only for a short period, with an equally short intervening period between the two attachments. This unexpected observation warrants further in-depth study. Rainfall was shown to interrupt aboveground activity, which may also be reduced on cloudless, moon-lit nights. With climate change already affecting Black Forest ecology and the indications of detrimental effects of increasing summer droughts on L. badensis juveniles, there is some urgency to better understand the environmental controls and conservation needs of this enigmatic ecosystem engineer.
  • Does hunting-mortality risk affect landscape connectivity? Insights from brown bear movement ecology
    Falcinelli, Daniele; Ciucci, Paolo; del Mar Delgado, María; Kojola, Ilpo; Heikkinen, Samuli; Kopatz, Alexander; De Angelis, Daniele; Penteriani, Vincenzo
    Biological conservation (Elsevier, 2026)
    Landscape connectivity supports key ecological processes of animal populations by enabling movement and ensuring gene flow. Habitat corridors are crucial for facilitating connectivity but may expose transient individuals to high mortality risk in human-modified landscapes. Historically, intense hunting led to fragmentation of Scandinavian and Karelian brown bear Ursus arctos populations in Fennoscandia. Currently, the Finnish-Russian Karelian population is managed through legal hunting and shows limited gene flow toward the Scandinavian peninsula (Sweden and Norway). Using a two-dimensional modelling framework and long-term datasets, here we assessed landscape connectivity in the Karelian population range and whether hunting-related mortality risk affects intra-population connectivity toward Scandinavia. First, we used GPS data (2002–2014) from 37 bears to perform a step-selection analysis, derive a resistance surface, and model connectivity by circuit theory across Finland and Russian Karelia. Next, we used Finnish bear harvest data (1174 locations, 2002–2014) and resource selection functions to model hunting-mortality risk across Finland, which we integrated with previously identified corridors. Connectivity was highest in forests along central-eastern Finland, southern Finnish-Russian border, and southern Russian Karelia, while it was limited in the northern Finnish reindeer husbandry region, probably due to higher cover of shrubland/open areas. Hunting-mortality risk was highest throughout central-eastern Finland. About 44% of Finland's corridor area fell within high-risk zones, which may potentially constrain connectivity to Scandinavia by acting as functional barriers. To enhance connectivity with Scandinavia, conservation actions in Finland should minimise forest fragmentation and decrease hunting pressure, e.g., within corridors and by protecting females with offspring and solitary subadults.
  • Kalastus ja norpansuojelu - tutkimusta yhteensovittamisen taustaksi
    Keskinen, Tapio; Hopkins, Juhani; Rahikainen, Mika
    Suomen kalastuslehti : 2 (Kalatalouden Keskusliitto, 2026)
  • Biopeitto Kainuu - Lahnaslammen sivukivikasan peittorakenne ja ympäristönseurantajärjestelmä
    Pietilä, Raija; Karlsson, Teemu; Kupila, Juho; Valpola, Salla; Ikkala, Lauri; Maanavilja, Liisa; Toivanen, Joonas; Lötjönen, Timo
    GTK:n työraportti : 17/2026 (Geologian tutkimuskeskus, 2026)
  • Kalamarkkinakatsaus 2018
    Saarni, Kaija; Setälä, Jari; Niukko, Jari (Luonnonvarakeskus, 2019)