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Povzetek: Fenološka opazovanja dreves v gozdovih so pomemben vir podatkov za ugotavljanje vpliva podnebnih sprememb na gozdove in druge naravne ekosisteme. V naši raziskavi smo analizirali nastop fenoloških faz prvih listov in iglic ter splošnega rumenenja listov za listavce ter dolžino vegetacijskega obdobja na osmih ploskvah intenzivnega monitoringa gozdnih ekosistemov v Sloveniji. Obravnavali smo drevesne vrste bukev, dob, rdeči bor, črni bor in smreko v letih od 2004 do 2023. Ugotavljamo, da je nastop fenološke faze prvih listov na večini ploskev zgodnejši kot pred leti. Značilno zgodnejši nastop fenološke faze prvih iglic med leti smo ugotovili tudi za rdeči bor na ploskvi Brdo in črni bor na ploskvi Gropajski bori. Pri bukvi smo ugotovili značilne razlike med ploskvami. Nastop fenološke faze prvih listov bukve je bil najkasnejši na ploskvah Lontovž in Gorica, medtem ko je bil na ploskvah Fondek in Borovec v povprečju sočasen. Za fenološko fazo splošnega rumenenja listov pri bukvi so razlike med ploskvami manjše kot pri fenološki fazi prvih listov. Naši rezultati na ploskvah Borovec, Fondek in Gorica nakazujejo daljšanje vegetacijskega obdobja, pri čemer je na ploskvi Gorica daljšanje dolžine vegetacijskega obdobja manj izrazito in ni statistično značilno.
Ključne besede: gozdovi, fenologija, gozdna drevesa, intenzivno spremljanje stanja gozdov, Slovenija
Objavljeno v DiRROS: 06.12.2024; Ogledov: 84; Prenosov: 29
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Objavljeno v DiRROS: 06.12.2024; Ogledov: 90; Prenosov: 8261
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Povzetek: Although the activities of various tree organs and tissues are under different environmental and internal constraints, they need to be coordinated to ensure whole-tree functioning. Dusart et al. (2024) conducted a heating experiment on branches of Juglans regia saplings during the entire growing season to examine the effect of temperature on primary (bud) and secondary (xylem) growth. They found that primary and secondary meristems responded asynchronously to elevated temperature, which suggests that lack of coordination mechanisms between primary and secondary growth at crown scale could have a potential impact on canopy and tree architecture.
Ključne besede: phloem, wood anatomy, tree growth, angiosperms, bark, meristem, non-structural carbohydrates, primary growth, radial growth, secondary growth, temperature, xylem
Objavljeno v DiRROS: 05.12.2024; Ogledov: 94; Prenosov: 53
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Povzetek: Objective: Parkinson’s patients will experience mobility disturbances with disease progression. Beneficial effects of physical therapy are short-lasting. Novel interventions are needed to maintain these benefits. Methods: Fourteen Parkinson’s patients (71±4.08 years) participated in a randomized controlled examiner-blinded feasibility clinical trial. After 12 physical therapy sessions, the intervention group received a height-adjustable desk that facilitates stepping while standing, for 4 months. Explorative outcome measures included MDS-UPDRS II, III, TUG, 8.5m walking test, PDQ-39, sABC, sFES, DEXA scans, and lower extremity strength. Results: Post-physical-therapy, everyone significantly improved on the MDS-UPDRS II, III, TUG, and 8.5m walking test, and PDQ-39. (p<0.05) After 4 months, the control group regressed towards pre-physical-therapy values. In the intervention group, sedentary behavior decreased beyond desk use, indicating a carry-over effect. MDS-UPDRS II, PDQ-39, sFES, sABC, TUG, 8.5m walking test, activity time, sitting time, hip strength all improved with clinically relevant effect sizes. Conclusion: Postphysical therapy in-home reduction of sedentary behavior was associated with maintenance of physical benefits and additional improvements in mobility, activity time, balance and quality of life
Ključne besede: Parkinson’s disease, physical therapy, sedentarism, sarcopenia, quality of life
Objavljeno v DiRROS: 05.12.2024; Ogledov: 87; Prenosov: 44
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Povzetek: Field crickets (Gryllidae) produce sounds by tegminal stridulation, well-studied for its role in female attraction and choice. However, understanding female preferences for their courtship song remains elusive, despite considering additional chemical, visual, and thermal signals. Beyond stridulation, crickets also display vibrational courtship behaviours that remain largely unexplored. Using Acheta domesticus as a model, we conduct the first comprehensive analysis of the entirety of vibroacoustic courtship signals in crickets, including their interaction. Employing audio recording, laser vibrometry, and videorecording, we unveil a complex signal involving simultaneous wing stridulation, body tremulation, and leg drumming against the substrate in a prolonged display, unique among insects. We identify robust correlations, coupling, and coordination between these signal components. We show the tightest coupling between the two types of stridulation pulses, and between tremulation and drumming signals, while drumming-stridulation coupling is less consistent, revealing a constraint on drumming performance. This constraint in the expression of one signal component, without a trade-off, represents a specific case within complex dynamic signalling. In addition, we find no correlation between drumming rate and its accuracy relative to stridulation, challenging common expectations. Our findings indicate that the information conveyed by the complex courtship display in A. domesticus is not simply proportional to that in the song, shedding light on previous ambiguities surrounding its function. Spectral-intensity analysis indicates the closest perceptual connection between stridulation and drumming signals, likely commonly influencing female choice, while proposing another function for tremulation. Further research should delve deeper into the function of this intricate signal.
Ključne besede: male quality, substrate vibration, sound, complex signal, dynamic signal, insects, zoology, biology
Objavljeno v DiRROS: 04.12.2024; Ogledov: 93; Prenosov: 943
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