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- Jonsson, Bengt-Gunnar, et al.
(author)
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State of Bryophyte Ecology 2005 : the final meeting of the BRYOPLANET network held in Kéked, Hungary 19-25 August 2005
- 2006
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In: Lindbergia. - 0105-0761 .- 2001-5909. ; 31:1-2, s. 3-5
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Journal article (other academic/artistic)abstract
- BRYOPLANET, a bryophyte population and landscape analysis network, was funded by the Nordic Research Board (Nordforsk) from 2001-2005 to arrange scientific meetings, workshops and courses for researchers and students on bryophyte ecology in the Nordic and Baltic countries. It provided a tool for connecting bryologists in the region and elsewhere. The network succeeded in connecting experienced reserachers’ broad knowledge with young enthusiastic post-graduate students with fresh ideas. In the final meeting of the network in Kéked, Hungary on 19-22 August 2005 and during the post-meeting excursion on 22-25 August, 2005, the present state of research was discussed with strong emphasis on identifying the highlights and also the weaknesses in the many fields of bryophyte ecology today. The meeting consisted of seven invited retrospective lectures, offered by specialists in different fields of bryophyte ecology, and reserachers and students had an opportunity to present ongoing projects to the audience. In addition to the lectures, the meeting consisted of 15 presentations ranging from phylogeographic patterns to morphological adaptations, population dynamics and genetics. Retrospective lectures have been published, along with some of the original papers presented at the Kéked meeting. This introduction presents and evaluates the history, aims and outcomes of the BRYOPLANET network in addition to reporting on the final meeting in Kéked.
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- Jägerbrand, Annika, 1972-
(author)
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Dead or alive? : Testing the use of C:N ratios and chlorophyll fluorescence in vertical shoot profiles to determine depth of vitality and point of senescence in populations of bryophytes
- 2015
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In: Lindbergia. - : THE NORDIC AND DUTCH BRYOLOGICAL SOCIETY. - 0105-0761 .- 2001-5909. ; 38, s. 4-13
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Journal article (peer-reviewed)abstract
- Bryophytes with indeterminate growth rarely exhibit clearly identifiable modules or age segments, but can be vertically divided into different physiologically active zones, since physiological activity normally declines vertically along the shoot profile depth. The aim of this study was to investigate whether it is possible to use C:N ratios (C/N)and/or parameters from chlorophyll fluorescence measurements (e.g. Fv/Fm, Fm or qN)to determine if bryophyte tissue is alive, senescent or dead, and at what distance along the shoot segment profile the moss tissue cease to live. Variation in C:N ratios and chlorophyll fluorescence between sites was also examined. This study shows that it is possible to separate alive, senescing and dead parts of the moss shoots in Pleurozium schreberi, and that chlorophyll fluorescence is a good method to use, whereas C/N varies between sites and species (for Hylcomium splendens and Racomitrium lanuginosum)and does not seem to reflect physiological activity to the same degree.
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- Jägerbrand, Annika K.
(author)
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Effects of an in situ temperature increase on the short-term growth of arctic-alpine bryophytes
- 2007
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In: Lindbergia. - : Nordic Bryological Society and the Dutch Bryological and Lichenological Society. - 0105-0761 .- 2001-5909. ; 32:3, s. 82-87
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Journal article (peer-reviewed)abstract
- This study examined the short-term growth responses to a temperature increase in situ of three bryophytes species of different genera. Temperatures were enhanced by the use of open-top chambers at Latnjajaure, a subarctic-alpine site in northernmost Sweden. Growth was measured during the growing season of 1995, using the tied-thread method for Aulacomnium turgidum, the cranked-wire method for Sphagnum teres, and the shoot-transplanting method for Tomentypnum nitens. Temperature enhancement significantly increased the growth in length of Sphagnum teres while no significant effects were found for the other two species. One possible reason for this is that Sphagnum teres had more water available, while the other two species could not respond to increased temperature due to constraints of water availability.
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