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Bryophyte community assembly on young land uplift islands: dispersal and habitat filtering assessed using species traits
Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences. (Landskapsekologi)ORCID iD: 0000-0002-7513-1617
Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences. (Landskapsekologi)
Artdatabanken, Sverige Lantbruksuniversitet, Uppsala.
Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences. (Landskapsekologi)
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2019 (English)In: Journal of Biogeography, ISSN 0305-0270, E-ISSN 1365-2699Article in journal (Refereed) Epub ahead of print
Abstract [en]

Aim: To assess habitat filtering and dispersal limitation in spore plant community assembly using bryophytes on recently emerged land uplift islands as study system. Location Gulf of Bothnia, northern Europe. Taxa Bryophytes, including the spore plant phyla Bryophyta (mosses) and Marchantiophyta (liverworts).

Methods: The species compositions of 20 coastal land uplift islands differing in age, area, connectivity and habitat composition were recorded in the field. In addition, we compiled a list of the regional species pool (446 species) and gathered data on species traits related to habitat affiliations (substrate, light, moisture, and pH) and dispersal capacity (regional abundance, spore size, sporophyte frequency, sexual system, vegetative propagules). For the 420 species with available trait data, we used multivariate generalized linear models to compare trait effects on species occurrence probabilities on the islands.

Results: Occurrence probabilities depended strongly on habitat affiliations. In addition, occurrence probabilities were lower for predominantly asexual species than for sexual species and for regionally rare than for regionally abundant species. Having specialized asexual propagules increased occurrence probabilities, but compensated only partly for the reductions in asexual species. No effect of the size of sexually produced spores was detected. Comparison of trait effects across island size and connectivity gradients revealed (a) reduced habitat filtering on larger islands and (b) decreasing negative effects of being predominantly asexual with increasing island connectivity.

Conclusions: Both habitat filtering and dispersal capacities affect the community assembly of spore plants on land uplift islands. Asexual mosses and liverworts show landscape scale (<= 10 km) dispersal limitation. The weak or absent relationships between island connectivity and the effects of dispersal traits suggest that colonization is regulated mainly by habitat availability and the abundance of each species in a "regional spore rain" from which colonists are recruited.

Place, publisher, year, edition, pages
John Wiley & Sons, 2019.
Keywords [en]
colonization, community assembly, dispersal limitation, habitat availability, liverworts, mosses; reduced rank vector generalized linear models, sporophytes, trait based community ecology, vegetative propagules
National Category
Ecology
Research subject
Ecological Botany; Conservation Biology
Identifiers
URN: urn:nbn:se:umu:diva-121236DOI: 10.1111/jbi.13652ISI: 000481048700001OAI: oai:DiVA.org:umu-121236DiVA, id: diva2:932304
Funder
Swedish Research Council Formas, 215-2010-998
Note

Originally published in thesis in manuscript form.

Available from: 2016-06-01 Created: 2016-05-30 Last updated: 2019-09-06
In thesis
1. Island biogeography of young land uplift islands - viewed through the lens of bryophytes in a northern Swedish archipelago
Open this publication in new window or tab >>Island biogeography of young land uplift islands - viewed through the lens of bryophytes in a northern Swedish archipelago
2016 (English)Doctoral thesis, comprehensive summary (Other academic)
Alternative title[sv]
Öbiogeografi hos unga landhöjningsöar - betraktad ur ett mossperspektiv.
Abstract [en]

Increasing habitat fragmentation and rapid global warming is changing the conditions for species populations and ecological communities around the world. This presents challenges for the maintenance of biodiversity and a dominant paradigm for conservation in fragmented habitats is given by island biogeography and metapopulation (or metacommunity) ecology.

In this thesis I approach key concepts (area, connectivity and community assembly) in island biogeography and metacommunity ecology within the context of a dynamic land uplift archipelago. The presented work consists of two interwoven themes: (i) A methodological theme in which statistical approaches are developed to deal with the complexities of multispecies dynamic systems, and (ii) an applied theme dealing with community assembly and island biogeography of bryophytes on young land uplift islands.

To describe island connectivity for entire species assemblages, an approach using functional principal component analysis (fPCA) on patch connectivity functions (the connectivity of an island as a continuous function of a variable representing the spatial scale of species dispersal capacities) was developed. In addition, a new statistical method, functional co-inertia analysis (fCoIA), for analyzing co-variation between multivariate species data and continuous functions was developed and applied to the relation between bryophyte species incidences and the island age/area-dynamics.

Primarily asexual bryophyte species are dispersal limited and presence probabilities are related to island connectivity. No such patterns were found for species, at least occasionally, producing spores. Our results suggest that bryophyte dispersal is regulated by the contribution of spores to a regional spore rain and that bryophyte species with low spore output at the landscape level may be extra vulnerable under habitat fragmentation and loss. Having specialized asexual propagules increases the presence probabilities on islands, partly compensating for the dispersal limitation in asexual species. This suggests a trade-off between dispersal and establishment capacity, but also points to the importance of local dispersal for maintaining populations under the succession driven spatial turnover of microsites on the islands. Bryophyte colonization is strongly limited by habitat availability when a given habitats is rare, but there seems to exist a threshold over which other processes (e.g. dispersal limitation) become more important. Species with more vagile life history strategies appear to be stronger affected by the area of available habitats than many perennial species

Place, publisher, year, edition, pages
Umeå: Umeå University, 2016. p. 59
Keywords
functional data analysis, metacommunity, isolation, mosses, liverworts, sporophyte production, dispersal-establishment trade-off
National Category
Ecology Botany Probability Theory and Statistics
Research subject
Ecological Botany; Conservation Biology; Statistics
Identifiers
urn:nbn:se:umu:diva-121239 (URN)978-91-7601-495-0 (ISBN)
Public defence
2016-09-23, Björken, Sveriges Lantbruksuniversitet, Umeå, 09:00 (English)
Opponent
Supervisors
Funder
Swedish Research Council Formas, 215-2010-998
Available from: 2016-06-03 Created: 2016-05-30 Last updated: 2018-06-07Bibliographically approved

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Karlsson Tiselius, AndreasJansson, RolandDynesius, Mats

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