Natuurmuseum Nijmegen

Nijmegen, Netherlands

Natuurmuseum Nijmegen

Nijmegen, Netherlands

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Gonzalez-Mancebo J.M.,University of La Laguna | Dirkse G.M.,Natuurmuseum Nijmegen | Patino J.,University of La Laguna | Patino J.,University of Liège | And 4 more authors.
Biodiversity and Conservation | Year: 2012

The International Union for Conservation of Nature (IUCN) Red List categories and criteria were applied to small-sized spore-producing plants with high dispersal capacities (bryophytes). The application of some of the IUCN criteria to bryophytes in small and highly environmental diverse islands implies several problems. The criteria applicability increases when the occupancy area is reduced. However, for common species restricted to a single type of vegetation belt, the use of the IUCN criteria is problematic because of inapplicable and/or misleading thresholds. We adapted the IUCN criteria by modifying the occupancy and occurrence area sizes and by specifying the location. This approach allowed us to establish the first Red List for the bryophyte species in the Canaries, which comprises 105 species (67 mosses and 38 liverworts); among them, 7 are critically endangered, 20 are endangered and 78 are vulnerable. Twenty-six species were classified as near-threatened, 245 were considered to be at low risk and 125 were data deficient (DD). Among the DD ones, 19 corresponded to newly reported species (DD-n) and 40 had no records during the last 30 years (DD-va). Our findings show that the freshwater habitats as well as the habitats in the most restricted cloud forests (with Erica platycodon) contain the majority of the threatened species, followed by other types of laurel forests and high mountain habitats. © 2012 Springer Science+Business Media Dordrecht.


Dirkse G.M.,Natuurmuseum Nijmegen | Losada-Lima A.,University of La Laguna | Stech M.,Naturalis Biodiversity Center | Stech M.,Leiden University
Journal of Bryology | Year: 2016

A morpho-molecular study was undertaken to solve the taxonomic identity of Riccia plants from the Canary Islands. These plants were assumed to belong to the South African endemic Riccia section Pilifer, but could not be assigned to a particular species in that section. In the interim they were named R. lamellosa (section Riccia), since R. lamellosa is the only European species with conspicuous white ventral scales. Molecular phylogenetic reconstructions based on trnL-F and ITS2 sequences confirmed that the respective Riccia plants belong to section Pilifer. The respective clade is clearly separated from the clades of R. lamellosa and R. elongata, the latter being morphologically most similar within section Pilifer. Based on the combined molecular and morphological evidence the Riccia plants from Canary Islands are described as a new species, R. boumanii, which represents the first species of section Pilifer outside South Africa. Based on revised herbarium specimens, R. boumanii occurs on five islands of the Canary Islands archipelago, namely El Hierro, Gran Canaria, La Gomera, La Palma, and Tenerife. © 2016, © British Bryological Society 2016.


Dirkse G.M.,Natuurmuseum Nijmegen | Losada-Lima A.,University of La Laguna
Cryptogamie, Bryologie | Year: 2011

We provide first Canary Islands reports of Diphyscium foliosum (Hedw.) D. Mohr, Entosthodon longicolle (Trab.) Ros et M.J. Cano, Tortella alpicola Dixon and T. bambergeri (Schimp.) Broth., being the last three also new to Macaronesia. First individual island reports are given for Acaulon mediterraneum Limpr. (Gran Canaria, Tenerife), and Tortella limbata (Schiffn.) Geh. et Herzog (Tenerife). Brief taxonomic notes are added. Entosthodon fascicularis (Hedw.) Müll. Hal. is removed from the list of Fuerteventura and Tortella fragilis (Hook. Wilson) Limpr. from the list of the Canary Islands. © 2011 Adac. Tous droits réservés.


Dirkse G.M.,Natuurmuseum Nijmegen | Losada-Lima A.,University of La Laguna
Journal of Bryology | Year: 2011

We revised both the holotype and an isotype of Riccia teneriffae S.W.Arnell 1962 and additionally revised our own collections of Riccia cavernosa Hoffm. 1795 from the Canary Islands. Since the types of R. teneriffae represent R. cavernosa, and the latter name precedes the former, R. teneriffae should be treated as a synonym of R. cavernosa. In the Canary Islands, R. cavernosa appears to be rare. It has been found on La Gomera, Gran Canaria, Lanzarote, and Tenerife. We report it as new to Fuerteventura. R. cavernosa inhabits ephemeral, thin layers of mud. Very rarely it occurs on basaltic pyroclasts. SEM images of spores are presented. The local distribution is mapped. © British Bryological Society 2011.


Patino J.,University of Liège | Patino J.,University of The Azores | Patino J.,University of La Laguna | Bisang I.,Swedish Museum of Natural History | And 6 more authors.
Journal of Ecology | Year: 2013

Summary: The evolution of island syndromes has long served as a model to understand the mechanisms accounting for phenotypic differentiation. Combining literature data with actual observations, we determine whether typical syndromes such as the loss of dispersal power and the bias towards self-compatibility (Baker's law) apply to vagile organisms, using bryophytes as a model. The life-history traits (LHTs) observed in oceanic island floras were statistically different from those observed on continents, evidencing the evolution of island syndromes. In contrast, LHTs of continental and continental island floras were similar, pointing to differences in migration intensity between continents, continental islands and oceanic islands. The proportion of bisexual species was significantly higher on oceanic islands than on continents. A significant proportion of species that are unisexual or bisexual on continents shifted towards exclusive bisexuality on oceanic islands, suggesting that Baker's law applies to bryophytes. The underlying mechanisms, however, probably differ from in situ selection for selfing. The proportion of species producing specialized asexual diaspores, which are assumed to play a role in short-distance dispersal (SDD), was higher on oceanic islands than on continents. The proportion of species producing spores, which are involved in long-distance dispersal (LDD), exhibited the reverse trend, suggesting a shift in the prevalent reproductive strategy to favour SDD on oceanic islands. Approximately 50% of the species, however, maintained the ability to produce sporophytes on oceanic islands, and the relative frequency of fertile shoots within collections of four model species was even higher on islands than on continents. Synthesis. Bryophytes exhibit typical island syndromes, indicating that migration rates between oceanic islands and continents are not sufficient to prevent the effects of genetic drift and contradicting the view that the sea does not impede migration in the group. Significant shifts in life-history traits (LHTs) towards increased production of specialized asexual diaspores and decreased sporophyte production on oceanic islands indeed point to a global loss of long-distance dispersal (LDD) ability. The maintenance of traits characteristic for LDD in a large number of species has, however, substantial consequences for our understanding of island plant evolution, and in particular, for our vision of islands as evolutionary dead ends. © 2013 British Ecological Society.


Ros R.M.,University of Murcia | Mazimpaka V.,Autonomous University of Madrid | Abou-Salama U.,Ain Shams University | Aleffi M.,University of Camerino | And 29 more authors.
Cryptogamie, Bryologie | Year: 2013

The names of all mosses published up to the end of August 2011 in the countries of the Mediterranean basin, the Macaronesian Islands and Bulgaria are compiled in an annotated checklist. The list comprises accepted names and synonyms, and provides explanatory annotations for ambiguous and disputed names. Literature references supporting the reports in each individual area are given only for taxa reported once or in a single locality. A total of 1168 accepted species and 81 infraspecific taxa are reported from the whole area.


Dirkse G.M.,Natuurmuseum Nijmegen | Losada-Lima A.,University of La Laguna
Journal of Bryology | Year: 2010

Based on a revision of Andreaea from the Canary Islands, the occurence of two species is confirmed. A key is provided. A. crassifolia Luisier occurs on Gran Canaria, La Palma and Tenerife. A. heinemannii Hampe & Müll.Hal. occurs on La Palma. Former records of A. heinemannii s.l. for Gran Canaria and Tenerife refer to A. crassifolia. © 2010 British Bryological Society.


Van Loon-Steensma J.M.,Wageningen University | Van Dobben H.F.,Wageningen University | Slim P.A.,Wageningen University | Huiskes H.P.J.,Wageningen University | Dirkse G.M.,Natuurmuseum Nijmegen
Applied Vegetation Science | Year: 2015

Question: Do low stone dams built to prevent erosion and to restore salt marshes through increased sedimentation affect plant species composition? Location: Dutch Wadden Sea area (ca. 53°N 5°E). Methods: Relevés (N = 170) were made of the vegetation of two restored salt marsh sites on the barrier islands Terschelling (Grië) and Ameland (Neerlands Reid). Existing relevés of salt-marsh vegetation (N = 6198) made along the entire Dutch Wadden Sea coast (both the mainland and the barrier islands) were used as a reference. The vegetation of the two restored sites (Grië NLR data) was compared with the reference by (1) simple species-by-species analysis based on frequencies in both data sets, and by (2) ordination, where relevés of the restored sites were projected into a multivariate space defined by the species' abundances in the reference relevés. Results: Out of the 37 species that are common (i.e. have a frequency >5%) in either the Grië NLR data or the reference data, 31 have frequencies that differ by less than a factor of five, and 23 differ by less than a factor of two. Furthermore, the Grië NLR data occupy a space that is well in the centre of the ordination space defined by the reference data. Conclusions: There are no conspicuous differences between salt-marsh vegetation behind low dams and the vegetation that has naturally developed on unprotected mudflats. We conclude that measures targeting salt marsh development in view of flood protection do not interfere with nature conservation. © 2015 International Association for Vegetation Science.


Dirkse G.M.,Natuurmuseum Nijmegen | Brugues M.,Autonomous University of Barcelona
Journal of Bryology | Year: 2010

A new species Entosthodon kroonkurk sp. nov. is described and figured. It is most similar to E. pulchellus (Philibert) Brugués, from which it differs in duller and squarrosely recurved leaves when dry, a narrower nerve, and spores which are discoid and collapse when dry. It is very rare in the Iberian Peninsula (Catalunña, Gerona) but common in the Canary Islands, where it occurs mainly below 400 m alt. in S parts of Gran Canaria, Hierro, La Palma, Tenerife. A key to related Canarian species is provided. © 2010 British Bryological Society.


Dirkse G.,Natuurmuseum Nijmegen | Zonneveld B.,Naturalis Biodiversity Center | Duistermaat L.,Naturalis Biodiversity Center
Gorteria: Tijdschrift voor Onderzoek aan de Wilde Flora | Year: 2015

Since a few years, a winter-flowering, almost glabrous and small-flowered Cardamine is encountered that cannot be identified with regional floras. This form lacks a leaf rosette, has flowers with 6 anthers, and leaves without auricles. Flowcytometric analysis reveals that it is not one of the species or hybrids known from our country. Our conclusion is that the plants belong to the Asian octoploid species Cardamine hamiltonii G.Don. We discuss taxonomy and nomenclature of this species. Its introduction seems to be a recent development, and can be traced back to the import of bonsai plants in which pots the species has been found several times as a weed. © 2015, Nationaal Herbarium Nederland. All rights reserved.

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