Significant Habitat Loss of the Black Vanilla Orchid (Nigritella Nigra S.L
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Uniwersytet Gdaski University of Gdask https://repozytorium.bg.ug.edu. pl Significant habitat loss of the black vanilla orchid (Nigritella nigra s.l., Orchidaceae) and Publikacja / shifts in its pollinators availability as results of global warming, Publication Kolanowska Marta, Rewicz Agnieszka, Nowak Sawomir DOI wersji wydawcy / http://dx.doi.org/10.1016/j.gecco.2021.e01560 Published version DOI Adres publikacji w Repozytorium URL / https://repozytorium.bg.ug.edu.pl/info/article/UOG2ae4b8dd19b94d7c91e5f64aea8de4a9/ Publication address in Repository Data opublikowania w 14 kwi 2021 Repozytorium / Deposited in Repository on Rodzaj Uznanie Autorstwa - Uycie Niekomercyjne - Bez utworów zalenych (CC-BY-NC-ND licencji / Type of licence 4.0) Kolanowska Marta, Rewicz Agnieszka, Nowak Sawomir: Significant habitat loss of the Cytuj t wersj / black vanilla orchid (Nigritella nigra s.l., Orchidaceae) and shifts in its pollinators Cite this availability as results of global warming, Global Ecology and Conservation, Elsevier BV, version vol. 27, 2021, pp. 1-20, DOI:10.1016/j.gecco.2021.e01560 Global Ecology and Conservation 27 (2021) e01560 Contents lists available at ScienceDirect Global Ecology and Conservation journal homepage: www.elsevier.com/locate/gecco Original Research Article Significant habitat loss of the black vanilla orchid (Nigritella nigra s.l., ]] Orchidaceae) and shifts in its pollinators availability as results of ]]]]]]]] global warming Marta Kolanowskaa,b, Agnieszka Rewiczc,⁎, Sławomir Nowakd a University of Lodz, Faculty of Biology and Environmental Protection, Department of Geobotany and Plant Ecology, Banacha 12/16, 90-237 Lodz, Poland b Department of Biodiversity Research, Global Change Research Institute AS CR, Bělidla 4a, 603 00 Brno, Czech Republic c University of Lodz, Faculty of Biology and Environmental Protection, Department of Biogeography, Paleoecology and Nature Conservation, 1/3 Banacha Str., 90-237 Lodz, Poland d University of Gdansk, Faculty of Biology, Department of Plant Taxonomy and Nature Conservation, Wita Stwosza 59, 80-308 Gdańsk, Poland article info abstract Article history: The black vanilla orchid (Nigritella nigra s.l.) is a perennial plant found in the main European Received 27 May 2020 mountain ranges. It occurs in large numbers in the Alps, but it has become a rare and Received in revised form 26 March 2021 endangered species in Scandinavia. Two subspecies of N. nigra s.l are recognized by most Accepted 26 March 2021 authors – the nominal subspecies which is restricted in its distribution to Scandinavia and Available online xxxx N. nigra subsp. austriaca which is found in the alpine region. Some taxonomists postulated that these two taxa should be considered as separated species. The N. nigra s.l. is pollinated Keywords: Nigritella nigra mostly by Lepidoptera. As a mainly montane species it is especially fragile to global warming, Niche modeling however, some previously published reports indicated that the climate changes will not Pollinators significantlyaffect northern populations of this species. The aim of this study was to evaluate Bioclimatic preferences the differences in the climatic niche preferences between Scandinavian and central European Global warming populations of the black vanilla orchid and to estimate the impact of global warming on the distribution of this species using (ENM). Additionally, the predicted future location and extent of suitable climatic niches of insects pollinating studied orchid was modeled in order to estimate the availability of pollinators for this montane plant. This approach was applied as the persistence of an orchid population depends on pollination and subsequent seed production. Our analyses showed that the northern and southern populations differ in bio climatic preferences and geographical distribution of these orchids together with variations in their chromosomes number and morphological discrepancies, suggest that N. nigra in not homogenous taxon as postulated by some authors and this approach should be also applied in assessing conservation priorities in Europe. Both, northern and southern population of N. nigra, will face significant habitat loss as a result of the global warming. In the best case scenario (rcp2.6) only 31.7% and 60.5% of the currently suitable niches will be still available for N. nigra respectively. The most damaging rcp8.5 scenario will cause the extreme decline of the coverage of orchid and just 2.3% of the habitats will be still suitable for N. nigra in the North and 18% for N. nigra in the South. Within the future potential range of N. nigra and N. nigra subsp. austriaca some pollinators will be still available for orchids, mostly for the latter taxon. Considering that the flowering time of the orchid seems to overlap with the ⁎ Corresponding author. E-mail addresses: [email protected] (M. Kolanowska), [email protected] (A. Rewicz), [email protected] (S. Nowak). https://doi.org/10.1016/j.gecco.2021.e01560 2351-9894/© 2021 The Author(s). Published by Elsevier B.V. CC_BY_NC_ND_4.0 Pobrano z https://repozytorium.bg.ug.edu.pl / Downloaded from Repository of University of Gdańsk 2021-09-23 M. Kolanowska, A. Rewicz and S. Nowak Global Ecology and Conservation 27 (2021) e01560 activity of pollinators for the last 70 years we not expect significant desynchronization of these events which could prevent pollen transfer. Noteworthy as the Scandinavian popula tions N. nigra is characterized by lower genetic diversity than in the alpine region of central Europe, species seems to be more endangered in the North (Moen and Øien, 2002) and the future loss of habitats predicted in our study together with limited availability of pollinators can led to loss of the unique gene pool of this orchid. In our opinion this fact should be considered in the establishment of nature protection projects and the conservation efforts should focus on areas which in the future will be still suitable for occurrence of this species and its pollen vectors. © 2021 The Author(s). Published by Elsevier B.V. CC_BY_NC_ND_4.0 1. Introduction Nigritella nigra (L.) Rchb. f. (syn. Gymnadenia nigra (L.) Rchb. f.), known also as the black vanilla orchid (Fig. 1) is a perennial representative of Orchidaceae found in the main European mountain ranges, extending from the Pyrenees to the Alps and the Balkans, and up to Central Scandinavia (Moen and Øien, 2002; Delforge, 2006). The disjunctive arctic-alpine range is relatively common in both plants and animals and it is a result of various biogeographical patterns of the vicariance and/or dispersal Fig. 1. Black vanilla orchid in its natural habitat. (A–B) Etang de Lers, Ariege, S France (photos: Mark Lunn), (C) Schwefelbergbad, Kanton Bern, Switzerland (photo: Christian Kobel), (D–E) Marieby near Östersund, Jämtland, Sweden (photos: Marco Klüber/ www.m-klueber.de). 2 Pobrano z https://repozytorium.bg.ug.edu.pl / Downloaded from Repository of University of Gdańsk 2021-09-23 M. Kolanowska, A. Rewicz and S. Nowak Global Ecology and Conservation 27 (2021) e01560 events (Schmitt et al., 2010). In such disconnected populations the opportunity for allopatric speciation increase (Hoelzer et al., 2008) and the detailed genetic analyses are useful in assessing the proper taxonomic status of taxa characterized by dis- continuous geographical ranges (Medrano and Herrera, 2008). Without a doubt, the effective conservation strategies should be focused on appropriate taxonomical units, but evolutionarily and genetically divergent lineages within threatened species are often not recognized (Llorens et al., 2015). Teppner and Klein (1990) suggested separation of two subspecies within N. nigra based on spur length and chromosomes number. In this taxonomic concept the nominal subspecies of N. nigra occurs only in two areas in Scandinavia while the alpine region of central Europe is occupied by N. nigra subsp. austriaca Teppner and Klein. The same authors (Teppner and Klein, 1993) further separated N. nigra representatives occurring in the Pyrenees as N. nigra subsp. iberica Teppner and Klein. The genetic studies (Hedrén et al., 2017) supported approach with heterogenous concept of N. nigra, but in spite of minor differences in morphology (Teppner, 2004) and allozymes (Hedrén et al., 2000), only delineation of subsp. nigra and subsp. austriaca seemed to be justified (Hedrén et al., 2017). Delforge et al. (1991) raised both taxa to the species rank. In our work, we proceeded from the concept of N. nigra s.l. because much of the pollination and occurrence data were and are often attributed to this taxon. In our opinion, without a detailed analysis of the material studied, which is often impossible, it would be imprudent to assign the data a priori to one taxon or the other. However, we also discuss the results obtained in the context of the aforementioned concepts of N. nigra. It is worth to notice that a decade ago it was proposed to lump Nigritella Rich. in Gymnadenia R. Br. (Bateman, 2009) despite clear morphological differences between these taxa (Moore, 1980; Baumann et al., 2006; Kellenberger et al., 2019) and results of molecular research (Ståhlberg, 1999; Hedrén et al., 2000). More recently the phylogenetic and genetic studies confirmed the separateness of these two genera (Hedrén et al., 2017; Brandrud et al., 2019). However, there is still not complete agreement on the classification of the two genera, as detailed by Bateman (2021), who clearly advocates accepting the genus Gymnadenia