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Pollen Morphology of Selected Tundra Plants from the High Arctic of Ny-Ålesund, Svalbard 1 2 3 4 1* YAO Yifeng , ZHAO Qi , BERA Subir , LI Xiaoli & LI Chengsen

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Pollen Morphology of Selected Tundra Plants from the High Arctic of Ny-Ålesund, Svalbard 1 2 3 4 1* YAO Yifeng , ZHAO Qi , BERA Subir , LI Xiaoli & LI Chengsen · Article · Advances in Polar Science doi: 10.3724/SP.J.1085.2012.00103 June 2012 Vol. 23 No. 2: 103-115 Pollen morphology of selected tundra plants from the high Arctic of Ny-Ålesund, Svalbard 1 2 3 4 1* YAO Yifeng , ZHAO Qi , BERA Subir , LI Xiaoli & LI Chengsen 1 State Key Laboratory of Systematic and Evolutionary Botany, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China; 2 College of Life Science, Capital Normal University, Beijing 100037, China; 3 Department of Botany, University of Calcutta, Kolkata 700019, India; 4 Beijing Museum of Natural History, Beijing 100050, China Received 12 April 2012; accepted 10 May 2012 Abstract Documenting morphological features of modern pollen is fundamental for the identification of fossil pollen, which will assist researchers to reconstruct the vegetation and climate of a particular geologic period. This paper presents the pollen morphol- ogy of 20 species of tundra plants from the high Arctic of Ny-Ålesund, Svalbard, using light and scanning electron microscopy. The plants used in this study belong to 12 families: Brassicaceae, Caryophyllaceae, Cyperaceae, Ericaceae, Juncaceae, Papav- eraceae, Poaceae, Polygonaceae, Ranunculaceae, Rosaceae, Salicaceae, and Scrophulariaceae. Pollen grain shapes included: spher- oidal, subprolate, and prolate. Variable apertural patterns ranged from 2-syncolpate, 3-colpate, 3-(-4)-colpate, 3-(-5)-colpate, 3-colporate, 5-poroid, ulcerate, ulcus to pantoporate. Exine ornamentations comprised psilate, striate-perforate, reticulate, mi- croechinate, microechinate-perforate, scabrate, granulate, and granulate-perforate. This study provided a useful reference for com- parative studies of fossil pollen and for the reconstruction of paleovegetation and paleoclimate in Svalbard region of Arctic. Keywords Arctic, Ny-Ålesund, pollen morphology, Svalbard, tundra plants Citation: Yao Y F, Zhao Q, Bera S, et al. Pollen morphology of selected tundra plants from the high Arctic of Ny-Ålesund, Svalbard. Adv Polar Sci, 2012, 23: 103-115, doi:10.3724/SP.J.1085.2012.00103 edly influence the Arctic ecosystems and biota, including 0 Introduction* plants and tundra vegetation[13-14]. Previously, a few collec- tion of modern pollen of tundra plants from Svalbard was Palynology is one of the most useful methods to investigate conducted by Rozema et al. for comparing with the fossil the relationship between modern pollen deposition and lo- [1] pollen from peat core sediments to reconstruct the past cal vegetation across a range of ecosystems . In addition, vegetation, climate and environment of that area[15]. To palynology allows researchers to reconstruct the past his- study the relationship between modern pollen deposition tory of vegetation, climate and environment in the Quater- [2-8] and local vegetation, and to reconstruct the past vegetation nary . This reconstruction of historical vegetation and and its response to climate change on Svalbard, we col- climate requires surveys of modern pollen morphology as a [9-10] lected surface soil samples and core sediments from prerequisite for identifying different fossil pollen types . Ny-Ålesund, Svalbard, during the Scientific Expeditions of Arctic regions are sensitive to global climate change. Chinese Arctic Yellow River Station in 2008 and 2011. To More and more evidences (e.g., rapid melting of glacial ice, prepare an index for ongoing research, we collected the permafrost thawing) suggest that the Arctic regions are un- [11-12] polliniferous parts of living tundra plants for pollen analysis. dergoing fast global warming , which will pronounc- This provided us with a baseline reference for pollen grains recovered from the surface and sub-surface core sediments. This paper presents the pollen morphology of selected tun- * Corresponding author (email: [email protected]) journal.polar.gov.cn 104 YAO Yifeng, et al. Adv Polar Sci June(2012) Vol. 23 No. 2 dra plants using light and scanning electron microscopy covers approximately 62 000 km2 (Figure 1). The region techniques, for further help in studying the relationship has a mild Arctic-oceanic climate, influenced by the North between modern pollen deposition and local vegetation in Atlantic Current (a branch of the West Spitzbergen Current), the Artic environment. which transports temperate water along the west coast of Svalbard. Due to the harsh environment on Svalbard (e.g., 1 Materials and methods low temperature, short growing season (6—10 weeks), lim- ited moisture and nutrient availability), the vegetation con- 1.1 Study site sists mainly of low and depressed plant types (seldom higher than 10 cm in height), including 164 vascular plant The fieldwork was conducted in the high Artic of Ny-Åle- species[16]. sund, Svalbard (74°—81°N and 10°—35°E), which covers Figure 1 Map showing the sampling sites in Ny-Ålesund, Svalbard. Ny-Ålesund (78º55'N, 11º56'E) is situated on Brøg- mounted in glycerine jelly. The slides were observed using gerhalvøya, western coast of Svalbard. The annual mean air a Leica DM 2500 light microscope with a 100× oil immer- temperature and rainfall between 2001 and 2008 were sion lens. Measurements of pollen grains were based on 20 -4.2℃ and 433 mm, respectively. Snow melt usually oc- individual pollen grains for each species. For SEM studies, curs in early July and snow starts to accumulate in late Au- pollen grains were treated by a graded ethanol series and gust[17]. The major vegetation components at Ny-Ålesund were dispersed on SEM stubs and sputter-coated with gold comprise polar willow (Salix polaris), mountain avens using a Hitachi E-1010 sputter coater. The samples were (Dryas octopetala), purple saxifrage (Saxifraga oppositifo- examined and photographed under a Hitachi S-4800 mi- lia), drooping saxifrage (S. cernua), tufted saxifrage (S. croscope at an accelerating voltage of 10 kV. cespitosa), bog saxifrage (S. hirculus), wood rush (Luzula Both the polar axis diameter (P) and equatorial diame- confusa), knotweed (Polygonum viviparum), Arctic mouse- ter (E) of the pollen grains were measured under LM. P/E ear chickweed (Cerastium arcticum), and Arctic bell- values were calculated for each measured grain. Pollen ter- heather (Cassiope tetragona). minologies follow Punt et al.[19] and Hesse et al.[20] . Pollen size classes are defined as: very small (<10 µm), small (10 1.2 Materials and methodology —25 µm), medium (26—50 µm), large (51—100 µm), and very large (>100 µm)[20]. In this study, shape classes in Twenty species of tundra plants with flowers (Table 1) equatorial view (P/E), i.e., suboblate (0.75—0.88), spher- were collected from Ny-Ålesund during the Scientific Ex- oidal (0.88—1.14), subprolate (1.14—1.33), and prolate peditions of Chinese Arctic Yellow River Station (eight and (1.33—2.00) are used as proposed by Punt et al.[19]. twelve species were collected in 2008 and 2011, respec- tively). Pollen grains were extracted from flower anthers 2 Results and examined under Light Microscope (LM) and Scanning Electron Microscope (SEM). For LM studies, pollen grains The pollen grains were iso- or heteropolar, mainly spher- were acetolyzed following Erdtman’s method[18] and oidal, subprolate and prolate, with radial or bilateral sym- Pollen morphology of high arctic plants 105 metry. Sizes varied from small to medium, and apertures microechinate-perforate, scabrate, granulate, and granu- included 2-syncolpate, 3-colpate, 3-(-4)-colpate, 3-(-5)- late-perforate types of ornamentation were noted on the colpate, 3-colporate, 5-poroid, ulcerate, ulcus, and pan- pollen exines. The detailed pollen characteristics of each toporate. Psilate, striate-perforate, reticulate, microechinate, species are shown (Table 2) and described as follows. Table 1 Tundra plant species collected from Ny-Ålesund, Svalbard No. Family name Genus name Species name Locality 1 Caryophyllaceae Silene Silene wahlbergella Chowd. 2 2 Silene acaulis (L.) Jacq. 1 3 Cerastium Cerastium arcticum Lge. 1 4 Brassicaceae Draba Draba bellii Holm 1 5 Draba lactea Adams. 1 6 Braya Braya purpurascens (R. Br.) Bunge 3 7 Cochlearia Cochlearia officinalis L. 1 8 Polygonaceae Oxyria Oxyria digyna (L.) Hill 1 9 Polygonum Polygonum viviparum L. 5 10 Scrophulariaceae Pedicularis Pedicularis hirsuta L. 2 11 Pedicularis dasyantha (Trautv.) Hadač 5 12 Ranunculaceae Ranunculus Ranunculus pygmaeus Wahlenb. 2 13 Ranunculus nivalis L. 4 14 Papaveraceae Papaver Papaver dahlianum Nordh. 2 15 Poaceae Deschampsia Deschampsia alpina (L.) Roem. & Sch. 1 16 Ericaceae Cassiope Cassiope tetragona (L.) D.Don 1 17 Rosaceae Dryas Dryas octopetala L. 1 18 Salicaceae Salix Salix polaris Wahlenb. 1 19 Cyperaceae Carex Carex misandra R.Br. 5 20 Juncaceae Luzula Luzula confusa (Hartm.) Lindeb. 5 Locality: 1, 78°55′01.1″N, 11°56′56″E; 2, 78°56′05.3″N, 11°49′10.3″E; 3, 78°55′49.9″N, 11°50′34.9″E; 4, 78°57′24.1″N, 11°41′16.1″E; 5, 78°54′07.4″N, 12°09′01.8″E. Table 2 Pollen morphology of tundra plant species from Ny-Ålesund, Svalbard Pollen Polar axis Equatorial Exine thick- Species Aperture P/E Exine ornamentation Figure shape /µm axis /µm ness/µm Cerastium (29.8-) 40.5 (31.6-) 38.2 spheroidal pantoporate 1.06 microechinate-perforate 3.7 2a–2c arcticum (-47.2) (-46.2) (21.6-) 26.8 (20.2-) 25.9 Silene acaulis spheroidal pantoporate 1.04 microechinate-perforate 2.5 2d–2f (-31.2) (-30.6) Silene (25.6-) 28.9 (24.6-) 27.4 spheroidal pantoporate 1.05 microechinate-perforate 1.8 2g–2i wahlbergella (-36.0) (-33.0) (To be continued on the next page) 106 YAO Yifeng, et al. Adv Polar Sci June(2012) Vol. 23 No.
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