scholarly journals Background invertebrate herbivory on dwarf birch (Betula glandulosa-nana complex) increases with temperature and precipitation across the tundra biome

Polar Biology ◽  
2017 ◽  
Vol 40 (11) ◽  
pp. 2265-2278 ◽  
Author(s):  
Isabel C. Barrio ◽  
Elin Lindén ◽  
Mariska Te Beest ◽  
Johan Olofsson ◽  
Adrian Rocha ◽  
...  
Keyword(s):  
Temperature And Precipitation ◽  
Betula Glandulosa ◽  
Dwarf Birch ◽  
Invertebrate Herbivory

scholarly journals Publisher Correction to: Background invertebrate herbivory on dwarf birch (Betula glandulosa-nana complex) increases with temperature and precipitation across the tundra biome

Polar Biology ◽  
2018 ◽  
Vol 41 (8) ◽  
pp. 1653-1654
Author(s):  
Isabel C. Barrio ◽  
Elin Lindén ◽  
Mariska Te Beest ◽  
Johan Olofsson ◽  
Adrian Rocha ◽  
...  
Keyword(s):  
Temperature And Precipitation ◽  
Betula Glandulosa ◽  
Dwarf Birch ◽  
Invertebrate Herbivory

The population biology of the arctic dwarf birch, Betula glandulosa: seed rain and the germinable seed bank

1988 ◽  
Vol 66 (10) ◽  
pp. 2055-2061 ◽  
Author(s):  
I. Michael Weis ◽  
Luise A. Hermanutz
Keyword(s):  
Seed Bank ◽  
Weight Distribution ◽  
Population Biology ◽  
Early Spring ◽  
Seed Rain ◽  
The Arctic ◽  
Low Density ◽  
Soil Cores ◽  
Betula Glandulosa ◽  
Dwarf Birch

The seed rain and seed bank of arctic dwarf birch, Betula glandulosa, were studied at Kuujjuaq, Que., and Tarr Inlet, near Iqaluit, N.W.T. At each site dispersing seeds were captured in sticky traps in three adjacent plots having locally high and low birch densities; soil cores were collected in parallel. Trap data indicate that birch samaras disperse principally during late fall and early spring. The number of samaras dispersed was significantly greater at Kuujjuaq than near Iqaluit and was greater in high- than in low-density areas. Samaras collected at Kuujjuaq were significantly heavier (x = 0.19 mg) than those from Tarr Inlet (x = 0.10 mg). Germination showed an asymptotic exponential weight dependence. From the weight distribution of samaras, we expected germination of 69.7% of samaras from Kuujjuaq. Few viable propagules were found in collections from the Iqaluit area; from their weight distribution 0.38% were expected to germinate. We predicted emergence from soil cores, using seed-trap and germination data, and tested predictions under greenhouse conditions. Observations and predictions agreed for low-density areas. At Kuujjuaq 248 emergences/m2 were predicted and 229 observed; at Iqaluit no emergences were predicted and none observed. In high-density plots at Kuujjuaq 9292 emergences/m2 were predicted and 2164 observed. Corresponding rates for Iqaluit were 2 and 17 emergences/m2, respectively. Differences in seed banks and recruitment indicate differences in the structure, dynamics, and reproductive biology of populations at the two sites.

Triterpene constituents of the dwarf birch, Betula glandulosa

1992 ◽  
Vol 31 (7) ◽  
pp. 2321-2324 ◽  
Author(s):  
A.R.E. Sinclair ◽  
David E. Williams ◽  
Raymond J. Andersen
Keyword(s):  
Betula Glandulosa ◽  
Dwarf Birch

Pollen size of Betula in northern Alaska and the interpretation of late Quaternary vegetation records

1991 ◽  
Vol 69 (8) ◽  
pp. 1666-1672 ◽  
Author(s):  
Mary E. Edwards ◽  
Janice C. Dawe ◽  
W. Scott Armbruster
Keyword(s):  
Late Quaternary ◽  
Temporal Trends ◽  
Birch Pollen ◽  
Size Variation ◽  
Pollen Size ◽  
Betula Glandulosa ◽  
Dwarf Birch ◽  
Fossil Records ◽  
Northern Alaska ◽  
Significant Size

It is commonly asserted in paleoecological studies that shrub birch tends to have smaller pollen than tree birch, but this is poorly documented for Alaskan taxa. We measured freshly dehisced pollen from 55 plants in four northern Alaskan taxa, Betula resinifera (tree birch), Betula glandulosa (shrub birch), Betula nana ssp. exilis (dwarf birch), and Betula resinifera × glandulosa (hybrid). No significant differences existed between mean pollen sizes of any taxa. Betula glandulosa showed significant size variation among sites. Increase in birch-pollen size with time observed in some late Quaternary fossil records from northern Alaska cannot be safely attributed to a change from shrub to tree-dominated vegetation. Alternative explanations for temporal trends in pollen size are (i) evolution of populations, (ii) an environmental effect on pollen size, and (iii) local extinction of a previously widespread taxon. Key words: Alaska, Beringia, Betula, late Quaternary, pollen size.

CLONAL STRUCTURE OF ARCTIC DWARF BIRCH (BETULA GLANDULOSA) AT ITS NORTHERN LIMIT

1989 ◽  
Vol 76 (5) ◽  
pp. 755-761 ◽  
Author(s):  
L. A. Hermanutz ◽  
D. J. Innes ◽  
I. M. Weis
Keyword(s):  
Clonal Structure ◽  
Northern Limit ◽  
Betula Glandulosa ◽  
Dwarf Birch

Analyse macrofossile d'une palse subarctique (Québec nordique)

1995 ◽  
Vol 73 (4) ◽  
pp. 527-537 ◽  
Author(s):  
Claude Lavoie ◽  
Serge Payette
Keyword(s):  
Picea Mariana ◽  
Structural Changes ◽  
Black Spruce ◽  
Vascular Plant ◽  
Time Of Arrival ◽  
Peat Deposits ◽  
Betula Glandulosa ◽  
Dwarf Birch ◽  
Forest Limit ◽  
Hippuris Vulgaris

Plant and animal macrofossils (vascular plant, moss, fungus, bryozoan, cladoceran and coleoptera remains) were analyzed to reconstitute the development of a palsa peat located at the northwestern forest limit of subarctic Quebec (57°45′N., 76°15′W.) and to detect any black spruce (Picea mariana) remains older than the presumed time of arrival of the species in the study area (4560 BP), after the deglaciation. The oldest peat deposits were formed in a fen with many shallow pools between 5850 and 4500 BP. The flora was mainly composed of aquatic taxa (Ranunculus trichophyllus, Potamogeton spp., Hippuris vulgaris). Around 4500 BP, there was a shift from a very wet fen to a sedge fen with Potentilla palustris and Menyanthes trifoliata. From 3700 to 1950 BP, most plant remains were wood fragments of dwarf birch (Betula glandulosa). The formation of the palsa occurred after 1950 BP. The development of this peatland is similar to that of other palsa peatlands of subarctic Quebec, except that it is characterized by the presence of a thick peat layer composed of Betula glandulosa fragments at the top of the palsa. There were no black spruce remains older than 4560 BP. Three peaks of coleoptera abundance were identified at 4400, 3800, and 2700 BP, respectively. Most of the coleoptera taxa being hygrophilous, it was not possible to infer structural changes in the peatland from their fragments. Key words: palsa peatland, macrofossil analysis, subarctic Quebec, Betula glandulosa, Picea mariana, beetles.

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