Fecal microbiota and diet compositions of muskox female adults and calves

Gut microbiome is vertically transmitted by maternal lactation at birth in mammals. In this study, we investigated the gut microbiome and diet compositions of muskox, a large herbivore in the high Arctic. From muskox feces in Ella Island, East Greenland, we compared the microbiota composition using bacterial 16S rRNA gene sequencing and the dietary compositions of six female adults and four calves have been compared. Firmicutes was the most abundant bacterial phylum in both adults and calves, comprising 94.36% and 94.03%, respectively. There were significant differences in the relative abundance of two Firmicutes families: the adults were mainly dominated by Ruminococcaceae (73.90%), while the calves were dominated by both Ruminococcaceae (56.25%) and Lachnospiraceae (24.00%). Stable isotope analysis on the feces and eight referential plant samples in the study area showed that both adults and calves had similar ranges of 13C and 15N, possibly derived from the dominant diet plants of Empetrum nigrum and Salix glauca. Despite the similar diets, the different gut microbiome compositions in muskox adults and calves indicate that the gut microbiome of the calves may not be fully colonized yet as much as the one of the adults.

New insights into the 21 November 2000 tsunami in West Greenland from analyses of the tree−ring structure of Salix glauca

We test the application of dendrochronological methods for dating and assessing the environmental impacts of tsunamis in polar regions, using an example of the 21 Novem− ber 2000 landslide−generated tsunami in Vaigat Strait (Sullorsuaq Strait), West Greenland. The studied tsunami inundated a c. 130 m−wide coastal plain with seawater, caused erosion of beaches and top soil and covered the area with an up to 35 cm−thick layer of tsunami de− posits composed of sand and gravel. Samples of living shrub, Salix glauca (greyleaf wil− low) were collected in 2012 from tsunami−flooded and non−flooded sites. The tree−ring analyses reveal unambiguously that the tsunami−impacted area was immediately colonized during the following summer by rapidly growing shrubs, whilst one of our control site spec− imens records evidence for damage that dates to the time of the tsunami. This demonstrates the potential for dendrochronological methods to act as a precise tool for the dating of Arc− tic paleotsunamis, as well as rapid post−tsunami ecosystem recovery. The reference site shrubs were likely damaged by solifluction in the autumn 2000 AD that was triggered by high seasonal rainfall, which was itself a probable contributory factor to the tsunami−gener− ating landslide.

Dryas fell-fields in the East of the European part of the Russian Arctic

Communities with Dryas octopetala dominance are rather rare in the East European North. Some of these occupying zonal positions on watersheds within the typical tundra subzone are described in the tradition of the dominant approach at the Vangurey Upland in the northern part of Bolshezemelskaya tundra (Andreev, 1932), the highest moraine elevations in the northern parts of Malozemelskaya tundra (Dedov, 2006) and at the Kolguev Isl. (Bogdanovskaya-Gienef, 1938; Smirnova, 1938). Besides Dryas octopetala abundant species in these stands are willows Salix glauca, S. hastata, S. polaris, S. reticulata, sedge Carex arctisibirica and mesophyte forbs as well bryophytes Aulacomnium turgidum, Hylocomium splendens, Tomentypnum nitens and Ptilidium ciliare in ground layer. The diagnostic species of Loiseleurio-Vaccinietea Eggler ex Schubert 1960 Arctous alpina, Empetrum hermaphroditum and Vaccinium vitis-idaea are also common. Zonal communities of similar composition and structure, but dominating by Dryas punctata, were described on the Taymyr Peninsula as Carici arctisibiricae–Hylocomietum alaskani Matveyeva 1994 (Matveyeva, 1994) and on Wrangel Isl. as Carici lugentis–Hylocomietum alaskani (Sekretareva, 1998; Kholod, 2007) for which the new alliance Caricion lungentis all. prov., within the order Salicetalia polaris Hartmann 1980 has been suggested (Kholod, 2007). The revision of similar syntaxa in the East European North is in our plans.

New Records of Vascular Plants in the Yukon Territory VIII

Forty-seven taxa, 35 native and 12 introduced, are reported as new to the flora of Yukon and nine taxa previously reported are deleted. The new native taxa are: Artemisia arctica ssp. comata, Botrychium alaskense, Botrychium minganense, Bromus richardsonii, Calamagrostis holmii, Carex incurviformis, Carex mackenziei, Carex microchaeta ssp. nesophila, Carex ramenskii, Carex rariflora var. androgyna, Carex tahoensis, Carex xerantica, Carex × flavicans, Deschampsia sukatschewii, Eleocharis erythropoda, Eleocharis macrostachya, Eleocharis mamillata, Erigeron ochroleucus, Impatiens noli-tangere, Limnorchis huronensis, Nymphaea tetragona, Polygonum douglasii ssp. douglasii, Potamogeton natans, Potentilla crebridens ssp. hemicryophila, Puccinellia tenella ssp. langeana, Rumex beringensis, Salix farriae, Salix glauca ssp. Stipuli fera, Saussurea nuda, Saxifraga hyperborea, Saxifraga rivularis ssp. arctolitoralis, Silene soczavana var. macrosperma, Symphyotrichum subspicatum, Taraxacum hyparcticum, and Zannichellia palustris. The new introduced taxa are: Acer negundo, Avena fatua, Camelina microcarpa, Crepis capillaris, Hippophae rhamnoides, Lamium amplexicaule, Linaria dalmatica, Medicago lupulina, Prunus padus, Rumex pseudonatronatus, Valeriana officinale, and Viola tricolor. Deleted taxa are: Aster laevis var. geyeri, Carex athrostachya, Elatine triantha, Camelina sativa, Erysimum cheiri, Galium palustre, Impatiens capensis, Platanthera hyperborea, and Sonchus oleraceus. Vouchers are cited and general notes on distribution and identification are provided. Four of the native taxa reported here are new to Canada: Botrychium alaskense, Carex microchaeta ssp. nesophila, Potentilla crebridens ssp. hemicryophila and Rumex beringensis.