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Polar Biology
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Papers 4537
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#1Anders Torstensson (University of Gothenburg)H-Index: 7
#2Carlos Jiménez (UMA: University of Málaga)H-Index: 23
Last.Angela Wulff (University of Gothenburg)H-Index: 26
view all 4 authors...
Areas in western Antarctica are experiencing rapid climate change, where ocean warming results in more sea ice melt simultaneously as oceanic CO2 levels are increasing. In this study, we have tested how increased temperature (from −1.8 to 3 °C) and decreased salinity (from 35 to 20 and 10) synergistically affect the growth, photophysiology and biochemical composition of the Antarctic sea-ice diatom Nitzschia lecointei. In a separate experiment, we also addressed how ocean acidification (from 400...
#1Susan E. Anthony (UWO: University of Western Ontario)H-Index: 2
#2Christopher M. Buddle (McGill University)H-Index: 25
Last.Brent J. Sinclair (UWO: University of Western Ontario)H-Index: 44
view all 4 authors...
Arctic and sub-Arctic terrestrial ectotherms contend with large daily and seasonal temperature ranges. However, there are few data available on the thermal biology of these high-latitude species, especially arachnids. We determined the lower and upper thermal limits of seven species of wolf spider from the genus Pardosa (Araneae: Lycosidae) collected in summer from the Yukon Territory (Canada) and Southern Greenland. None of these species survived freezing, and while spiderlings appeared freeze-...
#1Manuel Novillo (CONICET: National Scientific and Technical Research Council)H-Index: 1
#2Eugenia Moreira (CONICET: National Scientific and Technical Research Council)H-Index: 2
Last.Esteban Barrera-Oro (CONICET: National Scientific and Technical Research Council)H-Index: 6
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The knowledge of the reproductive biology of blackfin icefish Chaenocephalus aceratus in the southern Scotia Arc has been based, primarily on macroscopic observations of its maturation cycle, and lately, on histological analysis of ovaries in developing phase exclusively. Our study on reproduction of C. aceratus collected at Potter Cove (PC), South Shetland Islands (SSI), highlights the importance of histologic techniques to validate gonadal macroscopic maturity stages to estimate reliable repro...
#1Jessica A. EricsonH-Index: 2
#2Nicole Hellessey (UTAS: University of Tasmania)H-Index: 2
Last.Patti Virtue (UTAS: University of Tasmania)H-Index: 22
view all 7 authors...
Fatty acid analysis for estimating dietary sources in marine predators is a powerful tool in food web research. However, questions have been raised about using fatty acids as dietary indicators from whole lipid samples, rather than from separate lipid classes. A drawback of scientific field-based studies is that samples are rarely collected over extended periods, precluding seasonal dietary comparisons. We used fisheries samples obtained over one year to investigate seasonal variations in the fa...
#1Ramona Kern (University of Rostock)H-Index: 8
#2Vivien Hotter (University of Rostock)H-Index: 1
Last.Ulf Karsten (University of Rostock)H-Index: 54
view all 16 authors...
Although cryptogamic covers are important ecosystem engineers in high Arctic tundra, they were often neglected in vegetation surveys. Hence we conducted a systematic survey of cryptogamic cover and vascular plant coverage and composition at two representative, but differing Arctic sites (Ny-Alesund, Svalbard) along catenas with a natural soil moisture gradient, and integrated these data with physical–chemical soil properties. Soil samples were taken for comprehensive pedological and mineralogica...
#1Rebecca McGuire (UAF: University of Alaska Fairbanks)
#2Robert SuydamH-Index: 19
Last.Abby N. Powell (UAF: University of Alaska Fairbanks)H-Index: 19
view all 4 authors...
Most king (Somateria spectabilis) and common eiders (S. mollissima v-nigra) breeding in the northwestern Nearctic migrate past Point Barrow, Alaska. Spring migration counts have been conducted there since 1953; during 1976–1996, both species declined > 50% for unknown reasons. To evaluate population trends, counts in 2003, 2004, 2015, and 2016 were compared to earlier counts. King eider estimates were 304,966 (95% CI ± 76,254) in 2003, 591,961 (± 172,011) in 2004, 796,419 (± 304,011) in 2015, an...
#1Patricia Sommers (CU: University of Colorado Boulder)
#2Dorota L. Porazinska (CU: University of Colorado Boulder)H-Index: 20
Last.Steven K. Schmidt (CU: University of Colorado Boulder)H-Index: 55
view all 6 authors...
Cryoconite holes are surface melt-holes in ice containing sediments and typically organisms. In Antarctica, they form an attractive system of isolated mesocosms in which to study microbial community dynamics in aquatic ecosystems. Although microbial assemblages within the cryoconite holes most closely resemble those from local streams, they develop their own distinctive composition. Here, we characterize the microbial taxa over time in cryoconite holes experimentally created from supraglacial se...
#1Valentina Savaglia (University of Liège)H-Index: 1
#2Carolina Veronica Matula (Instituto Antártico Argentino)
Last.Katharina ZacherH-Index: 13
view all 5 authors...
The Western Antarctic Peninsula (WAP) is a hot spot of global warming, including decreased sea-ice cover during winter and increased sedimentation during summer due to glacial melt. Subsequently, an altered irradiance and temperature regime in the water column may affect the performance of primary producers and change competitive structures. The brown, subtidal macroalgae Desmarestia menziesii and D. anceps are ecosystem engineers and of extreme importance for the Antarctic coastal ecosystem. In...
#1Anton Chichvarkhin (RAS: Russian Academy of Sciences)H-Index: 6
The sea star Henricia oculata (Pennant, 1777) is a common species known from the northern Atlantic for more than two centuries. This species has never been reported from Russian coastline along the Arctic and northwestern Pacific. Here, we report its population from Bering Sea off Mednyi Island of Commander Islands archipelago. DNA barcode of H. oculata from Commander Islands, which is a fragment of mitochondrial 16S rRNA gene, is similar to the barcodes of the specimens from the northeastern Pa...
#1Chaofeng Wang (CAS: Chinese Academy of Sciences)H-Index: 1
#2Zhiqiang Xu (CAS: Chinese Academy of Sciences)H-Index: 1
Last.Tian Xiao (CAS: Chinese Academy of Sciences)H-Index: 16
view all 9 authors...
Knowledge on the distribution of plankton species is fundamental to understand planktonic ecosystem structure and function. To understand the difference of tintinnid vertical distribution pattern in the Bering Sea and the Arctic Ocean and their connection through the Bering Strait, we reported the vertical distribution of tintinnid assemblages from the Bering Sea to the Arctic Ocean. Bering Sea-dominant species (Codonellopsis frigida, Ptychocylis obtusa, Parafavella spp., Acanthostomella norvegi...
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