Recent climate warming favours more specialized cladoceran taxa in western Canadian Arctic lakes

2015 ◽  
Vol 42 (8) ◽  
pp. 1553-1565 ◽  
Author(s):  
Joshua R. Thienpont ◽  
Jennifer B. Korosi ◽  
Elisa S. Cheng ◽  
Kayla Deasley ◽  
Michael F. J. Pisaric ◽  
...  
Keyword(s):  
Climate Warming ◽  
Canadian Arctic ◽  
Arctic Lakes ◽  
Recent Climate

Regional gold mining activities and recent climate warming alter diatom assemblages in deep sub-Arctic lakes

Polar Biology ◽  
2020 ◽  
Vol 43 (4) ◽  
pp. 305-317
Author(s):  
Branaavan Sivarajah ◽  
Cynthia L. Cheney ◽  
Madi Perrett ◽  
Linda E. Kimpe ◽  
Jules M. Blais ◽  
...  
Keyword(s):  
Climate Warming ◽  
Gold Mining ◽  
Arctic Lakes ◽  
Mining Activities ◽  
Diatom Assemblages ◽  
Recent Climate

Recent climate warming and the Varas rock glacier activity, Cordillera Oriental, Central Andes of Argentina

GeoResJ ◽  
2017 ◽  
Vol 14 ◽  
pp. 67-79 ◽  
Author(s):  
Mateo A Martini ◽  
Jorge A Strelin ◽  
Eliseo Flores ◽  
Ricardo A Astini ◽  
Michael R Kaplan
Keyword(s):  
Climate Warming ◽  
Central Andes ◽  
Rock Glacier ◽  
Recent Climate

scholarly journals Do Himalayan treelines respond to recent climate change? An evaluation of sensitivity indicators

2015 ◽  
Vol 6 (1) ◽  
pp. 245-265 ◽  
Author(s):  
U. Schickhoff ◽  
M. Bobrowski ◽  
J. Böhner ◽  
B. Bürzle ◽  
R. P. Chaudhary ◽  
...  
Keyword(s):  
Climate Change ◽  
Climate Warming ◽  
Tree Growth ◽  
Empirical Studies ◽  
Growth Patterns ◽  
Niche Modelling ◽  
Ongoing Research ◽  
Recent Climate Change ◽  
Recent Climate ◽  
Response Gradient

Abstract. Climate warming is expected to induce treelines to advance to higher elevations. Empirical studies in diverse mountain ranges, however, give evidence of both advancing alpine treelines and rather insignificant responses. The inconsistency of findings suggests distinct differences in the sensitivity of global treelines to recent climate change. It is still unclear where Himalayan treeline ecotones are located along the response gradient from rapid dynamics to apparently complete inertia. This paper reviews the current state of knowledge regarding sensitivity and response of Himalayan treelines to climate warming, based on extensive field observations, published results in the widely scattered literature, and novel data from ongoing research of the present authors. Several sensitivity indicators such as treeline type, treeline form, seed-based regeneration, and growth patterns are evaluated. Since most Himalayan treelines are anthropogenically depressed, observed advances are largely the result of land use change. Near-natural treelines are usually krummholz treelines, which are relatively unresponsive to climate change. Nevertheless, intense recruitment of treeline trees suggests a great potential for future treeline advance. Competitive abilities of seedlings within krummholz thickets and dwarf scrub heaths will be a major source of variation in treeline dynamics. Tree growth–climate relationships show mature treeline trees to be responsive to temperature change, in particular in winter and pre-monsoon seasons. High pre-monsoon temperature trends will most likely drive tree growth performance in the western and central Himalaya. Ecological niche modelling suggests that bioclimatic conditions for a range expansion of treeline trees will be created during coming decades.

Recent climate warming forces contrasting growth responses of white spruce at treeline in Alaska through temperature thresholds

2004 ◽  
Vol 10 (10) ◽  
pp. 1724-1736 ◽  
Author(s):  
Martin Wilmking ◽  
Glenn P. Juday ◽  
Valerie A. Barber ◽  
Harold S. J. Zald
Keyword(s):  
Climate Warming ◽  
White Spruce ◽  
Growth Responses ◽  
Temperature Thresholds ◽  
Recent Climate

Changes in temperature sensitivity of spring phenology with recent climate warming in Switzerland are related to shifts of the preseason

2017 ◽  
Vol 23 (12) ◽  
pp. 5189-5202 ◽  
Author(s):  
Sabine Güsewell ◽  
Reinhard Furrer ◽  
Regula Gehrig ◽  
Barbara Pietragalla
Keyword(s):  
Climate Warming ◽  
Temperature Sensitivity ◽  
Spring Phenology ◽  
Recent Climate

The effects of isolation and colonization history on the genetic structure of marine-relict populations of Atlantic cod (Gadus morhua) in the Canadian Arctic

2006 ◽  
Vol 63 (8) ◽  
pp. 1830-1839 ◽  
Author(s):  
David C Hardie ◽  
Roxanne M Gillett ◽  
Jeffrey A Hutchings
Keyword(s):  
Gadus Morhua ◽  
Atlantic Cod ◽  
Allelic Diversity ◽  
Canadian Arctic ◽  
Environmental Stochasticity ◽  
Arctic Lakes ◽  
The Arctic ◽  
Effective Population ◽  
Eastern Canada ◽  
High Allelic Diversity

The genetic consequences of extended periods at low population size are fundamental to the conservation of depleted species such as the Atlantic cod (Gadus morhua). We compared microsatellite genetic variability among cod populations in Canadian Arctic lakes with that of Gilbert Bay resident and inshore cod from eastern Canada. The Arctic populations had the lowest genetic diversity and were the most strongly genetically structured and distinct. By contrast, eastern Canadian samples expressed high allelic diversity and were not significantly genetically structured or distinct relative to each other, whereas Gilbert Bay resident cod were intermediate to the Arctic and eastern Canadian groups. Our results are consistent with the hypothesis that the Arctic populations were colonized between 8000 and 5000 years ago and have experienced little or no gene flow since that time. Despite isolation at the extreme of the species' range, the Arctic populations have retained relatively high heterozygosities and high genetic effective population sizes relative to census sizes (Ne–Nc ratios). Potential explanations for this include the absence of fishing pressure, allowing for the persistence of large, highly fecund individuals, as well as biotic (e.g., absence of planktivores) and abiotic (e.g., low environmental stochasticity) factors in the Arctic lakes that minimize individual variance in reproductive success.

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