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https://www.readbyqxmd.com/read/29138934/habitat-quality-affects-stress-responses-and-survival-in-a-bird-wintering-under-extremely-low-ambient-temperatures
#1
Dina Cīrule, Tatjana Krama, Ronalds Krams, Didzis Elferts, Ants Kaasik, Markus J Rantala, Pranas Mierauskas, Severi Luoto, Indrikis A Krams
Animals normally respond to stressful environmental stimuli by releasing glucocorticoid hormones. We investigated whether baseline corticosterone (CORT), handling-induced corticosterone concentration(s), and body condition indices of members of willow tit (Poecile montanus) groups differed while wintering in old growth forests and managed young forests in mild weather conditions and during cold spells. Willow tits spend the winter season in non-kin groups in which dominant individuals typically claim their priority to access resources, while subordinate individuals may experience greater levels of stress and higher mortality, especially during cold spells...
November 14, 2017: Die Naturwissenschaften
https://www.readbyqxmd.com/read/29127226/risk-of-sudden-cardiac-death-in-relation-to-season-specific-cold-spells-a-case-crossover-study-in-finland
#2
Niilo R I Ryti, Elina M S Mäkikyrö, Harri Antikainen, Eeva Hookana, M Juhani Junttila, Tiina M Ikäheimo, Marja-Leena Kortelainen, Heikki V Huikuri, Jouni J K Jaakkola
OBJECTIVE: To test a priori hypothesis of an association between season-specific cold spells and sudden cardiac death (SCD). METHODS: We conducted a case-crossover study of 3614 autopsy-verified cases of SCD in the Province of Oulu, Finland (1998-2011). Cold spell was statistically defined by applying an individual frequency distribution of daily temperatures at the home address during the hazard period (7 days preceding death) and 50 reference periods (same calendar days of other years) for each case using the home coordinates...
November 10, 2017: BMJ Open
https://www.readbyqxmd.com/read/28923709/the-impact-of-heat-waves-and-cold-spells-on-respiratory-emergency-department-visits-in-beijing-china
#3
Xuping Song, Shigong Wang, Tanshi Li, Jinhui Tian, Guowu Ding, Jiaxin Wang, Jiexin Wang, Kezheng Shang
The objectives of this article were (i) to find the association between extreme temperatures and respiratory emergency department (ED) visits and (ii) to explore the added effects of heat waves and cold spells on respiratory ED visits in Beijing from 2009 to 2012. A quasi-Poisson generalised linear model combined with a distributed lag non-linear model was performed to quantify this association. The results indicated that (i) ambient temperature related to respiratory ED visits exhibited a U-shaped association...
February 15, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/28737248/frost-hardening-and-dehardening-potential-in-temperate-trees-from-winter-to-budburst
#4
Amarante Vitra, Armando Lenz, Yann Vitasse
We investigated how deciduous trees can adjust their freezing resistance in response to temperature during the progress of the ecodormancy phase, from midwinter to budburst. We regularly sampled twigs of four different temperate deciduous tree species from January to the leaf-out date. Using computer-controlled freezers and climate chambers, the freezing resistance of buds was measured directly after sampling and also after the application of artificial hardening and dehardening treatments, simulating cold and warm spells...
July 24, 2017: New Phytologist
https://www.readbyqxmd.com/read/28716407/overexpression-of-lsi1-in-cold-sensitive-rice-mediates-transcriptional-regulatory-networks-and-enhances-resistance-to-chilling-stress
#5
Changxun Fang, Pengli Zhang, Xin Jian, Weisi Chen, Hongmei Lin, Yingzhe Li, Wenxiong Lin
Frequent cold spells in late spring can damage early rice seedlings. However, overexpression of the silicon-uptake gene Lsi1 (Lsi1-OX) in cold-sensitive rice (Oryza sativa L., accession: Dular) notably enhances its chilling resistance. In this study, we found that continual chilling led to chlorophyll and RNA degradation in wild-type Dular leaves, whereas leaves from a Lsi1-OX line exhibited no obvious changes. A comparison of the global mRNA expression between the two rice lines showed that genes encoding photosynthesis-antenna proteins were downregulated and those encoding the proteasome were upregulated in the wild-type organism...
September 2017: Plant Science: An International Journal of Experimental Plant Biology
https://www.readbyqxmd.com/read/28630446/strong-sub-seasonal-wintertime-cooling-over-east-asia-and-northern-europe-associated-with-super-el-ni%C3%A3-o-events
#6
Xin Geng, Wenjun Zhang, Malte F Stuecker, Fei-Fei Jin
East Asia experienced a record-breaking cold event during the 2015/16 boreal winter, with pronounced impacts on livelihood in the region. We find that this large-scale cold spell can be attributed to the concurrent super El Niño event in the tropical Pacific. Our analysis reveals that all super El Niño winters (1982/83, 1997/98, and 2015/16) were accompanied by a rapid sub-seasonal North Atlantic Oscillation (NAO)/Arctic Oscillation (AO) phase reversal from a positive to a negative state during early January, which was largely caused by the interaction of these super El Niño events with the subtropical jet annual cycle...
June 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28593715/can-animal-habitat-use-patterns-influence-their-vulnerability-to-extreme-climate-events-an-estuarine-sportfish-case-study
#7
Ross E Boucek, Michael R Heithaus, Rolando Santos, Philip Stevens, Jennifer S Rehage
Global climate forecasts predict changes in the frequency and intensity of extreme climate events (ECEs). The capacity for specific habitat patches within a landscape to modulate stressors from extreme climate events, and animal distribution throughout habitat matrices during events, could influence the degree of population level effects following the passage of ECEs. Here, we ask (i) does the intensity of stressors of an ECE vary across a landscape? And (ii) Do habitat use patterns of a mobile species influence their vulnerability to ECEs? Specifically, we measured how extreme cold spells might interact with temporal variability in habitat use to affect populations of a tropical, estuarine-dependent large-bodied fish Common Snook, within Everglades National Park estuaries (FL US)...
October 2017: Global Change Biology
https://www.readbyqxmd.com/read/28468072/-impact-of-daily-mean-temperature-cold-spells-and-heat-waves-on-stroke-mortality-a-multivariable-meta-analysis-from-12-counties-of-hubei-province-china
#8
Y Q Zhang, C H Yu, J Z Bao
Objective: To assess the acute effects of daily mean temperature, cold spells, and heat waves on stroke mortality in 12 counties across Hubei province, China. Methods: Data related to daily mortality from stroke and meteorology in 12 counties across Hubei province during 2009-2012, were gathered. Distributed lag nonlinear model (DLNM) was first used, to estimate the county-specific associations between daily mean temperature, cold spells, heat waves and stroke mortality. Multivariate Meta-analysis was then applied to pool the community-specific relationships between temperature and stroke mortality (exposure-response relationship) as well as both cold- and- heat-associated risks on mortality at different lag days (lag-response relationship)...
April 10, 2017: Zhonghua Liu Xing Bing Xue za Zhi, Zhonghua Liuxingbingxue Zazhi
https://www.readbyqxmd.com/read/28465307/the-impact-of-temperature-extremes-on-mortality-a-time-series-study-in-jinan-china
#9
Jing Han, Shouqin Liu, Jun Zhang, Lin Zhou, Qiaoling Fang, Ji Zhang, Ying Zhang
OBJECTIVE: To investigate the relationship between temperature extremes and daily number of deaths in Jinan, a temperate city in northern China. METHODS: Data ondaily number of deaths and meteorological variables over the period of 2011-2014 were collected. Cold spells or heat waves were defined as ≥3 consecutive days with mean temperature ≤5th percentile or ≥95th percentile, respectively. We applied a time-series adjusted Poisson regression to assess the effects of extreme temperature on deaths...
May 2, 2017: BMJ Open
https://www.readbyqxmd.com/read/28384570/effect-modification-of-individual-and-regional-scale-characteristics-on-heat-wave-related-mortality-rates-between-2009-and-2012-in-seoul-south-korea
#10
REVIEW
E-Jin Kim, Ho Kim
Many studies have investigated the associations between heat waves, ambient temperature, cold spells, and mortality or morbidity. Some studies have utilized effect modification to reveal the factors that increase an individual's susceptibility to temperature extremes, which can then be used to reshape public policy. In this study, we used a time-stratified case-crossover technique to examine how individual- and regional-scale characteristics modified heat wave-related impacts on mortality rates in Seoul, South Korea, between 2009 and 2012...
October 1, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28376915/cold-spell-en-route-delays-spring-arrival-and-decreases-apparent-survival-in-a-long-distance-migratory-songbird
#11
Martins Briedis, Steffen Hahn, Peter Adamík
BACKGROUND: Adjusting the timing of annual events to gradual changes in environmental conditions is necessary for population viability. However, adaptations to weather extremes are poorly documented in migratory species. Due to their vast seasonal movements, long-distance migrants face unique challenges in responding to changes as they rely on an endogenous circannual rhythm to cue the timing of their migration. Furthermore, the exact mechanisms that explain how environmental factors shape the migration schedules of long-distance migrants are often unknown...
April 4, 2017: BMC Ecology
https://www.readbyqxmd.com/read/28376798/effects-of-extreme-temperatures-on-cardiovascular-emergency-hospitalizations-in-a-mediterranean-region-a-self-controlled-case-series-study
#12
Anna Ponjoan, Jordi Blanch, Lia Alves-Cabratosa, Ruth Martí-Lluch, Marc Comas-Cufí, Dídac Parramon, María Del Mar Garcia-Gil, Rafel Ramos, Irene Petersen
BACKGROUND: Cold spells and heatwaves increase mortality. However little is known about the effect of heatwaves or cold spells on cardiovascular morbidity. This study aims to assess the effect of cold spells and heatwaves on cardiovascular diseases in a Mediterranean region (Catalonia, Southern Europe). METHODS: We conducted a population-based retrospective study. Data were obtained from the System for the Development of Research in Primary Care and from the Catalan Meteorological Service...
April 4, 2017: Environmental Health: a Global Access Science Source
https://www.readbyqxmd.com/read/28264774/combined-effects-of-climate-and-land-management-on-watershed-vegetation-dynamics-in-an-arid-environment
#13
Peilong Liu, Lu Hao, Cen Pan, Decheng Zhou, Yongqiang Liu, Ge Sun
Leaf area index (LAI) is a key parameter to characterize vegetation dynamics and ecosystem structure that determines the ecosystem functions and services such as clean water supply and carbon sequestration in a watershed. However, linking LAI dynamics and environmental controls (i.e., coupling biosphere, atmosphere, and anthroposphere) remains challenging and such type of studies have rarely been done at a watershed scale due to data availability. The present study examined the spatial and temporal variations of LAI for five ecosystem types within a watershed with a complex topography in the Upper Heihe River Basin, a major inland river in the arid and semi-arid western China...
March 3, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28187945/impact-of-ambient-temperature-on-morbidity-and-mortality-an-overview-of-reviews
#14
Xuping Song, Shigong Wang, Yuling Hu, Man Yue, Tingting Zhang, Yu Liu, Jinhui Tian, Kezheng Shang
The objectives were (i) to conduct an overview of systematic reviews to summarize evidence from and evaluate the methodological quality of systematic reviews assessing the impact of ambient temperature on morbidity and mortality; and (ii) to reanalyse meta-analyses of cold-induced cardiovascular morbidity in different age groups. The registration number is PROSPERO-CRD42016047179. PubMed, Embase, the Cochrane Library, Web of Science, the Cumulative Index to Nursing and Allied Health Literature (CINAHL), and Global Health were systematically searched to identify systematic reviews...
May 15, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28106161/cold-spells-and-ischaemic-sudden-cardiac-death-effect-modification-by-prior-diagnosis-of-ischaemic-heart-disease-and-cardioprotective-medication
#15
Niilo R I Ryti, Elina M S Mäkikyrö, Harri Antikainen, M Juhani Junttila, Eeva Hookana, Tiina M Ikäheimo, Marja-Leena Kortelainen, Heikki V Huikuri, Jouni J K Jaakkola
Sudden cardiac death (SCD) is the leading cause of death. The current paradigm in SCD requires the presence of an abnormal myocardial substrate and an internal or external transient factor that triggers cardiac arrest. Based on prior mechanistic evidence, we hypothesized that an unusually cold weather event (a cold spell) could act as an external factor triggering SCD. We tested potential effect modification of prior diagnoses and select pharmacological agents disrupting pathological pathways between cold exposure and death...
January 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/27922084/the-impact-of-cold-spells-on-mortality-and-effect-modification-by-cold-spell-characteristics
#16
Lijun Wang, Tao Liu, Mengjue Hu, Weilin Zeng, Yonghui Zhang, Shannon Rutherford, Hualiang Lin, Jianpeng Xiao, Peng Yin, Jiangmei Liu, Cordia Chu, Shilu Tong, Wenjun Ma, Maigeng Zhou
In China, the health impact of cold weather has received little attention, which limits our understanding of the health impacts of climate change. We collected daily mortality and meteorological data in 66 communities across China from 2006 to 2011. Within each community, we estimated the effect of cold spell exposure on mortality using a Distributed Lag Nonlinear Model (DLNM). We also examined the modification effect of cold spell characteristics (intensity, duration, and timing) and individual-specific factors (causes of death, age, gender and education)...
December 6, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27614359/winter-drought-impairs-xylem-phenology-anatomy-and-growth-in-mediterranean-scots-pine-forests
#17
J J Camarero, G Guada, R Sánchez-Salguero, E Cervantes
Continental Mediterranean forests face drought but also cold spells and both climate extremes can impair the resilience capacity of these forests. Climate warming could amplify the negative effects of cold spells by inducing premature dehardening. Here we capitalize on a winter drought-induced dieback triggered by a cold spell which occurred in December 2001 affecting Scots pine forests in eastern Spain. We assessed post-dieback recovery by quantifying and comparing radial growth and xylem anatomy of non-declining (ND, crown cover >50%) and declining (D, crown cover ≤50%) trees in two sites (VP, Villarroya de los Pinares; TO, Torrijas)...
December 2016: Tree Physiology
https://www.readbyqxmd.com/read/27586015/impacts-perceptions-and-management-of-climate-related-risks-to-cage-aquaculture-in-the-reservoirs-of-northern-thailand
#18
Louis Lebel, Phimphakan Lebel, Boripat Lebel
Weather is suspected to influence fish growth and survival, and be a factor in mass mortality events in cage aquaculture in reservoirs. The purpose of this study was to identify the important climate-related risks faced by cage aquaculture farms; evaluate how these risks were currently being managed; and explore how farmers might adapt to the effects of climate change. Fish farmers were interviewed across the northern region of Thailand to get information on impacts, perceptions and practices. Drought or low water levels, heat waves, cold spells and periods with dense cloud cover, each caused significant financial losses...
December 2016: Environmental Management
https://www.readbyqxmd.com/read/27570527/effects-of-recent-minimum-temperature-and-water-deficit-increases-on-pinus-pinaster-radial-growth-and-wood-density-in-southern-portugal
#19
Cathy B Kurz-Besson, José L Lousada, Maria J Gaspar, Isabel E Correia, Teresa S David, Pedro M M Soares, Rita M Cardoso, Ana Russo, Filipa Varino, Catherine Mériaux, Ricardo M Trigo, Célia M Gouveia
Western Iberia has recently shown increasing frequency of drought conditions coupled with heatwave events, leading to exacerbated limiting climatic conditions for plant growth. It is not clear to what extent wood growth and density of agroforestry species have suffered from such changes or recent extreme climate events. To address this question, tree-ring width and density chronologies were built for a Pinus pinaster stand in southern Portugal and correlated with climate variables, including the minimum, mean and maximum temperatures and the number of cold days...
2016: Frontiers in Plant Science
https://www.readbyqxmd.com/read/27479037/freezing-tolerance-revisited-effects-of-variable-temperatures-on-gene-regulation-in-temperate-grasses-and-legumes
#20
REVIEW
Mallikarjuna Rao Kovi, Åshild Ergon, Odd Arne Rognli
Climate change creates new patterns of seasonal climate variation with higher temperatures, longer growth seasons and more variable winter climates. This is challenging the winter survival of perennial herbaceous plants. In this review, we focus on the effects of variable temperatures during autumn/winter/spring, and its interactions with light, on the development and maintenance of freezing tolerance. Cold temperatures induce changes at several organizational levels in the plant (cold acclimation), leading to the development of freezing tolerance, which can be reduced/lost during warm spells (deacclimation) in winters, and attained again during cold spells (reacclimation)...
October 2016: Current Opinion in Plant Biology
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