scholarly journals Geographic variation in adult and embryonic desiccation tolerance in a terrestrial-breeding frog

2018 ◽  
Author(s):  
T.S. Rudin-Bitterli ◽  
J.P. Evans ◽  
N.J. Mitchell
Keyword(s):  
Climate Change ◽  
Geographic Variation ◽  
Desiccation Tolerance ◽  
Swimming Performance ◽  
Clinal Variation ◽  
Rainfall Gradient ◽  
Change Models ◽  
Environmental Perturbations ◽  
Specific Variation ◽  
Almost All

ABSTRACTIntra-specific variation in the ability of individuals to tolerate environmental perturbations is often neglected when considering the impacts of climate change. Yet this information is potentially crucial for mitigating any deleterious effects of climate change on threatened species. Here we assessed patterns of intra-specific variation in desiccation tolerance in the frogPseudophryne guentheri, a terrestrial-breeding species experiencing a drying climate. Adult frogs were collected from six populations across a rainfall gradient and their dehydration and rehydration rates were assessed. We also compared desiccation tolerance of embryos and hatchlings originating from within-population parental crosses from four of the six populations, where selection on desiccation tolerance should be especially strong given that embryos cannot move to escape unfavourable microclimates. Embryos were reared on soil at three soil-water potentials, ranging from wet to dry (ψ = −10, −100 & −400 kPa), and their desiccation tolerance was assessed across a range of traits including survival, time to hatch after inundation, wet mass at hatching, hatchling malformations and swimming performance. We found significant and strong patterns of intra-specific variation in almost all traits, both in adults and first generation offspring. Adult frogs exhibited clinal variation in their water balance responses, with populations from drier sites both dehydrating and rehydrating more slowly compared to frogs from more mesic sites. Similarly, desiccation tolerance of embryos and hatchlings was significantly greater in populations from xeric sites. Taken together, our findings suggest that populations within this species will respond differently to the regional reduction in rainfall predicted by climate change models. We emphasise the importance of considering geographic variation in phenotypic plasticity when predicting how species will respond to climate change.

Geographic Variation in U.S. Climate Change Opinion at State and Local Scales

2014 ◽  
Author(s):  
Peter D Howe ◽  
Matto Mildenberger ◽  
Jennifer R. Marlon ◽  
Anthony Leiserowitz
Keyword(s):  
Climate Change ◽  
Geographic Variation ◽  
State And Local

The geography of climate migration

2021 ◽  
pp. 1-37
Author(s):  
Michał Burzyński ◽  
Frédéric Docquier ◽  
Hendrik Scheewel
Keyword(s):  
Climate Change ◽  
International Migration ◽  
First Century ◽  
Long Term Effects ◽  
Mobility Data ◽  
Rural And Urban ◽  
Working Age ◽  
Internal Mobility ◽  
Almost All

Abstract In this paper, we investigate the long-term effects of climate change on the mobility of working-age people. We use a world economy model that covers almost all the countries around the world, and distinguishes between rural and urban regions as well as between flooded and unflooded areas. The model is calibrated to match international and internal mobility data by education level for the last 30 years, and is then simulated under climate change variants. We endogenize the size, dyadic, and skill structure of climate migration. When considering moderate climate scenarios, we predict mobility responses in the range of 70–108 million workers over the course of the twenty-first century. Most of these movements are local or inter-regional. South–South international migration responses are smaller, while the South–North migration response is of the “brain drain” type and induces a permanent increase in the number of foreigners in OECD countries in the range of 6–9% only. Changes in the sea level mainly translate into forced local movements. By contrast, inter-regional and international movements are sensitive to temperature-related changes in productivity. Lastly, we show that relaxing international migration restrictions may exacerbate the poverty effect of climate change at origin if policymakers are unable to select/screen individuals in extreme poverty.

scholarly journals Historical climate controls soil respiration responses to current soil moisture

2017 ◽  
Vol 114 (24) ◽  
pp. 6322-6327 ◽  
Author(s):  
Christine V. Hawkes ◽  
Bonnie G. Waring ◽  
Jennifer D. Rocca ◽  
Stephanie N. Kivlin
Keyword(s):  
Climate Change ◽  
Soil Moisture ◽  
Soil Respiration ◽  
Carbon Cycling ◽  
Large Scale ◽  
Microbial Respiration ◽  
Rainfall Gradient ◽  
Soil Microbial ◽  
Historical Climate ◽  
Moisture Dependence

Ecosystem carbon losses from soil microbial respiration are a key component of global carbon cycling, resulting in the transfer of 40–70 Pg carbon from soil to the atmosphere each year. Because these microbial processes can feed back to climate change, understanding respiration responses to environmental factors is necessary for improved projections. We focus on respiration responses to soil moisture, which remain unresolved in ecosystem models. A common assumption of large-scale models is that soil microorganisms respond to moisture in the same way, regardless of location or climate. Here, we show that soil respiration is constrained by historical climate. We find that historical rainfall controls both the moisture dependence and sensitivity of respiration. Moisture sensitivity, defined as the slope of respiration vs. moisture, increased fourfold across a 480-mm rainfall gradient, resulting in twofold greater carbon loss on average in historically wetter soils compared with historically drier soils. The respiration–moisture relationship was resistant to environmental change in field common gardens and field rainfall manipulations, supporting a persistent effect of historical climate on microbial respiration. Based on these results, predicting future carbon cycling with climate change will require an understanding of the spatial variation and temporal lags in microbial responses created by historical rainfall.

scholarly journals Robust increase of Indian monsoon rainfall and its variability under future warming in CMIP-6 models

2020 ◽  
Author(s):  
Anja Katzenberger ◽  
Jacob Schewe ◽  
Julia Pongratz ◽  
Anders Levermann
Keyword(s):  
Climate Change ◽  
Global Warming ◽  
Climate Models ◽  
Monsoon Rainfall ◽  
Global Climate ◽  
Coupled Model ◽  
Global Climate Models ◽  
Future Climate Change ◽  
Global Mean Temperature ◽  
Almost All

Abstract. The Indian summer monsoon is an integral part of the global climate system. As its seasonal rainfall plays a crucial role in India's agriculture and shapes many other aspects of life, it affects the livelihood of a fifth of the world's population. It is therefore highly relevant to assess its change under potential future climate change. Global climate models within the Coupled Model Intercomparison Project Phase 5 (CMIP-5) indicated a consistent increase in monsoon rainfall and its variability under global warming. Since the range of the results of CMIP-5 was still large and the confidence in the models was limited due to partly poor representation of observed rainfall, the updates within the latest generation of climate models in CMIP-6 are of interest. Here, we analyse 32 models of the latest CMIP-6 exercise with regard to their annual mean monsoon rainfall and its variability. All of these models show a substantial increase in June-to-September (JJAS) mean rainfall under unabated climate change (SSP5-8.5) and most do also for the other three Shared Socioeconomic Pathways analyzed (SSP1-2.6, SSP2-4.5, SSP3-7.0). Moreover, the simulation ensemble indicates a linear dependence of rainfall on global mean temperature with high agreement between the models and independent of the SSP; the multi-model mean for JJAS projects an increase of 0.33 mm/day and 5.3 % per degree of global warming. This is significantly higher than in the CMIP-5 projections. Most models project that the increase will contribute to the precipitation especially in the Himalaya region and to the northeast of the Bay of Bengal, as well as the west coast of India. Interannual variability is found to be increasing in the higher-warming scenarios by almost all models. The CMIP-6 simulations largely confirm the findings from CMIP-5 models, but show an increased robustness across models with reduced uncertainties and updated magnitudes towards a stronger increase in monsoon rainfall.

scholarly journals CLIMATE CHANGE IMPACT ON MOUNTAIN BIODIVERSITY: A SPECIAL REFERENCE TO GILGIT-BALTISTAN OF PAKISTAN

2016 ◽  
Vol 1 ◽  
pp. 53
Author(s):  
S. Ishaq ◽  
M. Z. Khan ◽  
F. Begum ◽  
K. Hussain ◽  
R. Amir ◽  
...  
Keyword(s):  
Climate Change ◽  
Natural Resources ◽  
Special Reference ◽  
Current Knowledge ◽  
Knowledge Gap ◽  
Change Models ◽  
Impact Of Climate Change ◽  
The Government ◽  
Gilgit Baltistan ◽  
The Impact

Climate Change is not a stationary phenomenon; it moves from time to time, it represents a major threat to mountainous biodiversity and to ecosystem integrity. The present study is an attempt to identify the current knowledge gap and the effects of climate change on mountainous biodiversity, a special reference to the Gilgit-Baltistan is briefly reviewed. Measuring the impact of climate change on mountain biodiversity is quite challenging, because climate change interacts with every phenomenon of ecosystem. The scale of this change is so large and very adverse so strongly connected to ecosystem services, and all communities who use natural resources. This study aims to provide the evidences on the basis of previous literature, in particular context to mountain biodiversity of Gilgit-Baltistan (GB). Mountains of Gilgit-Baltistan have most fragile ecosystem and are more vulnerable to climate change. These mountains host variety of wild fauna and flora, with many endangered species of the world. There are still many gaps in our knowledge of literature we studied because very little research has been conducted in Gilgit-Baltistan about climate change particular to biodiversity. Recommendations are made for increased research efforts in future this including jointly monitoring programs, climate change models and ecological research. Understanding the impact of climate change particular to biodiversity of GB is very important for sustainable management of these natural resources. The Government organizations, NGOs and the research agencies must fill the knowledge gap, so that it will help them for policy making, which will be based on scientific findings and research based.

Climate Change

2017 ◽  
Author(s):  
Peter Mason
Keyword(s):  
Climate Change ◽  
Rain Forest ◽  
Fossil Fuels ◽  
Mass Tourism ◽  
Major Threat ◽  
The World ◽  
Tourism Activity ◽  
The Stability ◽  
Almost All ◽  
Main Attraction

Climate change poses a major threat to almost all forms of human activity on earth, including tourism. As Holden (2016: 227) argues: Of all the challenges facing tourism’s relationship with nature, it is not an exaggeration to state that climate change represents the greatest. Holden gives as his rationale for this statement that it is the stability and predictability of climate that is vital for the environments and ecosystems that are required for the continuation of current types of tourism, whether these are the traditional form of mass tourism, in terms of ‘sun, sea and sand’ holidays, or a niche activity which involves visiting a tropical rain forest with rare flora and fauna as the main attraction. Climate change also presents opportunities for tourism. If areas currently experiencing cool winters and mild summers get warmer, then new types of tourism may be possible including beach-based holidays where at present these are of little importance. Climate change is likely to lead to modifications in the weather at different times of the year so ‘seasonality’ which is currently a very important dimension to many forms of tourism will be affected, probably to the extent that seasons when there is high tourism activity will get longer in some parts of the world. Although tourism is likely to be significantly affected by climate change, it has also contributed to climate change through for example the burning of fossil fuels in transport for tourism as well through the use of power in hotel accommodation.

scholarly journals Impacts of climate warming on forests in Ontario: Options for adaptation and mitigation

2000 ◽  
Vol 76 (1) ◽  
pp. 139-149 ◽  
Author(s):  
C. S. Papadopol
Keyword(s):  
Climate Change ◽  
Climate Warming ◽  
Temperature Increase ◽  
Forest Ecosystems ◽  
Current Knowledge ◽  
Risk Environment ◽  
International Consensus ◽  
Change Models ◽  
Wide Range ◽  
Key Words Climate Change

This paper summarizes current knowledge about the optical properties of greenhouse gases and general climate-warming influences. It explains the influence of this new phenomenon on the major ecosystems of the world, and considers the process of deforestation. It then analyzes the warming trends in Ontario based on data from two weather stations with continuous records of more than 120 years, to determine the rate of warming in the Great Lakes-St. Lawrence Region. The results indicate a temperature increase of about 0.76 °C per century and an 8% increase in annual total precipitation.Current climate change models indicate that for a scenario of 2 × CO2 levels some general, probable prognoses can be made, including a temperature increase of up to 4.5 °C, which might be disastrous for existing forest ecosystems. Specifically, the consequences of climate warming on (a) northward shifts of ecological conditions, (b) forest productivity, and (c) forest physiology and health, are examined. In the context of global warming, the paper then recommends practical management measures necessary to ensure adaptation of existing forest ecosystems to the warming that is already developing. These measures are intended to provide a no-risk environment for existing forests until rotation age. Next, a wide range of mitigative measures is examined with a view to securing the long-term preservation of forest ecosystems to avoid major ecological disruptions and, gradually, to reverse climate warming. Application of these measures requires international consensus, but countries that apply these recommendations first have a chance to profit from them due to the "CO2 fertilization" effect. Key words: climate change, silviculture, forest management

scholarly journals Multitude in Cultural Complexities in Asia

2018 ◽  
Vol 41 ◽  
pp. 02001
Author(s):  
Johannes Widodo
Keyword(s):  
Climate Change ◽  
Social Justice ◽  
Continuous Process ◽  
Environmental Issues ◽  
Essential Elements ◽  
Urban Morphology ◽  
Planning Profession ◽  
Scale Levels ◽  
Almost All ◽  
Historical Periods

The genesis of human settlements is a continuous process of production and layering of patterns, forms and spaces in different scale levels across historical periods. Our urban morphology is the product of the cosmopolitan communities, the articulation of the multi layered tangible and intangible urban traditions and modernization processes. Diversity, eclecticism, fusion, acculturation, adaptation, are the nature of our architecture and urbanism. However, at present, we are in an urgent need to find resolutions to address serious problems posed by the climate change, ideological conflicts, economic greediness, depletion of resources, and social justice. One of an essential elements in humanity is empathy, and this empathy has been anesthetized or lost due to ignorance and greed in almost all aspects of our relationships with others and nature. The design and planning profession and education should reflect on the mistakes that have been created which have caused cultural, social, and environmental issues. We need to reconsider our present practices, i.e., to reflect on, to interrogate and perhaps to present alternatives to our existing pedagogical paradigm.

CLIMATE-CHANGE STUDIES IN THE MAYA AREA

2002 ◽  
Vol 13 (1) ◽  
pp. 79-84 ◽  
Author(s):  
Joel D. Gunn ◽  
Ray T. Matheny ◽  
William J. Folan
Keyword(s):  
Climate Change ◽  
Environmental Change ◽  
Annual Meeting ◽  
Maya Lowlands ◽  
Change Models ◽  
Modern Times ◽  
The Past ◽  
Cultural Paradigms ◽  
Physical Forces ◽  
Maya Area

The series of papers on climate change published in this issue are the result of the symposium “Environmental Change in Mesoamerica: Physical Forces and Cultural Paradigms in the Preclassic to Postclassic,” held at the 63rd Annual Meeting of the Society for American Archaeology in March 2000 in Philadelphia. The authors bring their expertise in paleoclimatological studies to bear on the Maya Lowlands and Highlands from the beginning of the Holocene to the Postclassic and modern times. The studies reveal that climate has changed during the past 4,000 years to a considerable degree that correlates in a reasonable way with archaeological periodizations. Several climate-change models are presented as an effort to understand better past cultural and natural events.

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