Long-term effects of succession, climate change and insect disturbance on oak-pine forest composition in the U.S. Central Hardwood Region

2021 ◽  
Author(s):  
Shengwu Duan ◽  
Hong S. He ◽  
Martin A. Spetich ◽  
Wen J. Wang ◽  
Jacob S. Fraser ◽  
...  
Keyword(s):  
Climate Change ◽  
Pine Forest ◽  
Forest Composition ◽  
Long Term Effects ◽  
The U.S

scholarly journals Half a century of Scots pine forest ecosystem monitoring reveals long‐term effects of atmospheric deposition and climate change

2020 ◽  
Vol 26 (10) ◽  
pp. 5796-5815 ◽  
Author(s):  
Jörg Prietzel ◽  
Wolfgang Falk ◽  
Birgit Reger ◽  
Enno Uhl ◽  
Hans Pretzsch ◽  
...  
Keyword(s):  
Climate Change ◽  
Atmospheric Deposition ◽  
Scots Pine ◽  
Forest Ecosystem ◽  
Pine Forest ◽  
Long Term Effects ◽  
Ecosystem Monitoring ◽  
Scots Pine Forest

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 Distribution and Abundance of Double-crested Cormorants Nesting in the Interior of California, 2009–2012

Western Birds ◽  
2020 ◽  
Vol 51 (4) ◽  
pp. 270-292
Author(s):  
W. David Shuford ◽  
Kathy C. Molina ◽  
John P. Kelly ◽  
T. Emiko Condeso ◽  
Daniel S. Cooper ◽  
...  
Keyword(s):  
Climate Change ◽  
Sonoran Desert ◽  
Central Valley ◽  
The State ◽  
Salton Sea ◽  
Limited Data ◽  
Long Term Effects ◽  
Human Needs ◽  
Large Fluctuations

As part of an 11-state inventory, we censused the Double-crested Cormorant (Phalacrocorax auritus) in the interior of California from 2009 to 2012, using a combination of aerial, ground, and boat surveys. An estimated 8791 pairs breeding in the interior of the state in 2009–2012 exceeded the 7170 pairs estimated in 1998–1999. In both periods, cormorants were breeding in 9 of 11 ecoregions, but three-fourths were at one site—Mullet Island at the Salton Sea in the Sonoran Desert ecoregion (abandoned in 2014). The ecoregions with the next highest proportions were the Sacramento Valley, San Joaquin Valley, and Modoc Plateau. The apparent increase in numbers and colony sites since 1999—consistent with the pattern through much of western North America—reflects the (short-lived) increase in numbers at the Salton Sea, an increasing number of colonies and breeding pairs in the Central Valley, and slightly better coverage on the recent surveys. Because of practical survey constraints and limited data to date, evidence of change in numbers of Doublecrested Cormorants breeding in the interior of California between 1998–1999 and 2009–2012 is inconclusive. Plans for monitoring will need to take into account the effects of substantial annual variation in numbers, which may be associated with large fluctuations in cormorants’ prey base, short-term cycles of drought and flood, shifts of nesting cormorants into or out of the interior of California, and the expectation of greater environmental fluctuations with continuing climate change. The factors most likely to limit the number of cormorants breeding in the interior of the state are habitat loss or alteration (particularly from reallocation of water for human needs), disease, human disturbance, and the long-term effects of climate change.

scholarly journals Monitoring the compliance of the academic enterprise with the Fair Labor Standards Act

F1000Research ◽  
2016 ◽  
Vol 5 ◽  
pp. 2690 ◽  
Author(s):  
Adriana Bankston ◽  
Gary S. McDowell
Keyword(s):  
Graduate Students ◽  
Labor Standards ◽  
Long Term Effects ◽  
Science And Engineering ◽  
Department Of Labor ◽  
Fair Labor Standards Act ◽  
The U.S ◽  
Postdoctoral Researcher ◽  
Fair Labor

Background: On December 1 2016, the Fair Labor Standards Act (FLSA) will be updated by the U.S. Department of Labor. The key changes are an increase in the salary threshold for exemption from overtime for working more than 40 hours per week, and indexing the salary level so that it is updated automatically every 3 years. This update is predicted to have a profound effect on the academic enterprise as a large proportion of the postdoctoral researcher population is currently paid at a salary below the new threshold for exemption. Here we review the key changes to the FLSA, how they came about, and how the postdoctoral population is affected by the ruling. Methods: We describe recent data collection efforts (checking university websites and contacting HR departments) to uncover what institutions in the 2014 NSF Survey of Graduate Students and Postdoctorates in Science and Engineering are doing to comply with the FLSA ruling for postdocs. Results: Our data show that 41% of the estimated postdoctoral workforce in STEM and 57% of institutions checked have not decided or have no public decision yet available one month prior to implementation, and only 35.5% of institutions are planning to raise salaries to the new minimum. Conclusions: Our data show the uncertainty of postdoc salaries in the U.S. one month prior to implementation of the FLSA ruling. This implementation also gives rise to various issues that have arisen in an already strained research enterprise, including short-, medium- and long-term effects on academe.

Physiological and morphological effects of climate change

2019 ◽  
pp. 120-133 ◽  
Author(s):  
Andrew E. McKechnie
Keyword(s):  
Climate Change ◽  
Body Mass ◽  
High Temperatures ◽  
Arid Zone ◽  
Future Research ◽  
Long Term Effects ◽  
Adaptation To Climate Change ◽  
Heat Events

The direct impacts of higher temperatures on birds are manifested over timescales ranging from minutes and hours to years and decades. Over short timescales, acute exposure to high temperatures can lead to hyperthermia or dehydration, which among arid-zone species occasionally causes catastrophic mortality events. Over intermediate timescales of days to weeks, high temperatures can have chronic sub-lethal effects via body mass loss or reduced nestling growth rates, negatively affecting sev eral fitness components. Long-term effects of warming manifested over years to decades involve declining body mass or changes in appendage size. Key directions for future research include elucidating the role of phenotypic plasticity and epigenetic processes in avian adaptation to climate change, examining the role of stress pathways in mediating responses to heat events, and understanding the consequences of higher temperatures for species that traverse hot regions while migrating.

Innovative Enterprise Solves the Agency Problem

2019 ◽  
pp. 156-191
Author(s):  
William Lazonick ◽  
Jang-Sup Shin
Keyword(s):  
Agency Theory ◽  
Hedge Fund ◽  
Innovation Theory ◽  
Long Term Effects ◽  
Business Corporation ◽  
Innovative Enterprise ◽  
And Performance ◽  
Short Termism ◽  
The U.S

This chapter uses innovation theory to provide both a general theoretical critique and a selective empirical critique of the use of agency theory to rationalize the looting of the U.S. business corporation as enhancing economic efficiency. It focuses on three empirical works, Bebchuk and Fried, Pay Without Performance (2004); Bebchuk, Brav, and Jiang, “The Long-Term Effects of Hedge-Fund Activism” (2015); and Fried and Wang, “Short-Termism and Capital Flows” (2017). The chapter contends that MSV ideology as promulgated by agency theorists has contributed to inferior corporate and economic performance. It then argues that, for analyzing the operation and performance of the economy, innovation theory should replace agency theory.

scholarly journals A Framework to Advance the Understanding of the Ecological Effects of Extreme Climate Events

2019 ◽  
Vol 11 (21) ◽  
pp. 5954 ◽  
Author(s):  
Carlos Sanz-Lazaro
Keyword(s):  
Climate Change ◽  
Extreme Events ◽  
Ecological Effects ◽  
Rocky Shores ◽  
Long Term Effects ◽  
Starting Point ◽  
Experimental Approaches ◽  
Key Aspects ◽  
Climate Events

Climate change is modifying disturbance regimes, affecting the severity and occurrence of extreme events. Current experiments investigating extreme events have a large diversity of experimental approaches and key aspects such as the interaction with other disturbances, the timing, and long-term effects are not usually incorporated in a standardized way. This lack of comparability among studies limits advances in this field of research. This study presents a framework that is comprised of two experimental approaches designed to test expected changes on disturbance regime due to climate change. These approaches test the effects of disturbances becoming more clustered and more extreme. They use common descriptor variables regardless of the type of disturbance and ecosystem. This framework is completed with a compilation of procedures that increase the realism of experiments in the aforementioned key aspects. The proposed framework favours comparability among studies and increases our understanding of extreme events. Examples to implement this framework are given using rocky shores as a case study. Far from being perfect, the purpose of this framework is to act as a starting point that triggers the comparability and refinement of these types of experiments needed to advance our understanding of the ecological effects of extreme events.

Assessing state ESSA plans: Innovation or retreat?

2019 ◽  
Vol 101 (2) ◽  
pp. 8-13
Author(s):  
Patrick McGuinn
Keyword(s):  
Department Of Education ◽  
The Political ◽  
Approval Process ◽  
Long Term Effects ◽  
Implementation Challenges ◽  
State Accountability ◽  
Political Spectrum ◽  
Every Student Succeeds Act ◽  
The U.S

Three years after the passage of the Every Student Succeeds Act (ESSA), Patrick McGuinn reviews how the U.S. Department of Education has managed the approval process for state accountability plans, how state plans are shaping up as a result of their newfound flexibility, and what implementation challenges have emerged. States have required multiple iterations to submit plans that the Department of Education would approve, and state plans have met with criticism from multiple quarters and across the political spectrum. Some states have adopted new practices related to testing and which measures to use to assess schools. However, it is not yet clear what the long-term effects that the giving of greater flexibility to the states will have.

scholarly journals Effects of Climate Change on Epidemics of Powdery Mildew in Winter Wheat in China

Plant Disease ◽  
2017 ◽  
Vol 101 (10) ◽  
pp. 1753-1760 ◽  
Author(s):  
Xiuli Tang ◽  
Xueren Cao ◽  
Xiangming Xu ◽  
Yuying Jiang ◽  
Yong Luo ◽  
...  
Keyword(s):  
Climate Change ◽  
Relative Humidity ◽  
Powdery Mildew ◽  
Winter Wheat ◽  
Weather Conditions ◽  
Early Spring ◽  
Long Term Effects ◽  
Temperature Changes ◽  
Disease Epidemics

Powdery mildew is a highly destructive winter wheat pathogen in China. Since the causative agent is sensitive to changing weather conditions, we analyzed climatic records from regions with previous wheat powdery mildew epidemics (1970 to 2012) and investigated the long-term effects of climate change on the percent acreage (PA) of the disease. Then, using PA and the pathogen’s temperature requirements, we constructed a multiregression model to predict changes in epidemics during the 2020s, 2050s, and 2080s under representative concentration pathways RCP2.6, RCP4.5, and RCP8.5. Mean monthly air temperature increased from 1970 to 2012, whereas hours of sunshine and relative humidity decreased (P < 0.001). Year-to-year temperature changes were negatively associated with those of PA during oversummering and late spring periods of disease epidemics, whereas positive relationships were noted for other periods, and year-to-year changes in relative humidity were correlated with PA changes in the early spring period of disease epidemics (P < 0.001). Our models also predicted that PA would increase less under RCP2.6 (14.43%) than under RCP4.5 (14.51%) by the 2020s but would be higher by the 2050s and 2080s and would increase least under RCP8.5 (14.37% by the 2020s). Powdery mildew will, thus, pose an even greater threat to China’s winter wheat production in the future.

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