It’s the little things- An interview with the Guest Editors of our Microbial Ecology of Changing Environments Call for Papers

PLOS ONE has an open Call for Papers on the Microbial Ecology of Changing Environments, with selected submissions to be featured in an upcoming Collection. We aim to highlight a range of interdisciplinary articles showcasing

ESCAIDE 2019 – A Smörgåsbord of Infectious Disease Epidemiology

ESCAIDE 2019 [Credit: ECDC](The title is an homage to the host country of the conference – Sweden – where the smörgåsbord is a buffet-style meal served on a large table. In English, the term has also adopted a

Editors’ Picks 2019

As the end of the year draws in, PLOS ONE Staff Editors put together a list of some their favourite papers from 2019. Behavioral and Social Sciences, Neuroscience, Mental Health In an archaeological investigation, Ehud

From Penguins to Frogs: The new frontier of wildlife microbiomes

With recent technological advances in DNA sequencing investigating microbiomes from all areas of life has become possible as PLOS ONE Publication Assistant Maija Mallula finds out. With the advancement of DNA sequencing technology, our ability

All Dried Up? Modeling the Effects of Climate Change in California’s River Basins

Mono Lake
Whether you are trapped inside because of it, or mourning the lack of it, water is on everyone’s mind right now. Too much snow in the Midwest and Northeast has been ruining travel plans, while too little snow is limiting Californians’ annual ski trips. No one wants to drive three hours only to find a rocky hillside where their favorite slope used to be.

It’s hard to deny that abnormal things are happening with the weather right now. Recently, Governor Jerry Brown officially declared a state of emergency in California due to the drought and suggested that citizens cut water usage by 20%. With no relief in sight, it is important not only to regulate our current water use, but also to reevaluate our local programs and policies that will affect water usage in the future. So, how do we go about making these decisions without being able to predict what’s next? A recently published PLOS ONE article may offer an answer in the form of a model that allows us to estimate how potential future climate scenarios could affect our water supply.


Researchers from UC Berkeley and the Stockholm Environmental Institute’s (SEI) office in Davis, CA built a hydrology simulation model of the Tuolumne and Merced River basins, both located in California’s Central Valley (pictured above). Their focus was on modeling the sensitivity of California’s water supply to possible increases in temperature. When building the model, the authors chose to incorporate historical water data, current water use regulations, and geographical information to estimate seasonal water availability across the Central Valley and the San Francisco Bay Area. They then ran various water availability scenarios through the model to predict how the region could be affected by rising temperatures.

Using estimated temperature increases of 2°C, 4°C, and 6°C, the model predicted earlier snowmelts, leading to a peak water flow earlier in the year than in previous years. The model also forecasted a decreased river flow due to increased evapotranspiration (temperature, humidity, and wind speed). The water supply was also estimated to drop incrementally with each temperature increase, though it is somewhat cushioned by the availability of water stored in California’s reservoirs.


The authors used an existing model as an initial structure, and built upon it to include information on local land surface characteristics, evapotranspiration, precipitation, and runoff potential. Surrounding water districts were modeled as nodes and assigned a priority according to California’s established infrastructure and legislation. Using this information, the authors state that the tool is equipped to estimate monthly water allocation to agricultural and urban areas and compare it to historical averages for the same areas.

Though a broad model, the authors present it as a case study that provides estimates of longer-term water availability for the Central Valley and Bay Area, and encourage other areas to modify its design to meet the needs of their unique locales. Those of us looking for more specific predictions can also use the tool to create models with additional information and refined approximations, allowing flexibility for future changes in land use and policy. For now, we might have a good long-term view of our changing water supply and a vital tool as we race to keep up with our ever-changing world.

Citation: Kiparsky M, Joyce B, Purkey D, Young C (2014) Potential Impacts of Climate Warming on Water Supply Reliability in the Tuolumne and Merced River Basins, California. PLoS ONE 9(1): e84946. doi:10.1371/journal.pone.0084946

Image 1 Credit: Mono Lake by Stuart Rankin

Image 2 Credit: Figure 1 pone.0084946

Image 3 Credit: Figure 2 pone.0084946

The post All Dried Up? Modeling the Effects of Climate Change in California’s River Basins appeared first on EveryONE.

Crisis in the Late Bronze Age Triggered by Environmental Change


What does it take to topple a civilization, or a whole group of them? Over three thousand years ago, agriculture and trade-based societies flourished in the Eastern Mediterranean. Yet something fishy happened circa 1200 BC that brought these cultural and commercial centers to their knees—something that has left historians in the dark.

Correspondence from that time attributes the decline, at least partially, to invasions from a band of raiders, referred to as Sea Peoples. Other scholars studying this period point to natural disasters, such as earthquakes or drought. Research recently published in PLOS ONE reveals a more insidious culprit: Climate change may have fueled drought, the invasions, and eventually the collapse of these civilizations in what historians call the Late Bronze Age crisis.

To explore the environmental factors behind this crisis, the researchers took continuous core samples from modern-day Cyprus, at what is now called Larnaca Salt Lake, or Hala Sultan Tekke.


Core samples were analyzed for their pollen content and tested for the presence of dinoflagellates (pictured), a type of marine plankton. The researchers then studied the abundance and variety of plants represented by the ancient pollen and plotted fluctuations in the proportions of both between 1500 BC and 1500 AD. With similar data from nearby Syria, they reconstructed likely climate conditions in the region during the Late Bronze Age.

They found the abundance of marine plankton decreased around 1200 BC, suggesting the region was gradually becoming drier, as the lake lost its connection to the sea.  The pollen record reveals a shift towards plants that could handle drier weather, indicating a decrease in rainfall. Dwindling rain, the researchers suggest, may have made it difficult to maintain agricultural production and led to food shortages. These shortages might also have caused people to travel, migrate, or raid in search of more food.  This drought lasted three hundred years and coincides with the Sea People invasions.

It takes a lot to topple civilizations, and climate change has played its part in ending those in the Eastern Mediterranean during the Late Bronze Age. This evidence adds to the growing body of literature documenting the effects of climate change. This latest research adds a compelling chapter to the story of climate change, from which everyone can learn.


Citation: Kaniewski D, Van Campo E, Guiot J, Le Burel S, Otto T, et al. (2013) Environmental Roots of the Late Bronze Age Crisis. PLoS ONE 8(8): e71004. doi:10.1371/journal.pone.0071004


Keuninck (Coninck) Kerstiaen de – Fire of Troy, from Wikimedia

DINOFLAGELLATE, by fickleandfreckled

Heating up the Science Behind PLOS’ New Climate Change Collection

Satellite images of penguin colonies in the southern Ross Sea

From penguin colonies in Antarctica, to California birds and North Carolina bugs, this month PLOS ONE focuses on the far-reaching aspects of climate change. In conjunction with the annual meeting of the Ecological Society of America (ESA), PLOS ONE and PLOS Biology unrolled a new collection of 16 research articles, curated by PLOS ONE Academic Editor, Ben Bond-Lamberty. The collection, “Ecological Impact of Climate Change”, features many articles that made a splash in the media. Here are some of the highlights:

Spring flowers are blooming earlier now than they did in the past. In a recent study, researchers compared the average flowering time for native species in Massachusetts and Wisconsin to data recorded by notable American naturalists Henry David Thoreau and Aldo Leopold. These native species have shown remarkable flowering shifts, especially during recent years: In 1865, Thoreau observed the highbush blueberry flowering in mid-May; in 2012, researchers observed this species flowering six weeks earlier in early April. For more about this study, visit National Geographic, NPR, and MSNBC.

Like spring flowers, corals also react to increasing temperatures, but to a much more ghostly effect. When pressured by unusually warm or polluted waters, corals shed the algae that enliven them with color, becoming white.

Tioman Island, Malaysia, Acropora colony

New research suggests that this phenomenon, known as coral bleaching and often fatal for coral colonies, may not be as devastating as expected: Coral colonies that survived previous coral bleaching were much more likely to rebound successfully the next time it occurred. An astounding 95% of Acropora, a coral species highly susceptible to bleaching, survived at a research site in Singapore in 2010. Read more about these tough coral taxa, in the New York Times blog.

Summer days are heating up in the city, too, and urban, tree-dwelling insects are thriving as a result. A recent PLOS ONE article reports that scale insects like Parthenolecanium quercifex are 13 times more numerous in the hottest parts of Raleigh, North Carolina, than in cooler, neighboring rural areas.

Scale Bugs CCBY Aug blog

And these scaly squatters don’t stop once they settle down. Researchers also found that urban scale insects were four times more abundant when placed in hot greenhouse conditions than rural scale insects in the same conditions. The Atlantic Cities and Discovery News have more on this and other urban insects studies.

As temperatures continue to rise, researchers in this PLOS ONE study integrated climate change threats with traditional conservation concerns by comparing the vulnerability of California’s birds in relation to the predicted effects of climate change over the coming years. Of the 29 threatened-bird taxa considered in the state of California, these researchers determined 21 of those 29 (72%) are considered vulnerable to climate change. Lucky for us and the birds who call those most vulnerable coastal environments home, the findings of this study can be used as an assessment tool to foster future conservation efforts. For more local and international coverage, check out KQED News and the Huffington Post.

Read Ben Bond-Lamberty’s overview of the Collection, learn how climate change may impact coffee plants, or more from the PLOS Blogs network. View the entire Collection here. For more news on PLOS ONE papers headlining in August, dive into our Media Tracking Project.


Ellwood ER, Temple SA, Primack RB, Bradley NL, Davis CC (2013) Record-Breaking Early Flowering in the Eastern United States. PLoS ONE 8(1): e53788. doi:10.1371/journal.pone.0053788

Guest JR, Baird AH, Maynard JA, Muttaqin E, Edwards AJ, et al. (2012) Contrasting Patterns of Coral Bleaching Susceptibility in 2010 Suggest an Adaptive Response to Thermal Stress. PLoS ONE 7(3): e33353. doi:10.1371/journal.pone.0033353

Meineke EK, Dunn RR, Sexton JO, Frank SD (2013) Urban Warming Drives Insect Pest Abundance on Street Trees. PLoS ONE 8(3): e59687. doi:10.1371/journal.pone.0059687

Gardali T, Seavy NE, DiGaudio RT, Comrack LA (2012) A Climate Change Vulnerability Assessment of California’s At-Risk Birds. PLoS ONE 7(3): e29507. doi:10.1371/journal.pone.0029507

Image 1: Satellite images of penguin colonies in the southern Ross Sea. doi:10.1371/journal.pone.0060568

Image 2: Tioman Island, Malaysia, Acropora colony. doi:10.1371/journal.pone.0033353

Image 3: Ants and sapsuckers by John Tann


Coffee Plants Don’t Like It Hot

Guest blogger Atreyee Bhattacharya is a science correspondent and climate scientist, currently a research affiliate at the Department of Earth and Planetary Sciences, Harvard University. 

espressoLike most, I like my coffee black and piping hot. Coffee plants, however, may not be as fond of the heat.

When thinking about the impact of changing climate (increased droughts, wilder fluctuations in seasons) and increasing pest activity on food production—my thoughts tend toward crops such as rice, wheat, and corn. Not so much wine, chocolate, or coffee, though I probably consume more coffee throughout the day than I do these other staples.

However, two recent papers published in PLOS ONE deliver a double whammy to coffee, or more particularly the Coffea arabica plant, a species that today accounts for more than 70 percent of the world’s coffee. (Another, less common, variety is C. robusta, which has twice the caffeine content.)

In a 2011 study, Juiliana Jaramilo from the University of Hannover and her coauthors, Figure 2showed that warming air and land temperatures can change the distribution of the coffee berry borer Hypothenemus hampei in East African C. arabica producing regions.

The borer, a pest that attacks coffee beans, “causes losses exceeding US $500 million annually, and worldwide affects many of the more than 25 million rural households involved in coffee production” the study reports. A serious infestation can lower coffee production by more than three times!

Until about ten years ago, reports of H. hampei attacks on coffee plants growing above 1500 m (the preferred altitude of cultivated and naturally occurring C. arabica) were few and far between. But thanks to the 0.2-0.5 degrees Celsius temperature increase in coffee growing regions of East Africa, the pests are now found at higher altitude plantations as well.

As temperatures continue to rise as per projections from the  Intergovernmental Panel on Climate Change (IPCC), coffee borer infestations in this region are likely to spread  farther. Increasing temperatures will increase the number of H.hampei generations each year from 1-4.5 to 5-10 or more.

“These outcomes will have serious implications for C. arabica production and livelihoods in East Africa,” caution the authors, adding, “We suggest that the best way to adapt to a rise of temperatures in coffee plantations could be via the introduction of shade trees in sun grown plantations.”

Figure 3Though C. arabica plants do like to grow in the shade; another study indicates that this protection may still not be enough to combat the threat of warming temperatures. According to this research by Aaron Davis from the Royal Botanic Gardens in the United Kingdom, warming temperatures may make several localities within southwest Ethiopia and neighboring regions climatologically ill-suited to growing C. arabica.

“Based on known occurrences and ecological tolerances of Arabica, bioclimatic unsuitability would place populations in peril, leading to severe stress and a high risk of extinction,” write the researchers.

According to their estimates, the most favorable outcome of warming is a 65% decrease in areas with climate suitable for coffee plantations, and at worst, an almost 100% loss of these regions by 2080. In terms of available area for growing coffee, the most favorable outcome  is a 38% reduction in suitable space, and at worst a 90% reduction. Neighboring areas could fare even worse by as early as 2020.

Coffee is a 90-billion-dollar industry , but it is an industry that depends on long-term planning. The beans that we grind every morning today were planted about 7-10 years ago, and our morning brew a decade hence depends on today’s plantations.

Demand for coffee continues to rise in our ‘coffee culture’, and C. arabica still constitutes about 75-80% of the world’s coffee production. C. arabica is believed to be the first species of coffee to be cultivated, well over a thousand years ago. It epitomizes an incredible journey, and is one beverage that is certainly worth a second thought as rising temperatures threaten its existence.

Read these studies and more on the ecological impacts of climate change in the new PLOS Collection:

Citations:Jaramillo J, Muchugu E, Vega FE, Davis A, Borgemeister C, et al. (2011) Some Like It Hot: The Influence and Implications of Climate Change on Coffee Berry Borer (Hypothenemus hampei) and Coffee Production in East Africa. PLoS ONE 6(9): e24528. doi:10.1371/journal.pone.0024528

Davis AP, Gole TW, Baena S, Moat J (2012) The Impact of Climate Change on Indigenous Arabica Coffee (Coffea arabica): Predicting Future Trends and Identifying Priorities. PLoS ONE 7(11): e47981. doi:10.1371/journal.pone.0047981


Espresso by Richard Masoner on Flickr 

Distribution of the coffee berry borer (Hypothenemus hampei) in Eastern Africa under current climate. The EI values (0–100), indicates unsuitability of the location’s climate (0), and a ‘perfect’ climate for the given species (100). doi:10.1371/journal.pone.0024528.g001

Predicted and actual distribution of indigenous Arabica. Green dots show recorded data-points. Colored areas (yellow to red) show predicted distribution based on modeling. A context map is given in the top left hand corner. doi:10.1371/journal.pone.0047981.g001