Collapse of a desert bird community over the past century driven by climate change

Climate change has caused deserts, already defined by climatic extremes, to warm and dry more rapidly than other ecoregions in the contiguous United States over the last 50 years. Desert birds persist near the edge of their physiological limits, and climate change could cause lethal dehydration and hyperthermia, leading to decline or extirpation of some species. We evaluated how desert birds have responded to climate and habitat change by resurveying historic sites throughout the Mojave Desert that were originally surveyed for avian diversity during the early 20th century by Joseph Grinnell and colleagues. We found strong evidence of an avian community in collapse. Sites lost on average 43% of their species, and occupancy probability declined significantly for 39 of 135 breeding birds. The common raven was the only native species to substantially increase across survey sites. Climate change, particularly decline in precipitation, was the most important driver of site-level persistence, while habitat change had a secondary influence. Habitat preference and diet were the two most important species traits associated with occupancy change. The presence of surface water reduced the loss of site-level richness, creating refugia. The collapse of the avian community over the past century may indicate a larger imbalance in the Mojave and provide an early warning of future ecosystem disintegration, given climate models unanimously predict an increasingly dry and hot future

Checking the Checks: A Survey of Guest-Check Accuracy

Inaccurate guest checks represent lost revenue. And the frequency of check errors is higher than many restaurateurs might think

Hiding Private Locations by Anonymizing Data

Researchers explore ways of masking private locations in the interest of making useful data publicly available

Cooling requirements fueled the collapse of a desert bird community from climate change.

Climate change threatens global biodiversity by increasing extinction risk, yet few studies have uncovered a physiological basis of climate-driven species declines. Maintaining a stable body temperature is a fundamental requirement for homeothermic animals, and water is a vital resource that facilitates thermoregulation through evaporative cooling, especially in hot environments. Here, we explore the potential for thermoregulatory costs to underlie the community collapse of birds in the Mojave Desert over the past century in response to climate change. The probability of persistence was lowest for species occupying the warmest and driest sites, which imposed the greatest cooling costs. We developed a general model of heat flux to evaluate whether water requirements for evaporative cooling contributed to species' declines by simulating thermoregulatory costs in the Mojave Desert for 50 bird species representing the range of observed declines. Bird species' declines were positively associated with climate-driven increases in water requirements for evaporative cooling and exacerbated by large body size, especially for species with animal-based diets. Species exhibiting reductions in body size across their range saved up to 14% in cooling costs and experienced less decline than species without size reductions, suggesting total cooling costs as a mechanism underlying Bergmann's rule. Reductions in body size, however, are unlikely to offset the 50 to 78% increase in cooling costs threatening desert birds from future climate change. As climate change spreads warm, dry conditions across the planet, water requirements are increasingly likely to drive population declines, providing a physiological basis for climate-driven extinctions

Southeast Utah Turfgrass Management Calendar

This is a calendar for turfgrass management for southeast Utah and includes guidelines for seeding, overseeding, sodding, fertilization, mowing, aeration, weed control, and irrigation

St. George, Utah, Turfgrass Management Calendar

This is a calendar for turfgrass management for St. George, Utah, and includes guidelines for seeding, overseeding, sodding, fertilization, mowing, aeration, weed control, and irrigation

The bacteriophage carrier state of Campylobacter jejuni features changes in host non-coding RNAs and the acquisition of new host-derived CRISPR spacer sequences

Incorporation of self-derived CRISPR DNA protospacers in Campylobacter jejuni PT14 occurs in the presence of bacteriophages encoding a CRISPR-like Cas4 protein. This phenomenon was evident in carrier state infections where both bacteriophages and host are maintained for seemingly indefinite periods as stable populations following serial passage. Carrier state cultures of C. jejuni PT14 have greater aerotolerance in nutrient limited conditions, and may have arisen as an evolutionary response to selective pressures imposed during periods in the extra-intestinal environment. A consequence of this is that bacteriophage and host remain associated and able to survive transition periods where the chances of replicative success are greatly diminished. The majority of the bacteriophage population do not commit to lytic infection, and conversely the bacterial population tolerates low-level bacteriophage replication. We recently examined the effects of Campylobacter bacteriophage/C. jejuni PT14 CRISPR spacer acquisition using deep sequencing strategies of DNA and RNA-Seq to analyze carrier state cultures. This approach identified de novo spacer acquisition in C. jejuni PT14 associated with Class III Campylobacter phages CP8/CP30A but spacer acquisition was oriented toward the capture of host DNA. In the absence of bacteriophage predation the CRISPR spacers in uninfected C. jejuni PT14 cultures remain unchanged. A distinct preference was observed for incorporation of self-derived protospacers into the third spacer position of the C. jejuni PT14 CRISPR array, with the first and second spacers remaining fixed. RNA-Seq also revealed the variation in the synthesis of non-coding RNAs with the potential to bind bacteriophage genes and/or transcript sequences

Grassroots Market Research on Grass: Predicting Cannabis Brand Performance Using Social Media Scraping

[EN] Social media listening has become a useful tool to marketers in studying behavior for a wide variety of consumer applications, from political leanings and drug abuse to common product choices. Although most cannabis products are illegal at the U.S. Federal level, it is legal in 30 states for medical use and 8 states and the District of Columbia for recreational use. Despite the legal issues, cannabis is projected to reach over $31 billion in sales world-wide by 2021. The industry is both rapidly evolving and highly fragmented, making it challenging for companies operating in the space to access the insights and the data to help design communications, product development and branding strategies. The research presented here will show that the application of social media listening can be helpful for cannabis brand marketers to gauge size, scope and nuances of these markets and tailored social media mining can accurately predict a brand’s future performance. Later research will show that social media scraping will help identify and segment consumers at a fraction the cost of traditional consumer research methods.Kregor, J.; Gomez, B.; Kelly, JS.; Stevenson, K. (2018). Grassroots Market Research on Grass: Predicting Cannabis Brand Performance Using Social Media Scraping. En 2nd International Conference on Advanced Reserach Methods and Analytics (CARMA 2018). Editorial Universitat Politècnica de València. 201-208. https://doi.org/10.4995/CARMA2018.2018.8348OCS20120

Partnerships as a potential means of increasing the production of hardwood timber on NIPF lands in North Mississippi

North Mississippi has significant hardwood timber resources. Hardwood timber in the region has traditionally been an important source of raw material for furniture and other wood-based industries. In recent years, however, demand has greatly increased for hardwood timber for use in the pulp and paper industry, resulting in increased harvest levels of pole-sized and small sawtimber-sized hardwoods in the region. Increased harvests of hardwood timber have given rise to concerns about the longerterm availability of hardwoods that are large enough in size to be efficiently converted into lumber and other solid wood products. Futures options, futures contracts, leases, and limited partnerships were initially considered for potential application to increase the longer-term production of hardwood sawtimber on nonindustrial private forest (NIPF) lands in North Mississippi. Considering the resource, the NIPF ownership, and the timber markets involved, limited partnerships were chosen for further evaluation. Results of informal discussions involving hardwood sawmill operators, private landowners, and timberland investment firm representatives are presented. A discussion follows, assessing the acceptability and attributes of partnerships in contrast to other possible options such as long-term leases as a positive influence for investment in the long-term production of hardwood sawtimber in North Mississippi

Southwest Utah Turfgrass Management Calendar

This is a calendar for turfgrass management for southwest Utah and includes guidelines for seeding, overseeding, sodding, fertilization, mowing, aeration, weed control, and irrigation