Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Ocean climate predicts elk population in Canadian Rockies

11.05.2005


Mark Hebblewhite can look at specific climate statistics from the north Pacific Ocean and tell you how the elk are doing in Banff National Park. The University of Alberta doctoral student is the first researcher to show a correlation between the North Pacific Oscillation (NPO) and a mammal population.



Based on many climate-related ocean measurements, researchers are able to determine positive, average and negative NPO values. A positive NPO translates into a milder climate in most of western North America, but it means more severe weather in the mountain regions, where climate is more complex.

Hebblewhite analyzed the elk population in Banff National Park from 1985 to 2000 and cross-referenced his results with NPO values during that period. He found that positive NPO values translate into elk population declines in the park.


Severe weather in the mountains means colder and snowier conditions than usual. More snow is bad news for elk, which have heavy bodies and long, narrow legs and small hooves. The deeper the snow, the further they sink. Conversely, wolves have relatively light, sleek bodies and big, wide paws that act like snowshoes. In the Canadian Rockies, wolves rely on elk meat for 40 to 70 per cent of their diet.

"The elk are already at a deficit in the winter. There is less grass to eat, and their bodies have to work harder and use more energy to stay warm," said Hebblewhite, who studies in the U of A Department of Biological Sciences.

Cold, wet weather alone is enough to decrease an elk population, but when wolves are added to the environment, elk become especially vulnerable. Hebblewhite found that the combination of positive NPO values and wolf predation were related to 50 per cent declines in the elk population.

Hebblewhite noted that positive NPO values and severe weather in the Canadian Rockies are occurring more frequently, and the trend is likely related to global warming. However, he added that the elk are not a threatened because wolves, their main predator, cannot kill and eat fast enough to wipe out the whole population. Also, wolves tend to kill one another as their available prey dwindles, so a stasis is maintained naturally.

Nevertheless, Hebblewhite is excited about his findings because they provide a deeper understanding of the complex relationship between climate and ecosystem, and they open the door for more research in the area. The Atlantic Ocean climate has already been linked to ecosystem changes in Europe, Greenland and eastern North America, but Hebblewhite is a pioneer in working with NPO values.

"It’s important to figure out what climate change means to us in terms we can understand," he said. "The more we know, the more we can do to produce the outcomes we desire and prevent the ones we don’t."

In 2002, Hebblewhite won the Canon National Parks Scholarship for the Americas, an award worth $78,000 US over three years. More recently, he won the U of A Andrew Stewart Memorial Prize for his publication record as a grad student. He has authored seven published papers in the past four years. His research on the relationship between NPO values and the elk population in Banff National Park was published this spring in the Journal of Animal Ecology.

Ryan Smith | EurekAlert!
Further information:
http://www.ualberta.ca

More articles from Ecology, The Environment and Conservation:

nachricht 100 % Organic Farming in Bhutan – a Realistic Target?
15.06.2018 | Humboldt-Universität zu Berlin

nachricht What the size distribution of organisms tells us about the energetic efficiency of a lake
05.06.2018 | Leibniz-Institut für Gewässerökologie und Binnenfischerei (IGB)

All articles from Ecology, The Environment and Conservation >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: AchemAsia 2019 will take place in Shanghai

Moving into its fourth decade, AchemAsia is setting out for new horizons: The International Expo and Innovation Forum for Sustainable Chemical Production will take place from 21-23 May 2019 in Shanghai, China. With an updated event profile, the eleventh edition focusses on topics that are especially relevant for the Chinese process industry, putting a strong emphasis on sustainability and innovation.

Founded in 1989 as a spin-off of ACHEMA to cater to the needs of China’s then developing industry, AchemAsia has since grown into a platform where the latest...

Im Focus: First real-time test of Li-Fi utilization for the industrial Internet of Things

The BMBF-funded OWICELLS project was successfully completed with a final presentation at the BMW plant in Munich. The presentation demonstrated a Li-Fi communication with a mobile robot, while the robot carried out usual production processes (welding, moving and testing parts) in a 5x5m² production cell. The robust, optical wireless transmission is based on spatial diversity; in other words, data is sent and received simultaneously by several LEDs and several photodiodes. The system can transmit data at more than 100 Mbit/s and five milliseconds latency.

Modern production technologies in the automobile industry must become more flexible in order to fulfil individual customer requirements.

Im Focus: Sharp images with flexible fibers

An international team of scientists has discovered a new way to transfer image information through multimodal fibers with almost no distortion - even if the fiber is bent. The results of the study, to which scientist from the Leibniz-Institute of Photonic Technology Jena (Leibniz IPHT) contributed, were published on 6thJune in the highly-cited journal Physical Review Letters.

Endoscopes allow doctors to see into a patient’s body like through a keyhole. Typically, the images are transmitted via a bundle of several hundreds of optical...

Im Focus: Photoexcited graphene puzzle solved

A boost for graphene-based light detectors

Light detection and control lies at the heart of many modern device applications, such as smartphone cameras. Using graphene as a light-sensitive material for...

Im Focus: Water is not the same as water

Water molecules exist in two different forms with almost identical physical properties. For the first time, researchers have succeeded in separating the two forms to show that they can exhibit different chemical reactivities. These results were reported by researchers from the University of Basel and their colleagues in Hamburg in the scientific journal Nature Communications.

From a chemical perspective, water is a molecule in which a single oxygen atom is linked to two hydrogen atoms. It is less well known that water exists in two...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

Munich conference on asteroid detection, tracking and defense

13.06.2018 | Event News

2nd International Baltic Earth Conference in Denmark: “The Baltic Sea region in Transition”

08.06.2018 | Event News

ISEKI_Food 2018: Conference with Holistic View of Food Production

05.06.2018 | Event News

 
Latest News

Novel method for investigating pore geometry in rocks

18.06.2018 | Earth Sciences

Diamond watch components

18.06.2018 | Process Engineering

New type of photosynthesis discovered

18.06.2018 | Life Sciences

VideoLinks
Science & Research
Overview of more VideoLinks >>>