Navigation Links
New clues found linking larger animals to colder climates
Date:2/24/2010

HOUSTON, Feb. 24, 2010 Thanks to a pair of University of Houston researchers who found a possible new solution to a 163-year-old puzzle, ecological factors can now be added to physiology to explain why animals grow bigger in the cold.

Their results were published in the February issue of the American Naturalist, offering new insight to Bergmann's rule that animals grow larger at high, cold latitudes than their counterparts closer to the equator. While traditional explanations have been based on body temperature being the driving force of this phenomenon, this group of community ecologists hypothesize that better food makes high-latitude animals bigger.

Chuan-Kai Ho, a Ph.D. graduate from UH in ecology and evolution, his adviser and UH professor of biology and biochemistry Steven Pennings, and their collaborator Thomas Carefoot from the University of British Columbia opened up a new line of study into Bergmann's rule. The research program in Pennings' lab over the last decade has offered the most extensive work done on the general problem of latitudinal variation in plant-herbivore interactions. This latest finding from Pennings' groundbreaking research at UH on this subject came from one of Ho's doctoral dissertation chapters.

"Because the American Naturalist is one of the top journals in our field, publishing at this level is a mark of great success for a Ph.D. student," Pennings said. "It's also a reflection of the strength of our graduate program in the ecology and evolution division of UH's department of biology and biochemistry."

Ho, now a postdoctoral student at Texas A&M at Galveston's Armitage & Quigg Laboratory, also has another chapter from his UH dissertation on salt marsh food webs published in Ecology, another top journal in the field. Pennings received a doctoral dissertation improvement grant for Ho in 2007-2008 from the National Science Foundation that provided funding for Ho to run chemical analyses on leaves from different latitudes to assess their nutritional content.

Studying three different plant-eating species grasshoppers, planthoppers and sea snails collected from along the Atlantic coast to Japan, respectively, the researchers fed these herbivores plants from both high and low latitudes and found that they all grew better when fed plants from the higher latitudes. This indicates that Bergmann's rule could reflect that plants from high latitudes provide better food than those from low latitudes. These latest findings, according to Ho, indicate that studies of Bergmann's rule should consider ecological interactions in addition to the more traditional theories of physiology based on responses to temperature.

Over the years, work in Pennings' lab has shown that, although low-latitude plants are less nutritious and better protected by chemical defenses, they experience heavy damage from herbivores, which are more abundant at low latitudes. Future study, Pennings adds, should focus on why there are more herbivores at lower latitudes despite the lower-quality food sources. A likely explanation is that herbivore populations are limited at high latitudes by a short growing season and high death rates during cold winters.

"While the explanations discovered in our current study only apply to herbivores, it may be that carnivores and omnivores also might grow larger as a consequence of eating larger herbivores," Ho said. "Examining such patterns and underlying mechanisms in nature will help us understand what currently is going on and what might happen down the line to our ecosystems."


'/>"/>

Contact: Lisa Merkl
lkmerkl@uh.edu
713-743-8192
University of Houston
Source:Eurekalert  

Related medicine news :

1. Investigators uncover intriguing clues to why persistent acid reflux sometimes turns into cancer
2. Online Epidemic Gives Clues to Bird Flu Spread
3. New knock-out gene model provides molecular clues to breast cancer
4. New clues to breast cancer development in high-risk women
5. Clues to Cell Death Could Fight Disease
6. Genes Give Clues to Newborn Lung Disease
7. Mouse Study Gives Clues to Colitis
8. VivoMetrics LifeShirt Going to South Pole to Uncover Clues to High-Altitude Illness
9. Protein Gives Clues to Pancreatic Cancer
10. A longer-living, healthier mouse that could hold clues to human aging
11. Clues to ensuring anti-HIV drugs are taken in Africa
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
New clues found linking larger animals to colder climates
(Date:3/24/2017)... ... March 24, 2017 , ... ... (ONS) wanted to create a communications platform that positions them as the go-to ... and ONS reinvented their online publication as an always-on, always-fresh news, views and ...
(Date:3/24/2017)... ... March 24, 2017 , ... The law firm of ... is pleased to announce Westchester resident Lauren C. Enea has joined the firm as ... firm, will concentrate her practice in elder law, Medicaid planning and applications, and Wills, ...
(Date:3/24/2017)... ... March 24, 2017 , ... Empower Brokerage, ... their training and leads programs. , In February, 2017, Empower Brokerage introduced their ... Performance Partners is designed to teach how to maximize their sales efforts, as ...
(Date:3/24/2017)... ... 2017 , ... “End Time GPS”: a dauntless and enlightened study of ... GPS” is the creation of published author, Wesley Gerboth, a World War II veteran, ... space-vehicle projects. Now, at age ninety-one, he shares the Wisdom God bestowed upon him ...
(Date:3/24/2017)... ... March 24, 2017 , ... “The Adventures of Joey, The Dog ... dog who lives his life to the fullest, as God intended. “The Adventures of ... Holmgren, a mother and grandmother pursuing her passion for writing, especially about truth and ...
Breaking Medicine News(10 mins):
(Date:3/24/2017)...   The Accreditation Council for Medical Affairs ... the pharmaceutical industry has appointed Dr. Jane ... formed scientific advisory board. Dr. Chin will be ... ever medical affairs think tank within the pharmaceutical ... ACMA, please visit  www.medicalaffairsspecialist.org .  Connect with ...
(Date:3/24/2017)... FinancialBuzz.com News Commentary  ... According to new data published Arcview ... legal cannabis market is projected to continue to grow at ... the current presidential administration. The report created by Arcview,s data ... growth in this industry are the passage and subsequent implementation ...
(Date:3/24/2017)... -- Research and Markets has announced the addition of the ... their offering. ... pipeline is very strong with a total of 97 drug candidates. Pharma ... Sanofi are involved in the development of the IPF therapeutics. The IPF ... III stage, 15 are in Phase II stage, 12 are in Phase ...
Breaking Medicine Technology: