Navigation Links
Have thieving rodents saved tropical trees?
Date:7/16/2012

Big seeds produced by many tropical trees were probably once ingested and then defecated whole by huge mammals called gomphotheres that dispersed the seeds over large distances. But gomphotheres were probably hunted to extinction more than 10,000 years ago. So why aren't large-seeded plants also extinct? A new Smithsonian report to be published in the early online edition of Proceedings of the National Academy of Sciences during the week of July 16, suggests that rodents may have taken over the seed dispersal role of gomphotheres.

By attaching tiny radio transmitters to more than 400 seeds, Patrick Jansen, scientist at the Smithsonian Tropical Research Institute and Wageningen University, and his colleagues found that 85 percent of the seeds were buried in caches by agoutis, common, house cat-sized rodents in tropical lowlands. Agoutis carry seeds around in their mouths and bury them for times when food is scarce.

Radio tracking revealed a surprising finding: when the rodents dig up the seeds, they usually do not eat them, but instead move them to a new site and bury them, often many times. One seed in the study was moved 36 times, traveling a total distance of 749 meters and ending up 280 meters from its starting point. It was ultimately retrieved and eaten by an agouti 209 days after initial dispersal.

Researchers used remote cameras to catch the animals digging up cached seeds. They discovered that frequent seed movement was primarily caused by animals stealing seeds from one another. Ultimately, 35 percent of the seeds ended up more than 100 meters from their origin. "Agoutis moved seeds at a scale that none of us had ever imagined," said Jansen.

"Previously, researchers had observed seeds being moved and buried up to five times, but in this system it seems that this re-caching behavior was on steroids," said Ben Hirsch, who ran the fieldwork as a post-doctoral fellow at the Smithsonian Tropical Research Institute in Panama. "By radio-tagging the seeds, we were able to track them as they were moved by agoutis, to find out if they were taken up into trees by squirrels, and to discover seeds inside spiny rat burrows. This resolution allowed us to gain a much better understanding of how each rodent species affects seed dispersal and survival."

By taking over the role of large Pleistocene mammals in dispersing these large seeds, thieving, scatter-hoarding agoutis may have saved these tree species from extinction.


'/>"/>

Contact: Sonia Tejada
tejadas@si.edu
202-633-4700 x28111
Smithsonian Tropical Research Institute
Source:Eurekalert  

Related biology news :

1. Africas Rift Valley saved by parks
2. Rodent robbers good for tropical trees
3. Native plant restoration not enough to maintain tropical dry forests in Hawaii
4. The absence of elephants and rhinoceroses reduces biodiversity in tropical forests
5. Palms reveal the significance of climate change for tropical biodiversity
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Have thieving rodents saved tropical trees?
(Date:3/15/2016)... ALBANY, New York , March 15, 2016 ... a new market report published by Transparency Market Research "Digital ... Growth, Trends and Forecast 2015 - 2023," the global digital ... at US$ 731.9 Mn in 2014 and is forecast to ... to 2023. Growth of micro, small and medium enterprises (MSMEs) ...
(Date:3/14/2016)... Allemagne, March 14, 2016 ... - --> - Renvoi : image disponible ... --> --> DERMALOG, ... fournit de nouveaux lecteurs d,empreintes digitales pour l,enregistrement ... DERMALOG sera utilisé pour produire des cartes d,identité ...
(Date:3/10/2016)... India , March 10, 2016 ... a new market research report "Identity and Access Management ... & Audit, Compliance, and Governance), by Organization Size, by ... to 2020", published by MarketsandMarkets, The market is estimated ... USD 12.78 Billion by 2020, at a Compound Annual ...
Breaking Biology News(10 mins):
(Date:5/3/2016)... CA (PRWEB) , ... May 03, 2016 , ... ... Playbook™ enterprise talent development, skill-building and compliance training platform on mobile devices, ... training course: Overview of Regulatory Requirements for Medical Devices. The course is essential ...
(Date:5/3/2016)... ... May 03, 2016 , ... ... CEO 2016 on May 31st and June 1st at The Four Seasons Hotel ... executives in the life sciences, offering exclusive access to key decision makers who ...
(Date:5/3/2016)... ... May 03, 2016 , ... Kerafast Inc., developers ... from laboratories across the globe, today announced the availability of a Zika virus ... research toward treatment and prevention measures for the Zika virus, the virus’s geographical ...
(Date:5/3/2016)... 3, 2016 - And Other ... Producers of Those Competitor Biologics  - Biosimilar ... and Prospects ,  Who are the most ... what are their sales potentials? Discover, in our updated ... trends, opportunities and revenue forecasting. Visiongain,s ...
Breaking Biology Technology: