Navigation Links
Trees' diminished resistance to tropical cyclone winds attributed to insect invasions
Date:1/31/2014

MANGILAO, GUAM--Guam experiences more tropical cyclones than any other state or territory in the United States. These cyclones--called typhoons in the western Pacific Ocean--can be devastating to Guam's dense native forests. The impact of large-scale tropical cyclones affects the health of managed and unmanaged forests, urban landscapes, and perennial horticulture plantings for many years after the actual storm. In fact, the island's forests are often called 'typhoon forests' because their health and appearance is inextricably defined by the most recent typhoons.

As recently as 2002, Cycas micronesica was the most abundant tree species in Guam. The species is recognized for its innate ability to recover from damage after a tropical cyclone. Resprouting on snapped tree trunks, or "direct regeneration", enabled C. micronesica to sustain its status as the most abundant tree in Guam through 2002. Although native tree species like C. micronesica possess traits that enable them to recover from tropical cyclone damage, invasive pests and other environmental challenges are compromising the species' resiliency.

Thomas Marler from the College of Natural and Applied Sciences at the University of Guam, and John Lawrence from the U.S. Department of Agriculture, Natural Resources Conservation Service reported on a large-scale study of Cycas micronesica in HortScience. The team compared the impact of two tropical cyclones--Typhoon Chaba in 2004, and Typhoon Paka in 1997--on the resilience and health of Cycas micronesica. They noticed that the proportion of trees exhibiting "mechanical failure" during Typhoon Chaba--in which peak wind speeds were less than half of those in Typhoon Paka--surpassed the damage documented during the more powerful Typhoon Paka. "We set out to determine how a tropical cyclone with moderate wind speeds could impose greater mechanical damage to a highly resistant tree species than a more powerful event only 7 years earlier," explained Marler.

Marler and Lawrence discovered that although Typhoon Paka compromised the ability of the C. micronesica canopy to avoid wind drag, it was alien invasions following Typhoon Paka that virtually eliminated C. micronesica's resilience to tropical cyclone damage. The data showed that stem decay caused by earlier damage from a native stem borer reduced the species' tolerance to external forces, resulting in stem failure in Typhoon Chaba. Invasions of two invasive insects (Aulacaspis yasumatsui in 2003 and Chilades pandava in 2005) were found to be responsible for the 100% mortality of the intact portions of the trees' snapped stems during the 5 years after Typhoon Chaba.

"A span of less than one decade allowed two alien invasions to eliminate the incipient resilience of a native tree species to tropical cyclone damage," the authors wrote. "This study underscores the fact that many years of observations after tropical cyclones are required to accurately determine [trees'] resilience."


'/>"/>

Contact: Mike W. Neff
mwneff@ashs.org
703-836-4606
American Society for Horticultural Science
Source:Eurekalert  

Related biology news :

1. Trees grow faster and store more carbon as they age
2. Iconic Australasian trees found as fossils in South America
3. Temperature found to be most significant driver of the worlds tallest trees
4. Slippery bark protects trees from pine beetle attack, according to CU-Boulder study
5. Significant advance reported with genetically modified poplar trees
6. The economically valuable sweet-gum trees: Taxonomy and 9 new combinations
7. Snow melts faster under trees than in open areas in mild climates
8. Mutual benefits: Stressed-out trees boost sugary rewards to ant defenders
9. Warm winters let trees sleep longer
10. Redwood trees reveal history of West Coast rain, fog, ocean conditions
11. Theres gold in them thar trees
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Trees' diminished resistance to tropical cyclone winds attributed to insect invasions
(Date:7/20/2017)... Delta (NYSE: DAL ) customers now can use ... Reagan Washington National Airport (DCA). ... Delta launches biometrics to board aircraft at Reagan Washington ... Delta,s biometric boarding pass experience that ... integrated into the boarding process to allow eligible Delta SkyMiles Members who ...
(Date:5/23/2017)... -- Hunova, the first robotic gym for the rehabilitation and functional motor sense ... Genoa, Italy . The first 30 robots will be available ... USA . The technology was developed and patented at the IIT ... Movendo Technology thanks to a 10 million euro investment from entrepreneur Sergio ... ...
(Date:4/24/2017)... , April 24, 2017 ... and partner with  Identity Strategy Partners, LLP (IdSP) ... "With or without President Trump,s March 6, 2017 ... Terrorist Entry , refugee vetting can be instilled with ... resettlement. (Right now, all refugee applications are suspended ...
Breaking Biology News(10 mins):
(Date:10/11/2017)... Oct. 11, 2017  VMS BioMarketing, a leading provider of ... oncology Clinical Nurse Educator (CNE) network, which will launch this ... communication among health care professionals to enhance the patient care ... staff, and other health care professionals to help women who ... ...
(Date:10/11/2017)... ... October 11, 2017 , ... A new study published ... frozen and fresh in vitro fertilization (IVF) transfer cycles. The multi-center ... success. , After comparing the results from the fresh and frozen transfer cohorts, ...
(Date:10/10/2017)... ... October 10, 2017 , ... ... antibody-drug conjugate (ADC) therapeutics, today confirmed licensing rights that give it exclusive ... a technology developed in collaboration with Children’s Hospital Los Angeles (CHLA). ...
(Date:10/10/2017)... 2017 International research firm Parks Associates announced today ... the TMA 2017 Annual Meeting , October 11 in ... home security market and how smart safety and security products impact the ... Parks Associates: Smart Home Devices: ... "The residential security market has experienced ...
Breaking Biology Technology: