HOME >> BIOLOGY >> NEWS
The influence of disturbance on tropical rain forest biodiversity: End of a controversy in sight

These results, recently published in Science, provide better understanding of the dynamics of biodiversity in tropical rain forests. The many species which make up tropical rain forest tree communities show widely differing reactions to environmental factors. This is particularly so with regard to light. Pioneer species, highly heliophile (light-loving or shade-intolerant), establish themselves by taking advantage of canopy light gaps opened up by treefalls. Rapid growth, a feature of these species, enables them rapidly to form a new canopy suitable for more shade-tolerant species to colonize. The non-pioneer heliophiles are the first of these, followed by implantation of progressively more shade-loving trees as the canopy density increases.

The effect of disturbances of various intensities on tree species diversity was measured on forest regeneration. Researchers carried out an inventory of over 17 000 trees on a set of small forest plots, either subjected to different levels of commercial logging, or leaved untouched. Strong disturbances (such as intensive commercial logging), appear to favour pioneer species. If there are very little disturbances (fallen branches or only few and small canopy light gaps), the community is dominated by shade-loving species. Intermediate disturbances (more common or more extensive light gaps in untouched forests, only limited-scale logging) between the two extremes, induce peak diversity owing to the creation of a greater variety of ecological niches, some favourable to heliophilous trees, others better for shade-tolerant species. These results bring partly into question the findings that an American research team published in 1999 after investigations in Panama (2). This is the only other attempt to date to check the intermediate disturbance hypothesis at the same scale of observation. From the study of a 50-ha plot of natural forest, these researchers concluded that disturbance level had no effect on tree species diversit
'"/>

Contact: Jean-Franois Molino
molino@mpl.ird.fr
33-04-67 59-39-13
Institut de Recherche Pour le Dveloppement
10-Jan-2002


Page: 1 2 3

Related biology news :

1. Student science contest participation influences study, career choices, alumni say
2. Columbia research to examine gene influence on severity of peridontal disease, therapy response
3. What actually influences air pollution over the Indian Ocean?
4. Genes can influence both alcohol consumption and dependence
5. Parents are top influence on soft-drink consumption among kids
6. Environment influences learning: U of T study
7. Scientist honored for studies of genetic influence on chemotherapy, tumor development
8. Soy processing influences estrogen-dependent breast cancer growth in mice
9. Plankton may influence climate change says UCSB scientist
10. Ambient light influences the evolution of colour signals
11. Symposium examines the growing influence of aerosols on climate

Post Your Comments:
*Name:
*Comment:
*Email:


(Date:6/30/2017)... 30, 2017 Today, American Trucking Associations ... of face and eye tracking software, became the ... program. "Artificial intelligence and advanced ... monitor a driver,s attentiveness levels while on the ... to detect fatigue and prevent potential accidents, which ...
(Date:5/23/2017)... Italy , May 23, 2017  Hunova, the first robotic gym ... trunk, has been officially launched in Genoa, Italy . ... Europe and the USA . The technology ... on the market by the IIT spin-off Movendo Technology thanks to a ... the Multimedia News Release, please click: ...
(Date:5/6/2017)... 2017 RAM Group , Singaporean ... breakthrough in biometric authentication based on a ... to perform biometric authentication. These new sensors are based ... by Ram Group and its partners. This sensor will ... chains and security. Ram Group is a next ...
Breaking Biology News(10 mins):
(Date:8/16/2017)... , ... August 16, 2017 , ... ... microbe delivery system, announced it has secured $2M in funding from an impressive ... Angels, Carmen Innovations, and SVG Thrive Fund. With this investment, 3Bar is broadening ...
(Date:8/16/2017)... WAKEFIELD, Mass. , Aug. 16, 2017  This year,s edition of ... global leader in life sciences workforce solutions, has made the list for ... Inc. 5000 recognizes the nation,s fastest-growing private companies based on a set ... Fast 50, which includes the fastest-growing companies in the Bay ... Inc. 5000 ...
(Date:8/15/2017)... , Aug. 15, 2017 After spending the past two ... with crowdsourced data collection, GeneFo now offers this platform to healthcare ... and amplifying support, adherence, and data collection vis a vis their ... mark the successful launch of this offer. ... GeneFo ...
(Date:8/15/2017)... Diego, CA (PRWEB) , ... August 15, 2017 ... ... company pioneering graphene biosensors that accelerate pharmaceutical and biotherapeutics development, announces the launch ... the number of steps needed to gain kinetic binding data for a wide ...
Breaking Biology Technology:
Cached News: