Navigation Links
Conservation of freshwater fish biodiversity: a challenge for the countries of the South
Date:3/26/2008

the relative influence of the particular characteristics of each ecosystem and human activities on the diversity of the non-native fish species. Three hypotheses were tested: the biotic resistance, biotic acceptance and human activity. The first suggests that a high diversity of freshwater fish in the host ecosystem acts as a barrier to the establishment of non-native fish specie populations. The second postulates conversely that, for a given ecosystem, non-native species diversity follows that of native species because favourable ecological conditions for the latter are also suitable for the newly arrived species. As for the third, it takes account of the different indicators at river-basin scale (gross domestic product, percentage of land urbanized, population density), that can yield determination of the relation between anthropic pressure and non-native species diversity.

The three hypotheses relative weight was measured using statistical methods. For the whole set of river basins investigated, the environmental conditions of fluvial ecosystems were found to have practically no influence on the exotic species diversity. On the contrary, it is the human factors, and especially the intensity of economic activities measured by the GDP, which determine the number of non-native species present in a river basin. These results thus suggest that the economic development foreseen in the developing countries should be accompanied by a rise in the number of non-native freshwater fish species. Given that biological invasions are considered as one of the main causes of biodiversity loss, such a scenario would probably be detrimental to the aquatic biodiversity conservation of these regions. This study indicates that exceptional river ecosystems, like the Amazon Basin in South America or that of the Congo in central Africa, are still hardly affected by species introduction. For example, no more than 1% of the 3000 species of fish recorded in the River Amazon are non-nat
'/>"/>

Contact: Gregory Flechet
fichesactu@paris.ird.fr
33-014-803-7607
Institut de Recherche Pour le Dveloppement
Source:Eurekalert

Page: 1 2 3

Related biology news :

1. Rwanda conservation effort to link isolated chimps to distant forest
2. Nations and conservation groups seek plan to protect Ghost of the Himalayas
3. Open-access tropical conservation journal launches
4. Scripps expedition provides new baseline for coral reef conservation
5. 2008 Pew Fellowship in Marine Conservation awarded to Dr. Marie-Joëlle Rochet from IFREMER
6. 2008 Pew Fellowship in Marine Conservation awarded to Fan Meng; first Chinese fellow
7. 2008 Pew Fellowship in Marine Conservation awarded to Dr. Ussif Rashid Sumaila
8. Dr. Andrew Constable awarded 2008 Pew Fellowship in marine conservation
9. 2008 Pew Fellowship in marine conservation awarded to UM Rosenstiels Dr. Andrew Baker
10. Pew Institute for Ocean Science awards 5 fellowships in support of global marine conservation
11. Conservation strategies must shift with global environmental change, says CU-Boulder study
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:5/9/2008)...ngs presented at the May 2008 Pediatric Academic S...Joint Meeting indicate that childhood and adolesce... function, which relates to cardiac health. , Ob...ng the past 20 years and obesity in adults has bee...of obesity in children is also increasing and many...
(Date:5/9/2008)...ngineer has won a share of grants totalling over 1...ual move, Dr. Declan Bates, a senior lecturer in t...Leicester, is co-recipient of 1,068,000 in the for...ering and Physical Sciences Research Council (EPSR...ical Sciences Research Council (BBSRC). , The gr...
(Date:5/8/2008)...ar mechanisms by which plants protect themselves f...unlight during photosynthesis, a team of researche...elps control the flow of solar energy moving throu...iscovery holds important implications for the futu...t could provide the world with a sustainable and s...
(Date:5/8/2008)...versity of Miami (UM) students have received prest...onal Science Foundation (NSF) for their doctoral w...Soffer will each receive three years of support fo..., an assistant professor in the Division of Marine... Marine and Atmospheric Science. In addition, a t...
Breaking Biology News(10 mins):Study supports reason for concern in childhood and adolescent obesity 2Engineer to spearhead research into cell metabolism and medical injuries 2Berkeley researchers identify photosynthetic dimmer switch 2Berkeley researchers identify photosynthetic dimmer switch 3Berkeley researchers identify photosynthetic dimmer switch 4Everything's coming up corals 2Everything's coming up corals 3Super Bowl Champion Pro Bowler and Pittsburgh Steeler Alan Faneca to Host Sixth Annual Bid for Hope Auction 1787 1Super Bowl Champion Pro Bowler and Pittsburgh Steeler Alan Faneca to Host Sixth Annual Bid for Hope Auction 1787 2NEWSWEEK 3A Cover 3A Giving Globally 3A How to Heal the World 1785 1NEWSWEEK 3A Cover 3A Giving Globally 3A How to Heal the World 1785 2NEWSWEEK 3A Cover 3A Giving Globally 3A How to Heal the World 1785 3Vitamin E trials fatally flawed 522 1Vitamin E trials fatally flawed 522 2Vitamin E trials fatally flawed 522 3Cataract Surgery 3A A Bargain Despite the Price 1780 1Cataract Surgery 3A A Bargain Despite the Price 1780 2Cataract Surgery 3A A Bargain Despite the Price 1780 3
...lier linked to a rare disease plays a critical rol...age and break down, new evidence reported in the M... the mechanism underlying healthy fat metabolism a...nown as Chanarin-Dorfman Syndrome (CDS), who carry...espread buildup of fat in tissues throughout their...
...Izaurrralde and colleagues (EMBL; Max-Planck-Insti...new mechanistic insight into gene silencing by miR... the July 15th issue of G&D, and also will be ...NAs (miRNAs) are a novel class of small regulatory... mRNA targets. , Dr. Izaurralde and colleagues de...
...s at New York University,s Courant Institute of Ma... that enhances the ability to detect a cancer gene...of tumor-suppressor genes involved in lung cancer....ips that can scan hundreds of patients, genomes to...s will appear in the July issue of the American Jo...
...s at Northwestern University have pinpointed a bra... interesting speculation over the purpose of sleep... In a paper to be published June 8 by the journal...essor of neurobiology and physiology, shows that t...ep regulation in the fruitfly Drosophila melanogas...
Other Biology News:Gene linked to rare disease activates fat breakdown 2NYU algorithm enhances ability to detect cancer genes 2NYU algorithm enhances ability to detect cancer genes 3
(Date:5/9/2008)...wswire-FirstCall/ -- Genaera,Corporation (Nasdaq: ...the,quarter ended March 31, 2008. The net loss for..., or $(0.24) per basic and diluted share, as compa...basic and diluted share, for,the quarter ended Mar...expenses for the quarter ended March,31, 2008 were...
(Date:5/9/2008)...HIA, May 9 /-,Shire plc (LS...armaceutical,company, announces that ordinary shar...ed in a circular to shareholders dated 16 April 20...eting convened by the Court and,held today., At a...is expected to,approve the scheme of arrangement, ...
(Date:5/9/2008)... May 9 /- Genetic,Immunity, a US/Hung...pment,of its patented nanomedicines for targeted i...any will be presenting at the Rodman & Renshaw 5th...y 19-20, 2008 at the Le,Meridien Beach Plaza Hotel...nd Chief Executive Officer, Dr. Julianna Lisziewic...
(Date:5/9/2008)...The International Center for Adult,Stem Cell Educa...ay announced that,it has officially launched a glo...s program at the 3rd International Spinal Cord Inj...nd Rehabilitation to be held today, May,9th, throu...ICASCE will be,headquartered in Fort Worth, Texas,...
Breaking Biology Technology:Genaera Corporation Announces First Quarter Financial Results 2Genaera Corporation Announces First Quarter Financial Results 3Genaera Corporation Announces First Quarter Financial Results 4Results of Court Meeting and Extraordinary General Meeting - Shareholders Approve Scheme of Arrangement and New Share Plans 2Results of Court Meeting and Extraordinary General Meeting - Shareholders Approve Scheme of Arrangement and New Share Plans 3Results of Court Meeting and Extraordinary General Meeting - Shareholders Approve Scheme of Arrangement and New Share Plans 4Results of Court Meeting and Extraordinary General Meeting - Shareholders Approve Scheme of Arrangement and New Share Plans 5Genetic Immunity To Present at the Rodman & Renshaw 5th Annual Global Healthcare Conference 2International Center for Adult Stem Cell Education Debuts at Spinal Cord Injury Symposium in Greece 2
...rick O,Malley, D.O. established his practice, O,Ma... Milwaukee) in 2001.He envisioned that practicing ...zed care to his patients. But, how can a solo prac...thcare industry? "Keeping my overhead low is essen...rage advanced technology solutions to maximize the...
...bining database and personalized print technology,... kind of house call to retain patients. Instead of... treatment, these physicians are sending personali...check-ups and screenings -- and seeing response ra...part of a health network, worked with Customer Pot...
...-- Panelists at the Demo 2003 conference offered i...swering Producer, Chris Shipley,s question, "If we...ig innovations?" , ,Mitch Kapor, Chairman of the O... Lotus, began the discussion by stating, "I would ...e, its where the IT industry was 20 years ago." , ...
...EMO 2003 continued to buzz with innovation and exc...f new technologies that included timely next-gener...ational IT infrastructure as well as collaboration... an array of new product demonstrations, technolog... "big thing" in a morning panel devoted to the ind...
Other Biology Technology:Computer Card Supports Solo Doctor 2CPM Helps Physicians Group Retain Patients with New Kind of House Call 2Industry Veterans take a look back from 2025: Bio-Technology, and Bio-Informatics are the focus 2DEMO 2003 Closes with Focus on Collaboration and Communication 2DEMO 2003 Closes with Focus on Collaboration and Communication 3DEMO 2003 Closes with Focus on Collaboration and Communication 4
Glucagon-like peptide-1 (GLP-1 (1-36) amide)
...roarray service for systematic discovery of small ...ng RNAs (ncRNAs) using a novel Paraflo technology ... sensitive and specific direct detection of small ...om probe design (according to submitted target RNA...
...ase analysis service utilizing high density protei...esized on Paraflo microfluidic chips for proteomic...of kinase kinetic activities, and drug discovery r...ration of your kinase sample, single or dual color...
...OligoMix for low cost, high throughput DNA synthes...synthetic biology, drug discovery, and microarray ...ber of DESIGNED synthetic DNA oligonucleotide sequ... made from an innovative method of synthesis (1,2)...
Biology Products: