Home About Kuna Advertise Contact Us Kuna's Bureaus Services Term Of Use
Register Login
facebook Twitter Youtube rss
Kerry says US "will never give up" commitment to peace as Israel suspends Mideast talks      UN envoy to soon visit Syria, neighbouring countries to look into sexual violence      UN, regional sides praise Palestinian reconciliation deal as Israel suspends peace talks      Kuwait SE ends week on profit-taking, contrast and selling pressure      Ban "seriously concerned" that Russian-Ukraine crisis could spin out of control      Special Tribunal for Lebanon charges two journalists, two media groups for contempt of court      IMF welcomes launch of GCC-Stat      OPEC basket price drops 20 cents, reaching USD 104.99 pb      WHO launches Int'l Immunization Week      Kuwaiti crude price down 46 cents to USD 103.02 pb
  Geography
Lake eutrophication causes loss of fish species
17/02/2012   |   11:21 AM | World News
تصغير الخطالشكل الأساسيتكبير الخط

By Tamer Aboalenin

GENEVA, Feb 17 (KUNA) -- Eutrophication has led to a reduction of almost 40 percent in the number of endemic whitefish species in Swiss lakes, within a relatively short period of time.
Only in deep perialpine lakes least exposed to high nutrient inputs, such as Lakes Thun, Brienz and Lucerne, has the original diversity of endemic species been able to survive, a study by the Swiss Federal Institute of Aquatic Science and Technology (EAWAG) and the Swiss University of Bern said on Friday.
The study said that the decline in the diversity of whitefish species is not merely due to a loss of habitats but also due to the disappearance of species caused by the hybridization of formerly distinctive species.
In 1950 to 1980, the study explained that the eutrophication of Swiss lakes, where the bottom and deep waters were severely oxygen-depleted, deprived many species of their ecological niche.
The species, which had evolved since the last ice age, had to move to shallower waters. Here, they interbred with related species, thus losing their genetic and functional distinctiveness within a few generations, in a process known as speciation reversal.
The study demonstrates that eutrophication levels not only account for the loss of species but are also responsible for the loss of differentiation among the surviving species.
Evolutionary biologist Ole Seehausen, the lead author of the study, comments "Speciation reversal appears to be more widespread than has previously been supposed; this process involves the rapid disappearance of species which evolved over thousands of years by adaptation to specific ecological conditions.
"This means that the protection of biodiversity requires not only the conservation of existing species, but the protection of ecological and evolutionary processes which assure the maintenance of specialists and promote the generation of new species.
Whitefish are regarded as a model organism by the scientists involved in the study. Seehausen, who is affiliated with both Bern University and Eawag, said "We must assume that lake eutrophication has caused similar losses of diversity among other fish, and perhaps also among their invertebrate prey species." He also interprets this study as a warning to those in the fishing community who have recently called for the restriction of phosphorus elimination measures at wastewater treatment plants in the hope that fishing yields would be increased as a result of nutrient enrichment. (end) ta.nfm KUNA 171121 Feb 12NNNN

 Print
  Email
 Save
Share
Share


Most Read Most Emailed  
1.   Russia must take action for de-escalation in Ukraine -- Kerry
2.   Specialists convene in May on info-security, social media
3.   Turkey says might be forced to export Iraqi oil
4.   Lebanese army arrests Syrian rebels
5.   Violence in S. Pakistan claims 5 lives
6.   GCC youth, sports ministers meet in Kuwait Sunday
    Photo Gallery

Minister of Health Ali Al-Obeidi

UN Wise-men Committee Member Sheikh Mohammad Sabah Al-Salem Al-Sabah speaking at the opening session of the second GCC National Security and Regional Security Conference

Item displayed at the "The Hajj: Pilgrimage to Mecca" exhibition at the Arab World Institute (IMA) in Paris

Item displayed at the "The Hajj: Pilgrimage to Mecca" exhibition at the Arab World Institute (IMA) in Paris

Item displayed at the "The Hajj: Pilgrimage to Mecca" exhibition at the Arab World Institute (IMA) in Paris

His Highness the Prime Minister Sheikh Jaber Al-Mubarak Al-Hamad Al-Sabah with Minister of Housing Yasser Hassan Abul

Qadsia beats rival Kuwait in KBA Cup

head of programs and activities at KEPS Jinan Bahzad

Minister of Information Sheikh Salman Sabah Al-Salem Al-Sabah during the meeting

His Highness the Prime Minister Sheikh Jaber Mubarak Al-Hamad Al-Sabah received outgoing US Ambassador to Kuwait Mathew Tueller

His Highness the Amir Sheikh Sabah Al-Ahmad Al-Jaber Al-Sabah receives Sheikha Intisar Salem Al-Ali Al-Sabah

General Manager Ahmad Al-Mudhef

Secretary-General of the National Council for Culture, Arts and Letters (NCCAL) Ali Al-Yuha

Kuwait Stock Exchange (KSE)

His Highness the Amir Sheikh Sabah Al-Ahmad Al-Jaber Al-Sabah

UN Secretary General Ban Ki-moon
Publications

WEATHER
PRAYER
CURRENCIES
KUWAIT AIRPORT
    Calendar
About KUNA KUNA SERVICES USEFUL LINKS KUNA ARCHIVE KUNA PUBLICATIONS
Home
About Kuna
Advertise
Contact Us
Kuna's Bureaus
Services
Term Of Use
Read The Whole Newscast
Pictures (during the week)
FTP Service
KUNA training center
KUNA Reader
SMS Services
الكويت فى ذاكرة الأيام
Job Application
Careers
Arab News Agencies
International News Agencies
Governmental Institutes
Banks in Kuwait
News Paper
Local Companies
other useful links
Prayer Times
News Archive
Other News Services
Today In Kuwait's History
Events
Training Sessions
Videos
All KUNA right are reserved © 2012. This site is designed and published by IDS