Home About Kuna Advertise Contact Us Kuna's Bureaus Services Term Of Use
Register Login
facebook Twitter Youtube rss
His Highness The Amir sends cable of condolences to Zambia's vice-president      Kuwaiti oil barrel up 67 cents, reaches USD 81.71      Ban condemns Sudan hostilities      US, Israeli officials discuss ISIL, Iran      Obama urges protection of Rohingya rights in Burma      Global forum urges implementation of program of action for youth      Jordan int'l calls pressurize Israel to reopen Haram Al-Sharif to Muslims      Arab Nat'l Security seminar urges need to address threats collectively      US urges Israel: Haram Al-Sharif "must be re-opened to Muslim worshippers"      Palestinian leader, Arab League hail Swedish recognition of Palestine
  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
Honoring Kuwait 2014


KUNA publishes a book titled (His Highness Sheikh Sabah Al-Ahmad Al-Jaber Al-Sabah: A Humanitarian Leader) to commemorate the UN honoring of Kuwait's leader

kuna magazien


Most Read Most Emailed  
1.   Ronaldo wins 3 awards in La Liga ceremony
2.   Turkey to combat antiquities smuggling from Iraq, Syria - Celik
3.   Kosovo FM lauds relations with Kuwait
4.   15 Syrian regime personnel killed in North Syria -- monitor
5.   Global oil USD 25 decline will cause GDP eight pct drop for GCC - IMF's Lagarde
6.   Russia calls for ending Israeli settlement policy
    Photo Gallery

Kuwaiti author Mai Al Nakib

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

Kuwait Stock Exchange (KSE)

Kuwaiti Ambassador to Mexico Johar Hayat with new Mexican Senator

Kuwait's Ambassador to Italy praises Rome International Film Festival

Ayman Al-Ali, the head of the award higher committee Offers a commemorative shield to Editorial Director

Kuwait's Abdullah Al-Muzayen

His Highness the Prime Minister Sheikh Jaber Al-Mubarak Al-Hamad Al-Sabah

National Assembly Speaker Marzouq Ali Al-Ghanim

His Highness the Amir Sheikh Sabah Al-Ahmad Al-Jaber Al-Sabah commences parliament's 3rd regular session of 14th

His Highness the Amir Sheikh Sabah Al-Ahmad Al-Jaber Al-Sabah commences parliament's 3rd regular session of 14th

Kuwait's Ambassador to Jordan Hamad Al-Duaij offers donation to Al-Quds Open University

His Highness the Prime Minister Sheikh Jaber Mubarak Al-Hamad Al-Sabah during the cabinet in its weekly meeting

Minister of Information and Minister of State for Youth Affairs Sheikh Salman Sabah Salem Al-Humoud Al-Sabah

Commissioner for Financial Programming and Budget Jacek Dominik

(OPEC)

Undersecretary of the Foreign Ministry Khaled Al-Jarallah

The State Audit Bureau Chairman Abdulaziz Al-Adsani

OPEC
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