Home About Kuna Advertise Contact Us Kuna's Bureaus Services Term Of Use
Register Login
facebook Twitter Youtube rss
Over 20 Houthis killed in Al-Qaeda attack SE Yemen      Lebanon won't receive further Syrian refugees -- Min.      6 airstrikes in Syria, 6 in Iraq target ISIL -- CENTCOM      Parliament speaker meets sports officials      Great progress for camel racing in GCC - Sheikh Sultan Al Nahyan      KSE closes Monday's session on mixed board      Tunisia commends Kuwait's contribution to health care      Ebola kills UN staff in Sierra Leone      Parliament speaker visits Faisal Al-Duweesh at Farwaniya Hospital      Saudi Health Min. calls for protective measures against Coronavirus
  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 magazine


Most Read Most Emailed  
1.   Palestinians will take legal action against attackers of Al-Aqsa mosque - Abbas
2.   Kuwait crude oil price down to USD 80.01 pb
3.   8 ISIL fighters killed in ambush in Kobane
4.   College of Social Sciences opens 4th conf. on psychology
5.   Kuwait involved in implementing UN Post-2015 Development Agenda -- diplomat
6.   Oil price may drop further, least effects on Kuwait, S. Arabia
    Photo Gallery

Chairperson of Women's Affairs Committee at the Kuwaiti Cabinet Sheikha Latifa Al-Fahad Al-Salem Al-Sabah

), Director of Ghiras Student Project, Dr. Ammar Al-Hussaini

the ministry's Assistant Undersecretary for development Abdulrahman Al-Mutairi

Ghiras Executive Director Ahmad Al-Shatti

Dr. Ali Shehab

Bad weather causing low visibility in Kuwait City

Bad weather causing low visibility in Kuwait City

Foreign Minister Sheikh Sabah Khaled Al-Hamad Al-Sabah

Prime Minister Shinzo Abe

Ministry of Information's Assistant Undersecretary for News Sector Affairs Faisal Al-Mutalakem

Kuwait Credit Bank (formerly the Kuwait Credit and Savings Bank) Director-General Salah Al-Modhaf

OPEC

MMA's striking and ground techniques

third secretary of the permanent Kuwaiti mission at the UN, Abdullah Ahmad Al-Sharrah.

His Highness the Crown Prince Sheikh Nawaf Al-Ahmad Al-Jaber Al-Sabah

His Highness the Amir Sheikh Sabah Al-Ahmad Al-Jaber Al-Sabah with Canadian Foreign Affairs Minister John Baird

oil expert and economist Bashir Alya

Under-Secretary General for Humanitarian Affairs Valerie Amos

Vice President of the International Sports Press Association (AIPS) Faisal Al-Qenaei
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