Navigation Links
Freshwater herring had salty origin
Date:4/22/2008

East Africas Lake Tanganyika has a highly diverse fauna which closely resembles marine animals. A researcher at the University of Zurich has traced the origins of the freshwater herring of the Lake to a marine invasion which occurred in West Africa 25 to 50 million years ago, coincident with a major oceanic incursion into the region. The ancient freshwater capture of marine organisms may help to explain the origins of other species unique to this Lake. The findings are published this week in the journal PLoS ONE.

Lake Tanganyika in East Africa is the oldest of the African Great Lakes and has the highest diversity of endemic species of any lake in the region. Its unique marine-like crabs, shrimps, snails and fishes led early researchers to suggest that the Lake must have once been directly connected to the ocean. More recent geophysical reconstructions clearly show that Lake Tanganyika originated through rifting in the African continent and was never directly connected to the sea.

While the history of the Lake basin is now well understood, the origins of the highly specialized and unique fauna of Lake Tanganyika have remained a puzzle. The absence of closely-related species outside of Lake Tanganyika has made it extremely difficult to determine when the Lake was colonized and how much of its diversity arose within its borders, explains Tony Wilson. As the herring of Lake Tanganyika belong to a large group of freshwater fishes distributed throughout western and southern Africa, they offer one of the best opportunities to trace the evolutionary ancestry of members of the Lakes fauna.

The analysis of DNA data by Wilsons team allowed the construction of the evolutionary tree of African herring, which clearly shows that the herring of West Africa colonized freshwater 25 to 50 million years ago, at the time of a massive marine incursion in the region. These freshwater colonists subsequently spread across central Africa, reaching Lake Tanganyika in the early stages of its formation. Although Lake Tanganyika was never directly connected to the ocean, explains Wilson, the endemic herring of the Lake are the products of a marine invasion that occurred long ago. The extent of this marine incursion raises the possibility that other members of the endemic fauna of the Lake may also have marine origins.


'/>"/>
Contact: Prof. Tony Wilson
tony.wilson@zm.uzh.ch
41-446-354-790
Public Library of Science
Source:Eurekalert

Related biology news :

1. Conservation of freshwater fish biodiversity: a challenge for the countries of the South
2. Ecological genetics of freshwater bacteria surveyed
3. Dartmouth researchers alarmed by levels of mercury and arsenic in Chinese freshwater ecosystem
4. Canadas pristine freshwater fisheries at risk
5. Canadas pristine freshwater fisheries at risk
6. Freshwater supplies threatened in central Pacific
7. Clues to ancestral origin of placenta emerge in Stanford study
8. Researchers close in on origins of main ingredient of Alzheimers plaques
9. Technique traces origins of disease genes in mixed human populations
10. Experts prove the geochemical origin of part of the CO2 emissions in semiarid climates
11. Fungi can tell us about the origin of sex chromosomes
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:3/28/2017)... The report "Video Surveillance Market ... Storage Devices), Software (Video Analytics, VMS), and Service (VSaaS, ... to 2022", published by MarketsandMarkets, the market was valued ... to reach USD 75.64 Billion by 2022, at a ... year considered for the study is 2016 and the ...
(Date:3/24/2017)... 24, 2017 The Controller General of Immigration from ... Abdulla Algeen have received the prestigious international IAIR Award for the ... Continue Reading ... ... Controller Abdulla Algeen (small picture on the right) have received the IAIR ...
(Date:3/23/2017)... The report "Gesture Recognition and Touchless Sensing Market by Technology (Touch-based ... to 2022", published by MarketsandMarkets, the market is expected to be worth USD ... 2022. Continue Reading ... ... ...
Breaking Biology News(10 mins):
(Date:9/17/2017)... ... 17, 2017 , ... GeneOne Life Science, Inc. announces that ... Safety (KMFDS) for an Investigational New Drug application for a Phase I/IIa study ... The study in Korea represents the second clinical trial for GLS-5300. , ...
(Date:9/14/2017)... ... September 14, 2017 , ... DrugDev ... biotech at the third annual DrugDev Summit, November 7-8, 2017 in Philadelphia, PA. ... most progressive clinical research leaders for best practice case studies, keynote presentations, lively ...
(Date:9/14/2017)... ... September 14, 2017 , ... AxioMed is pleased to ... Dr. Steven Yang completed the procedure on a 35-year-old female patient suffering from ... disc at level L5-S1. The patient failed conservative treatments prior to undergoing surgery. ...
(Date:9/14/2017)... ... September 14, 2017 , ... Cambridge Semantics , the ... that its Anzo Smart Data Lake has been named a KMWorld Trend-Setting ... that help organizations succeed in surpassing their knowledge management goals. KMWorld searches for ...
Breaking Biology Technology: