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Female fish can breed new species if males are attractive enough
"Our research shows that hybridisation can fuel the evolution of new species which is a very novel finding." - Dr Joana Meier.

Forty new species found in single lake

New research from St John’s College, University of Cambridge has found that fish will mate with males from different species if its colouring is attractive enough, or if the female can’t see it’s mate properly. This can lead to the evolution of a new species.

A group of scientists visited two freshwater lakes in East Africa, studying 2,000 fish and analysing the DNA of more than 400 cichlid fish over ten years. The group discovered more than 40 new, ecologically diverse species – called radiations – in Lake Mweru, which was formed roughly one million years ago.

Evolutionary biologist and lead author of the research Dr Joana Meier said: “The new species of cichlids adapted to use all the available food resources in the lake. Some feed on insect larvae, others zooplankton or algae. Some newly discovered fish are predators with large teeth, which we named ‘large-tooth serranchromines’.”

Through conducting mating ritual tests in a lab, the team discovered that female cichlids would choose males from a different species to mate with if their colouring was similar to that of the female’s own species. They also found that females could not distinguish between males of their own species or other species when lighting was poor, as they could not see their colours clearly.

Scientists determined that this is what happened a million years ago when different species of cichlids from the Congo and the Zambezi combined in Lake Mweru. Creating a diverse offspring that could feed on different things to their parents and invade new habitats. Eventually leading to the evolution of 40 new species of fish.

Dr Meier continued: “Hybridisation has traditionally been viewed as something bad because if species hybridise they can, over time, merge into a single species and you lose biodiversity or lose the local species.

“The melting pot of Lake Mweru gave us a rare opportunity to study interactions between evolving new species and showed that in a new environment with lots of ecological opportunity hybridisation can be a good thing that actually increases biodiversity.”

Image (c) Dr Joana Meier

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Webinar to focus on equine worm control

News Story 1
 Vets, veterinary nurses and RAMAs are being invited to join a free CPD webinar on late winter and early spring equine worm control.

Hosted by Zoetis vet Dr Wendy Talbot, the webinar aims to help prescribers understand which parasites are of most concern at this time of year. It will also cover how to assess parasite risk, selecting a suitable wormer and spring wormer plans, concluding with a Q&A session.

The webinar takes place on Thursday, 18 March at 10 am and will be repeated at 7 pm for those unable to listen during the day. To book the 10 am webinar, click here, and to register for the 7 pm webinar, click here

Click here for more...
News Shorts
Avian influenza confirmed in Lancashire

A case of highly pathogenic (HPAI H5N8) avian influenza has been confirmed in two captive peregrine falcons on a non-commercial, non-poultry premises near Skelmersdale, West Lancashire.

Following a risk assessment, APHA has declared that no disease control zones have been put in place surrounding this non-commercial, non-poultry premises.

Eighteen cases of HPAI H5N8 have now been identified in poultry and other captive birds in England. A housing order for poultry and captive birds introduced by Defra to control the spread of the disease expired on 31 March, although bird keepers in England are still required by law to comply with biosecurity measures.

For more information, please click here.