Tag: "cichlid" at biology news
Biocontrol of invasive water hyacinth contributes to socioeconomic and health improvements in Africa
...ory of evolutionary biology because of its diverse cichlid
fish populations, and it has provided livelihoods for humans for many thousands of years. With no natural enemies in Africa, the water hyacinth proliferated around Lake Victoria and resulted in reduced fish catches and biodiversity. It interfere...
Newly discovered fish named after New York aquarium biologist
... History (AMNH), after they named a new species of cichlid
Ptychochromis loisellei. The announcement was mad...else on earth. The newly described black and gold cichlid
is about five inches long, and known locally as a "garaka." It occurs in several river system in th...
Fish can determine their social rank by observation alone, study finds
...ory fish called Astatotilapia burtoni, one of many cichlid
species that inhabit Lake Tanganyika in eastern Africa. A. burtoni males are extremely territorial and regularly engage in aggressive fights, the outcome of which determines who gets access to food and mates. "Males that repeatedly lose fights are...
Researchers look to nature for design inspiration
...man is looking at the jaws of different species of cichlid
fish to better understand the mechanical properties of jaws and teeth under stress. Some species of cichlids crush hard prey, like snails, while others do not. Streelman's team is generating three-dimensional X-rays of the jaws to allow them to compa...
Choosy females make colourful males
...ly to share the same preferences. In Lake Victoria cichlid
fish, Martine Maan found a solution for this parad...cy in Lake Victoria is declining. In turbid water, cichlid
females are less choosy and males are less brightly coloured. This research therefore underlines the...
African amphibians make extreme parental sacrifice: The skin off their backs
... and a curator in the U-M Museum of Zoology. "Some cichlid
fishes are known to provide their hatchlings with nutrition through skin secretions, but this does not include skin feeding." Earlier observations of another species in the same order of amphibians foreshadowed the latest discovery. In the 1990s, the...
New study shows animal family tree looking bushy in places
...ons include, Darwin's finches in the Galapagos and cichlid
fish in African lakes. In that respect, the results of the new study support paleontological evidence of an explosive radiation at the dawn of animal life. To arrive at a definitive tree of life for animals, Carroll and Rokas believe, will require ...
Changes to embryos can elicit change in adult fish
... simple biomechanical system, the lower jaw of the cichlid
fish. In addition, they've shown that increasing e...system," said Streelman. Researchers compared two cichlid
species that dwell in Africa's Lake Malawi. One species had force modified jaws that are more adept ...
Forsyth scientists identify a gene responsible for facial diversity
...scovered that the genes that influence the jaws of cichlid
fish, tropical freshwater fish renowned for head s... biological therapies for facial traumas." African cichlid
fishes have evolved highly specialized modes of feeding through extensive adaptations of their jaws....
Sudden change in social status triggers genetic response in male fish, study finds
... But now scientists studying a species of African cichlid
fish have discovered that low-ranking male cichlid...tting up a fight. In fact, a drab subordinate male cichlid
will begin physically transforming into a colorful dominant male as soon as he notices that his comp...
Rapid genomic and physiological responses for social dominance
... Russell Fernald demonstrate that subordinate male cichlid
fish become dominant within minutes of an opportunity to do so, rapidly developing the bright coloration of dominant males and indulging in dominant behaviors. The authors simulated natural social upheavals by removing the dominant male an hour befo...
Research: removal of dominant rivals causes male cichlid fish to undergo remarkable transformation
CHAPEL HILL -- In a new study of cichlid
fish descended from others caught in East Africa's...ominant males were removed. "When we took dominant cichlid
males from an experimental tank, subordinate males started becoming dominant themselves in as few as...
Multiple genes permit closely related fish species to mix and match their color vision
...Malawi, it has been estimated that hundreds of new cichlid
species have arisen in these lakes in the last 100...olor vision could greatly influence and even drive cichlid
speciation. In the new work, the researchers performed physiological and molecular genetic analyses ...
Helping in a selfish world
...iver have been studying a small species of African cichlid
fish that live in groups with a dominant breeding pair and non-breeding helpers. All individuals (helpers and breeders) co-operate to defend the young and the territory. The researchers combined behavioural observations with genetic analyses of relat...
Cricket's finicky mating behavior boosts biodiversity
... animals, say Mendelson and Shaw, only the African cichlid
fish spawns new species more quickly. While early biologists based their estimates of speciation rates on morphological, or structural characteristics, Mendelson says, scientists today are more likely to use genetic data to come up with estimates. Cl...
Study in Royal Society journal on managing GM crops for environmental benefit
...United States Helpers in a cooperatively breeding cichlid
stay and pay or disperse and breed, depending on e...e found that helpers in the cooperatively breeding cichlid
Neolamprologus pulcher reduced help when independent breeding was possible. Mainly large helpers lef...
Studies in Royal Society journals include stress in birds and depletion of medieval fish stocks
...ation trait, male coloration, in the Lake Victoria cichlid
Pundamilia nyererei by Dr ME Maan, Dr O Seehausen,...aylor In Lake Victoria (East-Africa), hundreds of cichlid
species have evolved rapidly. Mainly males are very colourful, and choosy females use these colours ...
Study in Royal Society journals presents evidence for inherited factors in homosexuality
...r IM Hamilton Subordinates of the Lake Tanganyika cichlid
Neolamprologus pulcher help raise the young of dominant breeders. However, these helpers live under the ever-present danger of being evicted from the group, particularly when helpers and breeders are of similar size. We show in a controlled laborator...