Menu

Image of the Day: Black-Eyed Rage

When defensive, guppies display a warning sign to their counterparts. 

Jun 6, 2018
Sukanya Charuchandra

A black-eyed guppy (Poecilia reticulata) defends a morsel of food from its calmer, silver-eyed counterpart. ROBERT HEATHCOTE UNIVERSITY OF EXETERIn a study published on June 4 in Current Biology, researchers report that Trinidadian guppies (Poecilia reticulata) swiftly alter their iris color from silver to black when behaving aggressively towards smaller guppies. “You’ll see these little angry fish swimming over food patches, attacking anything coming over them,” Robert Heathcote, a coauthor on the paper, tells The Atlantic

Black- and silver-eyed guppies (Poecilia reticulata) feed on a food patch. ROBERT HEATHCOTE UNIVERSITY OF EXETER

Heathcote’s team conducted behavioral trials using smaller, guppy-like robots with black or silver irises to see how larger guppies would respond to the eye color. The researchers found that when guarding food, the black-eyed, smaller imposters attracted larger, blacker-eyed competitors. The researchers believe the fish show their “honest” hostility only if they can be dominant over the smaller variants.

R.J.P. Heathcote et al., “Dynamic eye colour as an honest signal of aggression,” Curr Biol, doi:10.1016/j.cub.2018.04.078, 2018.

September 2018

The Muscle Issue

The dynamic tissue reveals its secrets

Marketplace

Sponsored Product Updates

Horizon Discovery introduces Myeloid DNA Reference Standard to support genetic testing of leukemia

Horizon Discovery introduces Myeloid DNA Reference Standard to support genetic testing of leukemia

Horizon Discovery Group plc, a global leader in gene editing and gene modulation technologies, today announced the launch of its Myeloid DNA Reference Standard. The first-to-market large cell-line derived myeloid cancer reference standard designed enables faster, more reliable and more cost-effective assay validation, to support the market in bringing routine testing into practice.

StemExpress LeukopakâNow Available in Frozen Format

StemExpress LeukopakâNow Available in Frozen Format

StemExpress, a Folsom, California based leading supplier of human biospecimens, announces the release of frozen Peripheral Blood Leukopaks. Leukopaks provide an enriched source of peripheral blood mononuclear cells (PBMCs) with low granulocyte and red blood cells that can be used in a variety of downstream cell-based applications.

New Antifade Mounting Media from Vector Laboratories Enhances Immunofluorescence Applications

New Antifade Mounting Media from Vector Laboratories Enhances Immunofluorescence Applications

Vector Laboratories, a leader in the development and manufacture of labeling and detection reagents for biomedical research, introduces VECTASHIELD® Vibrance™ – antifade mounting media that delivers significant improvements to the immunofluorescence workflow.

Best Practices for Sample Preparation and Lipid Extraction from Various Samples

Best Practices for Sample Preparation and Lipid Extraction from Various Samples

Download this white paper from Bertin Technologies to learn how to extract and analyze lipid samples from various models!