Fish often spawn eggs with ovarian fluids that have been hypothesized to support the sperm of some males over others (cryptic female choice). Alternatively, sperm reactions to ovarian fluids could reveal male strategies. We used wild-caught lake char (Salvelinus umbla) to experimentally test whether sperm react differently to the presence of ovarian fluid, and whether any differential sperm reaction could be predicted by male breeding coloration, male inbreeding coefficients (based of 4150 SNPs) or the kinship coefficients between males and females. Male coloration was positively linked to body size and current health (based on lymphocytosis and thrombocytosis) but was a poor predictor of inbreeding or kinship coefficients. We found that sperm of more colourful males were faster in diluted ovarian fluids than in water only, while sperm of paler males were faster in water than in ovarian fluids. We then let equal numbers of sperm compete for fertilizations in the presence or absence of ovarian fluids and genetically assigned 1464 embryos (from 70 experimental trials) to their fathers. The presence of ovarian fluids significantly increased the success of the more colourful competitors. Sperm of less inbred competitors were more successful when tested in water only than in diluted ovarian fluids. The kinship coefficients had no significant effects on sperm traits or fertilization success in the presence of ovarian fluids, although parallel stress tests on embryos had revealed that females would profit more from mating with least related males rather than most coloured ones. We conclude that sperm of more colourful males are best adapted to ovarian fluids, and that the observed reaction norms suggest male strategies rather than cryptic female choice.

You've most likely seen a photo of the vibrant Nyhavn in Copenhagen. But did you know that we have colourful spots dotted all over the city? Here are nine of our capital's brightest streets, ready to make your instagram pop!


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This is an oldie, but a goodie! And we mean oldie in the most literal sense, because Magstrde and its neighbouring street Snaregade are two of the oldest (and most colourful) streets in Copenhagen - they date back to the 16th century. But they get even prettier as time goes by.

If you ask any local about where the most colourful street is in the neighbourhood of sterbro, they will most definitely point you in the direction of Olufsvej. This cosy little side street is sandwiched between the city's biggest park, Flledparken, and the neighbourhood's main shopping street, sterbrogade. So you'll have plenty of opportunity to fill your bags, or go for stroll in the park - and if you have a sweet tooth you should pop by the ice-cream shop Olufs at the end of the street.

A walk around Christianshavn is surely not to be missed. This neighbourhood has a history as colourful as its buildings. And it's on an understatement to say that you'll want to snap a photo on practically every corner, because this area is always camera ready.

As you walk around the cobbled stone streets and along the canals packed with crooked colourful houses that'll brighten up any grey day, you should make a stop in Sofiegade which has a house so eye-catching that it'd make even Wes Anderson jealous.

Just off the main shopping streets in the city centre, you'll find the little square Grbrdretorv. This quiet oasis is surrounded by bright yellow, orange and red houses that create a warm atmosphere for those enjoying a meal at one of the cosy cafes. Classic colourful houses of Copenhagen.

Let us introduce you to the newest colourful housing district, Urban Rigger. It's a futuristic housing community that floats (yes floats!) in the harbour by the hip Refshaleen. And you can't miss spotting the blue and green colours of Urban Rigger while you're snacking your way through the mouth-watering stalls at Reffen street food market.

Natural dyes have a rich, long and colourful history. However, as European imperial powers colonised the world, the natural resources of other countries were plundered to meet the European appetite for coloured fabrics.

This iconic colourful Jute Twine Spool from the Nutscene Heritage Range are still produced in our factory in the County of Angus, Scotland, on our original winding machines which were introduced circa 1922.

Nutscene' s iconic Heritage twines offers a range of 21 colours for all your project's needs. Whether you use it in the garden, in the kitchen, classroom or craft room, Nutscene remains the original and best producer of quality colourful jute twines. Colours will fade in strong sunlight.

Today is Marted Grasso (Mardi Gras) and this year I wanted to prepare a super colourful meal for my kids. Creating something that can appeal to an 11-year-old and a 1-year-old at the same time left no doubt, colourful pasta!

Humans cannot see ultraviolet light, but many arthropods and vertebrates can because they have a single photo-receptor with a peak sensitivity to light at wavelengths of around 350 nanometres (ref. 1). Here we use electrophysiological methods to investigate the vision of the mantis shrimp, Neogonodactylus oerstedii. We find that this marine crustacean has at least four types of photoreceptor for ultraviolet light that are located in cells of the eye known as R8 cells. These photoreceptors are maximally sensitive to light of wavelengths 315, 330, 340 and 380 nm. Together with previous evidence2, this finding indicates that the remarkable colour-vision system in these stomatopod crustaceans may be unique, as befits their habitat of kaleidoscopically colourful tropical coral reefs.

A colourful number is one that includes no duplicates in the list of it digits + the products of the subsets of its digits. For example, the products of 263 are [2, 6, 3, 2x6, 6x3, 2x6x3]. These are all different numbers, so 263 is colourful.

Colorful is predominantly used in ?? American (US) English (en-US) while colourful is predominantly used in ?? British English (used in UK/AU/NZ) (en-GB).

Known mostly as Ankara, the origins of the colourful fabric that has come to embody the very essence of African-ness on the continent, and for diasporans looking to stay connected to their roots, is not African itself.

To test these hypotheses, we collected information on the environmental and ecological characteristics of the species in our study, and used data analysis to find out with variables could help explain the variation in colourfulness across species. 006ab0faaa

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