User Tools

    To create and edit articles, please register and log-in

Main Menu : categories & index etc.

Main menu
Click categories to expand


A-Z listingplugin-autotooltip__plain plugin-autotooltip_bigA-Z listing

This is an alphabetical index of all content pages.


Other categories

Utilities

Contact
Register
Sandbox

Also see

Importance Ratings
News
Legal
Donate/Sponsor
Curator's rationale
AI Policy



Twitter feed đť•Ź



Feeds + s.e.o. etc.
rss / xml feed
sitemap file
A-Z listing (archived)


Indexed under : Life Sciences / Zoology

Wikenigma - an Encyclopedia of Unknowns Wikenigma - an Encyclopedia of the Unknown

Tropical colourfulness

As far back as the 19th century, biologists pointed out an apparent anomaly in the extra 'colourfulness' of birds and insects in tropical regions.

The reasons for the differences remain unproven, but Alfred Wallace and others suggested that they might be due to the “luxuriant vegetation of the tropics” which acted as a natural camouflage all year round, whereas organisms in the North and South had to adapt their plumage to match the bare trees in winter.

It was also suggested that tropical birds and insects might have more freely available energy to be able to 'indulge' in extra colourfull plumage.

A study published in Nature Ecology & Evolution, April 2022 examined more than 4,500 species, and suggests that previous theories might well have some merit.

We show that male and female birds of tropical passerine species are generally more colourful than their temperate counterparts, both on average and in the extreme. We also show that these geographic gradients can be explained in part by the effects of several latitude-related factors related to classic hypotheses for climatic and ecological determinants of organismal colourfulness.“

See : Latitudinal gradients in avian colourfulness

It should be noted, however, that previous studies have suggested that the entire supposition is not scientifically sound.

See : Birds, butterflies and flowers in the tropics are not more colourful than those at higher latitudes, Global Ecology and Biogeography, Volume 24, Issue 12 (sample : 570 species)


    Please share this page to help promote Wikenigma !

Dear reader : Do you have any suggestions for the site's content?

Ideas for new topics, and suggested additions / corrections for older ones, are always welcome.

If you have skills or interests in a particular field, and have suggestions for Wikenigma, get in touch !


Or, if you'd like to become a regular contributor . . . request a login password. Registered users can edit the entire content of the site, and also create new pages.

( The 'Notes for contributors' section in the main menu has further information and guidelines etc.)

Automatic Translation

You are currently viewing an auto-translated version of Wikenigma

Please be aware that no automatic translation engines are 100% accurate, and so the auto-translated content will very probably feature errors and omissions.

Nevertheless, Wikenigma hopes that the translated content will help to attract a wider global audience.

Show another (random) article

Further resources :

DOKUWIKI IMPLEMENTATION DESIGN BY UNIV.ORG.UK DECEMBER 2023