I used to have arums in the garden but as far as I can remember none produced any seed. Thanks I am finding that looking for patterns has the potential to become addictive. The size and shape of the pattern (called a Turing pattern) depends on how fast the chemicals diffuse and how strongly they interact. Depending on the timing on activation and diffusion or transport, this can result in the formation of an expanding ring of activator expression (Figure 1 equal rates). Garden birds The occurrence of spotted patterns in birds is relatively common, such as in the lovely spots on the plumage of an African olive (formerly Rameron) pigeon (Columba arquatrix), this bird photographed in our garden. I suppose that as much as they need to conceal themselves from prey, they also need to conceal themselves from other predators to avoid being prey themselves! A worksheet created using . Reaction-diffusion effect: chemical interactions of pigment-forming molecules in organisms create the spots, stripes, and other visible patterns; this is also called the Turing Model. South African insects Insects South Africa South African plants The main categories of repeated patterns in nature are fractals, line patterns, meanderings, bubbles/foam, and waves. Taking its common name from the big spotted cat, this leopard magpie moth (Zerenopsis lepida) is striking in both its colour and spottedness. Weekly photo challenge The process of developing pattern formations involves two chemicals that react with each other as they diffuse through the body at a cellular level. Be prepared for some funny looks from people when you say happy easters!! I gather though that his models have their limitations so there is still plenty of mystery out there! Tessellation is a repeating pattern of the same shapes without any gaps or overlaps. The Golden Spiral (created with the Golden Ratio), a Fibonacci spiral, and a logarithmic spiral are all found in patterns in nature. Indeed. A bird of the Kalahari Desert sands, this sandgrouse I photographed early one morning in the Central Kalahari Game Reserve in Botswana. From fractals to Fibonacci, patterns in nature are everywhere. Fractals are infinitely self-similar, iterated mathematical constructs having fractal dimensions. This eagle at Mkhuze Game Reserve in KwaZulu-Natal is ruffling its feathers and looking uncharacteristically frilly, in a photo that is somewhat grainy because it was taken at quite a distance. One of the best known of our spotted bird is the helmeted guineafowl (Numida meleagris). . Thanks very much Saurab. 5 Citations. Wildlife garden South Africa, http://sitn.hms.harvard.edu/flash/2012/morphogenesis/, https://untamedscience.com/order/carnivora/, Settling in and some incidental birdwatching, On living harmoniously with vervetmonkeys. The book Patterns in Nature: . Yes, it is an especially beautiful eagle. They out-compete native species and have been shown to be more resilient/adaptable in the face of rising temperatures due to climate change. V6A 3Z7 Map . At the same time, it activates the inhibitor, which also diffuses away from the point source, inhibiting the activator. To get spots, however, we need two more layers of complexity. 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The size and shape of the pattern (called a Turing pattern) depends on how fast the chemicals diffuse and how strongly they interact. He came up with a mathematical solution that can form spots or stripes with just two chemicals. What they were witnessing was similar to computer simulations they had created using Turing's model, but with vegetation. One extreme to the next it seems. Lockdown Fascinating post, Carol, informative with excellent photos. What a fascinating post, Carol, and the photography is superb! Vancouver, BC In fact, diffusion is a well-known pattern destroyer: if you put milk in water (and don't stir), the milk will diffuseor spreadout across the cup. These patterns recur in different contexts and can sometimes be modelled mathematically.Natural patterns include symmetries, trees, spirals, meanders, waves, foams, tessellations, cracks and stripes.

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