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Cabbage White butterflies form two to six generations a year, depending on the climate. In warmer regions there are more generations. Climate change has effects on the number of generations a year. A generation are all four stages from egg to butterfly. The eggs are usually on the underside of the leaf, in small groups, so the Cabbage White butterfly needs large, strong Brassicae plants, because these plants are not so common inland, they might appear on cultivated cabbage plant species… The big and the small Cabbage White butterflies are difficult to distinguish, especially in photos, because a centimeter ruler would have to be photographed; at the upper side of the wings, the apex blackening – the black tip - is more expanded in the large Cabbage White butterfly. - that's the only way to tell the difference between small and large Cabbage White butterflies on photos. On close-ups it is even harder to tell them apart. In ecology from a bird's point of view. The insects are there to be bird feed. For a stable population you only need one male and one female butterfly from one species to breed again. Most insects use a strategy of over-reproduction. The population dynamics can get out of balance, that is why we need a diversity of insects. Ecology has a balance. The birds need insects to raise their young, the butterfly chrysalis are also eaten. If insects are gone there will be no more birds or bats. You could say we could sacrifice the outer leaves of our cabbage for songbirds instead of injecting poison, and therefore also poisoning ourselves. The most important thing ecologically: Einstein is said to have said that if the bees die out, we humans will also die out after 5 years – that might not be exactly true - but the logic behind it is right - the bee is the flagship symbol, so to speak. The Cabbage White butterfly is a strong pollinator, it visits many flowers and has a proboscis with which it drinks nectar. The adult Cabbage White butterflies like to suck on various plants such as lavender blossoms, thyme, thistles. Butterflies in captivity often do not mate because they need the arousal curve - flying around, courtship behavior, the "dance" of Cabbage White butterflies is well known to gardeners. The primary habitat of the Large Cabbage White butterfly is along the coastal regions of the North Baltic Sea - because there is a lot of space on the beaches but little competition among the plants and there is the so-called sea mustard which belongs to the cabbage relatives (Brassicae), this is the original forage plant of Cabbage White butterflies, there you can see the sandy beach that is flooded during storm surges - the plant is also salt-tolerant; the plants there are large and the groups of Cabbage White butterfly caterpillars can thrive. The Cabbage White butterfly has multiple migration strategies - not every generation migrates - but it might be of evolutionary advantage to do so. Why we shouldn’t eradicate the Cabbage White butterfly? There is the argument of the gene flow - germ line - that evolution, has developed, over millions of years, every living being that disappears is a huge loss. The preservation of pest species is also an end in itself because we never know whether properties that have evolved evolutionary in this way are useful in the future. Insects might show us new compounds in pharmacy and biochemistry. First, butterflies are important recyclers and pollinators, second to preserve a species has ethical implications, third the have huge ecological importance. Insect die-off is mainly caused by agricultural monocultures. Butterflies and moths (Lepidoptera) are also enormously successful. One in every ten animals on Earth is a butterfly or moth. Points against insect extinction: -fallow land that functions as flowering meadows and is only mowed 1-2 times a year -Fewer people through education but better social structures and better lives for all humans -greening of agriculture, away from spraying poison, multi-field farming - restrict fertilizers, other seeds that are more robust and less productive but healthier -Away from the homogenization of the landscape, let your own garden be more of a garden, more flowering plants, stinging nettles in a corner, wild corners -niches for insects also in the city, balconies and parks with flowering plants with nectar -nature reserves are not enough because the genetic diversity collapses if there is not enough space Change laws that make the country liable if something is not mowed, because speed limits would make much more sense, - - roads and roadsides are important habitats for insects. Bionics: construction principles that humans would not have thought of might be discovered in insects.