– A dramatically changing climate is going to have a lot of negative side effects we didn’t predict, and scientists have just found a new one: really cranky spiders.
"As sea levels rise, the incidence of tropical storms will only increase. Now more than ever we need to contend with what the ecological and evolutionary impacts of these storms will be for non-human animals." But they’re not all happy little spiders peacefully sharing the same space. The species displays two distinct behavioural phenotypes. Some of the spiders are more tolerant and relatively placid, while others are more aggressive. These can live side-by-side in the same colony; the more aggressive spiders in the colony, the more aggressive overall the colony is.
To determine the effect these storms were having on spider aggression, the researchers waited until a storm’s landfall path was predicted, then sampled spider colonies in that location. Then they returned to the site within 48 hours of the storm’s passing, and sampled the colonies again. "Tropical cyclones selected for more aggressive colony phenotypes. Following tropical cyclones, colonies with more aggressive foraging responses produced more egg cases and had more spiderlings survive into early winter, whereas the opposite trend emerged in control sites," the researchers wrote.
پاکستان تازہ ترین خبریں, پاکستان عنوانات
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