Hurricanes drive evolution of more aggressive spiders: Study

Washington D.C. [USA], Aug 26 (ANI): Extreme weather events such as tropical cyclones may have an evolutionary impact on spider's population, claims researchers who have studied their behaviour.
Raging winds can demolish trees, defoliate entire canopies and scatter debris across forest floors, radically altering the habitats and reshaping the selective pressures on many organisms, says the study published in the journal -- Nature Ecology & Evolution.
"It is tremendously important to understand the environmental impacts of these 'black swan' weather events on evolution and natural selection," said lead author Jonathan Pruitt, evolutionary biologist and Canada 150 Chair in McMaster's Department of Psychology, Neuroscience, and Behaviour.
"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," he said.
Pruitt and his team examined female colonies of the spider known as Anelosimus studiosus, which lives along the Gulf and Atlantic coasts of the United States and Mexico, directly in the path of tropical cyclones that form in the Atlantic basin from May to November.
To conduct the research, scientists had to tackle many logistical and methodological challenges which included anticipating the trajectory of the tropical cyclones. Once a storm's path was determined, they sampled populations before landfall, and then returned to the sites within 48 hours.
They sampled 240 colonies throughout the storm-prone coastal regions, and compared them to control sites, with a particular interest in determining if extreme weather -- in this case area disturbed in 2018 by subtropical storm Alberto, Hurricane Florence, and Hurricane Michael -- caused particular spider traits to prevail over others.
Aggressive colonies, for example, are better at acquiring resources when scarce but are also more prone to infighting when deprived of food for long periods of time or when colonies become overheated.
"Tropical cyclones likely impact both of these stressors by altering the numbers of flying prey and increasing sun exposure from a more open canopy layer. Aggressiveness is passed down through generations in these colonies, from parent to daughter, and is a major factor in their survival and ability to reproduce," explains Pruitt.
The analysis suggested that after a tropical cyclone event, colonies with more aggressive foraging responses produced more egg cases and had more spiderlings survive into early winter.
"The trend was consistent across multiple storms that varied in size, duration, and intensity, suggesting the effects are robust evolutionary responses," said Pruitt. (ANI)