Rob Wilson, an entomologist, has returned to his butterfly monitoring routine in Colmenar Viejo, Madrid. Over the past eight years, he and colleague Juan Pablo Cancela have noticed a concerning decline in butterfly species, reflecting a broader global trend. Their method involves taking regular walks along a set transect, documenting butterfly occurrences within a defined area. Despite the lack of long-term data validity, their observations indicate that once-abundant species are becoming increasingly rare, raising alarms about biodiversity loss that requires urgent attention from the scientific community.
Rob Wilson has resumed a routine in search of butterflies, observing a decline in lepidopteran numbers, indicative of a global trend affecting butterfly populations.
The data collected over eight years shows that species once common are becoming rare, highlighting the urgent need for long-term monitoring of biodiversity.
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