Assertion: tortoise's island | /r/CapableOf | increase competition
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Source sentences:
text: Over the centuries, over-exploitation of the tortoises for meat and oil as well as introduction of non-native species to the islands (which increased competition and predation) caused a huge decline in tortoise numbers: from an estimated 250,000 individuals in the 16th century to about 3,000 in the 1970s.