On the Channel Islands, archaeologists draw lessons in sustainability from historic Chumash fishing practiced for centuries.
. As those animals dwindle in numbers, the fishers move down trophic levels, targeting smaller and smaller, more short-lived creatures until the ecosystem crashes, and there is nothing left to catch.
While focusing on mid-trophic fish, the Chumash community also caught seafood from across different habitats and levels of the food chain—from sardines to sharks. We say the residents were “To gauge whether Qshiwqshiw strategies sustained the ecosystem, we performed chemical analyses on several dozen recovered fish bones. The method revealed information about the food web’s foundation: photosynthetic organisms that capture the sun’s energy and convert it into edible sugars.
The same concept translates to food webs. Plant and animal communities supported by different energy sources from multiple habitats tend to be healthy and resilient. They can overcome short-term disturbances from natural climatic change or human harvest. Our research suggests that prior to Spanish arrival, the northern Channel Islands marine ecosystem was well-balanced and resilient, with nearshore, kelp forest, and offshore habitats all supporting one another.
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