It turns out trickle-down economics don鈥檛 work any better for people than for fish. While the communities that surround coral reefs get richer, the fish lose out.

A study by the 菊花视频 (WCS) and other organizations found that the health of coral reef fish is directly linked to local economies. The researchers examined reef systems, human population densities, and socio-economics along Africa鈥檚 Indian Ocean coast, and drew a surprising correlation between the region鈥檚 middle class communities and low fish levels. Curiously, the fish in both the poorer and the wealthier areas fared better.

鈥淭his is a significant finding on how socio-economics can influence reef fisheries in surprising ways,鈥� said Dr. Tim McClanahan, WCS coral researcher. 鈥淚t also shows the importance of combining ecology with social science for conservation planning on a regional scale.鈥�

The explanation lies in the interplay between traditional customs and economic growth. In poor communities, many of which rely heavily on marine resources, fishermen use traditional, low-tech fishing methods. When a community becomes wealthier, it tends to use more motorized fishing vessels and fishing gear such as handlines, even if it relies less on fishing for subsistence. The more sophisticated fishing techniques tend to be much more destructive on marine environments. Economic growth during the early stages can also erode a community鈥檚 cultural restrictions on overfishing. Among the countries studied, Kenya, in particular, has experienced a sharp decline in cultural restraints that had kept fishing levels in check.

The most affluent communities, by contrast, are less dependent on marine resources, with more salaried positions and diverse economic opportunities. Wealthier communities possess higher levels of technology鈥攍arger boats that enable fishermen to fish on the open sea鈥攁nd are more aware of the importance of coral reefs on ecological health.

Predictably, the research also found that high human population density had a consistently negative鈥攖hough not strong鈥攅ffect on fish levels. And protected marine sites with no fishing had three times more fish than sites where fishing was permitted.

McClanahan emphasized that coral reef fishery management depends not just on fishing laws but also in part on a community鈥檚 access to wider economic opportunities, as well as infrastructure developments like schools and hospitals. 菊花视频, donors, and other agencies can help communities invest in these programs and livelihoods, he said.