LME:LEARN - Large Marine Ecosystems

Fishing through Marine Food Webs (2006)

A recurring pattern of declining mean trophic level of fisheries landings, termed "fishing down the food web," is thought to be indicative of the serial replacement of high-trophic-level fisheries with less valuable, low-trophic-level fisheries as the former be- come depleted to economic extinction. An alternative to this view, that declining mean trophic levels indicate the serial addition of low-trophic-level fisheries ("fishing through the food web"), may be equally severe because it ultimately leads to conflicting de- mands for ecosystem services. By analyzing trends in fishery landings in 48 large marine ecosystems worldwide, we find that fishing down the food web was pervasive (present in 30 ecosys- tems) but that the sequential addition mechanism was by far the most common one underlying declines in the mean trophic level of landings.

11 Sep 2017 by eve

1.4 MB

Fishing through Marine Food Webs (2006) .pdf