Download 5 Easy Pieces: The Impact of Fisheries on Marine Ecosystems by Daniel Pauly PDF

By Daniel Pauly

5 Easy items positive factors 5 contributions, initially released in Nature and technology, demonstrating the big affects of contemporary business fisheries on marine ecosystems. at first released over an eight-year interval, from 1995 to 2003, those articles illustrate a transition in medical thought—from the initially-contested attention that the situation of fisheries and their underlying ocean ecosystems was once, in reality, international to its extensive popularity via mainstream medical and public opinion. Daniel Pauly, a widely known fisheries specialist who used to be a co-author of all 5 articles, provides every one unique article right here and surrounds it with a wealthy array of up to date reviews, a lot of which led Pauly and his colleagues to additional examine. furthermore, Pauly files how well known media pronounced at the articles and their findings. through doing so, he demonstrates how technological know-how evolves. in a single bankruptcy, for instance, the preferred media decide up a contribution and use Pauly’s conclusions to contextualize present political disputes; in one other, what could be noticeable as nitpicking via fellow scientists leads Pauly and his colleagues to bolster their case that advertisement fishing is endangering the worldwide marine surroundings. This constitution additionally permits readers to determine how scientists’ interactions with the preferred media can form the reception in their personal, occasionally debatable, medical studies. In an epilog, Pauly displays at the ways in which medical consensus emerges from discussions either inside and outdoors the medical group.

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Additional info for 5 Easy Pieces: The Impact of Fisheries on Marine Ecosystems (State of the World's Oceans)

Example text

G. Laborte, to link these time series with the trophic level estimates that Francisco Torres Jr. had assigned to each of the 1200+ taxa in the FAO statistics, based on 200+ independent trophic level estimates from Ecopath. This yielded a routine that called on the global FAO data set (incorporated into FishBase) to compute, at the press of a button, country- and region-specific time series of mean trophic level, of primary production required, and of other ecosystem status indicators (see section on FAO Statistics, p.

Moreover, the increase of young fish as a proportion of landings in a given species that result from increasing fishing pressure would strengthen the reported trends, because the young of piscivorous species tend to be zooplanktivorous (Robb and Hislop 1980; Longhurst and Pauly 1987) and thus have lower trophic levels than the adults. Items (ii) and (iii) may be more important for the overall explanation. Thus, for the Northeast Atlantic, the estimated (Alverson et al. 6B. We refer here to gill rakers, whose spacing determines the size of organisms that may be filtered, the length of the alimentary canal, which determines what may be digested, or the caudal fin aspect ratio, which determines attack speed, and hence, which prey organism may be consumed.

Nitrogen tends to be conserved in marine systems and has transfer efficiency of up to 28%. Second, transfer efficiency remains constant along the food chain. This would be really surprising considering the amount of effort higher trophic levels have to invest to find and catch food. Third, transfer efficiency is independent of length of the food chain. However, a general pattern of decrease in mean transfer efficiency with increase in the number of trophic levels has been established (Ryther 1969).

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