Download PDF by Gene S. Helfman: Fish Conservation: A Guide to Understanding and Restoring

By Gene S. Helfman

ISBN-10: 1559635959

ISBN-13: 9781559635950

ISBN-10: 1559635967

ISBN-13: 9781559635967

Fish Conservation deals, for the 1st time in one quantity, a readable reference with a world method of marine and freshwater fish variety and fishery source matters. Gene Helfman brings jointly to be had wisdom at the decline and recovery of freshwater and marine fishes, delivering ecologically sound solutions to biodiversity declines in addition to to fishery administration difficulties on the subsistence, leisure, and advertisement degrees. Written in an interesting and obtainable variety, the book:considers the price of keeping aquatic biodiversityoffers an summary of imperiled fishes on a taxonomic and geographic basispresents a synthesis of universal features of imperiled fishes and their habitatsdetails anthropogenic motives of declineexamines human exploitation issuesaddresses moral questions surrounding exploitation of fishesThe ultimate bankruptcy integrates issues and evaluates clients for arresting declines, emphasizing the appliance of evolutionary and ecological rules in gentle of projected tendencies. all through, Helfman presents examples, explores case experiences, and synthesizes on hand info from a vast taxonomic, habitat, and geographic range. Fish Conservation summarizes the present nation of information in regards to the degradation and recovery of variety between fishes and the productiveness of fishery assets, declaring parts the place development has been made and the place extra should be performed. suggestions specialise in the applying of ecological wisdom to fixing sensible difficulties, spotting that potent biodiversity conservation is determined by assembly human wishes via administration that specializes in long-term sustainability and an atmosphere viewpoint. (20071201)

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An ESU is not only isolated from other groups but also “represents an important component of the evolutionary legacy of the species” (Waples 1995, p. 9). Current genetic variability represents the reservoir on which future evolutionary potential depends and on which selection will operate. The variety of genes in today’s populations will determine whether a species will be able to adjust to future conditions. To do this, we have to protect populations that are genetically distinct, that have a unique genetic make-up.

The last specimen was taken in 1893, but the fish was not declared extinct until the 1940s, in hopes that a population existed somewhere. Harelip suckers probably suffered because they were habitat and trophic specialists, occupying deep, rocky pools in medium and large, upland, warm, clear streams, where they fed on small mollusks, predominantly snails. The harelip sucker may have been “the only true mollusk specialist in the family” (Jenkins and Burkhead 1994, p. 461). We know remarkably little about this once widespread fish.

From R. R. Miller et al. (1989); used with permission of the artist and AFS. australis as Vulnerable and M. lapicida as Data Deficient (Campos et al. 1998), a rank it also held in IUCN (2004). In North America, several lamprey species have national conservation status. Three were listed as Vulnerable in Canada (R. R. S. (J. E. Williams et al. S. had the seeming distinction of causing the only “known” lamprey extinction. The Miller Lake lamprey, L. 1), the world’s smallest parasitic lamprey, was poisoned into apparent extinction in 1958 because it parasitized introduced trout at its only known locale, Miller Lake, Oregon (Bond and Kan 1973; R.

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Fish Conservation: A Guide to Understanding and Restoring Global Aquatic Biodiversity and Fishery Resources by Gene S. Helfman


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