شماره مطلب: 483

Community composition of the intertidal in relation to the shellfish aquaculture industry in coastal British Columbia, Canada

نویسنده: 
L.I. Bendell
انتشارات: 
elsevier
تعدات صفحات: 
11
The intertidal region of the Pacific Northwest is under ever increasing pressure to be used exclusively for theindustrial sized operations of shellfish aquaculture. In British Columbia (BC), aquaculture practices includeseeding the intertidal with the non-indigenous Venerupis philippinarum followed by the application of antipredatornetting. Ecological consequences of such practices applied at large scales are unknown. To assess forpossible impacts 28 farm and reference sites from 3 geographically distinct regions of BC were surveyed ineach of two years and their epibenthic, endobenthic and macroflora communities compared. The three regionsdiffered in their intensity of industry fromlow(Barkley), medium(Desolation) to high (Baynes).Marked regionaldifferences in intertidal community composition were observed. Of the three regions Baynes Sound, which has101 tenures,was themost alteredwith the greatest numbers of the invasive species, Batillaria sp. and Hemigrapsusoregonensis. Barkley Sound, the region with the lowest industrial intensity,was characterized byMytilus trossulusand the absence of H. oregonensis. The mid-intensity region, Desolation Sound, was characterized by Littorinascutulata and Tectura persona. Within Baynes Sound, seeding appears to be acting as an attractant for crabpredators with farm sites having on average 3-fold greater numbers as compared to reference sites. Farmingpractices were also found to encourage growth and biofouling of the intertidal with Ulva sp. Consequences ofchanges in community composition in this case, an increase in the abundance of a major intertidal predator,H. oregonensis, on ecosystem functioning within these sensitive coastal areas are not known.
حجم: 
1.65MB

نظرات

  • دیدگاه های ارسال شده توسط شما، پس از تایید در وب منتشر خواهد شد.
  • پیام هایی که حاوی تهمت یا افترا باشد منتشر نخواهد شد.
  • پیام هایی که به غیر از زبان فارسی یا غیر مرتبط باشد منتشر نخواهد شد.