Characterization of benthic habitat on northeastern Georges Bank, Canada

	Characterization of benthic habitat on northeastern Georges Bank, Canada
	Kostylev, VE; Todd, BJ; Longva, O; Valentine, PC
	2005
卷号	41
页码	141-152
英文摘要	Seafloor habitats of the Canadian part of Georges Bank were assessed and mapped following the habitat template theory (Southwood 1988). The approach considers the primary selective forces (habitat disturbance and adversity of the environment) that have shaped the existing communities of benthic species and that have defined the life history traits of species found in different habitats. The disturbance axis of the template is modeled based on the information on sediment, currents, and bathymetry. The adversity axis is modeled based on chlorophyll concentration, bottom water temperature, salinity, and seasonal variability in temperature. A preliminary sediment map needed for assessment of the natural disturbance rate was developed from high-resolution multibeam backscatter groundtruthed with archive and current sediment sample data. The distribution of megabenthos assemblages identified from underwater photography was found to follow gradients in disturbance and adversity on the bank. We suggest that application of the habitat template theory is useful for ocean managers in defining areas that are more or less likely to suffer from adverse human impacts. If natural rates of habitat disturbance are high. then risk of harmful habitat alteration and degradation is lower than in naturally stable areas. Similarly, if the natural adversity of the environment is high, then adding additional stressors will further reduce the scope for growth of organisms, which makes natural populations in adverse environments less likely to recover than populations in benign environments.
会议录	Benthic Habitats and the Effects of Fishing
会议录出版者	AMER FISHERIES SOC
会议录出版地	5410 GROSVENOR LANE, STE 110, BETHESDA, MD 20814-2199 USA
语种	英语
WOS研究方向	Fisheries ; Marine & Freshwater Biology
WOS记录号	WOS:000232152900011
内容类型	会议论文
源URL	[http://ir.fio.com.cn:8080/handle/2SI8HI0U/26420]
专题	自然资源部第一海洋研究所
通讯作者	Kostylev, VE
作者单位	Geol Survey Canada, Bedford Inst Oceanog, Dartmouth, NS B2Y 4A2, Canada
推荐引用方式 GB/T 7714	Kostylev, VE,Todd, BJ,Longva, O,et al. Characterization of benthic habitat on northeastern Georges Bank, Canada[C]. 见:.