00000nam 2200000zi 4500 9.877731 CaOODSP 20221107165042 m o d f cr cn||||||||| 190809t20202020oncab ob f000 0 eng d 9780660321585 CaOODSP eng rda CaOODSP eng eng fre n-cn-bc x7y1 Fs97-6/3330E-PDF Hansen, Sandra, author. Identifying variables for standardization of the Northern Abalone (Haliotis kamtschatkana) Index Site Surveys time series (1978-2018) based on survey methodology and environmental variability / by Sandra C. Hansen, Shannon G. Obradovich, Christopher N. Rooper, Brenda J. Waddell, Linda M. Nichol, Shaun K. MacNeill, and Leslie L. Barton. [Ottawa] : Fisheries and Oceans Canada = Pêches et océans Canada, 2020. ©2020 1 online resource (vii, 110 pages) : illustrations (some colour), colour map. text txt rdacontent computer c rdamedia online resource cr rdacarrier Canadian technical report of fisheries and aquatic sciences, 1488-5379 ; 3330 Includes bibliographical references (pages 28-34). "The Northern Abalone (Haliotis kamtschatkana) is a culturally and ecologically significant endangered marine snail. This report examines forty years of data from the Northern Abalone Index Site Surveys in British Columbia. Northern Abalone densities were generally insensitive to changes in the number of surveyed index sites and quadrats. There was high imprecision around the mean estimates in both the full and restricted datasets. Inclusion of environmental variables identified with generalized additive modelling in a standardized index yielded small improvements in precision of the annual indices. Trend detection using the existing survey data is limited by the large confidence intervals around the mean densities. Recommendations are to include the full dataset in further analyses, to use a subset of environmental variables to standardize the time series, and to increase the number of index sites surveyed in future Northern Abalone surveys"--Abstract, page vi. Includes abstracts in English and French. Pinto abalone British Columbia. Abalone populations British Columbia. Invertebrate surveys British Columbia. Ormeau nordique British Columbia. Ormeaux (Mollusques) Populations British Columbia. Invertébrés Inventaires British Columbia. Canada. Department of Fisheries and Oceans, issuing body. Canadian technical report of fisheries and aquatic sciences ; 3330. (CaOODSP)9.504449 PDF 2.89 MB https://publications.gc.ca/collections/collection_2020/mpo-dfo/Fs97-6-3330-eng.pdf