The life history and distribution of Macrocystis in British Columbia coastal waters
department or school: Science, Faculty of
department or school: Botany, Department of
department or school: Zoology, Department of
data provider: DSpace
degree campus: UBCV
creator: Scagel, Robert Francis
issued: 2012-03-21T16:05:42Z
issued: 1948
related degree: Master of Arts - MA
degree grantor: University of British Columbia
description: Only one species, Macrocvatls integrifolia Bory, is present in British Columbia coastal waters. It is found distributed along the whole coast in regions approaching open ocean conditions, but protected against the full ocean force, where the seawater has a specific gravity of over 1.018 at 15 degrees Centigrade and where a suitable rocky bottom, between three feet above to twenty feet below zero tide level, is available. The method of growth of the sporophyte, which is partly dichotomous and partly unilateral, is fully described from the time it is first discernible to the naked eye up to maturity. Dichotomous and subdichotomous divisions of the basal growth region are responsible for the extensive development and perennial habit of the plant. Active zoospore liberation from mature plants and young sporophytes (single, undivided blade stage) were found at least from July 1 to September but the limits were not determined. The gametophytic stages were not followed. Maximum growth (elongation) of Macrocystis recorded was 3.10" per day for a period of 29 days at the north-east of Vancouver Island. No regeneration from the holdfast or at the cut surfaces of stipes were shown as a result of cutting. Stipes of Macro cystis may continue to grow after being severed from their holdfasts. Plants removed to deeper water are retarded in rate of growth. Various practical aspects of this economically important plant are considered. It is believed two harvests per year are possible if proper precautions are taken with respect to the relative position of the terminal laminae of the plants when harvesting. A method of estimating quantities using the diameter of the stipe as an index is suggested.
aggregated CHO: https://circle.library.ubc.ca/rest/handle/2429/41632
note: ^^3 _£y> SA < 3 Co/> . I THE LIFE HISTORY AMD DISTRIBUTION OF M&CROCYSTIS IN BRITISH COLUMBIA COASTAL W&TERS fey Robert Francis; Scagel, B.A. -o-A Thesis submitted i n Partial Fulfilment of The Requirements for the Degree of MASTER OF ARTS In the Department of BIOLOGY AND BOTANY -o-The University of British Columbia October, 194# ABSTRACT: Only one species, Macrocvatls in t e g r i f o l i a Boiy, i s present i n Bri t i s h Columbia coastal waters. I t i s found distributed along the whole coast i n regions approaching open ocean conditions, but protected against the f u l l ocean force, where the seawater has a specific gravity of over 1.018 at 15 degrees Centigrade and where a suitable rocky bottom, between three feet above to twenty feet below zero tide le v e l , i s available. The method of growth of the sporophyte, which i s partly dichotomous and partly unilateral, i s ful l y described from the time i t i s f i r s t discern-ible to the naked eye up to maturity. Dichotomous and subdichotomous div-isions of the basal growth region are responsible for the extensive develop-ment and perennial habit of the plant. Active zoospore liberation from mature plants and young sporophytes (single, undivided blade stage) were found at least from July 1 to September but the limits were not determined. The gametophytic stages were not followed. Maximum growth (elongation) of Macrocystis recorded was 3.10" per day for a period of 29 days at the north-east of Vancouver Island. No regeneration from the holdfast or at the cut.surfaces of stipes were shown as a result of cutting. Stipes of Macro cystis may continue to grow after being severed from their holdfasts. Plants removed to deeper water are retarded i n rate of growth. Various practical aspects of this economically important plant are considered. It i s believed two harvests per year are possible i f proper precautions are taken with respect to the relative position of the term-inal laminae of the plants when harvesting…
has type: Thesis/Dissertation
is shown at: 10.14288/1.0107015
language: eng
degree discipline: Biology
provider: Vancouver : University of British Columbia Library
publisher: University of British Columbia
rights: For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.
scholar level: Graduate
type: Text
identifier URI: http://hdl.handle.net/2429/41632