Premium
Temperature‐length growth strategies in the littoral alga Ascophyllum nodosum (L.) 1
Author(s) -
Strömgren Tor
Publication year - 1983
Publication title -
limnology and oceanography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.7
H-Index - 197
eISSN - 1939-5590
pISSN - 0024-3590
DOI - 10.4319/lo.1983.28.3.0516
Subject(s) - ascophyllum , elongation , littoral zone , growth rate , maximum temperature , algae , botany , biology , horticulture , physics , atmospheric sciences , materials science , ecology , mathematics , geometry , metallurgy , ultimate tensile strength
The growth in length of Ascophyllum nodosum (L.) apices is greatly enhanced during brief temperature increases. This temperature‐related increase in length is linearly correlated to light intensity. Maximum elongation rate is found during 5–10 min of exposure. During the first hour of exposure, elongation rates are linearly correlated with temperature up to 35°C. At 6 h of exposure an optimum temperature for growth in length is indicated at 22.5°C. The elongation rates decrease with time, suggesting that resources are used up. The renewal of these resources under normal conditions is linearly correlated with time. Elongation rates induced by high temperature are followed by rates lower than normal after the temperature exposure. However, for exposures of 1–4 h, there is an increase in overall rate of elongation. The results indicate that the main part of the length growth in A. nodosum takes place during low tide when the alga is exposed to heating by air and sun.