博士 / 國立臺灣大學 / 海洋學系 / 84 / Cology morphology and mechanical properties of sixteen
sympatric alcyonaceans including six Sarcophyton, three
Lobophytum, six Sinularia, and one Nephthea species were
studied. Analyses of drag coefficient, flexibility, elastic
modulus and breaking stress of alcyonacean colonies were
conducted to demonstrate the relationships among colony
morpholgy, deformation, stiffness and strength. The sixteen
alcyonaceans can be classified into three types according to
the colony morphology and mechanical properties. Colonies of
the "type I" alcyonaceans have lower drag coefficient and
flexibility which allow them to remain streamlining and to
reduce drag by staying in the lower-velocity boundary layer.
Colonies of the "type II" alcyonaceans have higher drag
coefficient and flexibility that enable them to bend into drag-
reducing orientations by collapsing the colonies and lying near
the substratum at higher velocities. Colonies of the "type
III" alcyonaceans have intermediate drag coefficient and
flexibility; their deformation does not result in the reduction
of drag, and they resist drag mainly by tissue strength. This
study demonstrates that alcyonaceans are able to avoid, reduce
or resist drag by having low drag coefficient, high flexibility
and high strength. There are trade- offs among the three
mechanisms since each species can not maximize the three
properties simultaneously. The sympatric alcyonaceans possess
different morphological and mechanical properties and they
coexist in the same environment by adopting different
mechanisms to withstand drag.
| Identifer | oai:union.ndltd.org:TW/084NTU00279001 |
| Date | January 1996 |
| Creators | Lin,Ming-Chao, 林明炤 |
| Contributors | Dai,Chang-Feng, 戴昌鳳 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 137 |
Page generated in 0.0014 seconds