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Title: Internal skeletal analysis of the colonial azooxanthellate scleractinian Dendrophyllia cribrosa using microfocus X-ray CT images: Underlying basis for its rigid and highly adaptive colony structure.
Authors: Sentoku, Asuka
Morisaki, Hitomi
Masumoto, Shinji
Ohno, Rie
Tomiyama, Takayuki
Ezaki, Yoichi
Author's alias: 千徳, 明日香
Keywords: Colony construction
Adaptive structure
Growth form
X-ray CT analysis
Issue Date: Jan-2015
Publisher: Elsevier Inc.
Journal title: Journal of structural biology
Volume: 189
Issue: 1
Start page: 37
End page: 43
Abstract: Dendrophyllid Scleractinia exhibit a variety of colonial morphologies, formed under the strict constraints on (1) budding sites, (2) orientations of the directive septa of offsets, (3) inclination of budding direction, and (4) those constraints in every generation. Dendrophyllia cribrosa exhibits a sympodial dendroid form, characteristically large coralla, and occasional fusions of adjacent branches within the same colony. Adjacent corallites are bound and supported by coenosteum skeleton. This study examined the inner skeletal structures at the junctions of fused branches using a non-destructive microfocus X-ray computed tomography (CT) imaging approach, and considered the reasons for the large colonial sizes and their adaptive significance. Three-dimensional reconstructions of two-dimensional X-ray CT images reveal that individual corallites are not directly connected in fused parts. Additionally, no completely buried individuals were found within fused skeleton. When adjacent branches approach one another, constituent corallites change their growth directions to avoid collisions between the branches. The adjacent branches fuse without a reduction in the number of constituent corallites, leading to the establishment of reticular and rigid colonial structures. In addition, a nearly even distribution of individuals on the colony surface facilitates efficient intake of nutrients. Thus, the growth of large D. cribrosa colonies involves avoidance of collision between constituent individuals, the reinforcement of colonial structure, and efficient uptake of nutrients. These observations provide insights on the dynamics of interrelationships between colony-making mechanisms and the adaptive strategies required under habitat conditions such as specific current activities.
Rights: © 2014 Elsevier Inc.
This is not the published version. Please cite only the published version.
DOI(Published Version): 10.1016/j.jsb.2014.11.002
PubMed ID: 25463019
Appears in Collections:Journal Articles

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