Study on the Zonation of Macro Algae

Sugawara, Akihito; Seto, Masabumi; Komatsu, Toshimitsu

doi:10.2208/prooe.14.29

Cited by 2 publications

(2 citation statements)

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“…Thus, the wave force environment experienced by seaweeds early in their life most likely affects the strength of their attachment to hard substrata. Sugawara et al (1998) found that the attachment strength of Eisenia bicyclis (Kjellman) Setchell in shallow water exceeded that of Ecklonia cava Kjellman attached in deeper water at the same study site. Sugawara et al (1998) postulated that the disparity in attachment strengths reflected differences in wave force as a function of depths.…”

Section: Introductionmentioning

confidence: 84%

“…A piece of twine was attached around each stipe immediately above the holdfast and looped onto the scale spring. The twine was pulled away from the rock surface until the holdfast released or broke, as described by Sugawara et al (1998). The scale pointer recorded the maximum force exerted, and this measure was used as an indicator of the force required to: (i) dislodge the holdfast or the substratum surface to which it was attached or (ii) break the stipe or holdfast.…”

Section: Methodsmentioning

confidence: 99%

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Attachment strength of the subtidal seaweed Sargassum horneri (Turner) C. Agardh varies among development stages and depths

Sakamoto

Komatsu

2016

J Appl Phycol

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Sargassum horneri is one of the most important contributors to the rafts of floating seaweed in the waters off the coasts of northeastern Asia. These rafts serve as spawning and nursery grounds for many marine organisms, including Japanese saury and yellowtail. Thus, the details of the attachment/detachment mechanisms of S. horneri are of commercial significance for the aquaculture industry. Here, we describe variations in the attachment strength of S. horneri as it relates to its developmental stage and depth along a bottom gradient. We measured the attachment strength/dislodgement force of S. horneri samples with holdfast detachment in Shidagaura Cove, Shimoda, Japan, from December 2014 to May 2015. After we had determined the dislodgement forces required to detach thalli from the substratum (using a spring scale device) in the field, we transferred released individuals to the laboratory and measured selected morphological traits. Attachment strength was linearly related to the holdfast basal area when thalli were immature (prior to mid-March), but not when they were mature (mid-March to May). Thus, attachment strength was maintained through the reproductive phase and declined thereafter, allowing released thalli to join the drifting raft community. Rafting may be a mechanism by which the species expands its distribution range, as floating thalli continuing to shed germlings that are able to recruit when suitable habitat is encountered. Attachment strengths were greater in the shallows than in deeper water, reflecting the differences in wave forces experienced at different depths.

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Section: Introductionmentioning

confidence: 84%

Section: Methodsmentioning

confidence: 99%