Growth form-dependent response to physical disturbance and thermal stress in Acropora corals

S. Muko, Seiji Arakaki, M. Nagao, Kazuhiko Sakai

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

To predict the community structure in response to changing environmental conditions, it is necessary to know the species-specific reaction and relative impact strength of each disturbance. We investigated the coral communities in two sites, an exposed and a protected site, at Iriomote Island, Japan, from 2005 to 2008. During the study period, a cyclone and thermal stress were observed. All Acropora colonies, classified into four morphologies (arborescent, tabular, corymbose, and digitate), were identified and tracked through time to calculate the annual mortality and growth rate. The mortality of all Acropora colonies in the protected site was lower than that in the exposed site during the period without disturbances. Extremely higher mortality due to bleaching was observed in tabular and corymbose Acropora, compared to other growth forms, at the protected sites after thermal stress. In contrast, physical disturbance by a tropical cyclone induced the highest mortality in arborescent and digitate corals at the exposed site. Moreover, arborescent corals exhibited a remarkable decline 1 year after the tropical cyclone at the exposed site. The growth of colonies that survived coral bleaching did not decrease in the following year compared to previous year for all growth forms, but the growth of arborescent and tabular remnant corals at the exposed site declined severely after the tropical cyclone compared to previous year. The delayed mortality and lowered growth rate after the tropical cyclone were probably due to the damage caused by the tropical cyclone. These results indicate that the cyclone had a greater impact on fragile corals than expected. This study provides useful information for the evaluation of Acropora coral response to progressing global warming conditions, which are predicted to increase in frequency and intensity in the near future.

Original languageEnglish
Pages (from-to)269-280
Number of pages12
JournalCoral Reefs
Volume32
Issue number1
DOIs
Publication statusPublished - Mar 14 2013

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physical disturbance
Acropora
thermal stress
growth form
hurricanes
corals
coral
tropical cyclone
mortality
cyclone
disturbance
coral bleaching
bleaching
global warming
community structure
environmental conditions
Japan
damage
environmental factors

All Science Journal Classification (ASJC) codes

  • Aquatic Science

Cite this

Growth form-dependent response to physical disturbance and thermal stress in Acropora corals. / Muko, S.; Arakaki, Seiji; Nagao, M.; Sakai, Kazuhiko.

In: Coral Reefs, Vol. 32, No. 1, 14.03.2013, p. 269-280.

Research output: Contribution to journalArticle

Muko, S. ; Arakaki, Seiji ; Nagao, M. ; Sakai, Kazuhiko. / Growth form-dependent response to physical disturbance and thermal stress in Acropora corals. In: Coral Reefs. 2013 ; Vol. 32, No. 1. pp. 269-280.
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