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- W2005503085 abstract "MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsTheme Sections MEPS 282:161-171 (2004) - doi:10.3354/meps282161 Sweeper tentacles of the brain coral Platygyra daedalea: induced development and effects on competitors Einat D. Lapid1, Jeffrey Wielgus1, Nanette E. Chadwick-Furman1,2,* 1Interuniversity Institute for Marine Science, PO Box 469, Eilat, Israel and Faculty of Life Sciences, Bar Ilan University, Ramat Gan, Israel 2Present address: Biological Sciences Department, 101 Rouse Life Sciences Building, Auburn University, Auburn, Alabama 36849-5407, USA *Corresponding author. Email: chadwick@auburn.edu ABSTRACT: Benthic marine organisms utilize an array of defensive and aggressive mechanisms that affect competition for space on hard marine substrata. The sweeper tentacles of stony corals are inducible aggressive organs used during competition, but they also may serve a pre-emptive defensive function. About half of the colonies of the brain coral Platygyra daedalea at Eilat, northern Red Sea, possess sweeper tentacles, many of which are not directed toward neighboring corals. These randomly oriented sweeper tentacles may be produced in order to detect the settlement or advance of corals occurring at >5 cm distance from the colony. Of coral colonies <5 cm distant from P. daedalea, about 43% exhibit tissue damage facing the interaction area. Adjacent corals with the most damage belong to the genera Favites and Leptastrea, while colonies of Millepora and congeneric Platygyra exhibit significantly less damage. Tissue damage of neighboring coral colonies decreases significantly with increasing distance from P. daedalea. The presence of sweeper tentacles on brain corals correlates significantly with colony diameter, but not with the number of neighboring colonies. The aggressive reach of P. daedalea in Eilat is 5.3 ± 3.0 cm, longer than previously reported for members of this genus. Under laboratory conditions, sweeper tentacles develop on P. daedalea colonies about 30 d following initial contact with colonies of the common massive coral F. complanata, and at approximately 50 d they reach a maximum length of about 6.5 cm, 10× longer than feeding tentacles. Sweeper tentacles cause increasing tissue damage to F. complanata colonies over 2 mo. During morphogenesis, their tip-to-stalk ratio and ectoderm thickness doubles, indicating acrosphere development, but maximal width of the tentacle stalk does not change. Sweeper tentacles appear to be a common agonistic mechanism among stony corals, and may serve also as a defensive mechanism that allows the persistence of some species in crowded reef habitats. KEY WORDS: Competition · Reef coral · Aggression · Defense · Behavior · Eilat · Red Sea Full text in pdf format PreviousNextExport citation RSS - Facebook - Tweet - linkedIn Cited by Published in MEPS Vol. 282. Online publication date: November 16, 2004 Print ISSN: 0171-8630; Online ISSN: 1616-1599 Copyright © 2004 Inter-Research." @default.
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- W2005503085 title "Sweeper tentacles of the brain coral Platygyra daedalea: induced development and effects on competitors" @default.
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