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11 results for “Acanthaster sp.”
Chemosensory behaviour of juvenile crown-of-thorns sea stars (Acanthaster sp.), attraction to algal and coral food, and avoidance of adult conspecifics
<p>Intraspecific and habitat-mediated responses to chemical cues play key roles in structuring populations of marine species. We investigated the behaviour of herbivorous-stage juvenile crown-of-thorns sea stars (COTS: <em>Acanthaster</em> sp.) in flow-through choice chambers to determine if chemical cues from their habitat influence movement and their transition to becoming coral predators. Juveniles at the diet transition stage were exposed to cues from their nursery habitat (coral rubble-crustose coralline algae -CCA), live coral, and adult COTS to determine if waterborne cues influence movement. In response to CCA and coral as sole cues juveniles moved toward the cue source and when these cues were presented in combination, they exhibited a preference for coral. Juveniles moved away from adult COTS cues. Exposure to food cues (coral, CCA) in the presence of adult cues resulted in variable responses. Our results suggest a feedback mechanism whereby juvenile behaviour is mediated by adult chemical cues. Cues from the adult population may deter juveniles from the switch to corallivory. As outbreaks wane, juveniles released from competition may serve as a proximate source of outbreaks, supporting the juveniles-in-waiting hypothesis. The accumulation of juveniles within the reef infrastructure is an underappreciated potential source of COTS outbreaks that devastate coral reefs.</p>
Chemosensory behaviour of juvenile crown-of-thorns sea stars (Acanthaster sp.), attraction to algal and coral food, and avoidance of adult conspecifics
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FIGURE 9 in A new species of crown-of-thorns sea star, Acanthaster benziei sp. nov. (Valvatida Acanthasteridae), from the Red Sea
FIGURE 9. Oral pedicellariae, showing species-specific variation among (A) Acanthaster benziei sp. nov., (B) A. planci, (C) A. mauritiensis, and (D) A. cf. solaris.
FIGURE 7 in A new species of crown-of-thorns sea star, Acanthaster benziei sp. nov. (Valvatida Acanthasteridae), from the Red Sea
FIGURE 7. Typical latero-oral spines, showing species-specific variation among (A) Acanthaster benziei sp. nov., (B) A. planci, (C) A. mauritiensis, and (D) A. cf. solaris.
FIGURE 6 in A new species of crown-of-thorns sea star, Acanthaster benziei sp. nov. (Valvatida Acanthasteridae), from the Red Sea
FIGURE 6. Typical primary spines, showing species-specific variation among (A, B) Acanthaster benziei sp. nov., (C) A. planci, (D) A. mauritiensis, and (E) A. cf. solaris.
FIGURE 5 in A new species of crown-of-thorns sea star, Acanthaster benziei sp. nov. (Valvatida Acanthasteridae), from the Red Sea
FIGURE 5. Typical colouration of Acanthaster benziei sp. nov. (A) GW4081 (Paratype, hiding during the day under a crevice), Al-Lith, Saudi Arabia, (photo credit: Oliver Voigt), (B–D) Thuwal Reefs, Saudi Arabia (photo credit: Gert Wörheide). Approximate diameter of specimens is 25–30 cm.
FIGURE 4 in A new species of crown-of-thorns sea star, Acanthaster benziei sp. nov. (Valvatida Acanthasteridae), from the Red Sea
FIGURE 4. Acanthaster benziei sp. nov. (holotype GW4202) (A-B) Aboral spines, (C-F) oral spines and (G-H) pedicellariae of four adult specimens of Acanthaster benziei sp. nov.: (A) Primary spines, (B) Secondary spines, (C) Latero-oral spines, (D) Circumoral spines, (E) Oral spines, (F) Subambulacral spines, (G) Aboral pedicellariae, (H) Oral pedicellariae.
FIGURE 2 in A new species of crown-of-thorns sea star, Acanthaster benziei sp. nov. (Valvatida Acanthasteridae), from the Red Sea
FIGURE 2. Ethanol-preserved specimens of the type series. GW4202 (A) is the holotype, all the others (B–D) are paratypes. Note that individual GW4266 is a juvenile specimen. Size of labels 6 × 2 cm.
FIGURE 1 in A new species of crown-of-thorns sea star, Acanthaster benziei sp. nov. (Valvatida Acanthasteridae), from the Red Sea
FIGURE 1. Illustrations of pedicellariae and spines (A–C). A: Subambulacral spines, top: bundle with two equally long spines each, bottom: bundle with four unequal long spines; B: Aboral pedicellariae with two valves; C: Close up of part of one arm of paratype GW4081, showing three different spine types indicated by arrows: latero-oral spines (dark blue), oral spines (yellow), subambulacral spines (turquoise). The actinal pedicellariae (red) are associated with the first row of oral spines.
FIGURE 3. A in A new species of crown-of-thorns sea star, Acanthaster benziei sp. nov. (Valvatida Acanthasteridae), from the Red Sea
FIGURE 3. A: Indo-Pacific 'Acanthaster planci' species complex, COI ML tree based on the haplotype alignment of Vogler et al. (2008), supplemented with five samples from Israel (see text for details) extracted from full mitochondrial genome sequences from Yuasa et al. (2021) and four sequences of the type series of Acanthaster benziei sp. nov. (GW4xxx, highlighted in bold). The tree was rooted with Acanthaster brevispinus (accession number AB231476), showing the deep divergence among, and little diversity within, species/geographic clades. ML bootstrap values are above branches, bootstrap values of the NJ clustering of haplotypes below branches. B: Geographic distribution of COI-barcoded clades and of type localities of names (Figure 1 from Haszprunar et al. 2017): red—Red Sea (RS) species; blue—Southern Indian Ocean (SIO) species (A. mauritiensis); yellow—Northern Indian Ocean (NIO) species (A. planci); green—Pacific Ocean (PO) species (A. cf. solaris). Location of type localities of nominal Acanthaster species: asterisk—A. planci; cross—A. echinites; triangle—A. solaris, square—A. mauritiensis; circle—A. ellisii pseudoplanci; "?" - the type locality of A. ellisii was not specified: in South American waters of the East Pacific.
FIGURE 8 in A new species of crown-of-thorns sea star, Acanthaster benziei sp. nov. (Valvatida Acanthasteridae), from the Red Sea
FIGURE 8. Circumoral spines, showing species-specific variation among (A, B) Acanthaster benziei sp. nov., (C) A. planci, (D) A. mauritiensis, and (E) A. cf. solaris.
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