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Luminous capabilities and life-history traits of the polychromatic ophiuroid Amphipholis squamata in two isolated populations from Oliveri-Tindari lagoon system, Sicily
Dupont, S.; Mallefet, J. (2000). Luminous capabilities and life-history traits of the polychromatic ophiuroid Amphipholis squamata in two isolated populations from Oliveri-Tindari lagoon system, Sicily. Hydrobiologia 440(1-3): 137-144. dx.doi.org/10.1023/A:1004154707305
In: Hydrobiologia. Springer: The Hague. ISSN 0018-8158, more
Peer reviewed article  

Also published as
  • Dupont, S.; Mallefet, J. (2000). Luminous capabilities and life-history traits of the polychromatic ophiuroid Amphipholis squamata in two isolated populations from Oliveri-Tindari lagoon system, Sicily, in: Jones, M.B. et al. (Ed.) Island, Ocean and Deep-Sea Biology: Proceedings of the 34th European Marine Biology Symposium, held in Ponta Delgada (Azores), Portugal, 13-17 September 1999. Developments in Hydrobiology, 152: pp. 137-144, more

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Keywords
    Bioluminescence; Colour; Population dynamics; Variability; Amphipholis squamata (Delle Chiaje, 1828) [WoRMS]; Ophiuroidea [WoRMS]; Marine
Author keywords
    bioluminescence; population dynamics; colour variety; microevolution; ophiuroid

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Abstract
    Amphipholis squamata is a small ophiuroid with a worldwide distribution except for Polar regions. Global populations of A. squamata are morphologically uniform but inter- and intrapopulational variability occurs at levels from the population to the genotype. The species is polychromatic and two colour varieties (dark-brown and spotted) from two adjacent populations (separated from each other for only 20 years) in a lagoonal system (Sicily) were compared using bioluminescence and life-history traits as indicators of variability. The dark- brown variety was dominant in Lago Nuovo and the spotted one was dominant in Porto Vecchio. Important variations were observed within populations, however, there were significant differences in life-history traits and luminous capabilities between the dark-brown and spotted varieties. The dark-brown variety invested more energy in somatic growth than reproduction (1 cohort each year and growth rate of 0.279 mm each month). whereas energy was devoted mainly to reproduction in the spotted variety (4 cohorts each year and growth rate of 0.171 mm each month). The chronology of the life cycles was completely different between the two varieties. Fertilization occurred mainly in spring for the spotted but only in autumn for the dark-brown. Recruitment occurred mainly in autumn for spotted and in spring for dark-brown individuals. Finally, significant differences were observed for maximal intensity of emitted light and kinetic parameters between the two varieties.

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