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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/46277

Title: Summer mortality: effects on the distribution and abundance of the acorn barnacle Tetraclita japonica on tropical shores
Authors: Benny K. K. Chan
David Morritt
Maurizio De Pirro
Kenneth M. Y. Leung
Gray A. Williams
Contributors: 國立臺灣海洋大學:海洋生物研究所
Keywords: Distribution
Tetraclita
Barnacle
Summer mortality
Date: 2006
Issue Date: 2018-05-14T06:21:43Z
Publisher: Marine Ecology Progress Series
Abstract: Abstract: In the Hong Kong rocky intertidal, the demography of the acorn barnacle Tetraclita japonica is largely determined by regular, intense mortality events in the summer and subsequent pulses of recruitment in late summer. During 2 consecutive summers from 2000 to 2001, 34 to 52 and 98 to 99% of T. japonica were killed on the mid- and high shore, respectively, with younger cohorts suffering higher mortality in the mid-shore. Recruitment of T. japonica occurs in late summer; as a result, the population in the high shore consists of a single cohort of new recruits, while the mid-shore supports 2 cohorts (new recruits and adult survivors). To investigate how thermal stress affects acorn barnacle populations, air and rock temperatures and sub-lethal physiological measures (body temperature, sinus pulsation rate and haemolymph osmolality) of T. japonica were taken on the mid- and high shore during daytime, low spring tides in June–July 2001. Mean body temperature increased gradually after emersion, reaching a maximum of ~48°C at noon, 6 to 8°C higher than the adjacent rock surface. T. japonica entered a heat-induced coma when body temperatures reached 45°C. Osmolality of the haemolymph and sinus pulsation rate increased with body temperature as a result of water loss and possibly altered haemolymph pressure; both were greater in high than in mid-shore individuals, with barnacles on horizontal surfaces being hotter than those on vertical surfaces. Body temperature and sinus pulsation rate differed between shore levels, but were similar at spatial scales of 1 to 20 m at the same tidal height. Haemolymph osmolality, however, varied over this distance, probably due to individual variation in the amount of mantle water trapped before emersion and possible micro-habitat differences. Heat and desiccation stress, therefore, play an important role in determining the life history of T. japonica by limiting their distribution and abundance and influencing the demography of the population at different spatial scales.
Relation: 328 pp.195-204
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/46277
Appears in Collections:[海洋生物研究所] 期刊論文

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