Research study 4
photograph showing dense settlement of barnacles Chthamalus dalliA 2yr study of 3 species of acorn barnacles around Santa Cruz, California reveals that larvae of Chthamalus fissus settle throughout the year, while those of Balanus glandula settle during a May-June seasonal peak, and ones of Tetraclita squamosa settle “tightly” during a seasonal peak in Oct-Nov. Annual recruitment for Chthamalus measured for a 150-cm2 area is 2 million nauplii yielding 600 recruits; for Balanus: 1.4 million nauplii yielding 160 recruits; and for Tetraclita: 0.3 million nauplii yielding 15 recruits. The author notes that Chtamalus’ life-history characteristics allow it opportunistically to exploit conditions in an extreme and changing environment, while those of Balanus allow it to dominate at lower intertidal levels for parts of the year. Hines 1979 p. 213 In, Reproductive ecology of marine invertebrates (Stancyk, ed.) U South Carolina Press, Columbia.
Dense settlement of Chthamalus dalli amongst Balanus
glandula. Based on the statistics provided above for
C. fissus, each successful adult recruit of Chthamlus
requires the production of over 3000 nauplii 1.3X
Research study 4 photograph showing dense settlement of barnacles Chthamalus dalliA 2yr study of 3 species of acorn barnacles around Santa Cruz, California reveals that larvae of Chthamalus fissus settle throughout the year, while those of Balanus glandula settle during a May-June seasonal peak, and ones of Tetraclita squamosa settle “tightly” during a seasonal peak in Oct-Nov. Annual recruitment for Chthamalus measured for a 150-cm2 area is 2 million nauplii yielding 600 recruits; for Balanus: 1.4 million nauplii yielding 160 recruits; and for Tetraclita: 0.3 million nauplii yielding 15 recruits. The author notes that Chtamalus’ life-history characteristics allow it opportunistically to exploit conditions in an extreme and changing environment, while those of Balanus allow it to dominate at lower intertidal levels for parts of the year. Hines 1979 p. 213 In, Reproductive ecology of marine invertebrates (Stancyk, ed.) U South Carolina Press, Columbia. Dense settlement of Chthamalus dalli amongst Balanusglandula. Based on the statistics provided above forC. fissus, each successful adult recruit of Chthamlusrequires the production of over 3000 nauplii 1.3X
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