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The sea urchin, Anthocidaris crassispina, is a common herbivore on shallow rocky coasts in the warm temperate region of Japan. Although, this sea urchin is known as the cause of continuing “barren sea urchin grounds” in the situation of high densities, there are limited data about its population dynamics. To understand the population dynamics, especially the causes for it reaching high densities, monitoring of A. crassispina was carried out at a boulder coast on Tachibana Bay, Nagasaki Prefecture, Japan, over a fourteen-year period. The densities of A. crassispina varied from 0.03 to 3.8 ind./m6 Their densities dramatically decreased in the years 1991, 1995, and 2003, and the causes must be the disturbances due to typhoons. After those decreases, their densities rapidly increased by the large recruitment and remained high as long as a typhoon did not strike. From these results, temporally occurring large recruitments and high survival rates except for typhoon were the causes to make A. crassispina high densities. Because the high recruitments only occurred in the years when a typhoon struck, the disturbance by the typhoon must have some positive e#ects on the recruitment of A. crassispina. Key Words: Anthocidaris crassispina, population dynamics, recruitment, sea urchin, typhoon <=>?@ AB = C DE FGH < I J"K, = C LM#N HOB<&" PQR ST UV W X!@ H Y@ Z[\#" (reviewed by Lawrence 1975; Estes & Duggins 1995; Scheibling et al. 1999)6 Y Y@= <]^ _`Mab (Cowen et al. 1982; Fletcher 1987; Prince 1995) c (Pearse & Hines 1979; Miller 1985; Liddell & Ohlhorst 1986; Carpenter 1990)R (Cowen et al. 1982; Ebeling et al. 1985) d F ef C DE gF Y@h[i [\#" 6 Lawrence (1975) =jkl2 mn C < N op qrJ H sW@M# tuvw J" Y@ xI#x Ry gx@ Bz {|<}~ #" 6 Utchicke et al. (2009) =   FG" !@M# "9*"<&" O< &#<U!Y@<~ high-risk high-gain$<@ @Ma6 9 =Y  }#=b 1 Strongylocentrotus nudusn=  Hh[ x % FG % & Y@ ' [h o\#"  1997; Agatsuma et al. 19986  a j12R()*h[  d + niF GH% }b (Balch & Scheibling 2000; Rowley 1989; Wing et al. 2003; Lamare & Barker 2001), 1 @   ¡¢0 S. droebachiensis n=,-#  )£ J"Y@ # ¤<J? x gF <ia[ @¥.o\#" (Hart & Scheibling 1988; Agatsuma et al. 1998)6 o[ ¦"§ ̈©K @ J"QR K@n.af S. spp. « H"Y@h[¬ f ¤ ­H @¥.Ma. (Rowley 1989)R    1 S. franciscanus ® =/F ̄ °n9±!h Y@h[ /F ̄ 2\K<03M#" @ 1 ́ (Tegner & Dayton 1977; Rogers-Bennett et al. 1995)i}b +f ¤ix <μ¶ sW@·I[\ 6 F Received 11 Jan. 2011 Accepted 4 Aug. 2011 Corresponding author TEL: 095 86

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Population dynamics of the sea urchin &lt;i&gt;Anthocidaris crassispina&lt;/i&gt; on the boulder coast of Tachibana Bay, Nagasaki Prefecture, with special reference to the influence of typhoons