ebert et al 1994 recruitment patterns in urchins

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Ebert et al.. Sea urchin settlement

7

C istic differences betw een central and no rthern Califor-77 7S 4 C 3 '"

nia. At Naples Reef near Santa Barbara, Rowley (1989)

a , 0, -5I

0 2 sampled very small Strongylocentrotus spp. from 1984=.- yL !A

3 to 1986 and, during that period, he observed a single7

n

7

a pulse of recruitment in May 1986. By compar ing sizez :o ranges in the field with those obtained underm : -aU <P , laboratory conditions, he inferred that animals in the7 7 a7 , a "d

field were from 5 to 17 d old, which makes the.--I I settlement season similar to the settlement times wea 4

I a, 2 observed in the Santa Barbara area.Y E 07 7 2 0 Temporal and spatial differences in settlem ent of re dn

5 .2

z 0 and purple sea urchins correlate with general oceano-0

KO .- U a graphic processes along the California coast. Annual

U) "0) > V )

U a 0, c settlement of both species was more variable in the7 7 -7 7 ' north, which correlates with the retention of wat erI S 3 5U 4 2 within the Southern California Bight and greaterIY

IL 5 advection rates in northern California (Owen 1980,

7@ J

0

7

o3 & Parrish et al. 1981, Huyer 1983, Kosro et al. 1991).

z Z 20

- Ther e was virtually no settlement of se a urchins at the

U) : g E northern sites in 1990 and the average number ofa 4 0 , 0

-, - - 2 settlers was low in 1991; however, in each of t he next 27

I

7

4 years, large numbers of purple sea u rchins settled andU U bS I v, red sea urchin settlers were present in low to moderateLL U

cdnumbers. This change in settlement pattern coincided

m * 0 W 0 W 0

with an El Niiio event that s tarted late in 1991 and c on-

Number of Sea Urchins per Brush C tinued throug h the 1993 settlement season (Haywa rd

Number of Sea Urchins per Brush



5 2 Mar. Ecol Prog. Ser. 111: 41-52, 1994

ment chara cteristics of the commercially harvested red

sea urchin Strongylocentrotus franciscanus in Southern

British Columbia. Can ada . Fish. Res. 5 55-69

Strathmann, M. (1987). Reproduction a nd deve lopment of

marine in verte brat es of the northern Pacific coast. Unlv. of

Washington Press, Seattle

Strathmann, R. (1978). Length of pelagic period in echino-derms with feeding larvae from the northeast Pacific.

J. exp. mar. Biol. Ecol. 34: 23-27

Tegner, M. J. (1989). The feasibility of enhancing red sea

urchin, Stronqylocentrotus franciscanus, stocks in Cali-

This article was submitted to the editor

fornia: an analysi s of the options. Mar . Fish. Rev. 51: 1-22

Tegner, M . J., Dayton, P. K (1981). Populat~on tructure,

recruitment and mortal~ty f two sea urchins (Strongylo-

centrotus franciscanus and S. purpuratus) In a kelp forest.

Mar. Ecol. Prog. Ser. 5: 255-268

Thomas, A. C., Strub, P. T (1990). Seasonal and interannua l

variability of phytoplankton pigment concentrationsacross a California Curre nt system frontal zone. J geo-

phys. Res. 95: 13023-13042

Young, R. G . (1982). Fluorescent a ge pigm ent in Insect lyso-

somes. Exp. Gerontol. 17. 1-6

Manuscript first received: November 2, 1993

Revised version accepted: May 2, 1994

ebert et al 1994 recruitment patterns in urchins

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