Pattern and persistence of a nearshore planktonic ecosystem off Southern California

Barnett, Arthur M.; Jahn, Andrew E.

doi:10.1016/0278-4343(87)90060-4

Cited by 26 publications

(16 citation statements)

References 39 publications

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“…The second step could be explained by the nearshore vertical distribution of cyprids together with the dynamics of large internal bores. The center of distribution of cyprids in nearshore southern California was close to the bottom, in cold or thermocline waters, where the thermocline intersects the seafloor (Barnett & Jahn 1987, Pineda 1991. When the thermocline tilts upward, the cyprids could be found close to the surface (pers.…”

Section: Discussionmentioning

confidence: 98%

Spatial and temporal patterns in barnacle settlement rate along a southern California rocky shore

Pineda¹

1994

Mar. Ecol. Prog. Ser.

129

106

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Barnacle settlement was monitored at 5 sites separated by 50 to 250 m a t Dike Rock, La Jolla, California, USA. Chthamalus spp. and Pollicipes polymerus settlement were spatially correlated at those sites. Within sites, settlement of the 2 species were correlated These results support the hypothesis of common onshore larval transport events for all sites and both species. Other spatiotemporal patterns were contrasting: 1 peak accounted for most of P polymerus settlement, while there were 5 peaks of similar magnitude for Chthamalus spp. At 2 sites, settlement plates were installed at 2 heights in the intertidal; Chthamalus spp. settlement was similar at the 2 heights, while P polyn~erus settlement was relatively different at the sites. Such spatial patterns may have resulted from a stronger behavioral component affecting settlement in P polymerus. These results suggest that, at scales of 100 m, temporal variability in settlement rate may be related to larval pool and physical transport processes, while spatial vanabllity may be associated with behavioral response and substrate availability. Chthamalus spp. settlement was hlgher at sites where rocks were surrounded by unsuitable sandy substrate, possibly because settlement on available substrate is intensified where total suitable settlement area is relatively scarce To test this, plates were installed at another site where suitable substrate was also scarce, as predicted, settlement was higher at both sites. At another study slte in Medio Camino, Mexico, settlement became more predictable anlong sites along the rocky shore after the shoreline had been partially inundated by sand, further supporting this hypothesis. The proportion of unmetamorphosed settlers of Chthamalus spp., relative to total settlement, appeared to peak on particular days of the lunar cycle and was spatially correlated at the 5 sites. The periodicity of the peaks was close to the 14.75 d spnng-to-neap cycle, suggesting that these peaks may be related to periodic shortimmersion hmes that did not allow the attached cypnds to metamorphose. Mortality of recently metamorphosed ( 5 l d ) Chthamalus spp. spat by physical damage was spatially vanable.

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Section: Discussionmentioning

confidence: 98%

Spatial and temporal patterns in barnacle settlement rate along a southern California rocky shore

Pineda¹

1994

Mar. Ecol. Prog. Ser.

129

106

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“…Membranipora cyphonautes were more abundant at depth than at the surface, a result that is consistent with that of Yoshioka's (1982) study. C. fissus is by far the most abundant barnacle in Southern California, and the nearshore barnacle cyprid larvae center of abundance in a Southern California location was at depth (Barnett and Jahn 1987). Chthamalus cyprid abundances on the offshore warm side of the fronts were higher at 4 m than at the surface but were reversed at the fronts.…”

Section: Larval Vertical and Horizontal Distribution-previousmentioning

confidence: 94%

Circulation and larval distribution in internal tidal bore warm fronts

Pineda¹

1999

Limnology & Oceanography

228

238

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Internal tidal bore warm fronts were observed during the summer of 1996 off the coast of Southern California. Warm bore fronts had concentrating currents resulting from high-frequency internal motions and from a larger twoway flow; the two-way flow featured surface currents onshore and bottom currents offshore. A sharp thermocline depression and high-frequency, large-amplitude internal motions followed the leading edge of the bore, with downwelling currents on the trailing side of the crest of the nonlinear internal waves and upwelling currents in front of the crest. Warm bores propagated onshore with a propagation speed, c, that ranged from 10.6 to 19.6 cm s Ϫ1 , while time-averaged frontal currents, ū, varied from 11.2 to 17.6 cm s Ϫ1 in the shallowest bin. In one out of three cases ū Ͼ c, which implied that there were faster currents than the rate of advance of the front and which implied that the origin of surface frontal material is behind the front, not in front of it. Three invertebrate larval taxa were found at all sites across fronts, but only two intertidal barnacles, Pollicipes polymerus and Chthamalus spp., were concentrated at the front's surface, while the subtidal bryozoan Membranipora spp. was not. Frontal Pollicipes were more concentrated than were Chthamalus. The frontal downwelling currents observed suggested that concentrated larvae would have to swim upward in order to maintain depth. Pollicipes were abundant on the offshore warm side of the fronts but were absent or rare on the onshore colder side, suggesting that the origin of frontal Pollicipes was behind the front, although an alternative cannot be ruled out conclusively. Chthamalus were more abundant at depth than at the surface at all sites except at the front, where this pattern was reversed. The origin of frontal Chthamalus is uncertain. Membranipora were more abundant on the onshore colder side of the fronts, and abundances were usually higher at depth than at surface. Lack of accumulation in this species may be due to its limited swimming capability.Benthic communities are often composed of open populations in which recruitment is effectively uncoupled from local fecundity (e.g., Eckman 1996; Stoner et al. 1996). Because larvae of shallow-water invertebrates are generally small and cannot swim long distances, they depend on external transport mechanisms to reach adult habitats (Thorson 1950). To the extent that larval settlement and recruitment depend on external transport, these physical processes must be critically important to population dynamics. The phenomenology associated with larval transport involves larval behavior and physical transport mechanisms. Specific larval behaviors are required to exploit specific transporting or concentrating mechanisms (e.g., Scheltema 1986;Rothlisberg et al. 1995). Physical transport for nearshore species is complicated because it involves characterizing the mechanism of transport as well as its temporal and spatial variability, including the secondary flows responsible for the accumu...

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“…El Niño (several years) Seasonal stratification (months) Accumulation in internal tidal bore warm fronts (seconds to hours) and the constrained nearshore larval distributions of littoral species (Barnett and Jahn, 1987;Tapia and Pineda, 2007), is that the spatial scales of larval transport may be much smaller than previously recognized. These results indicate that small-scale and nearshore physical processes play an important role in larval transport (Kingsford, 1990;Willis and Oliver, 1990;Pineda, 1999 1989).…”

mentioning

confidence: 99%

Larval Transport and Dispersal in the Coastal Ocean and Consequences for Population Connectivity

Pineda¹,

Hare²,

Sponaugle³

2007

Oceanog.

569

444

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Pattern and persistence of a nearshore planktonic ecosystem off Southern California

Cited by 26 publications

References 39 publications

Spatial and temporal patterns in barnacle settlement rate along a southern California rocky shore

Spatial and temporal patterns in barnacle settlement rate along a southern California rocky shore

Circulation and larval distribution in internal tidal bore warm fronts

Larval Transport and Dispersal in the Coastal Ocean and Consequences for Population Connectivity

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