Cross‐shelf transport causes recruitment to intertidal populations in central California

Farrell, Terence M.; Bracher, David O.; Roughgarden, Jonathan

doi:10.4319/lo.1991.36.2.0279

Cited by 245 publications

(243 citation statements)

References 21 publications

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“…These coastal fronts interact with alongshore current systems, and provide a means for larval dispersal to connect distant populations. Relaxation or reversals in wind stress can lead to downwelling conditions where the warmer offshore surface waters and the coastal fronts are advected back onshore, delivering entrained larval organisms to the nearshore benthic habitat (Roughgarden et al, 1988;Farrell et al, 1991). Several studies have shown that variable recruitment of coastal organisms is related to upwelling dynamics in the California region (Parrish et al, 1981;Hollowed et al, 1987;Ebert and Russell, 1988;Roughgarden et al, 1988;Larson et al, 1994;Wing et al, 1995b;Connolly et al, 2001;Broitman et al, 2005;Laidig et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

“…This is one of the most important mechanistic hypotheses relating the physical transport of pelagic larvae to the nearshore environment (Roughgarden et al, 1988;Cury and Roy, 1989;Farrell et al, 1991). In most ecological studies of invertebrate recruitment, upwelling dynamics have been examined at relatively fine spatial and temporal scales (Gaines and Bertness, 1992;Wing et al, 1995a;Mace and Morgan, 2006a), from which mechanisms of larval transport could be inferred.…”

Section: Introductionmentioning

confidence: 99%

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Recruitment of coastal fishes and oceanographic variability in central California

Wilson

Broitman

Caselle

et al. 2008

Estuarine, Coastal and Shelf Science

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Recruitment of pelagic larval fishes to the nearshore environment is dependent on a suite of biological and physical processes operating at many spatial and temporal scales. Nearshore circulation processes associated with coastal upwelling are widely upheld as major determinants of year class strength for many rockfishes (Sebastes spp.), but the mechanism by which these processes drive recruitment is largely unknown. We used Standard Monitoring Units for the Recruitment of Fishes (SMURFs) to monitor recruitment of two rockfish complexes (Sebastes spp.) and cabezon (Scorpaenichthys marmoratus) from March to September of 2004 and 2005 at 3 sites along the central California coast. We examined the relationship between recruitment of these fishes and measurements of oceanographic variability associated with upwelling dynamics, including in situ water temperature, AVHRR sea surface tempera ture, the Bakun upwelling index, and an index of alongshore surface water transport. We found that rockfish comprising the KCGB complex (Sebastes atrovirens, Sebastes caurinus, Sebastes carnatus, Sebastes chrysomelas) recruit during early summer, while fishes of the BYO complex (Sebastes melanops, Sebastes flavidus, Sebastes serranoides), as well as cabezon recruit during late summer. Our results provide limited support for an association between the arrival of juvenile pelagic rockfish and cabezon to the nearshore environment and physical processes related to upwelling and relaxation. Beyond the limitations of our bimonthly sampling scheme, the lack of a clear pattern may be related to the near absence of upwellingrelaxation cycles along this stretch of coast during these two study periods. Moreover, the settlement and recruitment of nearshore fishes may be closely tied to processes occurring earlier in the larval stage.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Recruitment of coastal fishes and oceanographic variability in central California

Wilson

Broitman

Caselle

et al. 2008

Estuarine, Coastal and Shelf Science

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“…Upon entering the water column, the survival of larvae is mostly affected by predation (Rumrill 1990) and the availability of food (Morgan 1995). Once the larvae are competent to settle, the physical processes necessary for their onshore displacement (Shanks 1983, Farrel et al 1991, Pineda 1991, 1999, Le Fèvre & Bourget 1992, Shanks et al 2000 interact with small-scale hydrodynamics (Eckman 1983), larval behavior (Le Fèvre & Bourget 1992), the availability of suitable substrate (Raimondi 1988, Minchinton & Scheibling 1993, and early post-settlement mortality (Gosselin & Qian 1997, Hunt & Scheibling 1997, Jarrett 2000 to result in highly variable spatial and temporal patterns in recruitment.…”

Section: Introductionmentioning

confidence: 99%

Spatially heterogeneous, synchronous settlement of Chthamalus spp. larvae in northern Baja California

Ladah¹,

Tapia²,

Pineda³

et al. 2005

Mar. Ecol. Prog. Ser.

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We evaluated the spatial variability in barnacle settlement at scales of 10s to 100s of meters (among-sites: 300 m; within-site: 30 m) along 1 km of coastline in the Bay of Todos Santos, northern Baja California, Mexico. Settlement of the intertidal barnacles Chthamalus spp. was monitored daily from April 1 to May 10, 2002, and thereafter every other day to September 18, 2002. Concurrently, temperature of the water column was measured every 15 min, and hourly wind speed and direction data were acquired from a nearby site. We identified 12 settlement pulses during our study, with all but 2 pulses showing significant differences in mean settlement at either or both spatial scales. Despite a high variability in numbers, settlement pulses were synchronous between sites. The occurrence of settlement pulses was significantly correlated with a rapid increase in the stratification of nearshore waters, but not correlated with sudden fluctuations in the direction of winds perpendicular to the shore. Sudden changes in the stratification of nearshore waters have been associated with the occurrence of internal tidal bores. Our results suggest that internal motions, more specifically internal tidal bores, could be an important mechanism for the onshore transport of larvae in the Bay of Todos Santos. KEY WORDS: Synchronous settlement · Spatial variability · Intertidal barnacle · Chthamalus · Baja CaliforniaResale or republication not permitted without written consent of the publisher

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“…Previous work has documented that both barnacles and mussels recruit heavily but intermittently throughout summer in Oregon (9). Recruitment events of barnacles in California (15) and Oregon † † often follow upwelling relaxation, i.e., times when larvae are transported shoreward. Barnacles and mussels create 3D spatial structure (habitat) in rocky intertidal communities and are the primary food for many predators (16).…”

mentioning

confidence: 99%

Delayed upwelling alters nearshore coastal ocean ecosystems in the northern California current

Barth

Menge

Lubchenco

et al. 2007

Proc. Natl. Acad. Sci. U.S.A.

300

267

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Wind-driven coastal ocean upwelling supplies nutrients to the euphotic zone near the coast. Nutrients fuel the growth of phytoplankton, the base of a very productive coastal marine ecosystem [Pauly D, Christensen V (1995) Nature 374:255-257]. Because nutrient supply and phytoplankton biomass in shelf waters are highly sensitive to variation in upwelling-driven circulation, shifts in the timing and strength of upwelling may alter basic nutrient and carbon fluxes through marine food webs. We show how a 1-month delay in the 2005 spring transition to upwelling-favorable wind stress in the northern California Current Large Marine Ecosystem resulted in numerous anomalies: warm water, low nutrient levels, low primary productivity, and an unprecedented low recruitment of rocky intertidal organisms. The delay was associated with 20-to 40-day wind oscillations accompanying a southward shift of the jet stream. Early in the upwelling season (May-July) off Oregon, the cumulative upwelling-favorable wind stress was the lowest in 20 years, nearshore surface waters averaged 2°C warmer than normal, surf-zone chlorophyll-a and nutrients were 50% and 30% less than normal, respectively, and densities of recruits of mussels and barnacles were reduced by 83% and 66%, respectively. Delayed early-season upwelling and stronger late-season upwelling are consistent with predictions of the influence of global warming on coastal upwelling regions.climate variability ͉ coastal marine ecosystems ͉ coastal ocean upwelling ͉ marine ecology E quatorward winds along the eastern boundaries of the world's oceans drive offshore surface Ekman transport and the upwelling of cold, nutrient-rich water into the euphotic zone near the coast. These nutrient pulses stimulate high phytoplankton production, which, in turn, supports a rich coastal marine ecosystem and productive fisheries (1). Examples of such dynamics include the California Current, the Humboldt Current, the Benguela Current, and the Canary Current (2).The strength and extent of the seasonal cycle in upwellingfavorable winds varies along the U.S. west coast. In the northern California Current Large Marine Ecosystem (CCLME), there is a strong seasonal cycle with upwelling-favorable winds, the appearance of cold, saline, nutrient-rich water near the coast, and equatorward currents over the shelf occurring after a spring transition (3). Alongshore winds in the northern CCLME are more variable than those farther south because they are more frequently influenced by eastward-traveling Gulf of Alaska low-pressure systems. The intermittent cessation of upwelling-favorable winds is called relaxation and plays an important role in coastal circulation and the recruitment of marine organisms † † . The timing of the spring transition and the total amount of upwelling-favorable winds during the spring-summer upwelling season have a considerable impact on coastal ecosystem responses. Farther south in the CCLME, winds are more persistently upwelling-favorable and the transition to a more productive spring-su...

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Cross‐shelf transport causes recruitment to intertidal populations in central California

Cited by 245 publications

References 21 publications

Recruitment of coastal fishes and oceanographic variability in central California

Recruitment of coastal fishes and oceanographic variability in central California

Spatially heterogeneous, synchronous settlement of Chthamalus spp. larvae in northern Baja California

Delayed upwelling alters nearshore coastal ocean ecosystems in the northern California current

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