Abstract
During the 1997–1998 El Niño, we examined seasonally a giant kelp population in deep water (25–40 m) off the coast of Northern Baja California. Though most populations in the region completely disappeared, large fertile adults survived the entire warming event at depth. At 25 m, there was no significant change in density or number of fronds per individual during the warming period from spring 1997 to spring 1998, though the surface canopy sloughed off (died) down to 15 m depth. By summer 1998, recruitment occurred at all depths at the site. Adult survival at depth was most likely important in post-disturbance recovery in surrounding populations by occupying substratum, providing vegetative growth, and producing spores. Survival in deep water during this extreme El Niño may have been due to local hydrography, such as internal waves bringing cool nitrate-rich water into the deeper regions of the shelf from below the thermocline, providing a refugium against the warm temperatures, low nutrients, and heavy wave action associated with warming events. Deep-water populations may regularly survive El Niño warming in this region due to internal wave activity, and go undetected due to the depth at which they occur and the sloughing of the shallow (<15 m) biomass.
References
Allen, C., L. Silver and F. Stehli. 1960. Agua Blanca fault – a major transverse structure of Northern Baja California, Mexico. Bull. Geol. Soc. Am.71: 457–482.10.1130/0016-7606(1960)71[467:ABFMTS]2.0.CO;2Search in Google Scholar
Bakun, A. 1973. Coastal upwelling indices, west coast of North America, 1946–1971. NOAA report, NMFS, SSRF-671. pp. 85.Search in Google Scholar
Chavez-Garcia, M. 1975. Algunas condiciones de surgencia durante la primavera de 1974, para el area adyacente a Punta Banda, Baja California. UABC Tesis. pp. 62.Search in Google Scholar
Cota-Villavicencio, A. 1972. Estudio oceanográfico químico de la surgencia localizada en la zona de Punta Banda, Baja California. Tesis de CICESE. pp. 63.Search in Google Scholar
Dayton, P. 1985. Ecology of kelp communities. Ann. Rev. Ecol. Syst.16: 215–245.10.1146/annurev.es.16.110185.001243Search in Google Scholar
Dayton, P. and M. Tegner. 1984. Catastrophic storms, El Niño, and patch stability in a southern California kelp community. Science224: 283–285.Search in Google Scholar
Dayton, P., M. Tegner, P. Parnell and P. Edwards. 1992. Temporal and spatial patterns of disturbance and recovery in a kelp forest community. Ecological Monographs62: 421–445.10.2307/2937118Search in Google Scholar
Deysher, L. and T. Dean. 1986. In situ recruitment of sporophytes of the giant kelp, Macrocystis pyrifera: effects of physical factors. J. Exp. Mar. Bio. Ecol.103: 41–63.Search in Google Scholar
Durazo, R. and T. Baumgartner. 2002. Evolution of oceanographic conditions off Baja California: 1997–1999. Progress in Oceanography54: 7–31.10.1016/S0079-6611(02)00041-1Search in Google Scholar
Edwards, M. 2004. Estimating scale-dependency in disturbance impacts: El Niños and giant kelp forests in the northeast Pacific. Oecologia138: 436–447.10.1007/s00442-003-1452-8Search in Google Scholar
Emery, W. and K. Hamilton. 1985. Atmospheric forcing of inter annual variability in the northeast Pacific Ocean: connection with El Niño. J. Geophys. Res.90: 857–868.10.1029/JC090iC01p00857Search in Google Scholar
Gerard, V. 1982. Growth and utilization of internal nitrogen reserves by the giant kelp, Macrocystis pyrifera, in a low nitrogen environment. Mar. Biol.74: 213–218.Search in Google Scholar
Gerard, V. 1984. Physiological effects of El Niño on giant kelp in Southern California. Mar. Biol. Letters5: 317–322.Search in Google Scholar
Hernández-Carmona, G., Y. Rodríguez-Montesinos, M. Casas-Valdez, M. Vilchis and I. Sanchez-Rodríguez. 1991. Evaluation of the beds of Macrocystis pyrifera in the Baja California Peninsula, Mexico III. Summer 1986 and seasonal variation. Ciencias Marinas17: 121–145.Search in Google Scholar
Hoffman, A. and B. Santelices. 1991. Banks of algal microscopic forms: hypotheses on their functioning and comparisons with seed banks. Mar. Ecol. Prog. Ser.79: 185–194.10.3354/meps079185Search in Google Scholar
Huyer, A. and R. Smith. 1985. The signature of El Niño off Oregon in 1982–83. J. Geophys. Res.90: 7133–7142.10.1029/JC090iC04p07133Search in Google Scholar
Kahru, M. and G. Mitchell. 2000. Influence of the 1997–98 El Niño on the surface chlorophyll in the California Current. J. Geophy. Lett.26: 2937–2940.10.1029/2000GL011486Search in Google Scholar
Kennelly, S. 1987a. Physical disturbances in an Australian kelp community: II. Effects on understory species due to differences in kelp cover. Mar. Ecol. Prog. Ser.40: 155–165.10.3354/meps040155Search in Google Scholar
Kennelly, S. 1987b. Inhibition of kelp recruitment by turfing algae and consequences for an Australian kelp community. J. Exp. Mar. Biol. Ecol.112: 49–60.10.1016/S0022-0981(87)80014-XSearch in Google Scholar
Kinlan, B., M. Graham, E. Sala, and P. Dayton. 2003. Arrested development of giant kelp (Macrocystis pyrifera, Phaeophyceae) embryonic sporophytes: a mechanism for delayed recruitment in perennial kelps. J. Phycol.39: 47–57.Search in Google Scholar
Ladah, L. 2003. The shoaling of nutrient-enriched subsurface water as a mechanism to sustain primary productivity off Central Baja California during El Niño winters. J. Mar. Syst.42: 145–152.10.1016/S0924-7963(03)00072-1Search in Google Scholar
Ladah, L., J. Zertuche-Gonzalez and G. Hernández-Carmona. 1999. Giant kelp (Macrocystis pyrifera, Phaeophyceae) recruitment near its southern limit in Baja California after mass disappearance during ENSO 1997–1998. J. Phycol.35: 1106–1112.Search in Google Scholar
Leichter, J., S. Wing, S. Miller and M. Denny. 1996. Pulsed delivery of subthermocline water to conch reef (Florida Keys) by internal tidal bores. Limnol. Oceanogr.41: 1490–1501.10.4319/lo.1996.41.7.1490Search in Google Scholar
Leichter, J., H. Stewart and S. Miller. 2003. Episodic nutrient supply to Florida coral reefs. Limnol. Oceanogr.48: 1394–1407.10.4319/lo.2003.48.4.1394Search in Google Scholar
Miller, A. 1996. Recent advances in California Current modeling: decadal and interannual thermocline variations. CalCOFI Reports37: 69–79.Search in Google Scholar
Neushul, M. 1963. Studies on the giant kelp Macrocystis II. Reproduction. Am. J. Bot.50: 354–359.10.1002/j.1537-2197.1963.tb07203.xSearch in Google Scholar
North, W. 1971. Introduction and background. In: (W. North, ed.) The biology of giant kelp beds (Macrocystis) in California. J. Cramer, Germany. pp. 123–168.Search in Google Scholar
North, W. 1994. Review of Macrocystis biology. In: (I. Akatsuka, ed.) Biology of economic algae. Academic Publishing, Netherlands, pp. 447–527.Search in Google Scholar
Pineda, J. 1991. Predictable upwelling and the shoreward transport of planktonic larvae by internal tidal bores. Science253: 548–550.10.1126/science.253.5019.548Search in Google Scholar PubMed
Reed, D. and M. Foster. 1984. The effects of canopy shading on algal recruitment and growth in a giant kelp forest. Ecology65: 937–948.10.2307/1938066Search in Google Scholar
Reed, D., D. Laur and A. Ebeling. 1988. Variation in algal dispersal and recruitment: the importance of episodic events. Ecological Monographs58: 321–335.10.2307/1942543Search in Google Scholar
Reed, D., C. Amsler and A. Ebeling. 1992. Dispersal in kelps: factors affecting spore swimming and competency. Ecology73: 1577–1585.10.2307/1940011Search in Google Scholar
Santelices, B., A. Hoffman, D. Aedo, M. Bobadilla and R. Otaiza. 1995. A bank of microscopic forms on disturbed boulders and stones in tide pools. Mar. Ecol. Prog. Ser.129: 215–228.10.3354/meps129215Search in Google Scholar
Schiel, D. and M. Foster. 1986. The structure of subtidal algal stands in temperate waters. Oceanogr. Mar. Biol. Ann. Rev.24: 265–307.Search in Google Scholar
Seymour, R.J. 1998. Effects of El Niños on the west coast wave climate. Shore and Beach66: 3–6.Search in Google Scholar
Seymour, R., M. Tegner, P. Dayton and P. Parnell. 1989. Storm wave induced mortality of giant kelp, Macrocystis pyrifera, in southern California. Estuar., Coast. Shelf Sci.28: 277–292.Search in Google Scholar
Spalding, H., M. Foster and J. Heine. 2003. Composition, distribution, and abundance of deep-water (>30 m) macroalgae in central California. J. Phycol.39: 273–284.Search in Google Scholar
Tegner, M. and P. Dayton. 1987. El Niño effects on Southern California kelp communities. Advances in Ecological Research17: 243–279.10.1016/S0065-2504(08)60247-0Search in Google Scholar
Tegner, M. and P. Dayton. 1991. Sea urchins, El Niños, and long term stability of Southern California kelp forest communities. Mar. Ecol. Prog. Ser.77: 49–63.Search in Google Scholar
Tegner, M., P. Dayton, P. Edwards and K. Riser. 1996. Is there evidence for long-term climatic change in Southern California kelp forests?CalCOFI Reports37: 111–126.Search in Google Scholar
Underwood, A. 1997. Experiments in ecology: their logical design and interpretation using analysis of variance. Cambridge University Press, Cambridge. pp. 504.Search in Google Scholar
Wolter, K., and M. Timlin. 1998. Measuring the strength of ENSO events: how does the 1997/98 rank?Weather53: 315–324.10.1002/j.1477-8696.1998.tb06408.xSearch in Google Scholar
Zar, J. 1984. Biostatistical analysis. Prentice Hall, USA. pp. 718.Search in Google Scholar
Zimmerman, R. and J. Kremer. 1984. Episodic nutrient supply to a kelp forest ecosystem in Southern California. J. Mar. Res.42: 591–604.10.1357/002224084788506031Search in Google Scholar
Zimmerman, R. and D. Robertson. 1985. Effects of El Niño on local hydrography and growth of giant kelp Macrocystis pyrifera, at Santa Catalina Island, California. Limnol. Oceanog.30: 1298–1302.10.4319/lo.1985.30.6.1298Search in Google Scholar
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