Interactive effects of light and temperature on sporophyte production in the giant kelp Macrocystis pyrifera

Deysher, Lawrence; Dean, Thomas A.

doi:10.1007/bf00428650

Cited by 48 publications

(35 citation statements)

References 15 publications

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“…Once spores settle to the bottom, they require firm substrate and sufficient light and nutrients for successful recruitment (Graham et al 2007). The amount of light and nutrients available to recently settled spores can vary greatly in space and time (Deysher and Dean 1986). Therefore spatial autocorrelation in these variables could create spatial patterns in kelp recruitment, which could in turn impact synchrony in adult populations (Nisbet and Bence 1989).…”

Section: Giant Kelp Recruitment Datamentioning

confidence: 99%

Synchrony in dynamics of giant kelp forests is driven by both local recruitment and regional environmental controls

Cavanaugh

Kendall

Siegel

et al. 2013

Ecology

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Populations of many species display spatially synchronous fluctuations in abundance. Synchrony is most commonly attributed to three processes: factors that influence recruitment (e.g., dispersal, early survival), large‐scale environmental variability, and spatially autocorrelated trophic interactions. However it is often difficult to link population synchrony to a specific dominant process, particularly when multiple synchronizing forces are operating. We utilized a new satellite‐based data set of giant kelp (Macrocystis pyrifera) canopy biomass to examine population synchrony in southern California kelp forests on spatial scales ranging from 50 m to 300 km and temporal scales ranging from 1 to 11 years. We examined the relationship between synchrony and distance for adult kelp populations, kelp recruits, sea urchin abundance (a major grazer of kelp), and environmental variables known to influence kelp population dynamics. Population synchrony in giant kelp decreased with distance between populations: an initial rapid exponential decrease between 50 m and 1.3 km was followed by a second, large‐scale decrease between distances of 1.3 km and 172 km. The 50‐m to 1.3‐km spatial scale corresponded to the scales of synchrony in the abundance of sea urchins and young kelp recruits, suggesting that local drivers of predation and recruitment influence small‐scale synchrony in kelp populations. The spatial correlation patterns of environmental variables, particularly wave height, were similar to the synchrony–distance relationship of kelp populations from 1.3 km to 172 km, suggesting that regional environmental variability, i.e., the Moran effect, was the dominant process affecting synchrony at larger spatial scales. This two‐step pattern in the relationship between kelp biomass synchrony and distance was apparent in each of the 11 years of our study. Our results highlight the potential for synthesizing approaches from both landscape and population ecology in order to identify the multiple processes that generate synchrony in population dynamics.

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Section: Giant Kelp Recruitment Datamentioning

confidence: 99%

Synchrony in dynamics of giant kelp forests is driven by both local recruitment and regional environmental controls

Cavanaugh

Kendall

Siegel

et al. 2013

Ecology

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“…Blue light is necessary for gametogenesis in some kelps (Lfining & Dring, 1972), whereas the brown alga Dictyota requires red light (Mfiller & Clauss, 1976). Irradiance levels must exceed certain thresholds in the brown alga Desmarestia (Chapman & Burrows, 1970), in many laminarians (Lfining & Neushul, 1978;Lfining, 1980;Deysher & Dean, 1984, 1986bNovaczek, 1984) and in some freshwater green algae such as Spirogyra (Simons, Van Beem & De Vries, 1982). However, in diatoms, lower irradiance levels can trigger gametogenesis (e.g.…”

Section: The Effect Of Environmental Factors Onmentioning

confidence: 99%

“…Indeed, future studies on the effects of nutrient levels on gametogenesis in the laboratory should continue attempts to relate experimental levels to the conditions and variation that occur in the field (e.g. Hsiao & Druehl, 1973b;Novaczek, 1984;Deysher & Dean, 1986b;Lee & Brinkhuis, 1988). A number of freshwater green algae become reproductive when the CO 2 concentration is increased in the air over the culture medium (e.g.…”

Section: The Effect Of Environmental Factors Onmentioning

confidence: 99%

Gametogenesis, gametes and zygotes: An ecological perspective on sexual reproduction in the algae

Brawley

Johnson

1992

British Phycological Journal

112

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“…The effects of environmental factors on the germination, recruitment, growth, and survivorship of small, easily-studied juvenile stages of giant kelp are well established (Devinney & Volse 197 8, Wheeler & North 1980, Dean & Jacobsen 1984, Deysher & Dean 1984, 1986a, b, Schroeter et al 1995, and there is information on the effects of low nutrient conditions on adult Macrocystis pyrifera survival and growth (Gerard 1982, North & Zimmerman 1984, Zimmerman & Kremer 1984, Zimmerman & Robertson 1985. In a recent analysis of 31 yr of data from the Point Loma kelp forest (Tegner et al 1996), we demonstrated a significant inverse relationship between annual average surface temperature and kelp harvest, a measure of the M. pyrifera canopy.…”

Section: Introductionmentioning

confidence: 99%

Large-scale, low-frequency oceanographic effects on kelp forest succession:a tale of two cohorts

Tegner¹,

Pk²,

Pb³

et al. 1997

Mar. Ecol. Prog. Ser.

108

122

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Two catastrophic-scale storm disturbances of a giant kelp forest community were followed by very different oceanographic conditions, the warm. nutrient-stressed period of the 1982-1984 El Nino and the cold, nutrient-rich La Nina of 1988-1989. Here w e compare the fates of the 2 postdisturbance algal communities, or '2 cohorts', under condltions determined by large-scale, lowfrequency oceanographic events. Succession and population dynamics of the competitive d o m~n a n t kelp. Macrocystis pyrifera, and understory kelps, Pterygophora californlca and Laminaria farlowu, were followed a t 5 permanent sites in the Point Loma kelp forest near San Diego. California, USA. where kelps have been mapped quarterly since 1983. There was intense kelp recruitment after both disturbances. The different oceanographic cond~tions, however, strongly affected the population dynamlcs of M. pynfera and ~t s competitive interactions with the lower standing species. Poor M pyrifera growth, canopy formation, and survival during the El Nino apparently allowed the persistence of understory populations. Extraordinary conditions for M. pyrifera growth during the La Niria were associated with the near extinction of understory populations. The number of stipes per plant and stipe dens~ty are indices of IM, pyr~fera growth and carrying capacity, respect~vely, which appear to be very senslt~ve to environmental condltions. The 2 cohorts exh~blted very different stipe patterns. In both cases, the anomalous oceanographic conditions lasted for about 2 yr after the disturbances, but the effects on kelp community structure persisted for the lives of the M. pyrifera cohorts, despite average or relatively poor conditions later In summary, these data suggest that large-scale, low-frequency oceanographic phenomena are important to kelp forest successional processes, population dynamics, and competitive interactions among kelp guilds

show abstract

Interactive effects of light and temperature on sporophyte production in the giant kelp Macrocystis pyrifera

Cited by 48 publications

References 15 publications

Synchrony in dynamics of giant kelp forests is driven by both local recruitment and regional environmental controls

Synchrony in dynamics of giant kelp forests is driven by both local recruitment and regional environmental controls

Gametogenesis, gametes and zygotes: An ecological perspective on sexual reproduction in the algae

Large-scale, low-frequency oceanographic effects on kelp forest succession:a tale of two cohorts

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