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Physiological Snapshots Reflect Ecological Performance of the Sea Palm, Postelsia Palmaeformis (Phaeophycaea) Across Intertidal

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Physiological Snapshots Reflect Ecological Performance of the Sea Palm, Postelsia Palmaeformis (Phaeophycaea) Across Intertidal J. Phycol. 42, 548–559 (2006) r 2006 by the Phycological Society of America DOI: 10.1111/j.1529-8817.2006.00223.x PHYSIOLOGICAL SNAPSHOTS REFLECT ECOLOGICAL PERFORMANCE OF THE SEA PALM, POSTELSIA PALMAEFORMIS (PHAEOPHYCEAE) ACROSS INTERTIDAL ELEVATION AND EXPOSURE GRADIENTS1 Karina J. Nielsen2 Department of Biology, Sonoma State University, Rohnert Park, California 94928, USA Carol A. Blanchette Marine Science Institute, University of California, Santa Barbara, California 93106, USA Bruce A. Menge and Jane Lubchenco Department of Zoology, Oregon State University, Corvallis, Oregon 97339, USA Postelsia palmaeformis Ruprecht is an intertidal in areas where mussels are lacking but not on less kelp found only on very wave-exposed rocky shores wave-exposed shores. of the northeast Pacific. In areas dominated by mus- Key index words: demography; desiccation; eco- sels, Postelsia depends on wave-induced disturbanc- logy; PAM fluorometry; physiology; Postelsia palm- es to complete its life-history cycle. Postelsia also aeformis; rocky intertidal; wave exposure recruits where mussels are absent, but not at less wave-exposed shores. Thus, physical conditions re- Abbreviations: A, absorptance; a, initial slope of a lated to wave exposure limit its horizontal distribu- photosynthesis–irradiance curve; DF/Fm, maximum 0 0 tion. It is not clear what limits the vertical quantum yield of fluorescence; DF /F m, quantum distribution of Postelsia. We investigated factors yield of fluorescence; E, irradiance; ETRa, area-spe- contributing to Postelsia’s limited distribution using cific photosynthetic electron transport rate; Ek, light transplant experiments, demographic monitoring, saturation parameter; ETRm, maximum area-specif- and field fluorometry to evaluate growth and per- ic photosynthetic electron transport rate; MHHW, formance across gradients of tidal elevation and mean higher high water; MLLW, mean lower low wave exposure. Survivorship and growth were water; PAM, pulse-amplitude-modulation; RLCs, sharply reduced at upper and wave-protected edg- rapid light curves es relative to mid-level, wave-exposed sporophytes. Reproductive output was reduced at upper and low- er levels, and growth but not survivorship was lower The sea palm, Postelsia palmaeformis Ruprecht, is an at the lower level. Effects were independent of pop- endemic, intertidal kelp of the northeast Pacific. It has ulation of origin and were a manifestation of the a disturbance-facilitated, annual life history that appar- environment. Maximum electron transport rates ently restricts its distribution to wave-exposed habitats (ETRm), light saturation parameters (Ek), and max- (Dayton 1973, Paine 1979). Algal spores are typically imum quantum yields (DF/Fm) provided insight into shed in the summer, and their survivorship through physiological dynamics; all were lowest at the high the microscopic gametophyte phase is enhanced on edge, but increased when desiccation stress was al- the moist and shaded rocky surfaces below intact mus- leviated by a mock sea-spray treatment. The ETRm sel beds (Blanchette 1996). Juvenile sporophytes typ- and Ek values of low sporophytes were not as high as ically sprout up in early spring in wave-ripped patches the values for mid-sporophytes, despite higher or formed in the mussel bed during winter storms (Day- equivalent nitrogen content, chl a, and absorptance, ton 1973, Paine 1979, 1988, Blanchette 1996). In the suggesting a trade-off between light-capturing and absence of disturbance, mussels preemptively exclude carbon-fixation capacity. Physiological limitations Postelsia from space on the shore (Dayton 1973). How- at upper and lower levels and deleterious desicca- ever, Postelsia can and does recruit to habitats where tion effects at wave-protected sites prevent estab- mussels are absent (Paine 1988). However, it is notable lishment, thus constraining Postelsia to a mid-zone, that Postelsia is absent from wave-protected shores wave-exposed distribution. Physical conditions re- where mussel beds are lacking. It is not clear what de- lated to wave exposure may limit the horizontal dis- termines the vertical limits of Postelsia distribution. tribution of Postelsia because this kelp is also found A paradigm of intertidal ecology is that lower dis- tributional limits of species are set by biological inter- 1Received 19 September 2005. Accepted 28 February 2006. actions, while upper limits are set by physical factors 2Author for correspondence: e-mail [email protected]. (Connell 1972). A parallel paradigm (or perhaps more 548 POSTELSIA PHYSIOLOGY AND ECOLOGY 549 aptly put, a perpendicular paradigm) exists for limits below its naturally occurring intertidal distribution, we trans- along wave exposure gradients, with biological inter- planted juvenile Postelsia from a wave-exposed mid-zone hab- actions prevailing at wave-protected locations and itat to these locations at DB. Holdfasts of juvenile physical factors prevailing at wave-exposed locations sporophytes were chiseled from the rocky bench keeping enough rock intact and attached below the haptera to embed (Menge and Sutherland 1976, 1987). Our observations it in an epoxy-putty (Z-spars) lined cavity chiseled into the suggest that Postelsia is limited by some combination of substratum at the desired transplant location. Ninety indi- desiccation or temperature at the upper edges of its viduals were transplanted in this manner: 30 each to low, distribution as it is often bleached and eventually mid,andhightidalheights,andthenwithineachtidalheight sloughs off at high tidal heights. We have also observed 10 of the 30 transplants were allocated to wave-exposed, in- that Postelsia is smaller in size at three of the four edges termediately exposed, or wave-protected locations. Individ- uals transplanted in the high and low levels or to the wave- of its intertidal distribution: the lower edge, the upper protected locations were placed just beyond the distribution edge, and the wave-protected edge. These observa- of naturally occurring Postelsia, while individuals transplant- tions suggest that additional factors impacting growth ed to mid-tidal heights at exposed or intermediate wave ex- and survivorship of Postelsia sporophytes work in con- posures were within the distributional boundaries of extant cert with disturbance and limited spore dispersal to populations at this site. Furthermore, individuals transplant- constrain Postelsia’s local distribution. ed to mid-tidal height wave-exposed locations (location of origin) served as manipulation controls. Relative wave expo- We hypothesized that the smaller stature of Postelsia sure was confirmed by measurements of maximum wave at the three distributional edges (upper, lower, and forces made using dynomometers (Bell and Denny 1994) for more protected) was the result of physiological stress. a 24 h period once each month between June and November Specifically, we postulated that this reduction in phys- (Blanchette 1994). Although we do not have any genetic data, iological performance likely contributes to its charac- it is likely that the transplanted individuals were closely re- teristic distribution pattern by reducing growth, lated because Postelsia has very limited dispersal and the in- survivorship, and reproductive output of individuals dividuals were taken from one location within a single source population (Coyer et al. 1997). living at the edges of the species local distribution. Al- Demographic monitoring. At DB in 1993 transplanted indi- though it is commonly accepted that physiological viduals were censused each month between April and No- stress can reduce the ecological performance of organ- vember. Stipe length, basal stipe diameter, number of isms at the edges of their distributions, few studies have blades, and length and width of four haphazardly chosen documented ecological and physiological performance blades were measured for each surviving individual. Thus, simultaneously in the field. We used a three-pronged survivorship was also monitored monthly as part of each census. For comparative purposes, we also monitored approach to investigate Postelsia’s physiological toler- haphazardly selected, naturally occurring individuals adja- ance to conditions encountered at the edges of its nat- cent to high, mid, and low transplants during August. In the ural distribution: physiological measurements, ecolog- high and low levels, we selected the highest and lowest dis- ical experiments, and demographic monitoring. We tributed individuals, respectively, closest to transplanted measured the physiological performance of Postelsia individuals. thalli in the high, mid, and low parts of its vertical dis- In 2002 we performed monthly demographic monitoring of the Postelsia population at FC, where we also took our phys- tribution using a pulse-amplitude-modulation (PAM) iological measurements. On March 26, we mapped the location fluorometer. We performed a common garden exper- of 15 haphazardly selected individuals within the high, mid, iment, transplanting individual Postelsia from a mid- and low levels by triangulation from two stainless steel marker Postelsia zone, wave-exposed site to high-, mid-, and bolts just above Postelsia’s upper limit and measured the stipe low-level habitats at each of three levels of wave expo- length of each mapped individual. Survivorship, stipe length, sure. We also monitored growth and survivorship of and number of blades were measured on April 30, June 10, transplanted individuals and of naturally occurring in-
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