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In Situ Comparison of Daily Photosynthetic Activity Patterns of Saxicolous Lichens and Mosses in Sierra De Guadarrama, Central Spain

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In Situ Comparison of Daily Photosynthetic Activity Patterns of Saxicolous Lichens and Mosses in Sierra De Guadarrama, Central Spain The Bryologist 102(4), pp. 623-633 Copyright © 1999 by the American Bryological and Lichenological Socicty, Inc. In situ Comparison of Daily Photosynthetic Activity Patterns of Saxicolous Lichens and Mosses in Sierra de Guadarrama, Central Spain BURKHARD SCHROETER Botanisches Instituí, Universitat Kiel, OlshausenstraBe 40, D-24098 Kiel, Federal Republic of Germany LEOPOLDO GARCÍA SANCHO Departmento de Biología Vegetal II, Facultad de Farmacia, Universidad Complutense, E-28040 Madrid, Spain FERNANDO VALLADARES Centro de Ciencias Medioambientales, CSIC, Serrano 115 dpdo., E-28006 Madrid, Spain Abstract. Diurnal time courses ofin situ photosynthetic acñvity oflichens and mosses growing on a granitic boulder in Sierra de Guadarrama, central Spain, were measured during five days in October, 1993. A portable chlorophyll fluorometer was used for assessing photosynthetic ac- tivity offour lichen and two bryophyte species together with photosynthetic photon flux density (PPFD) incident at the thallus surface and thallus temperature. The quantum efficiency of pho- tosystem 11 (PSII; AF/Fm'), and the apparent electrón transpon rate through PSIl (AF/Fm' X PPFD) were calculated. The weather changed from wet to dry conditions during the period of measurements. Exposure- and species-related differences in the photosynthetic performance were observed. Both moss species, Hedwigia ciliata and Grimmia pulvinata, showed no sign of thallus drying and the photochemical efficiency of both species was mainly controlled by the diel patterns of PPFD. In contras!, water loss was the majar limiting factor for metabolic activity in the lichen species. Exposure- and species-related changes in thallus color indicating water loss occurred as early as on 18 October in Umbilicaria spodochroa and with a 24-hr-delay in Lasallia hispánica and Umbilicaria grísea (19 October). In Lasallia pustulata thallus color changes were visible only on 20 October when dry weather induced severe dehydration in all lichen species. Within the same species, different microhabitat resulted in a different physiological performance depending on water balances as well as on PPFD conditions. The data demónstrate the potential of fie Id measurements of chlorophyll a fluorescence as a non-intrusive tool for the analysis of the in situ photosynthetic performance of poikilohydric organisms without altering rates of water loss and uptake, which are always crucial in the photosynthetic performance of poikilohydric organisms under natural conditions. In contrast to attached leaves of higher plants, measure the gas exchange. Modifications to the which are easily accessible (Schulze et al. 1982), technique allowed the in situ measurement of CO2 the 3-dimensional thallus structure of lichens and gas exchange of crustose lichens without removing bryophytes and their often cióse attachment to their them from their substratum (Kappen et al. 1990), substrate cause serious technical problems for in but the system was very laborious and was little situ measurements of photosynthetic activity of used. Recently, Lange and coworkers (Lange & these poikilohydric organisms. The development of Green 1996; Lange et al. 1997) developed a fixed the CO2-porometer (Lange et al. 1984, 1985), versión of the CO2-porometer which by automatic which minimizes the time periods of the exposure enclosure of an epilithic lichen thallus allows un- of the sample in the measuring cuvette, resulted in attended, intermittent measurements of the CO2 gas a substantial increase of knowledge about the di- exchange under natural conditions. However, even urnal photosynthetic activity patterns of crypto- this system has limitations, in particular, the occa- gams under "natural" or semi-natural conditions sional enclosure of the sample in a cuvette will still (Bruns-Strenge & Lange 1991; Hahn et al. 1989, lead to changes in water exchange because of un- 1993; Kappen & Breuer 1991; Kappen et al. 1996; avoidable alterations to the radiation environment Lange et al. 1991, 1996; Sancho et al. 1997a,i>; and through deflection of rain and fog and the sam- Schroeter et al. I99la,b). The crucial problem, ple is still required to be removed from its original however, remained unresolved: the lichen or moss location with consequent disruption from water sample still had to be removed from its habitat at supply from the substrate. regular intervals even if only for short periods to Progress in the measurement of chlorophyll a 0007-2745/99/623-633$ 1.25/0 624 THE BRYOLOGIST [VOL. 102 fluorescence has now made available a different devernia furfuracea (L.) Zopf (Table 1). The eastern and technique for the assessment of photosynthetic ac- southern surfaces of the boulder were also densely cov- ered by lichens, but with fewer mosses. Although cryp- tivity. Primarily used as a tool for the quantification togamic saxicolous communities were dominated by ma- of stress effects on photosynthesis (Krause & Weis crolichens (Table 1), crustose lichens were also frequent, 1991), highly sensitive chlorophyll fluorometers, mainly on eastern and southern exposures. Among them e.g., PAM-technique (Pulse-Amplitude-Aíodula- Aspicilia gr. cinérea, Lecanora bolearía (Follín.) Poelt, Le- cidea atrobrunnea (Lam. & DC.) Schaer., and Protopar- tion), now allow rapid, non-destructive measure- melia badia (Hoffm.) Hafellner were the most common ments of the quantum efficiency of photosystem II crustose species. A list of the macrolichens and mosses (PS II) under ambient light conditions without spe- growing on the different surfaces of the boulder ¡s given cial pre-adaptation of the sample (Bolhár-Norden- in Table 1, together with an Índex of the relative abun- kampf et al. 1989; Schreiber et al. 1986, 1994). dance of each species (Braun-Blanquet 1964). Species studied.—Four different species of macrolich- Portable PAM-systems are now available that allow ens and two moss species were investigated. The species measurements of in situ photosynthetic perfor- were selected to represent different exposure, water uptake mance making them especially suitable for studies strategies, and growth form. Lasallia hispánica (Frey) on samples, such as lichens and mosses, which are Sancho & Crespo is characterized as an aerohygrophytic and photophilic species, while L. pustulata (L.) Mérat is difficult to handle in gas exchange measurements a substrate-hygrophytic lichen that prefers less inclined (Schroeter et al. 1997fo), and for automatic mea- slopes with trickling water (Sancho & Crespo 1989; San- surements over long periods even in extreme en- cho & Kappen 1989). Both species grow sympatricaHy in vironments like the Antarctic (Leisner et al. 1996; the supra- and oromediterranean belts. Umbilicaria spo- Schroeter 1991; Schroeter et al. 1991 b, 1997a). Al- dochroa (Ach.) DC. is a typically substrate-hygrophytic species that occasionally occurs associated with Lasallia though PS II activity measured by fluorescence may species if enough surface water is available. In contras!, allow calculation, with certain assumptions, of CO2 Umbilicaria grísea Hoffm is an aerohygrophytic thermo- fixation for higher plañís (Edwards & Baker 1993; phytic lichen that grows in the supra- and mesomediter- Genty et al. 1989) this is far from certain for lichens ranean belts on strongly inclined or overhanging rock fac- and mosses and, in these groups, it can really only es, more or less protected from rainfall (Sancho & Kappen 1989; Sancho et al. 19976). The moss, Hedwigia ciliata be used as an indicator of activity rather than as an (Hedw.) P. Beauv., shows a nearly cosmopolitan distri- absolute indicator of carbón gain (Green et al. bution and ¡s common on dry granitic boulders and rock 1998; Schroeter et al. 1995; Sundberg et al. 1997). ledges in the open or in forests. Hedwigia ciliata is known In the study presented here we have used the chlo- to grow preferably on inclined to vertical north-facing rophyll a fluorescence yield as a tool to assess the rock walls, which have low potential rales of evaporation and comparatively high water availability (Alpert & Oech- photosynthetic performance of different crypto- el 1984, 1987). Grimmia pulvinata (Hedw.) Sm. ¡s the gams, mosses and lichens, growing together on one most common Grimmia species in Europe. It grows in large boulder in the Sierra de Guadarrama in central small cushions that are able to preserve water for extended Spain. The primary objective was to use the non- periods of time even in dry habitáis (Probst 1986). intrusive methodology to demónstrate the complex Chlorophyll a fluorescence measurements.—The effec- live quantum yield of photosystem II (AF/FnV) of the se- interactions between, position, microclimate, and lected lichen and moss samples was measured in regular plant form that may not be revealed when the sam- intervals using a PAM-2000 portable fluorometer (Walz ples are removed for measurement. Gmbh, FRG) as described in Schroeter et al. (1992). The fluorometer was equipped with a special microquantum and temperature sensor (FL-2030, Walz Gmbh, FRG) and SITE DESCRIPTION, VEGETATION, PLANT MATERIAL, the photosynthetic photon flux density (PPFD, ujnol m 2 AND METHODS s ') incident at the thallus surface as well as the thallus temperature were determined simultaneously with the Research site.—The field study was carried out on a fluorescence measurement. Pulses of measuring and sat- large granitic rock, about 0.5 km from the Estación Bio- urating light were applied through a fibreoptics (ca 0.5 cm geológica del Ventorllo
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