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European Journal of Phycology Phenology and Small-Scale This article was downloaded by: [Fac De Ciencias Est Profesionales] On: 17 November 2009 Access details: Access Details: [subscription number 909150612] Publisher Taylor & Francis Informa Ltd Registered in England and Wales Registered Number: 1072954 Registered office: Mortimer House, 37- 41 Mortimer Street, London W1T 3JH, UK European Journal of Phycology Publication details, including instructions for authors and subscription information: http://www.informaworld.com/smpp/title~content=t713725516 Phenology and small-scale distribution of some rhodomelacean red algae on a western Mediterranean rocky shore Fabio Rindi a; Francesco Cinelli b a Martin Ryan Marine Science Institute and Department of Botany, National University of Ireland, Galway, Ireland. b Dipartimento di Scienze dell'Uomo e dell'Ambiente, Università di Pisa, Via A. Volta 6, 56126 Pisa, Italy. To cite this Article Rindi, Fabio and Cinelli, Francesco'Phenology and small-scale distribution of some rhodomelacean red algae on a western Mediterranean rocky shore', European Journal of Phycology, 35: 2, 115 — 125 To link to this Article: DOI: 10.1080/09670260010001735701 URL: http://dx.doi.org/10.1080/09670260010001735701 PLEASE SCROLL DOWN FOR ARTICLE Full terms and conditions of use: http://www.informaworld.com/terms-and-conditions-of-access.pdf This article may be used for research, teaching and private study purposes. Any substantial or systematic reproduction, re-distribution, re-selling, loan or sub-licensing, systematic supply or distribution in any form to anyone is expressly forbidden. The publisher does not give any warranty express or implied or make any representation that the contents will be complete or accurate or up to date. The accuracy of any instructions, formulae and drug doses should be independently verified with primary sources. The publisher shall not be liable for any loss, actions, claims, proceedings, demand or costs or damages whatsoever or howsoever caused arising directly or indirectly in connection with or arising out of the use of this material. Eur. J. Phycol. (2000), 35: 115–125. Printed in the United Kingdom 115 Phenology and small-scale distribution of some rhodomelacean red algae on a western Mediterranean rocky shore FABIO RINDI1 AND FRANCESCO CINELLI2 " Martin Ryan Marine Science Institute and Department of Botany, National University of Ireland, Galway, Ireland # Dipartimento di Scienze dell’Uomo e dell’Ambiente, UniversitaZ di Pisa, Via A. Volta 6, 56126 Pisa, Italy (Received 13 July 1999; accepted 18 January 2000) Distribution and phenology of some filamentous species of Rhodomelaceae in the low littoral and shallow sublittoral zones of an exposed, western Mediterranean rocky shore were studied for 1 year. The spatial distribution of many species shows a pronounced small-scale (metres or tens of metres) variability. Boergeseniella fruticulosa was most abundant in spring and fertile (tetrasporangia only) in spring and summer. Polysiphonia flocculosa was most abundant in spring and summer and reproductive throughout the year. Polysiphonia opaca was most abundant in summer and fertile in spring–summer. Maximal vegetative development and reproduction of Lophosiphonia cristata were observed in summer; conversely, Polysiphonia ceramiaeformis and Polysiphonia subulata were best developed and mostly reproductive in winter and spring. Womersleyella setacea was the least abundant of the studied species and apparently reproduced only by vegetative growth and fragmentation. The reproductive phenology of the species investigated is generally in agreement with reports for other Mediterranean regions. The life history traits of most species are typical of seaweeds in which environmental factors directly govern the onset of the main activities of the organism by meeting the primary physiological needs (‘season responders’). Key words: algal turfs, Boergeseniella, distribution, Lophosiphonia, Mediterranean Sea, phenology, Polysiphonia, Womersleyella Introduction littoral are the only relatively recent, available mono- graphs. Other contributions are essentially floristic Species of Polysiphonia and similar genera consist of finely accounts, sometimes reporting distributional or pheno- branched filaments formed by a central axial filament logical details, or isolated records (Cormaci et al., 1998). covered by whorls of periaxial cells (i.e. ‘polysiphonous’ An important aspect of the biology of Mediterranean structure). Polysiphonia is one of the largest genera in the Rhodomelaceae for which few detailed data are available Rhodophyta, with few to many species occurring on is the vegetative and reproductive phenology. In the virtually all coasts of the world (Womersley, 1979), from study of marine ecosystems in which benthic algae are cold (Kjellman, 1883) to tropical waters (Hollenberg dominant, it is very important to know when the different 1968a, b). Polysiphonia species are among the most species grow and reproduce (Kain, 1986). Recruitment of Downloaded By: [Fac De Ciencias Est Profesionales] At: 21:46 17 November 2009 common filamentous algae in many intertidal and shallow macroalgae may result from regeneration from stolons or subtidal ecosystems and some species extend their holdfasts of previous residents left behind on the rock or distribution to deeper waters (Womersley, 1979) and low- from an influx of propagules from plants in adjacent areas salinity habitats (Fralick & Mathieson, 1975). (Kain & Norton, 1990). As the nature of the latter As a result of the floristic and ecological importance of inoculum is dependent on seasonal changes in the fertility this algal group, studies on Polysiphonia relate mainly to of local plants, the reproductive phenology of macroalgae species identification based on morphological features (see is of critical importance for the recolonization of disturbed Yoon, 1986, and references therein). Although there have sites and may determine the kind of assemblage that been several studies of cytology (Tripodi, 1971, 1974; occupies these areas. For the Mediterranean, phenological Kapraun, 1978; Goff & Coleman, 1986, 1990; Oates & observations are available for some regions and some Cole, 1989) and reproductive biology (Hommersand & algal groups (Cormaci et al., 1984, and references therein; Fredericq, 1990; Kaczmarska & Dowe, 1997), less work Soto & Conde, 1989; Boisset, 1992). With a few has been carried out on other aspects of the biology of this exceptions, however, these observations are occasional group. Most of the published information for the and are not the result of studies specifically designed to Mediterranean area dates back to the nineteenth and early elucidate the patterns of growth and reproduction of algal twentieth centuries (Preda, 1909, and references therein); species. In most cases, neither the number of plants on the studies of Lauret (1967, 1970) for the Languedoc which the observations are based nor the criteria followed in their collection are mentioned; this does not allow an Correspondence to: F. Rindi. assessment of the reproductive peaks, which can be F. Rindi and F. Cinelli 116 determined by the ratio between the number of fertile Table 1. Sea surface temperatures in the north-western plants and the total number of plants collected in each Mediterranean in the period October 1997–September 1998. season (Kain, 1982; Cormaci et al., 1984). For these reasons, knowledge of the phenology of most Medi- Date Temperature (mC) terranean macroalgae is still uncertain and not as detailed as for several northern European species (Kain, 1982, 21 October 1997 21n3 1986; Maggs & Guiry, 1987; Cunningham et al., 1993; 25 November 1997 15n6 6 December 1997 14n8 Kain & Bates, 1993; Molenaar & Breeman, 1994; 23 January 1998 11n9 Molenaar et al., 1996a, b; Molenaar & Breeman, 1997). 10 February 1998 12n2 Preliminary floristic investigations determined the 26 March 1998 13n1 quantitative abundance and structural importance of 20 April 1998 15n6 12 May 1998 16n8 species of Polysiphonia and similar genera, such as 10 June 1998 23n8 Boergeseniella, Lophosiphonia and Womersleyella, in the 24 July 1998 26 benthic algal assemblages of some coastal areas of north- 18 August 1998 26n7 western Italy. A detailed study was conducted from 12 September 1998 24n5 September 1997 to November 1998 to elucidate the spatial and temporal distribution of the most common species. measurements made at k1 m depth at a site near Punta Bianca (La Spezia, north-western Italy), about 50 km north Materials and methods of the study site. These data were not available during the summer months, so temperature was measured at the Study site study site (k0n5 m depth) by the thermal sensor of a SCUBA watch (Citizen Aqualand) (Table 1). Daylength is The study was carried out between Castel Boccale and longest in June (up to 15n30 h) and shortest in December Punta Pacchiana (43m 30h N, 10m 20h E), 10 km south of (about 8n50 h). Livorno (north-western Italy); the site is a stretch of rocky Filamentous Rhodomelaceae are most abundant in the shore with a horizontal extent of about 1 km (Fig. 1). The lower littoral zone and in the sublittoral fringe. These coast consists of sandstone platforms that extend 300 m zones correspond respectively to the mean level of water seaward, to a depth of about k40 m (Airoldi et al., 1996). surface and the shallowest part of the sublittoral; they The shore is exposed to strong wave action and open to occupy a belt with a vertical extent of 25–30 cm, starting winds from the south-east to north-west; the tidal range
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