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Morphological Variation in the Coral Genus Platygyra: Environmental Influences and Taxonomic Implications

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Morphological Variation in the Coral Genus Platygyra: Environmental Influences and Taxonomic Implications MARINE ECOLOGY PROGRESS SERIES Vol. 110: 19-28.1994 Published July 7 Mar. Ecol. Prog. Ser. l Morphological variation in the coral genus Platygyra: environmental influences and taxonomic implications K. J. Miller Marine Biology Department, James Cook University of North Queensland. Townsville, Old. 4811. Australia ABSTRACT: Scleractinian corals are notoriously variable and the high degrees of morphological variation displayed by some species, particularly in response to environmental influences, confound our understanding of species boundaries. In order to fully understand the ranges of variation and the influence of habitat on colonies within the genus Platygyra, levels of intra- and interspecific morpho- logical variation were quantified and colony morphology was examined relative to environmental gradients. Measurements of 9 skeletal characters of colonies of Platygyra were analysed by multi- variate analysis of variance and canonical discriminant analysis to examine morphological species boundaries. While the taxonomic literature suggests the existence of 5 morphological species of Platygyra, results from this study suggest there may be 7 present on the Great Barrier Reef, Australia. A comparison of skeletal characters of 2 species, F? daedalea and F? pini, across 4 different habitats indicates that the environment does not influence skeletal characteristics in these species. Similarly, a detailed survey of distribution patterns of Platygyra spp. indicates that all species occur sympatrically across 6 reef habitats and that colony morphology does not change predictably along environmental gradients. The absence of any association between morphology and habitat in Platygyra suggests environment has little influence on morphology in these species. Numerical techniques are likely to be useful for defining species boundaries in highly variable groups of corals and similarly for under- standing ranges of intraspecific morphological variation. KEY WORDS: Coral . Morphological vanation . Species boundaries INTRODUCTION essary to understand the potential of a species to alter its morphology. Similarly, the potential of an organism Often many species display a wide range of to respond to environmental influences will be rele- morphologies in response to habitat differences. Such vant when considering the range of variation that can environmental influences on morphology have been be exhibited by a single species and ultimately when documented in a variety of taxa, particularly those with considering species boundaries. a sessile mode of life such as plants and corals. The Intraspecific morphological variation is high within ability of an organism to change morphology accord- the Scleractinia and hence its consequences for coral ing to habitat is important not only in taxonomy, but taxonomy are important. The majority of taxonomy in also ecologically and has resulted in the introduction the Scleractinia has been based on morphology (e.g. of concepts such as clines (Huxley 1938), ecotypes Ellis & Solander 1786, Vaughan & Wells 1943, Cheva- (Turesson 1922) and ecomorphs (Veron & Pichon 1976). lier 1975, Veron et al. 1977, although see Lang 1984). Phenotypic responses to environmental influences are Not surprisingly, the existence of high degrees of often high due to heterogeneity of environments and morphological variation has confounded taxonomists, this is particularly relevant in coral reef systems. In resulting in continual reclassification at the species order to understand the processes that determine level. Morphological features may differ from coral to observed patterns of morphological variation, it is nec- coral within a species, even from polyp to polyp within O Inter-Research 1994 Resale of full article not permitted 20 Mar. Ecol. Prog. Ser. 110: 19-28, 1994 a colony, and are likely to be highly inconsistent be- phological variation is necessary. This paper aims to tween species groups (e.g. Veron et al. 1977). Numeri- apply numerical taxonomic methods, in particular cal taxonomic methods have been applied to some canonical variate analysis, to examine morphological groups of corals with success (e.g. Powers & Rohlf 1972, variation both within and between species of Platy- Wallace 1974, Brake1 1977) and may prove extremely gyra. In addition, spatial distribution patterns of mor- useful not only in improving the consistency of assign- phological variants of Platygyra are documented and ing corals to species groups but also in understanding morphological differences are examined relative to morphological variation within species (Foster 1980, environmental gradients. By combining such informa- Van Veghel & Bak 1993). tion, morphological species boundaries, the range of Habitat influences may contribute to much of the intraspecific morphological variation and the role of morphological variation in corals and variation in habitat on the morphology of Platygyra species can be skeletal characters has been reported to correspond more fully understood. with environmental parameters such as depth (Barnes 1973) and Light attenuation (Jaubert 1977, Graus & Macintyre 1982).Transplant experiments have demon- METHODS strated the effect of habitat on both colony shape (Dustan 1975, Oliver et al. 1983, Willis 1985) and cali- Interspecific variation. Sampling: Colonies of Platy- cular skeletal characters (Foster 1979). Conversely, gyra daedalea, P sinensis, P pini and P ryukyuensis morphological vanation in some species may be solely (ider~iiiieciin ihe fie16 according to Veron et a!. 1977, genetically controlled (e.g. Pavona cactus; Willis 1985, Veron 1986) were collected from Davies Reef, central Willis & Ayre 1985). While it is now widely accepted Great Barrier Reef (18"51' S, 147" 38' E). A fifth species, that a single coral species may display a wide variety of P lamellina, was not found at Davies Reef, hence morphotypes (e.g.Veron 1981j, species boundaiies in colocirs were collected frox Orpheus Island (18" 35' S: some groups remain unclear. Faviid corals in particular 146" 29' E). Large portions (approximately 30 X 30 cm) represent a highly variable taxonomic group in which were chiselled from colonies for morphometric analysis morphological characters of different species inter- to examine skeletal differences between species grade (Wijsman-Best 1974, Veron et al. 1977). groups. Colonies from a range of depths and habitats The genus Platygyra occurs throughout the Indo- (see below) were used in order to encompass the com- Pacific and displays much of the morphological variation plete range of intraspecific variation in defining species associated with the Faviidae, of which it is a member. boundaries. There are no diagnostic skeletal characters Colonies are generally massive with long, meandroid which distinguish the 5 species of Platygyra, hence for valleys, although some colonies may become plate-like. the morphometric comparison of species groups, I used Valley lengths range from monocentric (Ppini) to con- measurements of 9 common skeletal characters (Fig. 1). tinuous (P daedalea). There are 5 species of Platygyra Skeletal characters were measured using a combination currently recorded from the Great Barrier Reef, Aus- of computer image-analysis and hand measurements tralia - P. daedalea, l? sinensis, l? pini, P lamellina and with callipers. An initial pilot study was carried out to P ryukyuensis (Veron 1993) - although species defini- determine within- and between-colony variability for tions are purely qualitative and encompass a broad each skeletal character using estimates of precision and range of variation. There is much apparent overlap in variance components. This study indicated that high skeletal characteristics across species of Platygyra (see sample precision (< 0.2) would be obtained by measur- Stephenson & Wells 1955) and while 'typical' specimens ing 10 replicates of each skeletal character on each of of a species group are easily assigned, it is not always 6 replicate colonies of each species (Miller 1994).Hence possible to allocate any one skeleton to a particular characters were measured in 10 randomly chosen species. Habitat may have an important influence on the polyps or valleys from 6 replicate colonies of each of the morphology of Platygyra colonies. Veron et al. (1977, 5 Platygyra species (except P ryukyuensis where only page 98) state in reference to Platygyra that 'specific 3 colonies were measured). Care was taken when differences may become obscure in large collections measuring valleys to avoid the growing edges of from a variety of biotopes, where the skeletal characters the colonies as these often display atypical skeletal of one species overlap with those of another from a patterns (pers. obs.; see also Barnes 1973). different biotope'. Similarly, Wijsman-Best (1974) Analysis: Data were tested for normality and hetero- suggested that variation in skeletal characters in P dae- scedasticity using SAS (proc GLM). The majority of dalea may be related to depth. characters were normally distributed, hence all analy- In order to remove subjectivity in the determination ses were done on raw data. Mean values of characters of species in the Scleractinia, a more detailed approach for each colony were used in analyses and species to understanding both phenotypic and genotypic mor- groups were compared using multivariate analysis of Mdler. Morphological variation in Platygyra 2 1 Fig. 1. Diagrammatic representation of skeletal measurements taken on colonies of Platygyra. VW: valley width measured from
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