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The sea anemone Telmatactis cricoides from Madeira and the Canary Islands: size frequency, depth distribution and colour polymorphism
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Abstract(s)
A anémona do mar Telmatactis cricoides (Duchassaing, 1850) dos arquipélagos da Madeira (n = 81 anémonas) e das Canárias (n = 124 anémonas) foi estudada entre 0 e 62 m de profundidade. São descritos e comparados o polimorfismo cromático, a frequência de tamanhos e a frequência em profundidade das duas populações de anémonas. Registaram-se vinte e cinco padrões de coloração distintos. Encontrou-se uma correlação do, embora fraca (R = +0.20) entre o tamanho e a profundidade de ocorrência. Os dois tipos de coloração mais frequentes não diferem na sua distribuição em profundidade e são igualmente frequentes nos dois arquipélagos. Onze formas cromáticas são exclusivas das Canárias, três da Madeira, enquanto as restantes onze foram registadas nos dois arquipélagos. O padrão de coloração dos indivíduos parece estável, sendo de 12 anos o registo mais antigo, para um indivíduo observado desde 1983.
ABSTRACT: The club-tipped sea anemone Telmaractis cricoides (Duchassaing. 1850) of Madeira (n = 81 anemones) and of the Canary Islands (n = 124 anemones) was studied in a depth range of 0 to 62 m. Colour polymorphism, size frequency and depth frequency of the two populations of anemones are described and compared. Twenty-five different colour morphs were recorded. There was a significant but only weak (r = +0.20) correlation between anemone size and depth of occurrence. The two most common colour morphs did not differ in their depth distributions. The two most common colour morphs were equally frequent in both archipelagos. Eleven colour morphs were exclusive to the Canary Islands, three to Madeira – the remaining eleven being common to both areas. Colour pattern of individual animals appears to be stable, the longest record being 12 years for an animal observed since 1983.
ABSTRACT: The club-tipped sea anemone Telmaractis cricoides (Duchassaing. 1850) of Madeira (n = 81 anemones) and of the Canary Islands (n = 124 anemones) was studied in a depth range of 0 to 62 m. Colour polymorphism, size frequency and depth frequency of the two populations of anemones are described and compared. Twenty-five different colour morphs were recorded. There was a significant but only weak (r = +0.20) correlation between anemone size and depth of occurrence. The two most common colour morphs did not differ in their depth distributions. The two most common colour morphs were equally frequent in both archipelagos. Eleven colour morphs were exclusive to the Canary Islands, three to Madeira – the remaining eleven being common to both areas. Colour pattern of individual animals appears to be stable, the longest record being 12 years for an animal observed since 1983.
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Keywords
Anémona do Mar Telmatactis cricoides Canárias Madeira Canary Islands
Citation
"ARQUIPÉLAGO. Ciências Biológicas e Marinhas = Life and Marine Sciences". ISSN 0873-4704. Nº 14A (1996): 1-5.