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Temporal variation in vegetative development of Caulerpa scalpelliformis (Chlorophyta) from Baleia beach, Ilha Grande bay (Rio de janeiro, brazil)

Abstracts

Caulerpa scalpelliformis grows on rocky and sandy bottoms at different depths in Jacuacanga Cove, Ilha Grande Bay, where it can form dense patches. The invasive behavior of this and other species of Caulerpa is well documented in the literature. This study analyzed the variation of the vegetative development of C. scalpelliformis from Baleia Beach (23º01'63''S and 44º14'18''W) in Jacuacanga Cove, from June 2003 to September 2004, including plants from rocky and sandy substrates. Morphometric and dry weight data from the erect and prostrate portions were used. Plants were collected from 20 x 20 cm² plots (n=3), randomly positioned on the rocky boulders (≅1.5 m depth) and on contiguous sandy bottom (≅3.0 m depth). During the study period, C. scalpelliformis occurred on both substrates as a pseudo-perennial species, showing partial loss of the erect portions from winter to spring; the height and dry weight of the erect portions increased from summer to autumn on both substrates. The temporal variation of C. scalpelliformis vegetative development in Baleia Beach was similar to that described for the invasive C. racemosa and C. taxifolia from different geographical regions of the world.

Brazil; Caulerpales; Chlorophyta; invasive species; rocky shores; sandy bottom; temporal variation; vegetative development


Caulerpa scalpelliformis cresce sobre substrato rochoso e arenoso a diferentes profundidades na Enseada de Jacuacanga, Baía da Ilha Grande, onde pode formar bancos densos. O comportamento invasor desta e de outras espécies de Caulerpa é bem documentado na literatura. Este estudo analisou a variação do desenvolvimento vegetativo de C. scalpelliformis da Praia da Baleia (23º01'63''S e 44º14'18''W), Enseada de Jacuacanga, de junho de 2003 a setembro de 2004, considerando plantas do substrato rochoso e do fundo de areia. Dados morfométricos e de peso seco das porções prostrada e ereta foram usados. Plantas foram coletadas em quadrados de 20 cm de lado (n=3), posicionados aleatoriamente sobre o substrato rochoso (profundidade ≅ 1,5 m) e sobre o substrato arenoso (profundidade ≅ 3,0 m). Durante o período de estudo, C. scalpelliformis ocorreu nos dois substratos como espécie pseudo-perene, mostrando perda parcial das porções eretas do talo do inverno para a primavera; altura e massa seca das porções eretas mostraram tendência de aumento do verão para o outono nos dois substratos. A variação temporal do desenvolvimento vegetativo de C. scalpelliformis na Praia da Baleia foi similar à descrita para C. racemosa e C. taxifolia, espécies invasoras em diferentes regiões do mundo.

bioinvasão; Brasil; Caulerpales; Chlorophyta; costões rochosos; substrato arenoso; variação temporal; desenvolvimento vegetativo


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Publication Dates

  • Publication in this collection
    29 Sept 2016
  • Date of issue
    June 2011

History

  • Accepted
    20 Sept 2010
  • Reviewed
    23 Aug 2010
  • Received
    08 Oct 2009
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