Spatial variation patterns of subtidal seaweed assemblages along a subtropical oceanic archipelago: Thermal gradient vs herbivore pressure

Sangil, Carlos; Sansón, Marta; Afonso-Carrillo, Julio

doi:10.1016/j.ecss.2011.07.004

Cited by 54 publications

(47 citation statements)

References 43 publications

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“…Despite the spatial heterogeneity, our results give strong evidence that the documented mortality event affects the short-term (months to a few years) stability of urchin populations. Given the well-known negative relationships between erect algal beds and herbivorous sea urchins (Hernández et al 2008b, Sangil et al 2011, such an event may determine the stability of the community or even drive the transition to a macroalga-dominated system. The ecological effects of the mortality event still need to be investigated on a longer time scale to provide insight into the mechanisms driving ecosystem dynamics.…”

Section: Discussionmentioning

confidence: 99%

Sea urchin Diadema africanum mass mortality in the subtropical eastern Atlantic: role of waterborne bacteria in a warming ocean

Clemente¹,

Lorenzo‐Morales²,

Mendoza³

et al. 2014

Mar. Ecol. Prog. Ser.

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Section: Discussionmentioning

confidence: 99%

Sea urchin Diadema africanum mass mortality in the subtropical eastern Atlantic: role of waterborne bacteria in a warming ocean

Clemente¹,

Lorenzo‐Morales²,

Mendoza³

et al. 2014

Mar. Ecol. Prog. Ser.

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“…Consequently, the structure and composition of macroalgae assemblages fluctuate both in time and space in response to the extreme conditions in the Persian Gulf (Chapman and Underwood 1998;Sangil et al 2011;John 2012). Understanding changes in their communities by detection and monitoring of local species, their distribution, and their availability is an indispensable part of a long term preservation and management of biodiversity in coastal waters (Trono 2003;Raffo et al 2014).…”

Section: Introductionmentioning

confidence: 99%

Zonation patterns, composition and diversity of macroalgal communities in the eastern coasts of Qeshm Island, Persian Gulf, Iran

et al. 2016

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This study investigates the spatial and temporal variation of intertidal macroalgae along the eastern coasts of Qeshm Island, Persian Gulf, Iran. Monthly sampling of abundance, biomass, richness and diversity of macroalgae at three intertidal levels was carried out at two different sites during 1 year. The samples were collected every month using quadrats (0.5 × 0.5 m) from October 2012 to September 2013. The species dry weight was applied to examine changes in biomass and assemblage composition of intertidal macroalgae using univariate and multivariate analyses. A total of 42 seaweed species (10 Chlorophyta, 9 Phaeophyceae, and 23 Rhodophyta) were identified. The results confirmed a temporal pattern in the growth of the algal species which also showed a biomass zonation pattern from upper to lower intertidal. The annual mean biomass of macroalgae was highest in winter (29.3 ± 9.8 g dry wt m−2 ) and the lowest in autumn (17.3 ± 13.5 g dry wt m−2 ). The annual dominant species by biomass was Padina sp. followed by Padina australis. The most common species in the area, during the sampling period include Ulva intestinalis, Ulva lactuca, Palisada perforata and Padina sp. According to the similarity percentages analysis (SIMPER), the species Ulva intestinalis, Dictyosphaeria cavernosa (Chlorophyta), Padina australis (Phaeophyceae), Champia spp., Centroceras clavulatum and Palisada perforata (Rhodophyta) were responsible for the most dissimilarity of species composition between four seasons during the sampling period. BIOENV analysis indicated that the main environmental factors structuring macroalgal community at the study area were TDS and pH. The simple macroalgae community on the eastern coast of Qeshm Island and absence of slow-growing perennial macroalgae, such as members of the Sargassaceae, known from the lower shore at other intertidal localities along the island's coast might relate to the predominantly unsuitable sandy-stony substrates unsuitable for their colonization and the unfavourable impact upon them of urbanization.

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“…A remarkable heterogeneity was observed in the shallow subtidal rocky bottom communities of the different sites, as shown by the average dissimilarities between the sites of the two islands in relation to the cover of macroalgal genera (see Table 4). Other studies on nearshore benthic communities have found that the distribution and abundance of benthic organisms can vary depending on the island habitat (VROOM et al, 2010), and additional studies have emphasized the influence of spatial scale on that variability (BENEDETTI-CECCHI, 2001;SANGIL et al, 2011). According to the literature, different physical and biological factors can shape the structure of macroalgal assemblages, including wave action (BUSTAMANTE; BRANCH, 1996), substratum heterogeneity, light availability (KENDRICK et al, 1999;TOOHEY et al, 2007), predation (MENGE;LUBCHENCO, 1981), competition (OLSON; LUBCHENCO, 1990) and facilitation (MENGE, 2000).…”

Section: Discussionmentioning

confidence: 99%

The Structure of Subtidal Macroalgal Assemblages at the Tamoios Ecological Station, a Threatened Conservation Unit in Rio De Janeiro, Brazil

2015

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The structure of subtidal rocky bottom communities at Tamoios Ecological Station (TES), situated in Ilha Grande Bay, Rio de Janeiro State, as well as in other Brazilian marine protected areas, is insufficiently characterized. The present study describes the macroalgal assemblages of shallow subtidal rocky bottoms on two islands of the TES-Imboassica (IM) and Búzios Pequena (BP)adopting species and genera as observational units. Two sites were surveyed on each island in summer 2011. Random 30x30 cm quadrats (n=3) were scraped to collect all macroalgae except crustose species. The subtidal assemblages, in which 58 macroalgal species occurred, were characterized by the high frequency and percent cover of Sargassum vulgare C. Agardh (56.8±8.4%). The sites differed significantly in total number of species and Shannon-Weiner diversity index (PERMANOVA, p<0.05). According to SIMPER, the macroalgal genera that most contributed to the dissimilarities of cover between the sites (contribution >5%) were Sargassum, Laurencia, Wrangelia, Canistrocarpus, Asparagopsis, Hypnea, Ceratodictyon, Gayliella, Spyridia and Chondria.Dissimilarities within and between the islands, as shown by nMDS of the cover data, suggest that different spatial scales should be considered in monitoring the rocky bottom communities of Ilha Grande Bay.

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Spatial variation patterns of subtidal seaweed assemblages along a subtropical oceanic archipelago: Thermal gradient vs herbivore pressure

Cited by 54 publications

References 43 publications

Sea urchin Diadema africanum mass mortality in the subtropical eastern Atlantic: role of waterborne bacteria in a warming ocean

Sea urchin Diadema africanum mass mortality in the subtropical eastern Atlantic: role of waterborne bacteria in a warming ocean

Zonation patterns, composition and diversity of macroalgal communities in the eastern coasts of Qeshm Island, Persian Gulf, Iran

The Structure of Subtidal Macroalgal Assemblages at the Tamoios Ecological Station, a Threatened Conservation Unit in Rio De Janeiro, Brazil

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