Analysis of the vegetation structure of a Sargassum community in the Philippines

Ang, Po

doi:10.3354/meps028009

Cited by 25 publications

(13 citation statements)

References 5 publications

(5 reference statements)

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“…Hence, dominance shifts from S. howeanum in shallow beds to a S. spinuligerum-decurrens assemblage in deep subtidal beds. Similar spatial distribution patterns have been described in Australia by Kendrick (1993), and in the Philippines by Ang (1986) but further investigations are needed to understand the factors that control species abundance within each bed.…”

Section: Spatial and Seasonal Variationsupporting

confidence: 63%

Diversity, biomass and distribution pattern of Sargassum beds in the South West lagoon of New Caledonia (South Pacific)

et al. 2008

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Sargassum (Phaeophyceae, Fucales) is a genus of worldwide distribution recently recognised to proliferate in several regions of the South Pacific. In New Caledonia, species of this genus naturally structure one of the major lagoon habitats but their extent, composition and biomass remain largely unknown. To fill these gaps in our knowledge over large areas, we applied a combination of remote sensing and in situ methods applied to the Neo Caledonian South West Lagoon. Space borne high resolution Landsat (30-m resolution) and Quickbird (2.4-m resolution) images of the Neo Caledonian South West lagoon were used to estimate the spatial extent of the different beds of interest. Species composition was determined for 11 Sargassum beds and seasonal variations were investigated for four representative beds over an 18 month period using quadrats and transects. Relationships between surface cover and biomass were estimated from seasonal field data sets. Finally, four methods requiring variable levels of sampling effort were designed to estimate the total biomass at the scale of each bed, considering (or not) the specific composition, and spatial and temporal variations. Seven Sargassaceae species were identified. Mean surface cover (24.4-51.6%) and total biomass [3.4-1,461.9 t dry matter (DM)] varied widely between beds. Overall, biomass temporal variations were not significantly different, but species-level variations seemed to be bed-specific. The extent of the 11 beds was 9 km 2 ; their total biomass was estimated and compared using each of the four methods, and the most precise method provided an estimate of 2,900 t DM. This study demonstrates a way of characterising Sargassum beds, efficiently and on a large scale, using a combination of remotely sensed and in situ data. These methods should be useful for possible future biomonitoring of Sargassum beds in New Caledonia, and in other areas worldwide.

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Section: Spatial and Seasonal Variationsupporting

confidence: 63%

Diversity, biomass and distribution pattern of Sargassum beds in the South West lagoon of New Caledonia (South Pacific)

et al. 2008

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“…The rationale for comparing those two periods is based on the assumption that environmental change may be manifested in the organism only after a change has occurred (Ang 1986).…”

Section: Methodsmentioning

confidence: 99%

Temporal and spatial variations in the structure of macroalgal communities associated with mangrove trees of Ilha do Cardoso, São Paulo state, Brazil

Yokoya¹,

Plastino²,

Braga³

et al. 1999

Rev. bras. Bot.

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-(Temporal and spatial variations in the structure of macroalgal communities associated with mangrove trees of Ilha do Cardoso, São Paulo state, Brazil). Temporal and spatial variations in species composition and vertical distribution of macroalgal communities growing on mangrove trees were analyzed bimonthly in the Ilha do Cardoso State Park, São Paulo state (25°03'S and 47°55'W), Southeastern Brazil. The macroalgal communities from mangroves of Perequê and Sítio Grande rivers comprised 10 and 18 taxa respectively. Bostrychia radicans (Mont.) Mont. and B. calliptera (Mont.) Mont. were the predominant taxa, present almost throughout the year and in all the sites studied. The species composition of macroalgal communities from both mangroves presented temporal and spatial variations related to environmental factors. The highest number of taxa was observed during colder, drier months, coinciding with the highest means of high water neap and short periods of continuous emersion (April to August). Some mangrove algae such as B. calliptera, Rhizoclonium spp., Caloglossa spp., and Boodleopsis pusilla (Collins) W. Taylor, Joly et Bernatowicz showed a high degree of tolerance to desiccation, being able to tolerate continuous emersion up to six days. The spatial variations in species composition were related to light, as observed in Catenella caespitosa (Withering) L. Irvine, which occurred in well-lit sites. No pattern of vertical zonation was observed, since Rhizoclonium spp., B. radicans, and B. calliptera occur over the entire vertical range. Variations in the range of vertical distribution of macroalgae of Perequê mangrove were mainly related to the variations in the tidal levels (mean high water neap and/or mean high water spring) while those observed in Sítio Grande mangrove were related to salinity variations, except for B. calliptera and Caloglossa spp. related to tidal levels and high irradiance, respectively.RESUMO -(Variações temporal e espacial na estrutura de comunidades de macroalgas associadas a árvores de manguezais na Ilha do Cardoso, estado de São Paulo, Brasil). A composição de espécies e a distribuição vertical das comunidades de macroalgas associadas às espécies arbóreas de manguezais do Parque Estadual da Ilha do Cardoso, estado de São Paulo (25°03'S e 47°55'W), Brasil, foram analisadas bimestralmente. As comunidades de macroalgas dos manguezais dos rios Perequê e Sítio Grande apresentaram 10 e 18 táxons, respectivamente. Bostrychia radicans (Mont.) Mont. e B. calliptera (Mont.) Mont. foram os táxons predominantes, presentes durante quase todo o ano e em todos os locais estudados. A composição em espécies das comunidades de macroalgas dos dois manguezais apresentaram variações temporal e espacial relacionadas aos fatores ambientais. O maior número de táxons foi observado durante os meses mais frios e secos, coincidentes com as maiores médias das marés de quadratura e curtos períodos de emersão (abril a agosto). Algumas macroalgas, tais como B. calliptera, Rhizoclonium spp., Caloglossa spp.,...

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“…The distribution and population structure of Sargassum species is influenced by water temperature, especially antecedent events in minimum and maximum values (Ang 1986, Glenn et al 1990, tidal levels and water movement (Ang 1986), substrate type (McCook 1999), propagule dispersal and recruitment (Hales & Fletcher 1990, Kendrick & Walker 1991, and herbivory (Wanders 1976, McCook 1996. Most tropical Indo-Pacific species of Sargassum reach peak abundance and reproduce during the cooler months of the year (e.g.…”

Section: Introductionmentioning

confidence: 99%

Seasonal dynamics of Sargassum ilicifolium (Phaeophyta) on a shallow reef flat in the southern Red Sea (Eritrea)

Ateweberhan¹,

Bruggemann²,

Breeman³

2005

Mar. Ecol. Prog. Ser.

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The seasonality of Sargassum ilicifolium was studied in the southern Red Sea by monitoring thallus density, thallus size and the initiation, growth, reproduction and survivorship of primary laterals. Thallus density showed slight but significant seasonal variation; it was highest at the end of the hot season and lowest at the end of the cold season. Mean thallus and lateral lengths peaked in the second half of the cold season. Initiation of new laterals was highest in the first half of the cold season. High lateral densities suppressed new lateral initiation. In the first month after initiation, laterals grew out to the same length as those formed earlier in the year. Thus, elongation rates of young laterals were highest during the period of maximum canopy height. In older laterals, growth rates decreased with length, due to increased tissue loss. Growth rates were independent of reproductive status. Reproduction occurred in the second half of the cold season and was independent of lateral size, but laterals had to be at least 1 to 2 mo old before reproducing. Highest loss rates of laterals occurred at the end of the growth season. Survivorship was independent of lateral size or reproductive status. Loss rates were lowest in the hot season. We conclude that there is no direct trade-off between reproduction and growth/survival of the laterals, and that the dynamics of S. ilicifolium are directly related to the seasonal extremes in environmental conditions. Morphogenetic responses at the level of individual laterals also contribute to the overall phenological pattern.

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Analysis of the vegetation structure of a Sargassum community in the Philippines

Cited by 25 publications

References 5 publications

Diversity, biomass and distribution pattern of Sargassum beds in the South West lagoon of New Caledonia (South Pacific)

Diversity, biomass and distribution pattern of Sargassum beds in the South West lagoon of New Caledonia (South Pacific)

Temporal and spatial variations in the structure of macroalgal communities associated with mangrove trees of Ilha do Cardoso, São Paulo state, Brazil

Seasonal dynamics of Sargassum ilicifolium (Phaeophyta) on a shallow reef flat in the southern Red Sea (Eritrea)

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