The marine algal flora of Angola: its distribution and affinities

Lawson, George; John, David M.; Price, James H.

doi:10.1111/j.1095-8339.1975.tb01652.x

Cited by 21 publications

(98 citation statements)

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“…In contrast, do not make any comment relative to Euhymenia schizophylla nor Kallymenia dentata in their work about the seaweeds of the South African west coast. We hold that the taxonomy of Euhymenia schizophylla should be clarified and its presence in Namibia confirmed before to include it in the catalogue.(30) Only recorded from Diaz Point by Engledow (1998).(31) Recorded as Gymnogongrus complicatus (Kützing) Papenfuss by Lawson et al (1990). Among our material there are specimens morphologically very similar to this taxon, but having nemathecia instead of cystocarps.…”

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confidence: 89%

“…According to these last authors, P. cornea occurs from East London (South African east coast) to Cape Frio (Namibia). However, Lawson et al (1990) do not take into account this species in their list of marine algae of Namibia.(18) This species includes A. setchellii Manza (Seagrief, 1984).(19) Recorded from Swakopmund by Wynne (1986). This author points out that the material is reminiscent of the genus Arthrocardia, but Dr. H. W. Johansen identified it as Corallina sp.…”

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confidence: 99%

“…This author points out that the material is reminiscent of the genus Arthrocardia, but Dr. H. W. Johansen identified it as Corallina sp. These specimens are deposited in the MICH Herbarium (Wynne 7541).(20) Chamberlain and Keats (1994) include Namibia in the distribution of this species, but they do not mention any locality nor refer to any other work.(21) Chamberlain and Keats (1995) include Namibia in the world distribution of M. engelhartii, but they do not mention any locality nor refer to any other work.(22) Chamberlain (1994) includes Namibia in the distribution of this species, but he do not mention any locality nor refer to any other work.(23) Recorded as Gigartina teedii (Roth) Lamouroux in Lawson et al (1990). According to Silva et al (1996) the correct epithet for this species is teedei.…”

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confidence: 99%

“…Lawson et al (1990) report Walvis Bay as the single locality in Namibia where the plant occurs and they refer to that work. remark the possibility that this species was a synonym of Mazzaella capensis.(25) Recorded as Gigartina radula (Esper) J. Agardh by Lawson et al (1990). See the remark at page 74.…”

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confidence: 99%

“…For this reason, we have assigned them to the genus Gymnogongrus without specifying the species. See the remark at page 89.(32) Recorded as Gymnogongrus glomeratus J. Agardh by Lawson et al (1990). This species includes Gymnogongrus corymbosus J. Agardh .…”

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Marine benthic algae of Namibia

Lluch

2002

Sci. Mar.

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SUMMARY: The first comprehensive study of the marine algal flora of Namibia including descriptions and illustrations of most species is presented. The main objective of this work is to report a flora that, until now, has scarcely been studied. The work compiles all the available information on the marine benthic flora of Namibia and provides new data about it composition and biogeography, as well as detailed descriptions and remarks of most of its species. The samples on which this study is based were collected between 1986 and 1989 in the eulittoral and the upper sublittoral zones of the north half of the Namibian coast. According to the present data, the marine benthic flora of Namibia comprises 196 taxa (147 Rhodophyceae, 20 Phaeophyceae, 15 Ulvophyceae, 6 Cladophorophyceae and 8 Bryopsidophyceae), 21 of which has not been recorded from this coasts. This temperate flora is mainly characterized by a low number of species, a low proportion of Phaeophyceae and a high degree of endemism. Concerning the species number, the flora is quite poor due to both the scarce availability of colonizable substratum and the low diversity of habitats. On the other hand, the low proportion of Phaeophyceae is the reason for which the R/P and (R+C)/P ratios take disproportionately high values and so they are not useful in this geographical area. As regards the degree of endemism, the marine benthic flora of Namibia includes quite a high number of taxa endemic to southern Africa (55 taxa; 28.1% of the flora); 25 of these 55 taxa (12.8% of the flora) are endemic to the biogeographic Benguela Marine Province and only Acrosorium cincinnatum is endemic to the Namibian coasts.Key words: Namibia, marine algae, morphology and anatomy, distribution, biogeography, taxonomy, check-list. RESUMEN: ALGAS BENTÓNICAS MARINAS DE NAMIBIA. -Este trabajo recoge toda la información existente hasta el momento sobre la flora bentónica marina de Namibia y proporciona nuevos datos sobre su composición y biogeografía, además de descripciones detalladas y valoraciones críticas de muchas de sus especies. El trabajo se ha realizado a partir de muestras florísticas recolectadas entre los años 1986 y 1989 en las zonas eulitoral y sublitoral superior de la costa de la mitad norte del país, entre Walvis Bay y la desembocadura del río Kunene. Según los datos actuales, la flora bentónica marina de Namibia está representada por 196 táxones (147 Rhodophyceae, 20 Phaeophyceae, 15 Ulvophyceae, 6 Cladophorophyceae y 8 Bryopsidophyceae), 21 de los cuales no habían sido citados hasta el momento de las costas de este país. Se trata de una flora de carácter templado que se caracteriza principalmente por el bajo número de especies, la escasa proporción de feofíceas y el elevado grado de endemismo. En cuanto al número de especies, la flora de Namibia es relativamente pobre, debido a la escasa disponibilidad de substrato colonizable y a la baja diversidad de hábitats. Por otra parte, la baja proporción de feofí-ceas hace que los índices R/P y (R+C)/P adopten valores desproporc...

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confidence: 89%

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confidence: 99%

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confidence: 99%

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confidence: 99%

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confidence: 99%

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Marine benthic algae of Namibia

Lluch

2002

Sci. Mar.

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Marine Biodiversity of Angola: Biogeography and Conservation

Kirkman¹,

Nsingi²

2019

Biodiversity of Angola

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Some major physical and oceanographic features of the Angolan marine system include a narrow continental shelf, the warm, southward flowing Angola Current, the plume of the Congo River in the north and the Angola-Benguela Front in the south. Depth, substrate types and latitude have been shown to account for species differences in demersal faunal assemblages including fish, crustaceans, and cephalopods. The extremely narrow shelf between Tômbwa (15°48′S) and Benguela (12°33′S) may serve as a barrier for the spreading of shelf-occurring species between the far south, which is influenced by the Angola-Benguela Front, and the equatorial waters of the central and northern areas. A similar pattern is evident for coastal and shallow-water species, including fishes, intertidal invertebrates and seaweeds, with species that have temperate affinities found in the far south and tropical species further to the north. In general the fauna and flora of the littoral zone appears to be consistent with a pattern of relatively low diversity of the shore and near-shore areas, that is characteristic of West Africa, but paucity of data for Angola may make such comparisons of diversity with other areas inappropriate at this stage. The Congo River delta and many features that are interspersed along the coast such as estuaries and associated floodplains, wetlands, lagoons, salt marshes and mangroves, support a rich suite of species, many of which are rare, endemic, migratory, and/or threatened, and provide important ecosystem services. While the ecological value of many areas or features is recognised, lack of any legal protection in the form of marine protected areas (MPAs) has been identified as one of the main challenges facing conservation and sustainable use of Angola's marine and coastal biodiversity and habitats, in the face of multiple threats. A current process to identify and describe ecologically or biologically significant marine areas (EBSAs) could provide a foundation for designating some MPAs in future.

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The Flora of Angola: Collectors, Richness and Endemism

Goyder

Gonçalves

2019

Biodiversity of Angola

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Angola is botanically rich and floristically diverse, but is still very unevenly explored with very few collections from the eastern half of the country. We present an overview of historical and current botanical activity in Angola, and point to some areas of future research. Approximately 6850 species are native to Angola and the level of endemism is around 14.8%. An additional 230 naturalised species have been recorded, four of which are regarded as highly invasive. We draw attention to the paucity of IUCN Red List assessments of extinction risk for Angolan vascular plants and note that the endemic aquatic genus Angolaea (Podostemaceae), not currently assessed, is at high risk of extinction as a result of dams built on the Cuanza river for hydroelectric power generation. Recent initiatives to document areas of high conservation concern have added many new country and provincial records and are starting to fill geographic gaps in collections coverage.

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The marine algal flora of Angola: its distribution and affinities

Cited by 21 publications

References 2 publications

Marine benthic algae of Namibia

Marine benthic algae of Namibia

Marine Biodiversity of Angola: Biogeography and Conservation

The Flora of Angola: Collectors, Richness and Endemism

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