A comparison of epiphytic diatom communities on Plocamium cartilagineum (Plocamiales, Florideophyceae) from two Antarctic areas

Majewska, Roksana; Kukliński, Piotr; Bałazy, Piotr; Yokoya, Nair S.; Martins, Aline P.; Stefano, Mario De

doi:10.1007/s00300-014-1578-7

Cited by 13 publications

(33 citation statements)

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“…As reported by Majewska et al . [ 29 , 30 , 31 ], epiphytic diatom communities from the Southern Ocean may differ substantially between geographic locations and seasons. Nevertheless, we believe that at least some of the differences in the number of diatom taxa detected were underlain by the differences in methodology used.…”

Section: Discussionmentioning

confidence: 99%

“…Thalli of three common macroalgal species ( Iridaea cordata , Phyllophora antarctica , Plocamium cartilagineum ) were collected by SCUBA divers from regularly used sampling locations: Tethys Bay (74°41.923'S, 164°01.670'E), Molo (74°54.187'S, 163°55.185'E), Faraglione (74°43.048'S; 164°06.425'E), Adélie Cove (74°46.470'S, 163°59.328'E), Cape Russell (74°41.393'S, 164°6.946'E) [ 29 , 30 , 31 ], and Cape Evans (77°38.066'S, 166°24.847'E; Fig 1 ; Table 1 ).…”

Section: Methodsmentioning

confidence: 99%

“…This study builds on the results of a recent survey of marine epiphytic diatoms from the Ross Sea [ 28 , 29 , 30 , 31 ]. We focus on epiphytic diatoms from Terra Nova Bay and Cape Evans (McMurdo Sound; Fig 1 ) examining material obtained during 11 summer Antarctic expeditions to these locations in the seasons 1989/90–2011/12.…”

Section: Introductionmentioning

confidence: 99%

“…Biological, physical and chemical factors may regulate abundance, distribution and species composition of diatom communities associated with marine macroalgae. Amongst these, host macroalgal morphology, sampling site location and depth, grazing pressure, stage of season and ice formation and thaw have been identified as important factors influencing the shallow water communities [ 28 , 29 , 30 , 31 , 32 , 33 ]. Reliable description of basibiont-epibiont-environment interactions is difficult as some of the factors involved are as yet unknown, while the environmental parameters likely to control Antarctic diatom development are strongly and dynamically interrelated.…”

Section: Introductionmentioning

confidence: 99%

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Summer Epiphytic Diatoms from Terra Nova Bay and Cape Evans (Ross Sea, Antarctica) - A Synthesis and Final Conclusions

2016

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Despite recent advances in polar marine biology and related fields, many aspects of the ecological interactions that are crucial for the functioning of Antarctic shallow water habitats remain poorly understood. Although epiphytic diatoms play an essential role in the Antarctic marine food web, basic information regarding their ecology, biodiversity and biogeography is largely unavailable. Here, we synthesise studies on Ross Sea epiphytic diatoms collected during 11 summer Antarctic expeditions between the years 1989/90 and 2011/12, presenting a full list of diatom taxa associated with three macroalgal species (Iridaea cordata, Phyllophora antarctica, and Plocamium cartilagineum) and their epiphytic sessile fauna. Diatom communities found during the three summer months at various depths and sampling stations differed significantly in terms of species composition, growth form structure and abundances. Densities ranged from 21 to >8000 cells mm-2, and were significantly higher on the surface of epiphytic micro-fauna than on any of the macroalgal species examined. Generally, host organisms characterized by higher morphological heterogeneity (sessile microfauna, ramified Plocamium) supported richer diatom communities than those with more uniform surfaces (Iridaea). Differences between epiphytic communities associated with different macroalgae were reflected better in species composition than in growth form structure. The latter changed significantly with season, which was related strongly to the changing ice conditions. A general trend towards an increasing number of erect forms in deeper waters and tube-dwelling diatoms in the shallowest sites (2–5 m) was also observed. This study explores further important and largely previously unknown aspects of relationships and interactions between Antarctic epiphytic diatoms and their micro- and macro-environments.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Summer Epiphytic Diatoms from Terra Nova Bay and Cape Evans (Ross Sea, Antarctica) - A Synthesis and Final Conclusions

2016

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“…After ca. 24h, the preserved fragments were dehydrated in an alcohol series, critical-point-dried, and mounted on aluminium stubs following the method described in Majewska et al (2015).…”

Section: Methodsmentioning

confidence: 99%

Nagumoea serrata, a new diatom species (Bacillariophyceae) found on seagrass from the south-eastern coast of Africa (Indian Ocean)

Majewska¹,

Vijver²

2020

Fottea

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A novel diatom species belonging to the genus Nagumoea is described based on detailed light and scanning electron microscopy observations. The new taxon was found abundantly in several samples collected from seagrass on the southernmost coasts of Mozambique, Southern Africa. While the new species shows characters (e.g. scalariform valvocopula, fibulae of complex shape and structure) consistent with the genus description, it differs distinctly from currently known members of Nagumoea. Differences include generally larger (7-29 µm) and more slender (1.0-1.5 µm) valves with acutely rounded apices and 4-5 areolae per stria, a doubly-perforated valvocopula, and the last-formed copula with a highly regular serrated margin. Based on the current knowledge and understanding of the diatom morphology and phylogeny, Anaulus vallus Nikolaev, previously included within the genus Denticula, is transferred to the genus Nagumoea. This brings the current number of the genus members to five. Ecological preferences of Nagumoea are briefly discussed.

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Shared Epizoic Taxa and Differences in Diatom Community Structure Between Green Turtles (Chelonia mydas) from Distant Habitats

et al. 2017

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The first reports of diatoms growing on marine mammals date back to the early 1900s. However, only recently has direct evidence been provided for similar associations between diatoms and sea turtles. We present a comparison of diatom communities inhabiting carapaces of green turtles Chelonia mydas sampled at two remote sites located within the Indian (Iran) and Atlantic (Costa Rica) Ocean basins. Diatom observations and counts were carried out using scanning electron microscopy. Techniques involving critical point drying enabled observations of diatoms and other microepibionts still attached to sea turtle carapace and revealed specific aspects of the epizoic community structure. Species-poor, well-developed diatom communities were found on all examined sea turtles. Significant differences between the two host sea turtle populations were observed in terms of diatom abundance and their community structure (including growth form structure). A total of 12 and 22 diatom taxa were found from sea turtles in Iran and Costa Rica, respectively, and eight of these species belonging to Amphora, Chelonicola, Cocconeis, Navicula, Nitzschia and Poulinea genera were observed in samples from both locations. Potential mechanisms of diatom dispersal and the influence of the external environment, sea turtle behaviour, its life stage, and foraging and breeding habitats, as well as epibiotic bacterial flora on epizoic communities, are discussed.

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A comparison of epiphytic diatom communities on Plocamium cartilagineum (Plocamiales, Florideophyceae) from two Antarctic areas

Cited by 13 publications

References 70 publications

Summer Epiphytic Diatoms from Terra Nova Bay and Cape Evans (Ross Sea, Antarctica) - A Synthesis and Final Conclusions

Summer Epiphytic Diatoms from Terra Nova Bay and Cape Evans (Ross Sea, Antarctica) - A Synthesis and Final Conclusions

Nagumoea serrata, a new diatom species (Bacillariophyceae) found on seagrass from the south-eastern coast of Africa (Indian Ocean)

Shared Epizoic Taxa and Differences in Diatom Community Structure Between Green Turtles (Chelonia mydas) from Distant Habitats

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