Catenula exigua sp. nov., a new marine diatom (Bacillariophyta) species from the Adriatic Sea

Robert, Käthe; Bosak, Sunčica; Vijver, Bart Van de

doi:10.11646/phytotaxa.414.2.3

Cited by 7 publications

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“…Despite the high taxon richness, the percentage of the presumably truly epizoic taxa is rather low, although, we cannot be certain of an exact number of taxa that belong to that group. Several taxa were recently described from loggerhead samples from this dataset such as Catenula exigua K.Robert et al, Planothidium kaetherobertianum Van de Vijver & Bosak, and Lucanicum ashworthianum Majewska et al [21,43,44]. These taxa have not yet been found in epizoic samples from other localities and substrata.…”

Section: Plos Onementioning

confidence: 84%

Geographical variation in the diatom communities associated with loggerhead sea turtles (Caretta caretta)

et al. 2020

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Epizoic diatoms form an important part of micro-epibiota of marine vertebrates such as whales and sea turtles. The present study explores and compares the diversity and biogeography of diatom communities growing on the skin and shell of loggerhead sea turtles (Caretta caretta) from four different localities: Adriatic Sea (Croatia), Ionian Sea (Greece), South Africa and Florida Bay (USA) using both light and scanning electron microscopy. We observed almost 400 diatom taxa belonging to more than 100 genera. Diatom communities from Greece and Croatia showed the highest similarity and were statistically different from those recorded from South Africa and Florida. Part of this variation could be attributed to differences in sampling techniques; however, we believe that geography had an important role. In general, contrary to several previous observations from sea turtles, the presumably exclusively epizoic diatoms contributed less than common benthic taxa to the total diatom flora, which might have been related to the loggerhead feeding behavior. Moreover, skin samples differed from carapace samples in having a distinct diatom composition with a higher proportion of the putative true epizoonts. Our results indicate that epizoic diatom communities differ according to loggerhead geographical location and substrate (skin vs. carapace). The relative abundances of common benthic diatoms and putative exclusive epizoic taxa may inform about sea turtle habitat use or behavior though detailed comparisons among different host species have yet to be performed.

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Section: Plos Onementioning

confidence: 84%

Geographical variation in the diatom communities associated with loggerhead sea turtles (Caretta caretta)

et al. 2020

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“…Analyses of the diatom flora on the carapace of other Adriatic turtles revealed a different epibiont diatom community (unpublished data). The flora on Žanja-Mara proved to be composed of other unique taxa such as Catenula exigua, Planothidium kaetherobertianum and an unknown Bifibulatia species, all taxa never observed on other Adriatic turtles (Robert et al 2019; Van de Vijver & Bosak 2019). However, the diatom survey of the Adriatic turtle flora only recently started and only a limited number of turtle samples has been analysed so far making undersampling and underreporting likely causes for the lack of distribution data of Majewskaea.…”

Section: Discussionmentioning

confidence: 98%

“…Recently, during a survey of the epizoic diatom flora living on loggerhead sea turtles from the Adriatic Sea, a new Catenula, C. exigua Robert et al and a Planothidium species P. kaetherobertianum Van de Vijver et al were described from the turtle carapace (Robert et al 2019; Van de Vijver & Bosak 2019).On the same turtle, a relatively large population of a small monoraphid taxon was observed showing some resemblance to several established achnanthoid genera but also presenting important morphological differences placing the unknown species in one of these genera less probable. When the catch-all genus Achnanthes Bory sensu lato proved to be too heterogenous, it was gradually split up starting in 1990 by Round et al with the re-erection of Eucocconeis Cleve ex Meister and Achnanthidium Kützing.…”

Section: Introductionmentioning

confidence: 99%

Majewskaea gen. nov. (Bacillariophyta), a new marine benthic diatom genus from the Adriatic Sea

Vijver¹,

Robert²,

Witkowski³

et al. 2020

Fottea

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During a survey of the diatom flora attached to carapaces of loggerhead sea turtles (Caretta caretta) from the Adriatic Sea, a large population of an unknown marine achnanthoid species was observed that could not be assigned to any of the currently described monoraphid diatom genera. Detailed morphological analysis based on scanning electron microscopy observations and comparison with a large number of monoraphid genera such as Madinithidium, Scalariella, Kolbesia and Karayevia, resulted in the description of the new benthic marine genus Majewskaea gen. nov. with the newly described Majewskaea istriaca sp. nov. as generitype. The new genus is characterized by a sternum valve showing a clear recurving ridge surrounding the entire valve margin, the presence of macroareolae closed internally by perforated hymenes, separated by a longitudinal hyaline area, a well-developed sternum and vestigial raphe slits. The raphe valve has a simple straight raphe with bent terminal fissures, a very fine striation pattern composed of macroareolae cut in two by a longitudinal hyaline zone, and a very shallow mantle. The new genus is illustrated using both LM and SEM observations and compared with other resembling marine and brackish Planothidium monoraphid species.

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“…Recently, diatoms associated with the Mediterranean loggerhead sea turtle population have been described. These included an Olifantiella species ( Kaleli et al, 2018 ) and six new species of Proschkinia ( Majewska et al, 2019 ), and a small celled Catenula taxon from the Adriatic Sea ( Robert, Bosak & Van de Vijver, 2019 ).…”

Section: Introductionmentioning

confidence: 99%

Biodiversity of carapace epibiont diatoms in loggerhead sea turtles (Caretta caretta Linnaeus 1758) in the Aegean Sea Turkish coast

Kaleli

Car

Witkowski

et al. 2020

PeerJ

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Background The Aegean Sea coast of Turkey hosts one of the most important nesting grounds for loggerhead sea turtles (Caretta caretta) in the Mediterranean Sea. Previous studies have revealed that the sea turtle carapace provides favourable conditions for various epibiontic organisms. Epibionts occurring on the carapace have been examined from different locations in the oceans. Methods This is the first time such a high number (39) of samples collected from nesting turtles during such a long time period (extending from 2011 to 2018) has been used for the study of the diatom component of the microbiome on the turtle carapaces. A total of 33 samples were investigated in terms of light microscopy (LM) and scanning electron microscopy (SEM). Six unprocessed biofilm fragments were subject to SEM observations. Results A total of 457 epizoic diatom taxa belonging to 86 genera were identified. Epizoic forms, e.g., Achnanthes spp., Chelonicola spp. or Tripterion spp. (also identified by SEM observations of the undisturbed pieces of the microbiome) dominated in terms of relative abundance, but the highest numbers of taxa were ubiquitously represented by Navicula (79), Nitzschia (45), Amphora (40), Cocconeis (32), Diploneis (25) and Mastogloia (23). Navicula perminuta and Delphineis australis were the most frequent taxa, present in 65% of the samples, both with an average relative abundance of 10%. The results of our study revealed that diatoms are an essential component of the loggerhead sea turtles’ microbiome, in terms of high biodiversity and abundance. Although strict epibionts provide a signature of the turtle microbiome, the carapace as a solid substrate attracts numerous benthic diatom species which are considered opportunistic forms and can be found in the surrounding benthic habitats of the vast ocean littoral space.

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Catenula exigua sp. nov., a new marine diatom (Bacillariophyta) species from the Adriatic Sea

Cited by 7 publications

References 0 publications

Geographical variation in the diatom communities associated with loggerhead sea turtles (Caretta caretta)

Geographical variation in the diatom communities associated with loggerhead sea turtles (Caretta caretta)

Majewskaea gen. nov. (Bacillariophyta), a new marine benthic diatom genus from the Adriatic Sea

Biodiversity of carapace epibiont diatoms in loggerhead sea turtles (Caretta caretta Linnaeus 1758) in the Aegean Sea Turkish coast

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