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Authors = Do Cong Thung

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12 pages, 3592 KiB  
Article
Sponge Spicules in Sediments: A Proxy for Past and Present Sponge Fauna Assessment in Ha Long Bay (Vietnam)
by Anna Reboa, Barbara Calcinai, Carlo Cerrano, Eleonora Turvano, Giorgio Bavestrello, Do Cong Thung and Marco Bertolino
J. Mar. Sci. Eng. 2024, 12(12), 2162; https://doi.org/10.3390/jmse12122162 - 27 Nov 2024
Viewed by 1296
Abstract
The study of cryptic sponges can be challenging, as they are difficult to detect in the environment without the use of destructive methods. The permanence of mineral skeletal components of Porifera in sediments is therefore a tool that can provide support for a [...] Read more.
The study of cryptic sponges can be challenging, as they are difficult to detect in the environment without the use of destructive methods. The permanence of mineral skeletal components of Porifera in sediments is therefore a tool that can provide support for a more comprehensive study of sponge fauna. In this context, sediments collected from four karst lakes in Ha Long Bay (Vietnam), plus two surrounding sea areas, were processed to extract spicules belonging to sponges with siliceous skeletons. From the morphology of the spicules, it was possible to trace the taxa of the sponges present in the area at that time or earlier. It was found that each lake had a sponge fauna composition characterized by different families and genera. Moreover, sponge taxa identified in the surrounding sea areas differed significantly from the ones inside of the neighboring lakes. In addition, it was possible to identify the presence of four sponge genera not yet recorded in the South China Sea area. Thus, the study of spicules trapped in sediments proved to be a useful tool for a comprehensive study of sponge fauna. Full article
(This article belongs to the Special Issue 5th International Workshop on Taxonomy of Atlanto-Mediterranean Deep-Sea & Cave Sponges)
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21 pages, 2672 KiB  
Article
New Insight into the Genus Cladocroce (Porifera, Demospongiae) Based on Morphological and Molecular Data, with the Description of Two New Species
by Marco Bertolino, Carlo Cerrano, Giorgio Bavestrello, Do Cong Thung, Laura Núñez-Pons, Francesca Rispo, Jana Efremova, Valerio Mazzella, Daisy Monica Makapedua and Barbara Calcinai
J. Mar. Sci. Eng. 2023, 11(6), 1240; https://doi.org/10.3390/jmse11061240 - 16 Jun 2023
Cited by 1 | Viewed by 19693
Abstract
During scientific expeditions in Indonesia and Vietnam, several sponge specimens belonging to the genus Cladocroce were collected. The integration of morphological and molecular analyses, incorporating species delimitation models (ABGD, ASAP, and bPTP) and phylogenetic approaches using three molecular markers (COI, 28S, and 18S–ITS1–5.8S–ITS2–28S), [...] Read more.
During scientific expeditions in Indonesia and Vietnam, several sponge specimens belonging to the genus Cladocroce were collected. The integration of morphological and molecular analyses, incorporating species delimitation models (ABGD, ASAP, and bPTP) and phylogenetic approaches using three molecular markers (COI, 28S, and 18S–ITS1–5.8S–ITS2–28S), allowed us to discriminate three congeneric species. Two of these species (C. burapha and C. pansinii sp. nov.) were supported by morphological and molecular data, whereas a third species (C. lamellata sp. nov.) was delimited by morphological data only. We formally describe two new species, C. pansinii sp. nov. and C. lamellata sp. nov. C. aculeata is a newly recorded species for Indonesia and the first documented finding after the original description. The re-examination of the type material of C. burapha, and indirectly the molecular approach, allowed us to confirm that C. burapha lives in sympatry with C. pansinii sp. nov. in Vietnam and with C. lamellata in Indonesia. Thanks to these findings, we relocated the paratype of C. burapha to the new species described here, i.e., C. pansinii sp. nov. Full article
(This article belongs to the Special Issue The 10th Anniversary of JMSE - Recent Advances in Section Marine Biology)
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14 pages, 4959 KiB  
Article
A New Species of Spongilla (Porifera, Demospongiae) from a Karst Lake in Ha Long Bay (Vietnam)
by Barbara Calcinai, Carlo Cerrano, Laura Núñez-Pons, Maurizio Pansini, Do Cong Thung and Marco Bertolino
J. Mar. Sci. Eng. 2020, 8(12), 1008; https://doi.org/10.3390/jmse8121008 - 9 Dec 2020
Cited by 8 | Viewed by 4410
Abstract
Cahong in Ha Long Bay (Vietnam) is a small lake with a reduced, invisible connection with the open sea. The water column conditions locally experience notable fluctuations across the year, mostly driven by biannual monsoon seasons. Salinity, temperature, and pH often reach extreme [...] Read more.
Cahong in Ha Long Bay (Vietnam) is a small lake with a reduced, invisible connection with the open sea. The water column conditions locally experience notable fluctuations across the year, mostly driven by biannual monsoon seasons. Salinity, temperature, and pH often reach extreme values, unsustainable for the majority of the marine fauna. Therefore, the biodiversity of the benthic macrofauna in this peculiar habitat is remarkably low. In particular, a single sponge species new to science was found solely populating this characteristic brackish lake during our last survey in August 2018. Spongilla manconiae sp. nov. is a new Porifera species described here. It belongs to an exclusively freshwater taxon and seems to have acquired adaptive traits to tolerate extreme peaks of temperature and salinity. The mitochondrial Cytochrome C Oxidase subunit 1 (COI) and the nuclear Internal Transcribed Spacers 1 and 2 (ITSs) gene markers were used for barcoding tagging and phylogenetic analyses. The new species revealed large genetic distances and separate clustering in the tree topology, with respect to other reference spongillid sequences from various geographic areas. The study provides evidence for an urgency to protect these unique marine lake systems because they represent rare, fluctuant, fragile habitats that may speed up speciation processes. Full article
(This article belongs to the Special Issue Benthic Species and Habitats)
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