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Six marine thecate Heterocapsa (Dinophyceae) from Malaysia, including the description of three novel species and their cytotoxicity potential

Thirty-four strains of Heterocapsa were established from Malaysian waters and their morphologies were exam-ined by light, scanning, and transmission electron microscopy. Three species, H. bohaiensis, H. huensis, and H. rotundata, and three new species, H. borneoensis sp. nov., H. limii sp. nov., and...

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Main Authors: Hanifah, Afiqah Hamilton, Teng, Sing Tung, Law, Ing Kuo, Abdullah, Nursyahida, Chiba, Sheryl Uncha Andrew, Lum, Wai Mun, Tillmann, Urban, Lim, Po Teen, Leaw, Chui Pin
Format: Article
Published: ELSEVIER 2022
Subjects:
S Agriculture (General)
Online Access:http://eprints.um.edu.my/46175/
https://doi.org/10.1016/j.hal.2022.102338
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spelling my.um.eprints.461752024-10-25T07:58:24Z http://eprints.um.edu.my/46175/ Six marine thecate Heterocapsa (Dinophyceae) from Malaysia, including the description of three novel species and their cytotoxicity potential Hanifah, Afiqah Hamilton Teng, Sing Tung Law, Ing Kuo Abdullah, Nursyahida Chiba, Sheryl Uncha Andrew Lum, Wai Mun Tillmann, Urban Lim, Po Teen Leaw, Chui Pin S Agriculture (General) Thirty-four strains of Heterocapsa were established from Malaysian waters and their morphologies were exam-ined by light, scanning, and transmission electron microscopy. Three species, H. bohaiensis, H. huensis, and H. rotundata, and three new species, H. borneoensis sp. nov., H. limii sp. nov., and H. iwatakii sp. nov. were described in this study. The three species were differentiated morphologically by unique characteristics of cell size, shape, displacement of the cingulum, shape and position of nucleus, the number and position of pyrenoids, and body scale ultrastructure. The species delimitations were robustly supported by the molecular data. A light-microscopy-based key to species of Heterocapsa is established, with two major groups, i.e., species with a single pyrenoid, and species with multiple pyrenoids. Bioassays were conducted by exposing Artemia nauplii to Het-erocapsa densities of 1-5 x 105 cells mL-1, and treatments exposed to H. borneoensis showed naupliar mortality, while no naupliar death was observed in the treatments exposed to cells of H. bohaiensis, H. huensis, H. limii, and H. iwatakii. Naupliar death was observed during the initial 24 h for both tested H. borneoensis strains, and mortality rates increased up to 50% after 72-h exposure. This study documented for the first time the diversity and cytotoxic potency of Heterocapsa species from Malaysian waters. ELSEVIER 2022-12 Article PeerReviewed Hanifah, Afiqah Hamilton and Teng, Sing Tung and Law, Ing Kuo and Abdullah, Nursyahida and Chiba, Sheryl Uncha Andrew and Lum, Wai Mun and Tillmann, Urban and Lim, Po Teen and Leaw, Chui Pin (2022) Six marine thecate Heterocapsa (Dinophyceae) from Malaysia, including the description of three novel species and their cytotoxicity potential. HARMFUL ALGAE, 120. ISSN 1878-1470, DOI https://doi.org/10.1016/j.hal.2022.102338 <https://doi.org/10.1016/j.hal.2022.102338>. https://doi.org/10.1016/j.hal.2022.102338 10.1016/j.hal.2022.102338
institution Universiti Malaya
building UM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Malaya
content_source UM Research Repository
url_provider http://eprints.um.edu.my/
topic S Agriculture (General)
spellingShingle S Agriculture (General)
Hanifah, Afiqah Hamilton
Teng, Sing Tung
Law, Ing Kuo
Abdullah, Nursyahida
Chiba, Sheryl Uncha Andrew
Lum, Wai Mun
Tillmann, Urban
Lim, Po Teen
Leaw, Chui Pin
Six marine thecate Heterocapsa (Dinophyceae) from Malaysia, including the description of three novel species and their cytotoxicity potential
description Thirty-four strains of Heterocapsa were established from Malaysian waters and their morphologies were exam-ined by light, scanning, and transmission electron microscopy. Three species, H. bohaiensis, H. huensis, and H. rotundata, and three new species, H. borneoensis sp. nov., H. limii sp. nov., and H. iwatakii sp. nov. were described in this study. The three species were differentiated morphologically by unique characteristics of cell size, shape, displacement of the cingulum, shape and position of nucleus, the number and position of pyrenoids, and body scale ultrastructure. The species delimitations were robustly supported by the molecular data. A light-microscopy-based key to species of Heterocapsa is established, with two major groups, i.e., species with a single pyrenoid, and species with multiple pyrenoids. Bioassays were conducted by exposing Artemia nauplii to Het-erocapsa densities of 1-5 x 105 cells mL-1, and treatments exposed to H. borneoensis showed naupliar mortality, while no naupliar death was observed in the treatments exposed to cells of H. bohaiensis, H. huensis, H. limii, and H. iwatakii. Naupliar death was observed during the initial 24 h for both tested H. borneoensis strains, and mortality rates increased up to 50% after 72-h exposure. This study documented for the first time the diversity and cytotoxic potency of Heterocapsa species from Malaysian waters.
format Article
author Hanifah, Afiqah Hamilton
Teng, Sing Tung
Law, Ing Kuo
Abdullah, Nursyahida
Chiba, Sheryl Uncha Andrew
Lum, Wai Mun
Tillmann, Urban
Lim, Po Teen
Leaw, Chui Pin
author_facet Hanifah, Afiqah Hamilton
Teng, Sing Tung
Law, Ing Kuo
Abdullah, Nursyahida
Chiba, Sheryl Uncha Andrew
Lum, Wai Mun
Tillmann, Urban
Lim, Po Teen
Leaw, Chui Pin
author_sort Hanifah, Afiqah Hamilton
title Six marine thecate Heterocapsa (Dinophyceae) from Malaysia, including the description of three novel species and their cytotoxicity potential
title_short Six marine thecate Heterocapsa (Dinophyceae) from Malaysia, including the description of three novel species and their cytotoxicity potential
title_full Six marine thecate Heterocapsa (Dinophyceae) from Malaysia, including the description of three novel species and their cytotoxicity potential
title_fullStr Six marine thecate Heterocapsa (Dinophyceae) from Malaysia, including the description of three novel species and their cytotoxicity potential
title_full_unstemmed Six marine thecate Heterocapsa (Dinophyceae) from Malaysia, including the description of three novel species and their cytotoxicity potential
title_sort six marine thecate heterocapsa (dinophyceae) from malaysia, including the description of three novel species and their cytotoxicity potential
publisher ELSEVIER
publishDate 2022
url http://eprints.um.edu.my/46175/
https://doi.org/10.1016/j.hal.2022.102338
_version_ 1814047576586977280
score 13.211869

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