Molecular identification of ascidians from the Palk Bay Region, Southeast coast of India

Iyappan, Kathirvel; Ananthan, G.; Sathishkumar, R

doi:10.3109/19401736.2015.1074224

Cited by 3 publications

(2 citation statements)

References 13 publications

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“…This result indicates that there was incursion of native and invasive ascidian populations to different parts of the world. A similar phylogenetic method was used for ascidian identification in other geographical regions as well (Iyappan, Ananthan, & Sathishkumar, 2016; Jaffarali, Akram, & Arshan, 2018; Lee & Shin, 2014; Smith, Cahill, & Fidler, 2010).…”

Section: Discussionmentioning

confidence: 99%

Identification and population genetic comparison of three ascidian species based on mtDNA sequences

Bhattachan

Qiao

Dong

2020

Ecology and Evolution

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Ascidians are sessile marine chordate invertebrates found along seashores worldwide and are typically regarded as invasive organisms. Knowledge concerning their global genetic structure and subsequent invasive potential is limited. Here, we identified three ascidians—Ciona robusta, Ciona savignyi, and Styela clava from the northeast region of China using morphological characteristics and mitochondrial cytochrome c oxidase subunit I (cox1) as genetic marker. We additionally used phylogenetics to aid in the identification of these three species. The results of a population genetic analysis showed that among the three species, the level of haplotype diversity was particularly high within C. savignyi, and nucleotide diversity varied moderately. We divided the three species separately into native and invasive populations using 170 cox1 sequences from global resources to explore population genetic structure and invasive potential. Although in the network analysis Ciona spp. formed haplogroups of native and invasive populations, some haplotypes were still shared. We found that the haplotypes did not cluster within the network of S. clava. Our AMOVA results also showed that Ciona spp. had a weak genetic structure, and less genetic differentiation was present in S. clava. These data suggest that there are extensive incursions of these three ascidians into different geographical regions. Global comparisons of ascidian populations will help in the understanding of their population genetic structure and invasive potential, hence providing important insights regarding conservation as well as management.

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Section: Discussionmentioning

confidence: 99%

Identification and population genetic comparison of three ascidian species based on mtDNA sequences

Bhattachan

Qiao

Dong

2020

Ecology and Evolution

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“…The reason is it is not easier to endure low salinities at high temperatures than at low temperatures (Dybern, 1969;Knaben, 1952;Runnstrom, 1929;Sabbadin, 1955) and as a result, many marine organisms cannot survive in the high tidal areas (Dybern, 1963(Dybern, , 1969Millar, 1953Millar, , 1971. authors Clampitt (1970Clampitt ( , 1973, Harman (1972); Wise and Molles (1979), Karthikeyan (2010), reported that substratum is a significant dynamics, space competition and predation (Castilla et al, 2002;Forward et al, 2000;Holloway & Connell, 2002;Lambert, 2001;Namaguchi et al, 1997;Tsuda et al, 2003;Vazquez & Young, 1996). It is commonly documented that when the ascidian biota is undisturbed, the characteristic of ascidians population is more or less equivalent and the evenness would be higher.…”

Section: Discussionmentioning

confidence: 99%

Seasonal distribution of solitary and colonial benthic ascidians (Chordata) with ecological gradients in and around Andaman and Nicobar Islands, India

Murugan,

Ananthan,

Balachandar

et al. 2023

Marine Ecology

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Ascidians are rapidly emerging biofouling organisms that generally occur on the natural and artificial substratum of the marine environment. However, very few studies have been reported on their species diversity and distribution patterns. This present investigation focuses on the seasonal impact on ascidians diversity. The distributions of ascidians were recorded by the collection of samples in six sampling stations from Andaman and Nicobar Islands. A total of 43 species of ascidians (32 colonial, 11 solitary) were recorded and most of the species are under the Didemnidae family. Various diversity indexes were utilized to examine the diversity, richness and evenness of species and to look at the assorted variety among tests and their likeness regarding species composition. The greatest (3.227) individuals were observed during summer season in Pigeon Island and the lowest (2.063) number of species were recorded during the monsoon season in Haddowharf harbour. The Margalef richness (d) fluctuated between in the range of 2.033 and 5.53 during the monsoon in Haddowharf harbour and Carbyns Cove beach in summer seasons. The Pielou's evenness record (J′) changed from 0.7409 to 0.9713. Diversity indexes were recorded as followed the order of 0.9642, 0.9552, 0.9482 and 0.9292 at Carbyns Cove shoreline, Burmanella, Pigeon Island and Campbell Bay individually during summer season. Present findings in the cluster examination uncovered that the species at various stations have framed four gatherings. Most elevated species rates were spread in summer. Field observation shows that species distribution is able to tolerate temperature ranges of 26.9–30.3°C and salinity of 32.1–34.64 ppt. Occasional examples of space occupation by colonial ascidians corresponded with seasonal changes in seawater temperature and salinity.

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DNA bar coding of Aplousobranchiata and Phlebobranchiata Ascidians (Phylum:Chordata) inferred from mitochondrial cytochrome oxidase subunit I (COI) gene sequence approach in Andaman and Nicobar Islands, India: a first report

Murugan

Ananthan

Arunkumar

2020

Mitochondrial DNA Part A

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Molecular identification of ascidians from the Palk Bay Region, Southeast coast of India

Abstract: This study is the first report of molecular identification of ascidian species of the Palk Bay, Southeast coast of India. This information about Palk Bay ascidian communities provides a baseline of general biodiversity of that ecosystem.

Cited by 3 publications

References 13 publications

Identification and population genetic comparison of three ascidian species based on mtDNA sequences

Identification and population genetic comparison of three ascidian species based on mtDNA sequences

Seasonal distribution of solitary and colonial benthic ascidians (Chordata) with ecological gradients in and around Andaman and Nicobar Islands, India

DNA bar coding of Aplousobranchiata and Phlebobranchiata Ascidians (Phylum:Chordata) inferred from mitochondrial cytochrome oxidase subunit I (COI) gene sequence approach in Andaman and Nicobar Islands, India: a first report

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