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Habitat Destruction and Ascidian Biodiversity Loss - an Assessment Int. J. of Life Sciences, 2017, Vol. 5 (1): 55-62 ISSN: 2320-7817| eISSN: 2320-964X RESEARCH ARTICLE Habitat Destruction and Ascidian Biodiversity Loss - An Assessment Vaidhyanathapuram Kesavan Meenakshi* and Sudalaimuthu Gomathy Department of Zoology, A.P.C. Mahalaxmi College for Women, Tuticorin, Tamilnadu. Corresponding Author: [email protected] Manuscript details: ABSTRACT Received: 19.01.2017 Intertidal rocky shores offer good substratum and habitat for sedentary Accepted: 28.02.2017 animals accounting for the rich biodiversity. Destruction of coastal Published : 06.04.2017 habitat by way of industrialization, port expansion activities and construction of tourist spots results in loss of marine resources. The Editor: Dr. Arvind Chavhan present review focuses the loss of ascidian biodiversity from the intertidal rocky area situated near the western side of the Thoothukudi Cite this article as: harbour North breakwater opposite to the SPIC Jothi terminal. Vaidhyanathapuram Kesavan Publications reporting the collection and biodiversity of ascidians from Meenakshi and Sudalaimuthu this area between 1980 and 2015 were reviewed in the context of Gomathy (2017) Habitat Destruction and Ascidian Biodiversity Loss - An destruction to the habitat. The study indicated the occurrence of 24 Assessment, International J. of Life species of ascidians belonging to 14 genera coming under 7 families Sciences, 5 (1): 55-62. over the period of 35 years. Colonial ascidians were predominant compared to simple ascidians. Eudistoma lakshmiani, Eudistoma viride, Acknowledgement: Didemnum psammathodes, Diplosoma swamiensis, Lissoclinum fragile, The authors are extremely grateful to Perophora formosona, Botrylloides chevalense, and Microcosmus curvus Dr. T.K. Renganathan, Professor were available all through the years. The destruction of the habitat in (Retd.), PG and Research Department this area has resulted in the total disappearance of marine resources of Zoology, V.O. Chidambaram and hence loss of ascidian biodiversity. College, Tuticorin for introducing us to the wonderful field of ascidian Key words: Ascidian, biodiversity, intertidal rocky area and habitat systematics. destruction. Copyright: © 2016 | Author(s), This is an open access article under the terms of the Creative Commons Attribution-Non-Commercial - No INTRODUCTION Derivs License, which permits use and distribution in any medium, The Gulf of Manaar coast extending from Rameswaram to Kanyakumari provided the original work is is predominated by calcrete and solid rocks. These rocky shores are properly cited, the use is non- model natural laboratories to learn the ecology of intertidal habitat as commercial and no modifications or they are environmentally rich with great biodiversity. Complex adaptations are made. intertidal rocky habitats provide many different spatial niches. The surface of rock exposed to strong beating surf offers a stable anchorage to many sedentary organisms. Most intertidal sedentary animals are filter feeders which can actively feed only when they are covered by seawater. The cracks and crevices in the rocks and boulders form dynamic microhabitats that provide shelter from dehydration on © 2017 |IJLSCI www.ijlsci.in 55 Vaidhyanathapuram and Sudalaimuthu, 2017 exposure to sun, wind and afford protection from occurrence, nutritive value, antimicrobial, breaking waves and a safe hide out from larger pharmacology, cytotoxicity, antifouling, chemical predators. They are abundant on the under surface of investigation and DNA bar coding of ascidians rocks where they are submerged for longer time. The collected from this area (Renganathan 1981, 1982, widely changing abiotic condition in the intertidal 1983a,b,c, 1984a,b,c; Renganathan and Krishnaswamy zone is a significant factor in creating a large number 1985; Renganathan 1986a,b; Krishnan et al., 1989; of ecological niches. Adaptations of different species to Meenakshi 1997; Meenakshi, 2000, 2004, 2008; withstand the biotic interactions like predation and Meenakshi et al., 2003; Meenakshi and Senthamarai competition are the factors that lead to zonation on the 2013; Renganathan 1983d,e,f, 1984d; rocky shore. The coastal zone is rich with respect to Paripooranaselvi, 2013; Meenakshi, 2010; Tamilselvi nutrients in the form of phyto and zooplankton. 2008; Tamilselvi et al., 2011; Ajithakumary 1994; Different species of filter feeding animals like mussels, Meenakshi 2009; Sri Kumaran and Bragadeeswaran oysters, bryozoans, sea squirts, anemones and 2014; Sri Kumaran et al., 2011, 2012, 2014a; Raja barnacles are supported by this plentiful food supply. Priyanka Mary et al., 2016; Santhana Ramasamy and This allows them to grow rapidly and produce many Senthil Kumar 2009; Rajesh and Murugan 2013, 2015; offspring. Habitat degradation caused by rapidly Santhana Ramasamy and Murugan 2003; Meenakshi et expanding coastal development is a direct threat to al., 2013; Veerabahu et al., 2013; Sri Kumaran et al., coastal marine biodiversity. Construction activities 2014b). between low and high tide line have serious implications on species diversity and abundance. Destruction causes instant harm to habitat, loss of MATERIALS AND METHODS resources such as food and mates, kills many species in the process resulting in loss of biodiversity. The Study area: present review focuses the status of the species In the context of review on habitat destruction and composition and loss of ascidian biodiversity in the loss of biodiversity, the intertidal rocky shore spread intertidal rocky shore of Thoothukudi coast over a over an area of 1000 m2 situated near the western side period of 35 years from 1980 to 2015. of the outer 4098.66 m long Thoothukudi harbour North breakwater (Latitude 8° 47’ 10” N and Literature Servey indicates that the study area has Longitude 78° 9’ 60” E) opposite to the SPIC Jothi been a paradise for many marine biologists. terminal was selected (Fig. 1). This area is in Researchers and students from various institutions all continuation with the sandy coastal stretch leading to over India have been visiting this place for collection of the Hare Island, one of the islands of Gulf of Mannar in marine fauna, flora and study of intertidal rocky the southeast coast of India. The habitat is habitat as a part of their curriculum. Till recently 40 predominated by loose calcrete rocks and large coral papers have been published on various aspects like Diplosoma macdonaldi stones with scattered taxonomy, embryology, breeding, fouling, ecology, embedded rocks and is mostly free from biology, distribution and seasonal variation in the anthropogenic activities though a few country boats Fig. 1: Study area before 2016 Fig. 2: Study area - 2016 56 Int. J. of Life Sciences, Vol. 5(1) March, 2017 Habitat Destruction and Ascidian Biodiversity Loss - An Assessment operated from here in early 1990. With moderate wind Aplousobranchia and Phlebobranchia, are the two and wave action, this shallow littoral zone anchors suborders of Enterogona and suborder Stolidobran- numerous sedentary animals including ascidians and chia of Pleurogona. A review of research papers on is exposed more than ½ a km during the lowest low ascidian collection and biodiversity of the study area tides. In addition to the sedentary animals, other fauna published since 1980 revealed the following. During including flat worms, annelids, arthropods, molluscs 1980 to 1989, 11 species of ascidians belonging and echinoderms were available in plenty in this study to 9 genera coming under 5 families were reported. Of area. Research papers on ascidian collection and these 10 were colonial ascidians - Eudistoma biodiversity of this area published between the years lakshmiani, Eudistoma viride, Didemnum 1980 - 2015 has been considered here for review. psammathodes, Diplosoma swamiensis, Lissoclinum Field visit to the study area was also carried out in the fragile, Ecteinascidia imperfecta, Ecteinascidia early 2016. krishnani, Perophora formosona, Botrylloides chevalense, Botrylloides magnicoecum and one was simple ascidian Microcosmus curvus (Renganathan RESULTS AND DISCUSSION 1981, 1982, 1983a,b,c, 1984a,b,c, Renganathan and Krishnaswamy 1985, Renganathan 1986a,b). The Ascidiacea are a class of the subphylum Tunicata of phylum Chordata. Class Ascidiacea includes two 13 species of ascidians belonging to 11 genera coming orders. They are Enterogona and Pleurogona. under 6 families were recorded from 1990 - 1999. Out Polyclinum constellatum Eudistoma lakshmiani Eudistoma pyriforme Eudistoma viride Didemnum granulatum Didemnum psammathodes Diplosoma macdonaldi Diplosoma swamiensis Lissoclinum fragile Fig. 3: Ascidian biodiversity of the study area www.ijlsci.in Int. J. of Life Sciences, Vol. 5(1) March, 2017 57 Vaidhyanathapuram and Sudalaimuthu, 2017 Trididemnum clinides Ecteinascidia garstangi Ecteinascidia venue Perophora formosana Ascidia gemmata Styela canopus Symplegma oceania Symplegma viride Botrylloides chevalense Botrylloides magnicoecum Herdmania momus Microcosmus curvus Fig. 3 continued : Ascidian biodiversity of the study area 58 Int. J. of Life Sciences, Vol. 5(1) March, 2017 Habitat Destruction and Ascidian Biodiversity Loss - An Assessment Table 1: Ascidian biodiversity of the study area from 1980 to 2015 Classification S/C 1980- 1990- 2000- 2010- 1989 1999 2009 2015 Class Ascidiacea Order I Enterogona Perrier, 1898 Suborder I Aplousobranchia Lahille, 1887 Family 1 Polyclinidae Milne-Edwards, 1841 Genus 1 Polyclinum Savigny, 1816 1. Polyclinum constellatum
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