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The Sea Anemone Exaiptasia Diaphana (Actiniaria: Aiptasiidae) Associated to Rhodoliths at Isla Del Coco National Park, Costa Rica

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The Sea Anemone Exaiptasia Diaphana (Actiniaria: Aiptasiidae) Associated to Rhodoliths at Isla Del Coco National Park, Costa Rica The sea anemone Exaiptasia diaphana (Actiniaria: Aiptasiidae) associated to rhodoliths at Isla del Coco National Park, Costa Rica Fabián H. Acuña1,2,5*, Jorge Cortés3,4, Agustín Garese1,2 & Ricardo González-Muñoz1,2 1. Instituto de Investigaciones Marinas y Costeras (IIMyC). CONICET - Facultad de Ciencias Exactas y Naturales. Universidad Nacional de Mar del Plata. Funes 3250. 7600 Mar del Plata. Argentina, [email protected], [email protected], [email protected]. 2. Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET). 3. Centro de Investigación en Ciencias del Mar y Limnología (CIMAR), Ciudad de la Investigación, Universidad de Costa Rica, San Pedro, 11501-2060 San José, Costa Rica. 4. Escuela de Biología, Universidad de Costa Rica, San Pedro, 11501-2060 San José, Costa Rica, [email protected] 5. Estación Científica Coiba (Coiba-AIP), Clayton, Panamá, República de Panamá. * Correspondence Received 16-VI-2018. Corrected 14-I-2019. Accepted 01-III-2019. Abstract. Introduction: The sea anemones diversity is still poorly studied in Isla del Coco National Park, Costa Rica. Objective: To report for the first time the presence of the sea anemone Exaiptasia diaphana. Methods: Some rhodoliths were examined in situ in Punta Ulloa at 14 m depth, by SCUBA during the expedition UCR- UNA-COCO-I to Isla del Coco National Park on 24th April 2010. Living anemones settled on rhodoliths were photographed and its external morphological features and measures were recorded in situ. Results: Several indi- viduals of E. diaphana were observed on rodoliths and we repeatedly observed several small individuals of this sea anemone surrounding the largest individual in an area (presumably the founder sea anemone) on rhodoliths from Punta Ulloa. Conclusions: The geographic distribution is extended as well as their bathymetric distribution from the intertidal to 14 m depth. The photographs provide evidence of clonal reproduction by pedal laceration. Key words: Exaiptasia diaphana; subtidal; Punta Ulloa; Cocos Island; Eastern Tropical Pacific; Costa Rica. Acuña, F. H., Cortés, J., Garese, A., & González-Muñoz, R. (2020).The sea anemone Exaiptasia diaphana (Actiniaria: Aiptasiidae) associated to rhodoliths at Isla del Coco National Park, Costa Rica. Revista de Biología Tropical, 68(Suppl. 1), S283-S288. The marine biodiversity of Isla del Coco two species of sea anemones have been record- has been the subject of scientific interest par- ed for the island, Telmatactis panamensis (Ver- ticularly for its biogeographic relevance and rill, 1869) (Acuña, Cortés, & Garese, 2012), diversity. A list of published records of the and Anthopleura nigrescens (Verrill, 1928) marine organisms found in the area has been (Acuña, Garese, Excoffon, & Cortés 2013). compiled by Cortés (2012). The growing inter- During the expedition UCR-UNA-COCO-I to est in these investigations has been demon- Isla del Coco National Park in April 2010, we strated in the recent International Symposium sampled many sites including a rhodolith bed on Isla del Coco held in February 2018 at the at 14 m depth, in Punta Ulloa. The rhodoliths University of Costa Rica. Although there have constituted a benthic community dominated been many studies on different invertebrate by free-living calcareous algae that can roll groups, the sea anemones (order Actiniaria) over the substrate pushed by the movement diversity is still poorly studied. In fact, only of water currents. Rhodoliths are one of the Rev. Biol. Trop. (Int. J. Trop. Biol. ISSN-0034-7744) Vol. 68(Suppl. 1): S283-S288, March 2020 283 groups of algae with the widest geographical, Synonymy: Actinia diaphana Rapp, climatic and bathymetric distribution and they 1829; Cribina diaphana: Deshayes & Milne- are considered as bioengineers due to their Edwards, 1840; Actinia elongata: Delle Chia- propensity to construct a hard and complex je, 1841; Adamsia diaphana: Milne-Edwards, substrate with hollows and sinuosities, which 1857; Dysactis pallida: Agassiz in Verrill, favors the settlement of numerous species 1864; Bartholomea tagetes: Duchassaing & and the development of various microhabitats Michelotti, 1864; Bartholomea inula: Duchas- (Foster, Amado-Filho, Kamenos, Riosmena- saing & Michelotti, 1864; Dysactis mimosa: Rodríguez, & Steller, 2013; Mallol, Barberá, Duchassaing & Michelotti, 1864; Dysactis & Goñi, 2015). The sea anemone Exaiptasia minuta: Verrill, 1867; Paranthea minuta: Ver- diaphana (Rapp, 1829) (= Exaiptasia pallida) rill, 1868; Paranthea pallida: Verrill, 1868; was observed among the species associated to Disactis mimosa [sic]: Duchassaing, 1870; the rhodoliths. This paper documents the asso- Aiptasia saxicola: Andres, 1881; Aiptasia ciation and constitutes the first record of this diaphana: Andres, 1883; Aiptasia Agassizii actiniarian in the Isla del Coco National Park. [sic]: Andres, 1883; Aiptasia inula: Andres, 1883; Aiptasia minuta: Andres, 1883; Aipta- sia mimosa: Andres, 1883; Aiptasia tagetes: MATERIAL AND METHODS Andres, 1883; Aiptasia pallida: McMurrich, 1887; Aiptasia leiodactyla: Pax, 1910; Aiptasia Several rhodoliths were examined in situ insignis: Carlgren, 1941; Aiptasioides pallida: in Punta Ulloa at 14 m depth, by SCUBA dur- Stephenson, 1918; Aiptasiomorpha diaphana: ing the expedition UCR-UNA-COCO-I to Isla Stephenson, 1920; Aiptasiomorpha leiodac- del Coco National Park on 24th April 2010. tyla: Stephenson, 1920; Aiptasia pulchella: Living specimens of sea anemones settled on Carlgren, 1943; Aiptasia californica: Carlgren, rhodoliths were photographed and its external 1952; Aiptasiomorpha minuta: Uchida & Soya- morphological features and measures were ma, 2001; Aipstasia pulchella [sic]: Reimer recorded in situ. Identification of observed et al., 2007; Exaiptasia pallida: Grajales & specimens were made following Fautin, Cleve- Rodríguez, 2014. land, Hickman, Daly, and Molodtsova (2007) and Grajales and Rodríguez (2014). The synon- Characteristics of studied specimens of ymies follow Grajales and Rodríguez (2014), Exaiptasia diaphana: All taxonomic diag- and Daly and Fautin (2018). nostic features and measures observed in the specimens examined agree very well with those RESULTS of the external anatomy described for Exaipta- sia diaphana: oral disc from a few to 20 mm Classification in diameter. Pedal disc regularly shaped, wider than column. Column elongated, smooth, not Phylum Cnidaria distinctly divisible into scapus and capitu- Sub Phylum Anthozoa lum, translucent with scattered spots distally, Clase Hexacorallia mesenterial insertions visible as light lines in Order Actiniaria some individuals, whitish on the distal end Suborder Enthemonae (Fig. 1B). Oral disc brown, translucent, mouth Superfamily Metridioidea white encircled with a brown ring, mesente- Family Aiptasiidae rial insertions visible through oral disc as dark Genus Exaiptasia lines (Fig. 1C). Tentacles simple, smooth, long, Exaiptasia diaphana (Rapp, 1829) slender, tapering toward tips, occurring only at (Figure 1A) margin and in variable in number, same color 284 Rev. Biol. Trop. (Int. J. Trop. Biol. ISSN-0034-7744) Vol. 68(Suppl. 1): S283-S288, March 2020 Fig. 1. A) Exaiptasia diaphana on a rhodolith in Punta Ulloa. B) Individual showing the translucent column with scattered spots distally. C) Expanded oral disc with tentacles (some with white around base and transverse bars), mouth and dark mesenterial insertions. D) A founder anemone () surrounded by some small individuals () possibly produced by clonal reproduction. Scale bars: 20 mm. than oral disc, some have white transverse bars Distribution other than Isla del Coco around its base or on its oral face (Fig. 1C). National Park: This species has a widespread distribution, recorded almost worldwide along Natural history: Exaiptasia diaphana can the northwestern Atlantic coast (Fautin, 2013), reproduce asexually by pedal laceration, in the Gulf of Mexico (e.g. Cary, 1906; Gunter which the animal is subdivided into generat- & Geyer, 1955) and the Caribbean Sea (e.g. ing clones that separate from small portions Silbiger & Childress, 2008; González-Muñoz, of the pedal disc (Clayton, 1985). We repeat- Simões, Sanchez-Rodriguez, Rodríguez, & edly observed several small individuals of E. Segura-Puertas, 2012), the coast of Brazil in diaphana surrounding the largest individual in the southwestern Atlantic Ocean (e.g. Corrêa, an area (presumably the founder sea anemone) 1964, 1973; Dube, 1983; Pires, Migotto, & on rhodoliths from Punta Ulloa (Fig. 1D). Marques, 1992; Castro, Echeverria, Pires, Mas- Based on these observations, we suggest that carenhas, & Freitas, 1995; Echeverria, Pires, smaller individuals were clonally produced by Mederios, & Castro, 1997; Zamponi, 1998; pedal laceration of the founder individual. Farrapeira, Melo, Barbosa, & Silva, 2007), the Rev. Biol. Trop. (Int. J. Trop. Biol. ISSN-0034-7744) Vol. 68(Suppl. 1): S283-S288, March 2020 285 Galapagos Islands (Fautin et al., 2007), and in fission has also been reported (Clayton, 1985). Australia. The distribution of this species was The reproduction rate by pedal laceration is extended by Grajales and Rodriguez (2014) very high, so this species can easily become to the Mediterranean Sea and western Africa a plague to other organisms such as corals or (geographic distribution of the former Aiptasia sponges. In addition, this species reproduce diaphana), the east and west Pacific coasts (e.g. sexually by the release of gametes, external fer- California [geographic distribution of former tilization and
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