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Reef Fish Associations with Sea Urchins in an Atlantic Oceanic Island

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Reef Fish Associations with Sea Urchins in an Atlantic Oceanic Island Mar Biodiv (2018) 48:1833–1839 DOI 10.1007/s12526-017-0677-4 ORIGINAL PAPER Reef fish associations with sea urchins in an Atlantic oceanic island Vinicius J. Giglio1,2 & Maria L. F. Ternes3 & Moysés C. Barbosa2 & César A. M. M. Cordeiro2 & Sergio R. Floeter4 & Carlos E. L. Ferreira2 Received: 19 November 2016 /Revised: 27 February 2017 /Accepted: 28 February 2017 /Published online: 16 March 2017 # Senckenberg Gesellschaft für Naturforschung and Springer-Verlag Berlin Heidelberg 2017 Abstract Many reef fish are known to be associated with Introduction particular microhabitats that provide food and refuge, such as branching corals, gorgonians, macroalgal beds and sea ur- Habitat structure and complexity are known to influence reef chins. We investigate the association of reef fishes with the fish abundance and diversity at various spatial scales from long-spined sea urchin Diadema antillarum in shallow reefs micro to mega habitats (Roberts and Ormond 1987; Ferreira of Trindade Island, southeastern Brazil. A total of 1283 fish et al. 2001;Rogersetal.2014). In reef environments, many individuals from seven families and nine species were associ- fish species are known to be associated with particular habi- ated with 495 sea urchins. Sea urchins provide important shel- tats, mostly due to optimal refuge against predators and avail- ter especially for juveniles of the Noronha wrasse, ability of food (Dahlgren and Eggleston 2000). Many organ- Thalassoma noronhanum. Larger fishes were found at higher isms are known to modify the environment or create micro- densities associated to sea urchins with larger spines. At reefs habitats, being described as ecosystem engineers (Jones et al. lacking structurally complex organisms, such as branching 1994). Several species of small sized or juvenile reef fish can corals, sea urchins can be an important refuge for juveniles be associated with microhabitats provided by complex bio- or small-bodied reef fish species, influencing their distribution genic sessile structures such as branching corals (Pereira and and acting as ecosystem engineers. Munday 2016), macroalgae (Chaves et al. 2013), gorgonians (Goh et al. 1999) and mobile organisms such as sea urchins, cucumbers and crinoids (Karplus 2014). Keywords Trindade island . Microhabitat . Habitat use . Fish The fish-sea urchin association has long been reported, es- interactions . Tropical reefs . Fish behavior . Reef complexity pecially for the cardinalfishes (Apogonidae) and clingfishes (Gobiesocidae) families with sea urchins from the family Diadematidae (Randall et al. 1964; Karplus 2014). The struc- Communicated by O. Aksel Bergstad tural complexity generated by sea urchin spines harbors a di- versity of small fish that can be closely associated, favoring the * Vinicius J. Giglio development of juvenile stages or even a whole life stage as an [email protected] obligatory association (Randall et al. 1964; Sakashita 1992). For some fish species, sea urchins may influence the density of their commensals in the reef by providing refuges against 1 Programa de Pós-Graduação em Ecologia, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil predators. For instance, Hartney and Grorud (2002) found a close association among the crowned sea urchin, 2 Reef Systems Ecology and Conservation Lab, Departamento de Biologia Marinha, Universidade Federal Fluminense, Rio de Centrostephanus coronatus, and the blue-banded goby Janeiro, Brazil Lythrypnus dalli. Results showed that the crowned sea urchin 3 Programa de Pós-Graduação em Zoologia, Universidade Estadual de has an influence on the abundance, recruitment, migration rates Santa Cruz, Bahia, Brazil and survival of this small fish. However, only a small fraction 4 Departamento de Ecologia e Zoologia, Universidade Federal de of associated fish is permanent and obligatory (Karplus 2014). Santa Catarina, Santa Catarina, Brazil Most of the fish and sea urchin associations are facultative and 1834 Mar Biodiv (2018) 48:1833–1839 commensal (Moore and Auster 2009). Fish from the sites around the island (Cordeiro et al. unpubl.)], and is the Gobioesocidae and Gobbidae families are also described as only species with long spines that hosts different fish species. ectoparasitic, in which the associated fish feed on the tube feet or pedicelaria of their hosts (Dix 1969; Karplus 2014). Data collection In some reefs, sea urchins occur at higher abundances, providing an increase in the reef complexity and, consequently, Data were collected from August to September 2014 at three microhabitats for the marine biota. This may have positive effects shallow sites (3–10 m depth) in the north of Trindade Island: for reef fish by providing them habitat structure, otherwise at Cabritas, Calheta and Ponta Norte. Observations were con- some tropical reefs, sea urchins can largely increase bioerosion ducted in rocky reefs through 26 roving scuba diving counts, (McClanahan and Kurtis 1991) and erode reef structural com- in which two observers searched for the specimens. plexity (Graham and Nash 2012). However, in the southwestern To avoid sampling the same sea urchin twice, observers roved Atlantic reefs, such associations between reef fish and sea urchins parallel to the reef in the same direction. When a sea urchin remain poorly described (Dalbern and Floeter 2012). was found, the observer slowly approached to verify the pres- The sea urchin Diadema antillarum was once abundant in ence of any associated fish, and when found, the abundance Atlantic tropical reefs and referred to as a keystone species up and body size of the fish species was described (total length – until the 1980s, when an event of mass mortality led to sig- TL). Fish were identified using checklists from Trindade nificant depletion (Lessios et al. 2001). Here, we describe the Island (Gasparini and Floeter 2001; Pinheiro et al. 2015). association among the long-spined sea urchin Diadema The size of the sea urchin spines was visually estimated based antillarum and reef fishes at Trindade Island, an oceanic island on the length of the largest primary spines and grouped into located in the southwestern Atlantic. At Trindade Island, in the three categories: short (≤5 cm), medium (6–15 cm) and long shallow reefs, this is the most abundant sea urchin, and is usu- (>15 cm). Additionally, observers described the behavior of ally found forming densely packed groups of dozens of indi- the fish associated with sea urchins and recorded their spatial viduals (Cordeiro et al. unpubl.). Individuals of D. antillarum distribution among the urchin’sspines. are commonly found in caves, overhangs, and crevices that In order to assess reef fish abundance, an underwater visual provide protection against predators and are more abundant in census were performed using belt transects (20x2m) at all the zones protected from strong waves (Alvarado 2008). The aim sampled sites (Cabritas, n = 11, Orelhas, n = 10, and Ponta Norte, of this study was to describe which fish species are associated n = 15). Sampling units were distributed randomly along rocky with D. antillarum and verify whether density and body size of reef areas, and all fish observed within transects were counted associated fish vary according to the size of sea urchin spines. and measured. In addition, we determined if density of fishes associated with sea urchins was correlated to those not associated with urchins, Data analysis for instance, fish moving across the reef or fish associated with other structures. Differences between body size and density of the most abun- dant fish species (species of which >15 individuals were re- corded) associated with sea urchins were compared using a Methods non-parametric ANOVA (Kruskal-Wallis test), since the re- sponse distribution was non-normal and data was nonpara- Study area metric. A post-hoc analysis using the Dunn’s test was per- formed to verify differences among categories of sea urchin Trindade Island, along with the Martin Vaz Archipelago, com- spine size. Composition of fish assemblages and mean fish prises the most isolated island complex of the Brazilian coast, density amongst sites were tested using a PERMANOVA and is located 1160 km off the coast with a terrestrial area of 9.2 (9999 permutations, package vegan, function adonis)and km2 (Gasparini and Floeter 2001). Compared to the Brazilian ANOVA, respectively. A Pearson correlation was used to ver- coast, the remote location makes Trindade Island home to ify whether overall abundance of the non-associated fish with impoverished fish (Floeter et al. 2008; Pinheiro et al. 2011) sea urchins was correlated with abundance of fish associated and benthos assemblages (Pereira-Filho et al. 2011). with the urchin D. antillarum. Analyses were conducted using Along the Brazilian coast, D. antillarum is more abundant the R software (R Core Team 2016). in the tropical northeastern region (Attrill and Kelmo 2007), and rare in the subtropical reefs along the south and southeast- ern coastline (Cordeiro et al. 2014). In the shallow reefs (5- Results 12m depth) of Trindade Island, D. antillarum is the dominant species among the five sea urchin species found locally [38% A total of 1283 fish from seven families and nine species were of total abundance of sea urchins and 0.01–1.5. ind.m−2 at five recorded in association with 495 individuals of D. antillarum Mar Biodiv (2018) 48:1833–1839 1835 with short (n =98),medium(n = 196) and long (n =201) lower abundance of individuals associated with sea urchin spine sizes. Individuals of D. antillarum with long and medi- spines (Pearson, r = 0.74, p < 0.02) at Cabrita. For other spe- um spines have higher densities of commensal fishes than cies, the correlation was not significant or could not be tested short-spined sea urchins (Kruskal-Wallis test, H = 117.1, due to a low number of individuals. Therefore, results should p < 0.001; Dunn’s test: long = medium > short). Seventy- be interpreted carefully because they represent cryptic behavior three percent of sea urchins with short spines hosted no com- and incidence is underestimated when sampling by visual cen- mensal fishes, while 83% of sea urchins with medium spines sus methods.
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