Biphallia in imposexed females of marine gastropods: new record for Nassarius vibex from Brazil.
Quantification of TBT by chemical analysis in water or sediment is very onerous, therefore imposex as a tool to detect contamination by organotin compounds is often used. Five genus of marine gastropods in the Brazilian littoral have already been studied and the occurrence of imposex was related to either mild or severe contamination by TBT (Fernandez et al., 2005 and Limaverde et al., 2007). Nassarius (Mollusca: Gastropoda) is a ubiquitous genus that has been proposed as a bioindicator of TBT pollution (Marshall and Rajkumar, 2003). Here, we report the novel occurrence of imposex in Nassarius vibex (Say) in south Brazil and the biphallia in imposexed females of this species.
Specimens of N. vibex were collected at Flexeira beach (22[degrees] 56' S and 43[degrees] 53' W), Itacuruca Island, Rio de Janeiro state, Brazil, in the intertidal zone at spring low tide in September 2007. Two fixed transects (500 m apart) were established from the lower limit of the swash zone to 10 m above the drift line (supralittoral). Next, ten equally spaced sampling strata parallel to the water line were marked according to a systematic design with stratification. At each stratum, five replicate quadrats of 0.04 [m.sup.2] (systematically allocated 3 m apart) were taken to a depth of 25 cm and sieved through 0.7 mm mesh. This beach is exposed to effects of the yachting activities of Itacuruca Yacht Club (distant 1.1 km) and Sepetiba Harbor (distant 7.3 km), which constituted potential sources of TBT pollution.
In the laboratory, shell length (Figure 1a and b) was measured with a vernier caliper, then cracked and opened in a vice, and the individuals of N. vibex removed and examined for sex determination. Individuals having seminal vesicle were identified as males while others with seminal vesicle absent, as females. Females with male sex organs (e.g. penis) were identified as imposexed females.
Penis length of males and imposexed females was measured under a stereoscopic microscope and the Relative Penis Length Index (RPLI) and Relative Penis Size Index (RPSI) were calculated according to Gibbs and Bryan (1987).
A total of 155 individuals were collected, with 86 males (55.48%, Figure 1c) and 69 females (44.52%). All the females examined present the occurrence of imposex (Figure 1d). Two imposexed females presented biphallia (i.e. double penis, see Figure 1e and f). These penises were similar in shape but have different lengths ([female]1 = 3.07 / 1.96 mm (shell length 12.87 mm) and [female]2 = 7.87 / 1.78 mm (shell length 12.89 mm)). The occurrence of biphallia is an additional abnormality of the female reproductive system and has recently been reported by Meirelles et al. (2007) for an imposexed female of the gastropod Leucozonia nassa (Gmelin) .
[FIGURE 1 OMITTED]
The penis length of females exhibiting imposex ranged from 0.27 to 9.26 mm while male penis length ranged from 3.85 to 11.21 mm. Female penis length (mean = 3.07 mm, SD = [+ or -]1.96) was significantly smaller (t test = 15.86 P < 0.05) than male penis length (mean = 7.87 mm, SD = [+ or -]1.78). However, there was no significant difference between male mean shell length (12.89 mm) and that of females (12.87 mm) (t test = 1,65 P > 0.05). RPLI and RPSI values were 39.01 and 5.93%, respectively. These values were higher when compared to those obtained by Lima-Verde et al. (2007) for the same species in northeast Brazil (RPLI = 0 to 8.25, RPSI = 0 to 0.06), suggesting that Flexeira beach presented higher TBT contamination levels. Further studies will be conducted to assess the use of Nassarius vibex as a bioindicator species.
Received May 13, 2008--Accepted May 28, 2008--Distributed February 28, 2009 (With 1 figure)
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Cardoso, RS. *, Caetano, CHS. and Cabrini, TMB.
Laboratorio de Ecologia Marinha Universidade Federal do Estado do Rio de Janeiro--UNIRIO, Av. Pasteur, 458, Urca, CEP 22290-240, Rio de Janeiro, RJ, Brazil
* e-mail: email@example.com