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Analysis of Morphometry and Dimorphism in Enhydrus Sulcatus (Wiedeman, 1821) (Coleoptera: Gyrinidae)

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Analysis of Morphometry and Dimorphism in Enhydrus Sulcatus (Wiedeman, 1821) (Coleoptera: Gyrinidae) Neotropical Biology and Conservation 6(3):178-186, september-december 2011 © by Unisinos - 10.4013/nbc.2011.63.05 Analysis of morphometry and dimorphism in Enhydrus sulcatus (Wiedeman, 1821) (Coleoptera: Gyrinidae) Análise do dimorfismo e morfometria em Enhydrus sulcatus Thiago Marinho Alvarenga1 [email protected] Abstract Enhydrus sulcatus (Wiedeman, 1821) (Coleoptera: Gyrinidae) were found swimming Fernanda Fonseca e Silva1 in circles on the surface of streams shaded by forests in preserved sites. The sexual [email protected] dimorphism was evaluated in that species through the quantification of differences oc- curring among the length of the first pair of legs, width of the mesonotum, total length Marconi Souza Silva2 and body mass of 112 individuals, 71 being females and 41 males. There was significant [email protected] difference among the width of the mesonotum (KW-H(1.112) = 32.80; p < 0.05), total length (KW-H (1.112) = 38.00; p < 0.05), length of the first leg (KW-H(1.112) = 47.58; p < 0.05) and body weight (KW-H (1.82) = 23.86; p < 0.05) of male and female E. sulcatus. The length of the first leg relates positively and significantly with the width of the mesono- tum (r2 = 0.40; p < 0.05), with the total weight (r2 = 0.36; p < 0.05) and with the total body length of individuals E. sulcatus (r2 = 0.33; p < 0.05). The total length of individuals of E. sulcatus relates positively and significantly with width of the mesonotum (r2 = 0.65; p < 0.05). In this study a clear sexual dimorphism was shown in Enhydrus sulcatus and was present in various other body structures besides the tarsal dilations. Key words: sexual dimorphism, Gyrinidae, Enhydrus sulcatus, measured morphometrics. Resumo Enhydrus sulcatus (Wiedeman, 1821) (Coleoptera: Gyrinidae) foram encontrados na- dando em círculos na superfície de riachos sombreados por matas em locais preser- vados. O dimorfismo sexual foi avaliado nessa espécie através da quantificação de diferenças ocorrentes entre o comprimento do primeiro par de pernas, largura do me- sonoto, comprimento total e massa corporal de 112 indivíduos sendo estes 71 fêmeas e 41 machos. Houve diferença significativa entre a largura do mesonoto (KW-H(1, 112) = 32,80; p < 0,05), comprimento total (KW-H (1, 112) = 38,00; p < 0,05), comprimento da primeira perna (KW-H(1, 112) = 47,58; p < 0, 05) e peso corporal (KW-H (1,82) = 23,86; p < 0,05) de machos e fêmeas de E. sulcatus. O comprimento da primeira pata relaciona-se positiva e significativamente com a largura do mesonoto (r2 = 0,40; p < 0,05), com o peso total (r2 = 0,36; p < 0,05) e com o comprimento total do corpo dos indivíduos de E. sulcatus (r2 = 0,33; p < 0,05). O comprimento total dos indivíduos de E. 1Centro Universitário de Lavras (UNILAVRAS), sulcatus relaciona-se positiva e significativamente com largura do mesonoto (r2 = 0,65; Rua Padre José Poggel, 506 Centenário, p < 0,05). Neste estudo, é mostrado um claro dimorfismo sexual em Enhydrus sulcatus 37200-000, Lavras, MG, Brasil. e presente em várias outras estruturas corporais além das dilatações tarsais. 2Núcleo de Pesquisa em Saúde e Biológicas, Centro Universitário de Lavras, Rua Padre José Poggel, 506 Centenário, Cx. P. 3037, Palavras-chave: Dimorfismo sexual, Gyrinidae, Enhydrus sulcatus, medidas morphometric. 37200-000 Lavras, MG, Brasil. Analysis of morphometry and dimorphism in Enhydrus sulcatus (Wiedeman, 1821) (Coleoptera: Gyrinidae) Introduction Adult individuals of Enhydrus sulca- ian forest and gallery forests (Rizzini, tus (Wiedeman, 1821), present a me- 1997). The streams are bordered by Possessing about 35,000 known spe- tallic dark blue color, striated elytra preserved gallery forests (Callisto et cies, the order Coleoptera is one of the and a length between 18 and 22 mm, al., 2002; Diniz et al., 2010). largest insect orders (Triplehorn and (Costa-Lima, 1952; Hatch, 1926; Johnson, 2005). In Brazil the suborder Regimbart, 1877). The occurrence of Collection methodology and Adephaga, is found in 6 families and Enhydrus sulcatus in Brazil has been observation about 245 genera and 1,480 species; it verified from the states of Espírito includes several families that occur in Santo to Santa Catarina (Hatch, 1926). Individuals of Enhydrus sulcatus that aquatic or semi-aquatic environments, According to Mankõ (1997) they are collectively swam on the surface of or associated to the litter or semi- found in lotic waters that run through headwater streams were captured with decomposed wood in forested areas, hills of preserved forest where they an entomological net with 1x1mm most of the species being predatory inhabit small pools of approximately mesh, sexed according to the dimor- on other insects, in the larval and adult 6m in diameter. phism in the tarsal of the first leg, stage (Costa, 1997). Hydradephaga, The sexual dimorphism in Enhydrus measured with a digital caliper rule, Coleoptera from aquatic habits, for sulcatus was described by Regimbart, weighed and released at the same the most part, have been represented (1924) based on the presence of a con- capture site. The morphological char- in Brazil, up to now, by 497 species spicuous enlargement in the tarsal of acteristics measured were total length distributed in 48 genera in the families the first leg of the males (Costa-Lima, (TL), width of the mesonotum (WM) Dytiscidae, Gyrinidae, Haliplidae and 1952). However, the magnitude of this and length of the first leg (LFL). Noteridae (Benetti et al., 2003). dimorphism has not been quantified, In the world there are 900 species of up to now, in other corporal structures Data analysis Gyrinidae allocated to 13 genera, the of this species. In the insects, sexual highest diversity being in the tropi- dimorphism related to size, presents To evaluate the relationships among cal and subtropical areas, that is, the considerable intra-specific variations width of the mesonotum, total length, highest diversity in hot countries (Adams and Funk, 1997; Teder and length of the first leg and weight for (Mascaró, 1967). All of the species Tammaru, 2005; Fairn et al., 2007a, all E. sulcatus individuals, linear re- are aquatic and present an elliptical 2007b; Cook et al., 2006; Andersson, gression was used. The normality of form with short antennae and divided 1994; Nylin and Wedell, 1994). the data was tested to 5% of probabil- eyes (Booth et al. 1990), which en- The present study evaluated morpho- ity using the Shapiro-Wilk test (Ham- able them to see out of, as well as in metric differences occurring in the mer et al., 2001). To evaluate differ- the water, favoring their defense from total length, width of the mesonotum, ences in the width of the mesonotum, natural enemies. On being alarmed, length of the first leg and corporal mass total length, length of the first leg and they move quickly and show a cir- of Enhydrus sulcatus with the intention weight between males and females of cular movement, that gives them the of elucidating the magnitude and rela- E. sulcatus, the Kruskal-Wallis test name of “whirligig beetles.” The rep- tionships of these measurements in the was used (Hammer et al., 2001). For resentatives of Gyrinidae are excellent determination of the dimorphism. ordination of the morphometric char- divers and at the same time capable of acteristics in relation to the sex, the flight, a property that they use to dis- Material and Methods non metric multidimensional stagger perse themselves. Their complete life model was used (nMDS). The PAST cycle is dependent on water, since lar- Study area program was used for the analyses vae, as well as adults, they are aquatic. (Hammer et al., 2001). The larvae usually inhabit the bottom The study was conducted from of ponds and slow streams (Skaife, January, 2008 to January, 2009, in Results 1979), but the adults are neustonic, high altitude streams of the Reser- commonly found in dense and con- va Biológica Unilavras-Boqueirão A total of 112 individuals were mea- spicuous aggregations, inhabiting still (21020’47”S/44059’27”W), in the mu- sured, 67 females and 39 males, in waters of small streams, lakes or tem- nicipal district of Ingaí, and streams the Reserva Biológica Unilavras-Bo- porary pools (Eisner and Aneshansley, in Delfinópolis, Minas Gerais, Bra- queirão and 4 females and 2 males in 2000). When harassed, they liberate zil. The distance between the two Delfinópolis. substances from pygidium glands that collection sites is approximately 170 The E. sulcatus females presented a act as an alarm and defense against km (Figure 1). The predominant veg- length of 1.67cm (sd=0.07), 0.84cm predators (Barth, 1960; Eisner and etation in the two places is Brazilian width (sd=0.05), length of the first Aneshansley, 2000). Savannah and includes fields, ripar- leg 1.20cm (sd=0.11) and a weight Neotropical Biology and Conservation 179 Thiago Marinho Alvarenga, Fernanda Fonseca e Silva, Marconi Souza Silva Figure 1. Map of Brazil with prominence for Minas Gerais (MG) and two municipal districts where morphometric measurements were taken in individuals of Enhydrus sulcatus (Wiedman, 1821). of 0.26g (sd=0.05) on average. The (KW-H(1.112) = 47.58; p < 0.05) and part of the behavior and way of life males of E. sulcatus presented a length between the average corporal weight of of these animals can be a reflection of 1.85 cm (sd=0.13), width 0.91 cm males and females of E. sulcatus (KW- of the dimensions and forms of the (sd=0.16), length of the first leg of H (1.82) = 23.86; p < 0.05) (Figure 3). exoskeleton (Dally, 1985). 1.51cm (sd=0.21) and a weight of The morphometry also revealed that According to Thorpe (1976) varia- 0.34g (sd=0.08) on average (Table 1).
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