Effect of temperature on oviposition in four species of the melanogaster group of Drosophila

Efeito da temperatura na oviposição em quatro espécies do grupo melanogaster da Drosophila

EFFECT OF TEMPERATURE ON OVIPOSITION IN FOUR SPECIES OF THE melanogaster GROUP OF Drosophila

TULIKA SRIVASTAVA and B. N. SINGH

Genetics Laboratory, Department of Zoology, Banaras Hindu University, Varanasi 221¾ 005, India

Correspondence to: Prof. B. N. Singh, Genetics Laboratory, Department of Zoology, Banaras Hindu University, Varanasi ¾ 221005, India

Received June 30, 1997 ¾ Accepted June 05, 1998 ¾ Distributed August 28, 1998

(With 1 figure)

ABSTRACT

Experiments were conducted to test the effect of temperature on oviposition in four species of the melanogaster group of Drosophila: D. ananassae, D. bipectinata, D. malerkotliana and D. biarmipes. In each species, two wild strains were used and eggs laid by females at three different temperatures (19°C, 24°C and 30°C) were counted for four days at 24 h interval. It is evident from the results that females of D. ananassae, D. bipectinata, D. malerkotliana and D. biarmipes lay low number of eggs at low temperature (19°C). Thus oviposition in these four species of Drosophila is significantly reduced at low temperature.

Key words: Four Drosophila species, melanogaster group, temperature, oviposition.

RESUMO

Efeito da temperatura na oviposição em quatro espécies do grupo melanogaster da Drosophila

Experimentos foram dirigidos para testar o efeito da temperatura na oviposição em quatro espécies do grupo melanogaster da Drosophila: D. ananassae, D. bipectinata, D. malerkotliana e D. biarmipes. Em cada espécie, duas linhagens selvagens foram usadas e os ovos depositados por fêmeas em três temperaturas (19°C, 24°C e 30°C) foram contados por quatro dias com intervalo de 24 horas. É evidente, a partir dos resultados, que as fêmeas de D. ananassae, D. bipectinata, D. malerkotliana e D. biarmipes depositam um número mais baixo de ovos em temperaturas baixas. Deste modo, a oviposição nestas quatro espécies de Drosophila é reduzida significativamente em baixa temperatura.

Key words: quatro espécies de Drosophila, grupo melanogaster, temperatura, oviposição.

INTRODUCTION

Oviposition is an important aspect of non sexual behaviour of adult female Drosophila (Grossfield, 1978). Oviposition behaviour is an adaptive trait in the evolutionary ecology of Drosophila (Jaenike, 1982; Mueller, 1985). Most species are opportunistic generalists in their feeding behaviour but many species are selective in their choice of oviposition substrates (Carson, 1971).

Oviposition site preference (OSP) has been studied in different species of Drosophila and intra and interspecific variations with respect to OSP have been reported (Pyle, 1976; Richmond & Gerking, 1979; Takamura & Fuyama, 1980; Takamura, 1984; Moore, 1985). Choice of oviposition site is influenced by various extrinsic factors such as substrate condition, humidity, density of females, temperature, light, ethanol and other chemicals (Mainardi, 1968; Delsolar & Palomino, 1970; Markow, 1975; Takamura, 1980; Jaenike, 1982; Wogaman & Seiger, 1983).

Evidence for genetic control of oviposition behaviour has also been presented in certain cases (Delsolar, 1968; Takamura & Fuyama, 1980; RuizDubreuil & Delsolar, 1991; RuizDubreuil et al., 1992).

In general, behaviour of an organism is strongly influenced by environmental conditions Effect of different external factors on oviposition pattern has been investigated in various Drosophila species (Gruwez et al., 1971; Mckenzie, 1975; Ohnishi, 1977; Rockwell & Grossfield, 1978; Seiger & Sanner, 1983; Schnebel & Grossfield, 1986). Temperature plays an important role in oviposition behaviour of Drosophila species. It is severely restricted at low temperature (Mckenzie, 1975; Parsons, 1978; Schnebel & Grossfield, 1986). In India, certain Drosophila species are very common and behavioural studies on D. ananassae, D. bipectinata, D. malerkotliana and D. biarmipes have been reported by Singh and his coworkers (Singh & Chatterjee, 1986, 1988, 1989; Singh & Pandey, 1993, 1994; Srivastava & Singh, 1993a, b; Singh & Sisodia, 1995). Oviposition site preference has been studied in these species and intraand interspecies variations have been found (Srivastava & Singh, 1993a, b). Oviposition pattern in all these four species is also affected by light and dark conditions. Light condition is favourable to oviposition in these species (Srivastava & Singh, 1996).

During the present study, we conducted experiments to test the effect of temperature on oviposition pattern of these four species of Drosophila and results are reported in the present paper.

MATERIALS AND METHODS

To test the effect of temperature on oviposition pattern in D. ananassae, D. bipectinata, D. malerkotliana and D. biarmipes, two strains of each of the four species were used and experiments were conducted at three different temperatures (19°C, 24°C and 30°C). All the strains of D. ananassae, D. bipectinata and D. malerkotliana are mass culture stocks raised from females collected from different geographic localities. However, the two stocks of D. biarmipes are isofemale lines derived from two different localities. All these stocks have spent varying number of generations in the laboratory and are being maintained on simple culture medium in standard laboratory conditions. To study oviposition behaviour of females of these four species of Drosophila, simple culture medium containing agaragar, dried yeast, maize powder, brown sugar, nipagin, propionic acid and water was used. In order to facilitate the counting of eggs a green edible dye was added to the medium and a spot of active baker's yeast was placed in the centre of culture medium

Stocks were cultured and virgin females and males were collected. These flies were aged for two days in small batches. Five females and five males were kept in a food vial for two days for mating and then transferred without etherization to a food vial (8 cm length x 3 cm diameter) containing coloured food medium. Females were allowed to oviposit for 24 h and then transferred to another food vial. Number of eggs laid in the vial was counted. This was continued for four days. In each strain ten replicates (10 x 5 = 50 females) were made. The data of that vial in which any female died during the course of observation were rejected and thus the number of replicates varies in different species. Experiments were conducted in BOD incubator at 19°C, 24°C and 30°C temperatures and 12:12h L:D cycle.

Mean number of eggs/ /day was calculated for each strain and comparison was done between different temperatures by student's t-test.

RESULTS AND DISCUSSION

Results of experiments conducted to test the effect of temperature on oviposition in four species of Drosophila are shown in Table I and are depicted diagramatically in Figure 1. Females of all the four species laid low number of eggs at 19°C temperature as compared to higher temperature (24°C). All the strains showed more or less similar oviposition at 24°C and 30°C temperatures except one i.e. Ng strain of D. biarmipes in which number of eggs laid is higher at 24°C than that at 30°C. Comparison of mean number of eggs at three temperatures in all the four species has been done by means of student's ttest and the t values are given in Table II. The difference in the mean number of eggs between 19°C and 24°C is significant in all the species and thus oviposition is significantly reduced at lower temperature in all the four species tested. However, the difference in the mean number of eggs between 24°C and 30°C is not significant in all the four species (except Ng strain of D. biarmipes). Females of D. ananassae, D. bipectinata and D. malerkotliana laid significantly less number of eggs at 19°C as compared to 30°C but the difference in the mean number of eggs between 19°C and 30°C is not significant in D. biarmipes.

Thus it is evident from these results that oviposition is reduced at low temperature in all these four species of Drosophila which occur in India. The pattern of oviposition at different temperatures is similar in D. ananassae, D. bipectinata and D. malerkotliana which belong to the ananassae subgroup of the melanogaster species group. D. biarmipes which belongs to the suzakii subgroup of the melanogaster species group shows some variation from the remaining three species with respect to oviposition at 30°C temperature. Females of D. biarmipes oviposit significantly less number of eggs at 30°C as compared to 24°C.

Due to this reason, the difference in the mean number of eggs between 19°C and 30°C in D. biarmipes is not significant. This species also differs from the remaining three species with respect to the effect of different environmental factors on pupation site preference (Pandey & Singh, 1993).

In certain studies, various species of Drosophila including D. ananassae, which has been utilized during the present study have been used for the study of effect of temperature on oviposition (McKenzie, 1975; Parsons, 1978; Schnebel & Grossfield, 1986). In all these species, oviposition is severely reduced at low temperature. However, oviposition increases linearly between 1220°C in D. melanogaster and D. simulans (McKenzie, 1975; Parsons, 1978).

At 28°C, David & Clavel (1969) found less than one half of maximum daily egg production in D. melanogaster, Schnebel & Grossfield (1986) compared the oviposition temperature range in four Drosophila species triads from different ecological backgrounds and found differences in temperature range for oviposition of different species groups which reflects the group's ecological distribution.

This suggests that temperaturedependent oviposition may be important for the separation of these closely related species. Thus temperature is an important factor affecting oviposition in Drosophila because of limited physiological capabilities of the organism at low temperature.

Acknowledgements — Financial assistance is in the form of project fellowship to T. Srivastava from U.G.C. merged scheme of the Zoology Department, B.H.U. is gratefully acknowledged. We thank an anonymous reviewer for helpful comments on the manuscript.

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Publication Dates

• Publication in this collection
  06 July 2001
• Date of issue
  Aug 1998

History

• Accepted
  05 June 1998
• Received
  30 June 1997