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15 February 2016 Effects of heat stress on copulation, fecundity and longevity of newly-emerged adults of the predatory mite, Neoseiulus barkeri (Acari: Phytoseiidae)
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Abstract

Climate change predictions depict scenarios where arthropods will be more intensely and frequently exposed to extreme high temperatures. A short period of heat stress is unlikely to cause directly mortality but may modify population dynamics via impacting life history traits. In this study, the newly-emerged female and male adults of the predatory mite, Neoseiulus barkeri Hughes (Acari: Phytoseiidae) were exposed to 42 °C for 4 hours to investigate the heat effects on the copulation, longevity, fecundity and egg hatchability through parental effects of the mite. The results showed that after heat stress, the females had a markedly extended pre-oviposition period, shortened oviposition period, and reduced fecundity and longevity. At the meantime, when females mated with the heat stressed males, the pre-oviposition period was prolonged, the oviposition period was shortened and the fecundity was reduced. A sex-specific effect of short term heat exposure on mating behavior was further observed in males where copulation duration of the stressed individuals were somewhat prolonged. In addition, a trade-off between survival and reproduction was observed in heat stressed females. However, heat stress had no effects on immediate mortality, pre-copulation period, post-oviposition period, male longevity and egg hatchability of the progeny generations. Our results confirmed that heat stress had a detrimental effect on reproduction, particularly by delaying the onset of oviposition and reducing reproductive output and thereby influencing the population dynamics of N. barkeri.

Introduction

Phytoseiid mites (Acari: Phytoseiidae) are effective natural enemies of many phytophagous mites including Panonychus citri and Tetranychus urticae (Helle and Sabelis 1985; McMurtry and Croft 1997; McMurtry et al. 2013). As ectotherms, their body temperature is highly depend on ambient temperature. Previous studies had demonstrated that ambient temperature had significant impacts on predatory mites performance (e.g. functional response, mating, and oviposition behaviour), and ultimately fitness (e.g. developmental rate, lifespan, and fecundity) (Skirvin and Fenlon 2003; Nguyen and Amano 2009; Jafari et al. 2010; Jafari et al. 2012a; Xia et al. 2012; Wang et al. 2014). Currently, most thermal-related researches on predatory mites was typically conducted at a variety of constant temperatures, but seldom focused on a certain heat stress event. At extreme high temperatures, biological performance of the arthropod might be inhibited, and further sustained exposure can result in damage and injury that may eventually lead to death (Mironidis and Savopoulou-Soultani 2010; Roux et al. 2010; Liao et al. 2014).

It has been reported that heat stress for short term, i.e. several hours, can reduce longevity and fecundity of mites including Neoseiulus californicus (Yuan et al. 2015), P. citri (Yang et al. 2014), and Mononychellus mcgregori (Lu et al. 2014). Heat stress experienced at parental generation in certain species can decrease egg hatchability in their offspring generation T. turkestani and T. truncatus (Yang et al. 2013), T. Viennensis (Li et al. 2010), M. mcgregori (Lu et al. 2014), and Plutella xylostella (Zhang et al. 2013). Heat stress can suppress mating success in some insect species, Aphidius colemani (Jerbi-Elayed et al. 2015) and Cnaphalocrocis medinalis (Liao et al. 2014), and also can extend pre-copulation period in P. xylostella (Zhang et al. 2013). Other studies suggested that high temperature exposure have a positive effect on longevity and fecundity in Drosophila species (Hercus et al. 2003; Scannapieco et al. 2007), as well as in spider mite T. viennensis (Li et al. 2010). Moreover, sex-specific effects of heat stress on fecundity, viability and the developmental rates were also reported in several arthropods (Roux et al. 2010; Janowitz and Fischer 2011; Zhang et al. 2013). Females were found to be less sensitive to heat stress than males (Roux et al. 2010), due to the differential genes expression of heat shock proteins in females (Sørensen et al. 2007; Chen et al. 2015). Therefore, heat stress is critical for reproductive fitness and affects population dynamics via impacting life history traits.

Neoseiulus barkeri Hughes (Acari: Phytoseiidae), a generalist predator that feeds on spider mites (Fan and Petitt 1994a; Jafari et al. 2010), broad mites (Fan and Petitt 1994b), storage mites (Xia et al. 2012; Li et al. 2015), small arthropods and pollens (Bakker and Sabelis 1989; Nomikou et al. 2001; Wu et al. 2015), is considered as a good biological control agent and has been widely applied in citrus orchards targeting on citrus red mites P. citri (Wu et al. 1997; Xu and Wang 2007). It has been reported that the optimal temperature for N. barkeri development was estimated at 24.5 °C (Jafari et al. 2012b), and this mite could develop successfully and propagate with a high fecundity rate over a broad range temperatures of 24–32 °C (Xia et al. 2012). For most citrus growing areas, summer temperature may reach 40 °C or even higher and last for a few hours. Such scenarios may affect their population dynamics and generate failures in biological control of spider mites (Montserrat et al. 2013a, b). Moreover, the frequency and magnitude of extreme heat event will increase with global warming (IPCC 2014), which increase the exposure of arthropods to heat events and therefore modifying population dynamics by impacting life history traits (Li et al. 2010; Roux et al. 2010; Liang et al. 2014; Yang et al. 2014; Yuan et al. 2015). However, there are only a few literatures that focus on short period of heat stress on mating behavior and the subsequent reproduction of N. barkeri or even in other Phytoseiid mites.

Therefore, we considered the following questions in this study: (1) how a short period of heat stress imposed on virgin adults affected their performance; (2) whether any effects were sex-specific, and (3) whether effects were carried over through the egg stage, resulting in parental effects. To answer these questions, we investigated the effects of a single heat stress at 42 °C for 4 h exposure on different aspects of adult performance: mating behavior, longevity, fecundity and egg hatchability through parental effects.

Materials and methods

Test mites

The stock culture of N. barkeri was purchased in 2010 from the Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, China. N. barkeri were fed with the flour mite, Aleuroglyphus ovatus on wheat bran in a 4 L translucent plastic boxes and placed in a climate-controlled room at 25 ± 1°C, 70–80 % RH, and a L:D = 14:10 photoperiod. The even-aged eggs (within 12 h) from the stock cultures were individually transferred onto a cowpea leaf arenas (2 cm in diameter; infected with the all stages of T. urticae at least for 3 days). The leaf arena was floating on a piece of round sponge (4.5 cm in diameter, and 0.5 cm in thick) and absorbent cotton (4 cm in diameter) that was soaked with distilled water in a Petri dish (5 cm in diameter). The sponges and absorbent cottons were kept soaked by daily addition of distilled water, and the leaf arenas were replaced every 4–5 days. The immature stages were maintained at 25 + 1 °C, 70–80 % RH, and L14:D10 photoperiod in a programmable temperature controller (Ningbo Southeast Instrument Co. Ltd., RDN-300B-4, China). The males and females of the newly-emerged adults (1–2 days old) were separated using a stereoscopic microscope and used for the following experiments.

Heat stress

Virgin female and male adults of N. barkeri were arbitrarily picked up from the culture and divided into two groups: one group was maintained at 25 °C and served as control, while the second group was stressed at 42 °C for 4 hours (heat stress treatment) and then placed back at 25 °C. The survival of the treated mite was checked immediately after heat stress, and each surviving mite was engaged in a single mating. To evaluate the heat stress on mating behavior, fecundity and longevity of females and males of N. barkeri, the mite from the two groups were mated in four cross experiments: (1) females and males both from control group (25♀/25♂); (2) females from the heat stress treatment group and males from control group (42♀/25♂); (3) females from the control group and males from the heat stress treatment group (25♀/42♂); (4) females and males both from the heat stress treatment group (42♀/42♂). Each experiment consisted of sixty pairs. Every 5, 10 or 20 minutes, we used a stereoscopic microscope to observe copulation duration for each mating pair placed on a leaf arena (2 cm in diameter; without prey) in a Petri dish. Observations ended at pair separation. After completion of copulation, female and male was separately transferred to leaf arenas (with abundant T. urticae as prey) and maintained at 25 °C for further investigations. Newly produced eggs were recorded daily and transferred onto another leaf arena to investigate egg hatchability. The surviving mites were monitored daily until female and male mite death in each experiment. Mites that escaped from the leaf arenas were excluded from the experiments.

Statistical analysis

The Kaplan-Meier method was used to analyze the survival curves of heat stressed females and males followed by log rank (Mantel-Cox) test (Lambrechts et al. 2011). Pre-copulation duration, copulation duration, pre-oviposition period, oviposition period, post-oviposition period, fecundity, longevity and arcsine square root transformed egg hatching rate among four paired groups were analyzed by one-way ANOVA (followed by LSD post-hoc tests, P < 0.05). In addition, to separate the effects of heat stress and the sexes on traits, two-way ANOVAs followed by LSD post-hoc tests were used with female and male temperature treatments as fixed factors. These analyses were performed with SPSS software (IBM SPSS Statistics 21, IBM Corporation, Somers, NY, USA).

Results

Mating behavior

Heat stress at 42 °C for 4 hours did not have an obvious effect on the pre-copulation period of N. barkeri (Tables 1, 2; F (3,232) = 0.382, P = 0.776), but resulted in a significantly prolonged copulation period (Tables 1, 2; F (3,232) = 10.153, P < 0.001). When control females (25♀) or heat stressed females (42♀) mated with the heat stressed males (42♂), copulation durations were extended by around 33 and 42 minutes in comparison to pairs with the males from the control groups (25♂) (Table 1).

TABLE 1.

Effects of heat stress (42 °C, 4 h) on mating behavior of virgin females and males of Neoseiulus barkeri; results in the format: Mean ± SE.

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TABLE 2.

Results of general linear models testing the effects of female and male temperature (25 °C versus 42 °C) on reproductive traits of Neoseiulus barkeri.

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Continued.

Results of general linear models testing the effects of female and male temperature (25 °C versus 42 °C) on reproductive traits of Neoseiulus barkeri.

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Periods of pre-oviposition, oviposition and post-oviposition

The pre-oviposition periods of N. barkeri were significantly prolonged by heat stress for a short term (Tables 2, 3). When the heat stressed females mated with the control males (42♀/25♂), and the control females mated with the heat stressed males (25♀/42♂), their pre-oviposition period were considerably extended to 1.37 and 1.71 days in comparison to control group (25♀/25♂) (Table 3;F (3,69)= 92.644, P < 0.001). There was a synergistic effect on this trait when two sexes were stressed to heat stress (42♀/42♂), with a significant extension of 6.26 days (Tables 2, 3).

TABLE 3.

Effects of heat stress on reproduction of Neoseiulus barkeri.

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The oviposition period in the heat stressed pairs tended to be shorter when heat stressed only in female (42♀/25♂, 21.00 days) or male (25♀/42♂, 19.89 days), or both (42♀/42♂, 17.94 days) than in the control pairs (25♀/25♂, 27.20 days) (Table 2,3;F (3,69) = 13.3 27, P < 0.001). There was also a synergistic effect on this trait when two sexes were stressed to heat stress. However, post-oviposition period among treatments was not affected by heat stress (Table 2, 3; F (3,69) = 1.386, P = 0.254).

Fecundity, longevity and egg hatchability

Females in control group (25♀/25♂) had the highest fecundity (35.55 ± 0.76 eggs/female), followed by treatments involving heat stress only on females (42♀/25♂: 28.65 ± 0.90 eggs/female), then males (25♀/42♂: 26.68 ± 1.11 eggs/female), and then both (42♀/42♂: 22.59 ± 1.59 eggs/ female) (Tables 2, 3; F (3,69) = 24.565, P < 0.001). However, egg hatchability was not affected by heat stress (Tables 2, 3; F3,115) = 0.230, P = 0.875), with an average of 96.78 ± 0.61 % eggs hatched successfully.

Females had a shorter longevity than males (F (1,147) = 13.856, P < 0.001), with mean (± SE) longevity across all treatment groups being 50.66 ± 1.01 days for females and 55.88 ± 0.98 days for males. When stressed at 42 °C for 4 hours, female mites (42♀/25♂) had a 14.99 % decreased longevity in comparison with the control group (Table 3; F (3,70) = 3.050, P = 0.034). On the other hand, there was no significant effect of heat stress on male longevity (Table 3; F (3,72) = 1.503, P = 0.221).

The age-specific survival of female lx (percentage of surviving females at the instant x) and age-specific fecundity rate mx (number of eggs laid per female per day), and the age-specific survival of male lx (percentage of surviving males at the instant x) of N. barkeri from the four cross combinations stressed at 42 °C for 4 h are shown in Figure 1 and 2, respectively. Survival curves of females were significantly different (Figure 1) according to log-rank tests (overall: χ2 8.394, df = 3, P = 0.039; 25♀/25♂ vs. 42♀/25♂: P = 0.013; 25♀/25♂ vs. 25♀/42♂: P = 0.040; 25♀/25♂ vs. 42♀/42♂: P = 0.495; 42♀/25♂ vs. 25♀/42♂: P = 0.273; 42♀/25♂ vs. 42♀/42♂:P = 0.084; 25♀/42♂ vs. 42♀/42♂: P = 0.246). On the contrary, survival curves of males did not differ significantly from one another (overall: χ2 = 3.860, df = 3, P = 0.277) (Figure 2).

FIGURE 1.

Effect of heat stress on the age-specific survival rate (lx) and age-specific fecundity (mx) in female adult of N. barkeri. Treatments involved different combinations of female and male exposure to 42 °C for 4 h. 25♀/25♂: females and males both from control group; 42♀/25♂: females from the heat stress treatment group and males from control group; 25♀/42♂: females from the control group and males from the heat stress treatment group; 42♀/42♂: females and males both from the heat stress treatment group. “N” refers to the number of indivduals.

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FIGURE 2.

Effect of heat stress on the age-specific survival rate (lx) in male adult of N. barkeri. Treatments were the same as Figure 1.

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Discussion

This study investigated the impacts of a single extreme heat event (42 °C, 4 h) on the performance of newly-emerged adults of N. barkeri as well as the consequences for egg hatchability in progeny generation. Adult stage was tested in this study because heat stress experienced at which might cause greater detrimental effects on reproduction than other developmental stages (Li et al. 2010; Zhang et al. 2015).

Mating and egg laying behavior in N. barkeri begin only after the copulation, and females require multiple mating to produce the maximum fecundity (Momen 1993; Pappas et al. 2007; Gotoh and Tsuchiya 2008). Males recognize females by direct contact and show an initiative behavior in copulation (Pappas et al. 2005). No difference in pre-copulation duration among different treatments indicated that the mobility of the heat stressed N. barkeri was not affected by short term heat stress. Previous study reported that copulation duration of N. barkeri was on average of 285 minutes at 27– 29 °C (Momen 1993), which was a little shorter than our result of 293 minutes at 25 °C. The difference may be partly a result of different ambient temperature for the reason that temperature at the time of mating strictly determined copulation duration (Nguyen and Amano 2010). In addition, the sex-specific extended copulation duration in heat stressed males indicated that spermatophore transfer rate might be transiently inhibited after heat stress (Liao et al. 2014).

The prolonged pre-oviposition period, reduced oviposition period, longevity and total fecundity in heat stressed female adults suggested that heat stress could reduce their longevity and fecundity (Yang et al. 2014; Yuan et al. 2015). However, our result was different from the unaffected or even increased fecundity in heat stressed T. turkestani (Yang et al. 2013) and T. viennensis (Li et al. 2010). We concluded that the different heat shock response might be one of the reasons for outbreaks of some Tetranychus mites under hot and dry conditions (Montserrat et al. 2013a). On the other hand, heat stress also had negative effects on male fertility rather than longevity. Our study clearly indicated that the survival curves females were significantly affected by heat stress, especially when 25♀/25♂ vs. 42♀/42♂, which suggested that there might be a trade-off between longevity and reproduction (Speakman and Garratt 2014; Travers et al. 2015). Considering the longer longevity observed in males and the significant reduced longevity observed in heat stressed female adults in this study, we considered that female mites were more sensitive to heat stress than male mites on a life span scale, which is different the result of previous study in insects or mites (Sørensen et al. 2007; Roux et al. 2010; Chen et al. 2015).

The reduced fitness after heat stress could be attributed to several different aspects, including direct mortality and damage (Mironidis and Savopoulou-Soultani 2010; Liao et al. 2014), inhibition of prey consumption (unpublished data), male fertility (David et al. 2005; Nguyen et al. 2013; Chirault et al. 2015), as well as oxidative stress (Yang et al. 2010; Lu et al. 2014; Zhang et al. 2014). Chirault et al. (2015) reported that heat stress could cause a delay in spermatogenesis during development and a significant decrease in sperm stock at male adult emergence. In this study, the process of oogenesis and spermatogenesis in heat stressed N. barkeri must have been complete, because each tested individual had capacity to lay eggs and almost all eggs hatched successfully. Therefore, spermatophores and oocytes were most likely to be damaged, which might cause a significantly reduced fecundity, especially when females and males were stressed together. However, there is no powerful evidence that could testify this hypothesis, which needs further investigations. Previous studies indicated that the quantity of spermatophores and/or seminal fluids transferred by males could reduce female egg production in some insect species (Katsuki and Miyatake 2009; Chirault et al. 2015). Although reduced fecundity were observed, there was no negative impact on egg hatchability via a parental effect manner that had reported in some other mites or insects (Li et al. 2010; Yang et al. 2013; Zhang et al. 2013; Liang et al. 2014).

We confirmed that such a short term heat stress did have negative effects on the performance of N. barkeri. Female adults were more susceptible to heat stress than male adults owing to the significantly reduced fitness in fecundity and longevity. Heat stress had no impact on male longevity or on the later repercussions for their progeny. Biological control of pest mites in orchards and greenhouses using phytoseiid mites has been considered as a key strategy for the integrated pest management program (Niu et al. 2014; Zalucki et al. 2015). However, many studies have indicated that natural enemies have lower tolerance to higher temperature than their prey (Roy et al. 2003; Stavrinides et al. 2010; Ozawa et al. 2012; Coombs and Bale 2013; Montserrat et al. 2013b). High temperature is usually accompanied with low air humidity. Hot and dry weather create favorable condition for the seasonal outbreaks of pest mites in orchards, but demote predatory mite abundance, which might cause a direct disruption of biological control in agro-ecosystems (Montserrat et al. 2013a). Therefore, more immediate actions should be taken to enhance biological control efficiency such as selecting low humidity and high temperature resistant strains of phytoseiid mites.

Acknowledgements

We thank two anonymous referees for their helpful comments and suggestions on the manuscript. This study was supported by the Fundamental Research Funds for the Central Universities (XDJK2015D018, XDJK2014C097), National Public Benefit Industry (Agriculture) Research Projects, the Ministry of Agriculture, (200903032) and Chongqing Postdoctoral Science special Foundation (Xm2014047).

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© Systematic & Applied Acarology Society
Guo-Hao Zhang, Ya-Ying Li, Kai-Jun Zhang, Jin-Jun Wang, Yi-Qing Liu, and Huai Liu "Effects of heat stress on copulation, fecundity and longevity of newly-emerged adults of the predatory mite, Neoseiulus barkeri (Acari: Phytoseiidae)," Systematic and Applied Acarology 21(3), 295-306, (15 February 2016). https://doi.org/10.11158/saa.21.3.5
Received: 26 August 2015; Accepted: 1 December 2015; Published: 15 February 2016
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