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The indirect influence of potential mates on survival and reproduction of Tyrophagus curvipenis (Acari: Acaridae)

Published online by Cambridge University Press:  03 June 2024

Guang-Yun Li
Affiliation:
Key Laboratory of Entomology and Pest Control Engineering, College of Plant Protection, Southwest University, Chongqing 400715, People's Republic of China
Wendy Lam
Affiliation:
Centre for Biodiversity and Biosecurity, School of Biological Sciences, The University of Auckland, Auckland 1072, New Zealand Manaaki Whenua – Landcare Research, Private Bag 92170, Auckland, New Zealand
Zhi-Qiang Zhang*
Affiliation:
Centre for Biodiversity and Biosecurity, School of Biological Sciences, The University of Auckland, Auckland 1072, New Zealand Manaaki Whenua – Landcare Research, Private Bag 92170, Auckland, New Zealand
*
Corresponding author: Zhi-Qiang Zhang; Email: [email protected]
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Abstract

The social-sexual environment is well known for its influence on the survival of organisms by modulating their reproductive output. However, whether it affects survival indirectly through a variety of cues without physical contact and its influence relative to direct interaction remain largely unknown. In this study, we investigated both the indirect and direct influences of the social-sexual environment on the survival and reproduction of the mite Tyrophagus curvipenis (Acari: Acaridae). The results demonstrated no apparent influence of conspecific cues on the survival of mites, but the survival and reproduction of mated female mites significantly changed, with the females mated with males having a significantly shortened lifespan and increased lifetime fecundity. For males, no significant difference was observed across treatments in their survival and lifespan. These findings indicate that direct interaction with the opposite sex has a much more profound influence on mites than indirect interaction and highlight the urgent need to expand research on how conspecific cues modulate the performance of organisms with more species to clarify their impacts across taxa.

Type
Research Paper
Creative Commons
Creative Common License - CCCreative Common License - BY
This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution and reproduction, provided the original article is properly cited.
Copyright
Copyright © The Author(s), 2024. Published by Cambridge University Press

Introduction

Animals exhibit phenotypic plasticity in diverse social environments, especially ones involving their conspecifics. In response to the social context, they often demonstrate behavioural changes, which modify their survival and reproduction (Morgan et al., Reference Morgan, Andreassen, Åsheim, Finnøen, Dresler, Brembu, Loh, Miest and Jutfelt2022). These changes can be adaptive or maladaptive, ultimately influencing the ecological success of individuals and populations (Forsman, Reference Forsman2015). For example, animals may adjust their aggression levels or mating strategies based on the presence or absence of competitors or potential mates. These adaptations can enhance an individual's chances of survival and reproduction (Cremer et al., Reference Cremer, Schrempf and Heinze2011; Tolvanen et al., Reference Tolvanen, Kivelä, Doligez, Morinay, Gustafsson, Bijma, Pakanen and Forsman2020).

Extensive studies have shown that the social environment changes the behaviour, alters the physiology and shifts the life-history strategy of organisms across a wide range of taxa (Carvalho et al., Reference Carvalho, Kapahi, Anderson and Benzer2006; Rush et al., Reference Rush, Sandver, Bruer, Roche, Wells and Giebultowicz2007; Travers et al., Reference Travers, Garcia-Gonzalez and Simmons2015; Liu and Hao, Reference Liu and Hao2019; Garratt et al., Reference Garratt, Try, Smiley, Grattan and Brooks2020; Kohlmeier et al., Reference Kohlmeier, Zhang, Gorter, Su and Billeter2021) through intra- and inter-sexual interactions. For example, a recent study reported that the male fruit fly, Drosophila melanogaster, shifted reproductive behaviour according to the intensity of competition. When housed with other competitors, they prolonged their mating duration and transferred much larger ejaculates than males housed alone (Filice et al., Reference Filice, Bhargava and Dukas2020). Furthermore, females mated with males housed with rivals laid more eggs in their early life but few eggs in later life, and showed reduced lifespan (Filice et al., Reference Filice, Bhargava and Dukas2020). The social environment has also been well documented to reduce immune function and alter digestive processes through mating, which is the most common process being social interaction (McKean and Nunney, Reference McKean and Nunney2001; Rolff and Siva-Jothy, Reference Rolff and Siva-Jothy2002; White et al., Reference White, Bonfini, Wolfner and Buchon2021). Social interaction, one of the most important biotic factors, is now well known for its tremendous influence on many aspects of animals' fitness (Boulay et al., Reference Boulay, Quagebeur, Godzinska and Lenoir1999; Koto et al., Reference Koto, Mersch, Hollis and Keller2015).

Over the past few years, we have gained much knowledge about how social context influences the fitness of organisms through direct physical interaction. However, relatively few research projects have been devoted to the consequences of perceiving cues from conspecifics without any direct contact. Recently, there has been emerging evidence that many organisms can detect various types of stimulation from conspecifics, including visual, auditory, olfactory and chemical cues (Mokany and Shine, Reference Mokany and Shine2003; Mcleman et al., Reference McLeman, Mendl, Jones, White and Wathes2005; Poschadel et al., Reference Poschadel, Meyer-Lucht and Plath2006; Wijenberg et al., Reference Wijenberg, Takács, Cook and Gries2008; Lecchini et al., Reference Lecchini, Peyrusse, Lanyon and Lecellier2014). These perceived cues can trigger behavioural and physiological changes, ultimately determining the organism's short-term or long-term fitness. In model organism rats, males fed ad libitum reduced anxiolytic-like behaviour when exposed to olfactory cues from male mice under 25% calorie restriction (Abbott et al., Reference Abbott, Kent, Levay, Tucker, Penman, Tammer and Paolini2009). More interestingly, the perception of conspecific cues even regulated the long-term fitness traits of fruit flies and mice. Fruit flies avoided the side of the T-maze containing a group of flies infected with the lethal pathogen Pseudomonas aeruginosa 24–48 h earlier. Moreover, when the fruit flies were chronically exposed to dead conspecifics, their lifespan decreased significantly, a finding that was robust for all experimental strains (Chakraborty et al., Reference Chakraborty, Gendron, Lyu, Munneke, DeMarco, Hoisington and Pletcher2019). In mice, compared with females exposed to water, female mice exposed to odours from adult females from the 3rd day to the 60th day old had a longer lifespan (Garratt et al., Reference Garratt, Erturk, Alonzo, Zufall, Leinders-Zufall, Pletcher and Miller2022).

Although there is evidence that cues from the social environment can be successfully perceived and profoundly influence animals, how the cues of conspecifics shape the long-term fitness of animals is still little known. A few previous studies only addressed mating and reproductive success in response to sexual perception, one of the major fitness traits of adults, but neglected survival and lifespan (Corbel et al., Reference Corbel, Londoño-Nieto and Carazo2022a, Reference Corbel, Serra, García-Roa and Carazo2022b), both of which are also of critical importance. Furthermore, lifespan and reproduction were reported to be associated with each other, and sometimes trade off under energy limitations in much life-history research. Therefore, measuring both of these traits is of particular interest and may enhance our understanding of the fitness consequences of social interaction. Also, up till now, research in this field has focused on model organisms, including nematodes, fruit flies and mice. No comparative studies have been conducted on non-model organisms, to the best of our knowledge. Thus, whether this profound influence is common for animals is largely unknown.

In this study, we aim to investigate how interaction with the opposite sex affects long-term fitness traits in a non-model species, Tyrophagus curvipenis, through direct and indirect interaction via sensory perception. Previous studies on immature life-history traits showed that this species has three developmental stages, including larval, protonymphal and tritonymphal, but without the deutonymphal stage, ranging from 10 to 25 days depending on the food source (Ye and Zhang, Reference Ye and Zhang2014). To clarify the effect of direct interaction with the opposite sex on the fitness of mites, we exposed adult females to males of the same age to allow for insemination. The influence of cues from the opposite sex without physical contact was explored by isolating the mites from the opposite sex with a fine mesh so that they could perceive cues by olfaction, while the mites in the control group were kept individually. If the opposite sex has any influence, both directly and through indirect cues, it was predicted that, compared with the control, the mites will have different lifespans and reproduction in response to socio-sexual cues.

Materials and methods

Mite rearing

The mite species used was first collected from capsicum leaves in the greenhouse of Manaaki Whenua – Landcare Research, Auckland, New Zealand. It was identified by Professor Qing-Hai Fan from the Ministry for Primary Industries as T. curvipenis. The population has been established in our laboratory since 2012 (Ye and Zhang, Reference Ye and Zhang2014) and is sustained with dry yeast (Saccharomyces cerevisiae, produced by Goodman Fielder Limited, New Zealand), a common product used in bakery. The mites and yeast were placed on a black plastic sheet (about 12 cm in diameter) over a wet sponge inside a Petri dish (15 cm in diameter), which is put into a box with sponge. The box was filled with water regularly to keep the sponge wet and prevent mites from escaping. This rearing container was kept at 25 ± 1°C, with a relative humidity of 65–75% and a photoperiod of 16L:8D.

Experimental cells

The experimental cell is a cylinder hole with its top 6 mm in diameter and bottom 3 mm in diameter in plexiglass slides (38 mm in length, 25 mm in width and 3 mm in thickness). The cell was covered on each side with a transparent plastic sheet to facilitate observation, and fixed with two metal clips. The experimental cell was modified from Ye and Zhang (Reference Ye and Zhang2014).

Preparations for experiment

To obtain mites of the same age, females from the laboratory population were collected, fed with yeast and allowed to lay eggs. Twenty-four hours later, the females were removed and these newly produced eggs were allowed to develop. They were kept one mite per cell during development. On the 10th day, their sex was determined and they were randomly assigned to different treatments. The sex of the mites was determined by checking the ventral and genital shields under a dissecting microscope.

Experimental procedures

Four treatments were set up to determine the influence of mating and the possible fitness consequence of sexual perception (fig. 1). In the first treatment, the males and females were kept virgin and one mite per cell throughout their lives (single). In the second treatment, the virgin females and virgin males were kept in different cells side-by-side with a fine mesh isolating them, so that they could perceive the presence of the opposite sex via visual or olfactory cues but did not have any physical or sexual interactions (isolated). In the third treatment, the virgin male and virgin female were paired and kept together until dead, so they were allowed to mate frequently (mated together). In the last treatment, the male and female were kept together and allowed to mate for 24 h, after which they were separated into different cells and received the same treatment as that in treatment 1 until death (mated for 1 day). The survival of each individual and the number of eggs produced by females were checked every day until all the mites were dead. If one mite in a pair (focal mite) was lost or dead accidently, a mite from the lab population of the opposite sex was introduced to ensure the focal mite were still under the treatment as before. However, the newly introduced mites were not included in the data collected. This replicated experiment had a sample size that ranged from 44 to 21 for each treatment and sex, respectively.

Figure 1. Schematic diagram of the experimental procedures.

Data analysis

The survival data were fitted in the Cox proportional hazard model to see how multiple variates and covariates modulate this parameter. In this model, we evaluated the influence of two main factors, mating regimes and sex, with block as a covariate. The covariate did not significantly influence survival, indicating no real difference between these three blocks, so it was removed from the following analysis. The Kaplan–Meier survival analysis was performed to further explore the effects of each factor, including treatment and sex. The survival analyses were conducted with R packages ‘survival’ and ‘survminer’. The lifespan of mites in each social environment was analysed with two-way ANOVA, with treatment and sex as the main factors. The differences in lifespan among the four treatments were compared with TukeyHSD, and the sex-specific difference in each treatment was compared using t-test.

In our experiment, only females in two treatments produced eggs: those kept with males throughout life and those kept with males for 24 h and then separated. Lifetime reproduction (all the eggs produced by each female) was first checked for normality by Shapiro–Wilk's method with R function shapiro.test, since it meets the assumption of normality. An unpaired two-sample t-test was conducted to compare the difference between these two groups with R function t-test. The relationship between reproduction and adult lifespan was first explored for all females in this study with linear regression, and was then analysed for the females mated with males for their lifetime and females mated for 1 day, respectively. The difference in slope between these two treatments was compared with a t-test with R package ‘lsmeans’ (Lenth et al., Reference Lenth, Lenth and Matrix2015). Data analyses were carried out and visualised using R version 4.0.0 (R Core Team, Reference R Core Team2020).

Results

No significant effect of blocks on the survival rates (Z = −0.961, P = 0.337) was observed, so the data in each block were pooled. The survival of females and males differed significantly, with males living longer than females (Z = 2.274, P = 0.023; fig. 2A). The mated females kept together with a male for their whole life showed dramatically lower survival rates than the females kept singly, isolated and mated for 1 day (χ2 = 25.6, P < 0.001), but females in the later three treatments did not show any differences from each other (all P > 0.05). The social context did not have a significant effect on the survival of males across treatments (χ2 = 6, P = 0.1; fig. 2B).

Figure 2. Survival plots of female (A) and male (B) mites Tyrophagus curvipenis in four different social contexts: single, isolated, mated together, mated for 1 day.

Since no block effects on lifespan were detected (F 2,215 = 0.935, P = 0.394), data from three blocks were pooled. Significant effects of treatment (F 3,210 = 8.099, P < 0.001) and sex (F 1,210 = 7.485, P = 0.007) on lifespan were demonstrated, without interactions between them (F 3,210 = 0.896, P = 0.444; fig. 3). By comparing the mean lifespan of mites across four treatments, it was found that mites mated together for their whole life showed an obviously shorter average adult lifespan than mites in the other treatments. The female mites that were single and isolated did not differ in adult lifespan from the males in the same treatments (t 1,64 = −1.3044, P = 0.1968; t 1,51 = −0.15557, P = 0.877; fig. 3), while females mated for 1 day showed a marginal difference from males, and females mated together for their whole life showed a profound difference from males (t 1,45 = −1.8133, P = 0.076; t 1,50 = −2.1466, P = 0.037; fig. 3).

Figure 3. The adult lifespan of female and male Tyrophagus curvipenis in four different social contexts: single, isolated, mated together, mated for 1 day. Data are shown as mean ± SE in days.

The females allowed to mate with males for their whole life laid 61% more eggs than those that mated for only 1 day, and this difference was significant (t = 3.670, P < 0.001; fig. 4). For the former, the females with a longer life span produced more eggs, indicating a significant positive relationship (F 1,18 = 11.4, P = 0.003; fig. 5). For the latter, no apparent linear relationship between adult lifespan and lifetime fecundity was found (F 1,21 = 0.207, P = 0.653; fig. 5). Moreover, the difference between these two treatments was significant (t 1,39 = 3.051, P = 0.004; fig. 5).

Figure 4. Violin plot of lifetime fecundity for female mites Tyrophagus curvipenis mated with males together throughout life and females mated with males for only 1 day.

Figure 5. Correlations between adult lifespan and lifetime fecundity of female mites Tyrophagus curvipenis mated with males throughout life and females mated with males for only 1 day.

Discussion

This study investigated the indirect and direct influences of social-sexual environment on the long-term fitness of the mite T. curvipenis. The results showed there was no significant difference in survival rate and lifespan between mites kept singly and those kept isolated but exposed to cues of the opposite sex, indicating that cues of the opposite sex did not shift the life-history strategy of adults. We also showed that direct sexual interaction – mating and housed together with males – shortened the lifespan but increased the lifetime fecundity of female mites. In contrast, the adult lifespan of males was not influenced when they mated with females.

Indirect influences of social-sexual environment

Organisms can employ a wide range of cues to perceive the environment they are exposed to and adjust their behaviour and physiology to adapt. In Acari, many species have been reported to be capable of receiving biotic cues from their prey, predators, competitors and conspecifics and show responses to these cues (Azandémè-Hounmalon et al., Reference Azandémè-Hounmalon, Torto, Fiaboe, Subramanian, Kreiter and Martin2016; Schausberger et al., Reference Schausberger, Gratzer and Strodl2017; Li and Zhang, Reference Li and Zhang2019a; Gu et al., Reference Gu, Li and Zhang2022a, Reference Gu, Zhang and Zhang2022b; Wei et al., Reference Wei, Li and Zhang2023). It is generally accepted that the species in this class evolved to identify vibratory and olfactory cues despite their limited visual perception. This study found that the adult mite T. curvipenis exposed to cues of the opposite sex did not show a significant difference in survival and lifespan compared with their counterparts kept single, indicating that neither females nor males were affected by the cues of the opposite sex. This was partially in line with a study on the Mediterranean flour moth (Ephestia kuehniella, Esfandi et al., Reference Esfandi, He and Wang2015), in that the survival of males was not affected by stimuli of additional females. However, it conflicts with results from the model species fruit fly (D. melanogaster): Gendron et al. (Reference Gendron, Kuo, Harvanek, Chung, Yew, Dierick and Pletcher2014) reported that male flies exposed to female donor pheromones exhibit a shorter lifespan than flies exposed to male donor pheromones. This study proposed that the perception of sexual characteristics may modulate the health and lifespan of conspecifics by affecting a set of molecular processes.

The divergence among these studies might have resulted from differences in the experimental set-up. In the non-model species (mites and moths), the cues of conspecifics were generated by exposing the focal ones to cues without any physical contact by separating them with a mesh. However, the focal flies were housed with pheromone-donor flies in the same cage, which allowed homosexual interactions among flies. Previously, it was documented that male fruit flies displayed homosexual courtship and aggressive behaviours, with frequency, intensity and directionality varying according to their experience (Svetec and Ferveur, Reference Svetec and Ferveur2005). These behaviours were already proven to influence the survival of males in many insects and mites (Maklakov and Bonduriansky, Reference Maklakov and Bonduriansky2009; Stojković et al., Reference Stojković, Jovanović, Tucić and Tucić2010; Benelli et al., Reference Benelli, Gennari, Francini and Canale2013; Li and Zhang, Reference Li and Zhang2021b).

Although both this study and the previous study with moths (Esfandi et al., Reference Esfandi, He and Wang2015) provide evidence that males do not have a survival cost when exposed to cues of the opposite sex, behavioural changes and reproductive success were significantly affected by cues from females. Specifically, Mediterranean flour moth (E. kuehniella) males that perceived auditory stimuli from females exhibited intense sexual flirtation behaviour and shortened mating duration (Esfandi et al., Reference Esfandi, He and Wang2015). Their lifetime fecundity was decreased as a result of reduced lifetime copulation frequency. Nevertheless, it was found that perception of female cues increased mating duration but did not affect the other behavioural traits of male flies, including mating latency, which determines the short-term fitness of males (Corbel et al., Reference Corbel, Serra, García-Roa and Carazo2022b). Furthermore, it was reported that short-term exposure to female cues increased male relative lifetime reproductive success in a competitive environment. In contrast, extended exposure to female cues decreased it (Corbel et al., Reference Corbel, Londoño-Nieto and Carazo2022a).

This research with different species differed in behavioural response to female cues, but it was in line with the finding that lifetime reproductive success is negatively influenced when males are exposed to female cues for a long period. This reproductive cost can be attributed to their great devotion to pre-copulatory behaviour. The flour moth has wing-fanning behaviour, which is energy intensive and considered costly for males. Also, there is evidence that the wing-fanning duration of males exposed to cues from five additional females was 5–8 times longer than that exposed to cues from five additional males and none (Esfandi et al., Reference Esfandi, He and Wang2015). Higher activity was also elicited as a response to female cues in fruit flies (Gendron et al., Reference Gendron, Kuo, Harvanek, Chung, Yew, Dierick and Pletcher2014).

Direct influences of social-sexual environment

When females were allowed to have direct contact with males, they initiated reproduction after mating, suggesting that fertilisation is necessary for reproduction for this species, and it reproduces sexually. Moreover, compared with females that mated for 1 day, the females mated all their life produced many more eggs, proving that sperm acquired in one day is not enough to inseminate all eggs throughout the life of a female, and re-mating is necessary to obtain more sperm for insemination in later life. Also, the females mated with males showed a much shorter lifespan than males, indicating that the socio-sexual environment significantly modified sex difference in lifespan. This finding was consistent with the notion that mating is costly for females (Fowler and Partridge, Reference Fowler and Partridge1989; Ueyama and Fuyama, Reference Ueyama and Fuyama2003; Rodrigues et al., Reference Rodrigues, Figueiredo, Van Leeuwen, Olivieri and Magalhães2020; Li and Zhang, Reference Li and Zhang2021a, Reference Li and Zhang2021b). The decreased lifespan of females mated with males can result from their higher investment in egg production (Harshman and Zera, Reference Harshman and Zera2007) given that they produce significantly more eggs than their counterparts that were not mated or only mated for 1 day. However, we cannot exclude the possibility that the reduction in lifespan is due to seminal factors because there is evidence that sterile females of D. melanogaster showed decreased lifespan after mating (Ueyama and Fuyama, Reference Ueyama and Fuyama2003).

The two crucial life-history traits – lifespan and reproduction of females mated – showed a significant positive relationship: with the increase of adult lifespan their lifetime fecundity showed an increasing trend, similar to another species of spider mite, Tetranychus urticae (Li and Zhang, Reference Li and Zhang2019b). However, no apparent association was found for mites mated for 1 day. This is in line with a study on a closely related species Tyrophagus putrescentiae (Wei et al., Reference Wei, Li and Zhang2023). These studies contribute to the accumulating evidence that the life-history trade-off between adult lifespan and reproduction is not universal (Jasienska, Reference Jasienska2009).

In conclusion, this study demonstrated that the social-sexual environment profoundly influences the life-history traits of female mites through direct interaction – mating. In contrast, indirect interaction and perceived cues of conspecifics have no influence on mite survival and reproduction. It seems that some insects and mites show different responses to conspecific cues. It is possible that the divergent responses of the animals across taxa may result from differences in their degree of sociality. Given that work on this topic has focused on model species up to now, further research on animals across taxa, including both solitary and social insects, would be of great importance to generalise the potential influence of socio-sexual environment, and expand our understanding of how indirect social interactions, such as phenotypic plasticity in response to conspecific cues, modulate the fitness of different organisms.

Acknowledgements

We thank Ray Prebble (Manaaki Whenua – Landcare Research) and the anonymous reviewers for their comments, which improved the manuscript. Zhi-Qiang Zhang was supported in part by New Zealand Government core funding for Crown Research Institutes from the Ministry of Business, Innovation and Employment's Science and Innovation Group.

Author contributions

Z.-Q. Z. conceived the idea and designed the experiment. W. L. and G.-Y. L. carried out experiments and collected data. G.-Y. L. conducted statistical analysis and drafted the manuscript. All authors discussed the analyses and results, contributed to the writing and approved the final manuscript.

Competing interests

None.

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Figure 0

Figure 1. Schematic diagram of the experimental procedures.

Figure 1

Figure 2. Survival plots of female (A) and male (B) mites Tyrophagus curvipenis in four different social contexts: single, isolated, mated together, mated for 1 day.

Figure 2

Figure 3. The adult lifespan of female and male Tyrophagus curvipenis in four different social contexts: single, isolated, mated together, mated for 1 day. Data are shown as mean ± SE in days.

Figure 3

Figure 4. Violin plot of lifetime fecundity for female mites Tyrophagus curvipenis mated with males together throughout life and females mated with males for only 1 day.

Figure 4

Figure 5. Correlations between adult lifespan and lifetime fecundity of female mites Tyrophagus curvipenis mated with males throughout life and females mated with males for only 1 day.