Doru luteipes
Creators: name: Pacheco, R. C.
name: Silva, D. D.
name: Mendes, S. M.
name: Lima, K. P.
name: Figueiredo, J. E. F.
name: Marucci, R. C.
Publisher: name: Zenodo
Year: 2023
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Dermaptera
Forficulidae
Doru
Doru luteipes

description: Doru luteipes
nymphs (up to 48 hours old) were individualized in plastic containers (500 mL) with artificial shelter formed by semitransparent polypropylene straw (10 cm long and 0.8 cm in diameter), sealed at one end with cotton, moistened cotton, and paper cup (3 cm) as a container for food. The containers were sealed with voile fabric and kept under controlled conditions at 25 ± 2 °C, 70 ± 10% RH, and 12h photophase. The treatments consisted of five food sources 1- uredospores of P. polysora; 2- S.frugiperda eggs; 3- uredospores of P. polysora + eggs of S. frugiperda; 4- corn pollen, and 5- artificial diet (control). Twenty-five repetitions per food source were used, and each individual was considered as one repetition. The survival assessment was carried out until the adult stage was reached.
2.5. Does D. luteipes’ food preference vary between nymphs and adults, and feeding times?
In order to determine the food preference among various food sources commonly found in maize, nymphs, and adults of D. luteipes were used in a chance of choice test with 1- eggs of S. frugiperda, 2- corn pollen, 3- uredospores of P. polysora, and 4- artificial diet. Nymphs and adults of D. luteipes fasting for 24 and 48 hours were kept in glass test tubes, with cylindrical bottom, containing moistened cotton to evaluate the insect’s food choice. After each starvation period, the insect was released in the center of a plastic container (500 mL) with the four food sources in paper cups (3 cm) arranged equidistantly from each other. For 10 minutes, the chosen food and the feeding time were determined using a stopwatch. The tests were performed during the daytime, between 1 pm and 5 pm and at night, between 7 pm and 10 pm. The biossay was replicate 20 times, and one individual of D. luteipes was used in each replicate.
2.6. Statistics
The nymph survival data were submitted to Kaplan-Meier analysis using the Software R version 3.6.0 (R Core Team, 2019). Data regarding the duration of the early developmental stage and percentage of nymph survival concerning the assumptions of normality of errors and homogeneity of variances were subjected to analysis of variance (ANOVA) and the means compared by the Tukey test at 5% probability. The Fisher exact test was used for association data between the food choice according to the developmental stage, and for the case in which the frequency was less than five. To verify differences between every two combinations, the Chi-Square post hoc test was used at a significance level of 0.05, and the Kruskal-Wallis non-parametric test was performed (p <0.05) was performed to compare the chosen feeding time and food choice.
3. Results
The logrank test shows that there is a significant difference between at least two survival curves (P <0.001). Then, a multiple comparison analysis based on the logrank test was performed to verify the existence of a difference between the treatments (Figure 1).
The S. frugiperda egg-based diet provided the lowest survival rate (P <0.001), and consequently, the number of nymphs developing into adults was significantly lower compared to nymphs fed with the other three food sources (Figure 1, Table 1).
The exclusive feeding on corn pollen led to a lower number of surviving nymphs compared to those fed with the artificial diet (P = 0.00379), uredospores (P = 0.00169), and eggs + uredospores (P = 0.00169) (Figure 1, Table 1).
The monotrophic diet with P. polysora uredospores extended the duration of the instar stages and consequently increased the period of the early stage. In general, the survival was diminished for nymphs that exclusively fed on eggs, uredospores, and pollen (Table 1).
In the diet composed exclusively of S. frugiperda eggs, the survival was low, with only 8% of insects reaching the adult phase (Table 1). However, the combination of S. frugiperda eggs + P. polysora uredospores contributed to maintaining the survival of D. luteipes in 58%, which was similar to the control treatment (Table 1).
*Averages followed
by the same letter on the line do not differ by Tukey’s test at 5% probability.Developmental Stage1oinstar 2oinstar 3oinstar 4oinstar AdultFood Sources24 h48 h24 h48 h24 h48 h24 h48 h24 h48 hControl 19.0 21.7 23.8 13.0 0.0 21.7 14.3 13.0 42.8 30.4P.polysora24.3 20.0 13.5 32.0 21.6 16.0 21.6 12.0 18.9 20.0S.frugiperda18.2 30.7 18.2 30.1 27.3 0.0 9.1 30.0 27.3 7.7 Pollen 16.2 15.4 25.8 12.8 29.0 28.2 25.8 25.6 3.2 17.9
*p ≤ 0.05.
The exclusive diet with maize pollen by the first and second instars of D. luteipes provided survival greater than 80%. However, after the 3rd instar there was a marked reduction of approximately 20% in the insect development.
It was observed an association between food resources and developmental stage (P=0.03), when the individuals were fasted for 24 hours and exposed to the food sources only at night. The contrast between the artificial vs. natural diet features pollen (P = 0.0054) resulted in a higher percentage of choices for both nymphs and adults of D. luteipes by one of these sources (Tables 2 and 3). Also, the time spent during feeding was significant for second instar nymphs (P = 0.02604). When contrasting the diet vs. uredospores (P = 0.0223) and diet vs. pollen (0.0292), the nymphs of the second instar ate more time in the diet (Figure 2C), of which they had previous experience. There was no dependence between the chosen food and the stage of D. luteipes (P= 0.25), when the fasting period was 48 h and the food test was performed at night. Thus, there was only a difference in the feeding time of adults in relation to the combination of diet vs. pollen, and they preferred to feed on pollen (P = 0.0083), even without previous experience of feeding (Figure 2J).
In the tests performed during the day, the results for fasting for 24 hours (P = 0.66) and 48 hours (0.06), there was no dependence between the food source and stage of development (data not shown).
4. Discussion
Our findings showed that omnivorous habit plays a fundamental role in the survival and maintenance of D. luteipes. However, as an omnivorous insect, the consumption of a single food source can influence the duration of both instar and nymphal stages, as demonstrated by Marucci et al. (2019). These authors observed a low survival of D. luteipes under exclusive feeding of S. frugiperda eggs instead of corn pollen, while the dietary combination of pollen plus aphid resulted in twice the insect survival rate.
Nevertheless, Pasini et al. (2007) reported a different result demonstrated by the survival rate of 75% of D. luteipes fed exclusively with eggs of S. frugiperda. Interestingly, the combined diet consisting of eggs of S. frugiperda plus P. polysora uredospores increased the survival of D. luteipes without altering the total duration of its young phase.This result was similar to that of using the artificial diet, which is a food source considered appropriate for maintaining D. luteipes in the laboratory.This finding highlights the need for a diversified diet and reinforces the omnivorous habit of D. luteipes. From this perspective, the known voracity of D. luteipes (Souza et al., 2021; Romero-Sueldo and Virla, 2017), suggests that this predator has a great potential to reduce prey and fungal pathogens in maize fields. Also, in the maize reproductive stage, the pollen functions as an essential factor attracting and maintaining D. luteipes in the maize cultures.
To understand the role of D. luteipes as a predator with dual function (i.e. entomophagous and mycophagous), we determined the food preference of this insect in a situation of concomitant occurrence of pollen,eggs,and uredospores. As a nocturnal predator, regardless of the fasting time, it was possible to verify an association between the choice of different tested food sources and the development stages only at night, with pollen preference over control, both by nymphs and adults.
In the tests performed during the day, even after 48 h of fasting, it was not possible to determine the feeding preference of nymphs and adults of the predator. According to Naranjo-Guevara et al. (2017), the consumption of S. frugiperda by females of D. luteipes occurred between 7 pm and 9 pm, and in the daytime, there was no consumption even after 48 hours of fasting. These results indicate that D. luteipes forages exclusively at night regardless of the fasting period.
The members of the order Dermaptera are known to live in a dark and damp shelter, mainly in aggregation (Hehar et al., 2008; Campos et al., 2011). They have a tigmotactile habit (Jarvis et al., 2005) seeking direct contact with cospecific and the maize plants, which provide an ideal shelter for the insect during the day. At night, adults of D. luteipes are more active and spend more time feeding on pollen. In this sense, the maize pollen represents a nutritious food source, rich in carbohydrates, proteins, amino acids, lipids, vitamins, minerals, and trace elements (Malerbo-Souza, 2011).
Food sources such as pollen, sap, nectar, and fungi are a crucial alternative diet to some predatory insects (Pemberton and Vandenberg, 1993; Lundgren, 2009). However, the time allocated by omnivorous predators to consume prey vs. plant resources such as pollen, directly influence their effectiveness as biocontrol agents (Schuldiner-Harpaz et al., 2016). The specific benefits resulting from alternative-food consumption will depend on the development stage of the predators, as well as on the nutritional quality of the food eaten and on how the combination of food diets meets their nutritional needs at the specific stage of the development (Goeriz Pearson et al., 2011). This observation highlights a complex system with several simultaneous interactions where one action interferes with the performance of the other, along with the direct influencing factors such as age, sex, and environmental conditions (Simpson and Raubenheimer, 1995).
In our work, the exposure of D. luteipes to a single food source (i.e. eggs of S. frugiperda, uredospores of P. polysora, or maize pollen) directly interfered in the nymphal development as reflected in the number of emerged adults. Thus, any nutritional deficiency occurring in the early stages of development significantly increases the mortality and compromises the reproductive parameters of the predators (Hodek et al., 2012). This result indicates that such foods can act as complementary sources of nutrients but not exclusive, during the active growth phase of D. luteipes. Although D. luteipes has completed its developmental cycle by feeding exclusively on uredospores, this food should be considered only as a complementary food, since it prolongs the duration of the young phase and reduces the survival rate of nymphs. Marucci et al. (2019) observed a similar result when D. luteipes was fed exclusively with pollen. Although pollen is an essential nutrient for the reproductive phase of D. luteipes, it is detrimental during the nymph development stage. The gain due to complementary feeding of omnivorous predators can vary according to the development stage, thus justifying different food choices between nymphs and adults (Vankosky and VanLaerhoven, 2015). Females of Forficula senegalensis (Audinet-Serville, 1838; Dermaptera: Forficulidae), for example, require a rich diet composed of pollen or animal prey in order to oviposit. Diets based on pollen or eggs and larvae of Lepidoptera constitute a better quality food for F. senegalensis, which guarantee a high percentage of fertile females, and allow some females to continue laying eggs (Boukary et al., 1998).
Although the effects of omnivory are still poorly elucidated, they open a new perspective toward understanding the real role of D. luteipes as a biological control agent and exploring this relationship to minimize the effects of pests and fungal diseases in maize crops.Thus, the omnivorous and mycophagous habit of D. luteipes can be advantageous in maize production areas since they allow the survival of a biological control agent with a diversified diet based on lepidopteran eggs, fungal structures, and maize pollen.However, some natural features of D. luteipes, such as its subsocial behavior, and the direct contact with plants and cospecifics, may represent a risk for the maize crop. Considering that the uredospores are only partially destroyed in the digestive tract of D. luteipes (Silva et al., 2022), thus the predator can function as an agent of dispersion of the pathogen spreading fungal diseases throughout the maize crop.
Future studies should address the direct contact of D. luteipes with plants and conspecifics. Understanding this trophic behavior of D. luteipes is relevant to determine the real contribution of this important predator in the biological control of pests and diseases in maize culture.
description: Published as part of Pacheco, R. C., Silva, D. D., Mendes, S. M., Lima, K. P., Figueiredo, J. E. F. & Marucci, R. C., 2023, How omnivory affects the survival and choices of earwig Doru luteipes (Scudder) (Dermaptera: Forficulidae)?, pp. 1-8 in Brazilian Journal of Biology (e 243890) (e 243890) 83 on pages 3-6, DOI: 10.1590/1519-6984.243890, http://zenodo.org/record/11552773