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Nestmate recognition in defense against nest invasion by conspecifics during swarming in a one-piece nesting termite
Revista Chilena de Historia Natural volume 89, Article number: 11 (2016)
In one-piece nesting termites, which nest and forage in a single piece of wood, soldier production increases during the swarming period, i.e. when the risk of invasion of their substrate and hence of their colony by dealates in search of a nesting substrate increases. In Neotermes chilensis, a one-piece nesting termite endemic to Chile, we hypothesized: i) that during swarming soldiers would defend their colony by showing higher aggressiveness toward non-nestmate than toward nestmate dealates, ii) that aggressiveness would negatively correlate with genetic relatedness of interacting soldier/dealate pairs and iii) that nestmate recognition would be based on differences in cues provided by cuticular compounds (CC) between nestmates and non-nestmate dealates.
The first hypothesis was tested using bioassays in which a soldier was confronted with a nestmate or a non-nestmate dealate; the second hypothesis by using microsatellites to assess genetic relatedness of the interacting pairs; and the third hypothesis using bioassays in which a soldier was confronted with a nestmate or a non-nestmate dead dealate with or without its CC and with dead dealates with interchanged CC between nestmate and non-nestmate.
Soldiers were more aggressive toward non-nestmate than nestmate dealates, aggressiveness was inversely correlated with genetic relatedness of the interacting pair, and CC accounted for the differences in aggressiveness towards nestmate and non-nestmate dealates.
During swarming, soldiers of N. chilensis protect their nest against invasion by non-nestmate conspecific dealates; discrimination is based on CC and aggressiveness correlates inversely with genetic relatedness of the interacting soldier/dealate pairs.
Conspecific recognition plays a key role in the evolution of cooperative behavior e.g. [1, 2] and under a sociobiological context operates between different categories of organisms, e.g. between nestmates and non-nestmates, between individuals that share different degrees of relatedness or between organisms belonging to different castes. Nestmate recognition is widespread among eusocial insects and can be inferred from the outcome of the interaction between individuals from the same or different nests (or colonies) [3–6]. Chemical communication is the most ancient and widespread mode of communication in social insects and plays a significant role in nestmate recognition , an ability involved in the defense of colonies , particularly in situations where the likelihood of encounters with individuals from other colonies is high.
Termites are eusocial insects living in colonies. Several categories of termites have been proposed in relation to their nesting ecology and feeding habits [9–12]; main categories described are separate-piece nesters which nest and forage in different substrates and one-piece nesters which nest and forage in a single piece of wood . Colonies of all types of termites contain at least three castes: reproductives whose main function in a mature colony is reproduction, true workers (or pseudergates) in charge of food searching, nest building and brood care, and soldiers involved in colony defense . Immatures become true workers, a terminal caste, after the first molt, i.e., they are not able to develop into other castes, and are characteristic of separate-piece nesting termites [13, 14]; while pseudergates may become soldiers, alates or they may spend their whole life as pseudergates depending on environmental conditions [13, 14].
The behavioral repertoire preceding the founding of a colony is similar in all termites . During the warm season mature colonies produce alates of both sexes which disperse as swarms. Once they land, they lose their wings and give rise to dealates, which after choosing a potential mate search for a nesting substrate where they build a royal chamber, mate and oviposit [12, 15–17]. Potential substrates in the swarming area may already contain termite colonies which may then be invaded by incoming dealates. This calls for defense mechanisms in the colony which may be activated prior to the swarming period. It was recently shown that in the one-piece nesting termite Neotermes chilensis (Kalotermitidae), which uses dry scapes (stems of inflorescences) of Puya berteroniana (Bromeliaceae) as host , the ratio of soldiers to non-soldiers within a colony was greater at the onset of the swarming period than in the non-swarming period, in multicolonial scapes (Aguilera-Olivares D, Palma V, Zapata V, Flores-Prado L, Niemeyer HM, submitted manuscript). This observation suggests that colony defense in N. chilensis is enhanced during swarming, a possible reason being to counteract the risk of invasion by dealates. Although invasion of nests by dealates in one-piece nesting termites has not been reported, it may be expected to occur based on the following facts: i) computed tomography studies have shown that galleries of N. chilensis are generally distributed along the scape closest to the bark, particularly in mature colonies (Aguilera-Olivares D, Palma V, Zapata V, Flores-Prado L, Niemeyer HM, submitted manuscript), an observation consistent with that reported in the one-piece nester Cryptotermes secundus (Kalotemitidae) ; ii) the galleries of N. chilensis occupy a substantial proportion of the volume of the scape (mean: 39.7 %; range: 17.4-63.9 %, unpublished results); iii) in the one-piece nester Incisitermes minorhence (Kalotermitidae), a termite similar in size to N. chilensis, dealates penetrate about 12 mm into the wood and spread about 15 mm along the main axis of the substrate, a considerable distance within the substrate, in order to build their royal chamber  and iv) in an experiment where scapes with N. chilensis colonies were brought to the laboratory during the swarming season and covered with a fine-mesh tissue in order to count emerging alates, we gathered evidence of the return of dealates to the scape after swarming; thus, in all instances (N = 15) when emerged alates were not withdrawn after counting them and scapes were later dissected, dealates were found within the galleries. These observations suggest that penetration of dealates of N. chilensis to build their royal chamber during swarming is likely to cause invasion of existing galleries and hence encounters with resident soldiers. The defense capacity of soldiers against invading dealate conspecifics depends on their ability to recognize them as non-nestmates. Hence, experiments were performed with soldier/dealate pairs of N. chilensis aimed at testing the occurrence of nestmate recognition.
Furthermore, it has been repeatedly shown in separate-piece nesting termites that cuticular compounds (CC) play an important role in nestmate recognition e.g. [21–27]. Although this role has not yet been described in one-piece termites, we tested the possible involvement of CC in the interaction of soldiers and dealates of N. chilensis.
Lastly, since a negative correlation between degree of relatedness and intensity of aggression has also been reported in a separate-piece nesting termite , we tested the occurrence of such correlation with the data from the experiments mentioned above.
Study area and species
Field work was performed at Las Chilcas (32°52’S; 70°52’W) and laboratory work in Santiago, approximately 75 km south of the field site. N. chilensis is a drywood termite endemic to Chile between ca. 26 – 33.5°S  which in the study area uses dry scapes (cylindrical stems of inflorescences, ca. 10 x 200 cm, diameter x length) of Puya berteroniana (Bromeliaceae) as host, forming colonies containing up to 350 individuals. The plants show a patchy distribution at the site.
Scapes were severed from the rest of the plant in the field during the swarming season and brought to the laboratory in Santiago. Bioassays were set up to evaluate the occurrence of nestmate recognition of dealates by soldiers. Alates and soldiers were extracted and individually deposited inside 12-cm diameter Petri dishes whose bottom had been lined with filter paper. Once alates shed their wings forming dealates, one dealate individual was introduced in the experimental arena (a Petri dish where a soldier had remained for 20 min for acclimation) with a nestmate (N = 10) or a non-nestmate (N = 7) soldier. Once the dealate was introduced in the experimental arena, the bioassay started and was recorded for 15 min with a Sony ® Cybershot camera. The occurrence of behavioral events and the duration of behavioral states were evaluated through playback using the program JWatcher v1.0 . Following similar studies with termites [8, 24, 29–32], ants , wasps  and bees , the behaviors of the soldier which derived from a recognition process were classified as aggressive (biting, grasping, opening jaws), alarm (drumming) and non-aggressive (antennating, backing up). Biting includes perforating the exoskeleton of the dealate, grasping refers to holding the oponent with the jaws without inflicting apparent damage, drumming consists in body vibrations against the substrate, antennation involves touching the oponent with the antennae, and backing up implies running away or backing up after contact. Two additional behaviors were observed which did not seem to derive from a recognition process: standing still and walking along the walls of the arena; they were not included in the analysis. Biting, grasping and opening of the jaws occurred as events which were analyzed as the number of times they were observed during each bioassay; the other behaviors corresponded to states which were analyzed as the total time they were performed during each bioassay.
Bioassays were also set up to evaluate the involvement of CC in nestmate recognition; they incorporated a live soldier and a nestmate or non-nestmate dead dealate. Dead dealates were subjected to the following treatments: i) with CC: a dealate was killed by freezing for 5 min at −20 °C (N = 8 nestmates and N = 7 non-nestmates) thus retaining its own CC; ii) without CC: a dead dealate which had been immersed in 250 μL of pentane for 10 min to devoid it of its CC (N = 9 nestmates and N = 7 non-nestmates); iii) chemical disguise: a nestmate dead dealate without its CC was coated with the CC extracted from a non-nestmate – thus, the dealate was physically a nestmate but chemically a non-nestmate of the live soldier - and vice-versa (N = 10 nestmates and N = 10 non-nestmates), and iv) control of chemical disguise: a control of the previous bioassay, where the dead dealate without its CC was coated with its own CC (N = 8 nestmates and N = 7 non-nestmates). Behaviors of the soldier were observed and classified as above.
Each individual was used only in one bioassay. A total of 38 colonies were used, 12 for the bioassays with live termites and 26 for bioassays with a live soldier and a dead dealate. In the nestmate treatments, each interacting pair replicate came from a different colony. In the non-nestmate treatments, for each soldier/live or treated dealate combination only one soldier and one dealate were withdrawn from each of the colonies used; the colonies were selected haphazardly to set-up the interacting pair replicates. These precautions avoided pseudoreplication.
In both types of bioassays, the results from the two treatments were compared for each class of behaviors using the two-tailed t-test. When data did not fulfill normality and homoscedasticity conditions, the Mann–Whitney U-test was used . To perform parametric analyses, ln-transformations were used for aggressive behaviors in the bioassay with live termites and in the control of chemical disguise bioassay with a dead termite, and SQRT-transformations were used for non-aggressive behaviors in the bioassay with live termites, for aggressive behaviors in the with CC bioassay with a dead termite, and for alarm behaviors in all bioassys with a dead termite excepting the chemical disguise bioassay. Statistical analyses were performed with the program Statistica 7.0 .
Genetic differences between individuals bioassayed
Once a bioassay with live soldiers and dealates ended, termites were individually stored for genetic analysis in 70 % ethanol. DNA was obtained from termites using the Qiagen DNeasy Blood & Tissue kit. Genetic analyses were performed with microsatellites developed specifically for N. chilensis; microsatellite characterization and PCR conditions were as described earlier . Relatedness between interacting individuals from each behavioral bioassay replicate was determined using the KINSHIP 1.3.1 software . The relatedness degrees between nestmate and non-nestmate pairs were compared using two-tailed t-test. A Spearman Rank correlation was performed between relatedness degree and aggressive, alarm or non-aggressive behaviors between soldier and dealate pairs (N = 17) using the program Statistica 7.0 .
When soldiers were confronted with live dealates, the number of aggressive events of soldiers was significantly higher toward non-nestmate than toward nestmate dealates (t15 = 8.22; P < 0.001), while differences in the duration of alarm and non-aggressive behaviors between nestmates and non-nestmates were not significant (Fig. 1).
When soldiers were confronted with dead dealates with CC the number of aggressive events of soldiers was significantly higher towards non-nestmate than toward nestmate dealates (t13 = −2.65; P = 0.02; Fig. 2a); significance disappeared when dealates without CC were used. In the chemical disguise treatment, the number of aggressive events was significantly higher toward nestmates that were chemical non-nestmates than toward non-nestmates that were chemical nestmates of the soldier (U10,10 = 15.5; P = 0.01), while in the control of chemical disguise treatment the number of aggressive events was significantly higher towards non-nestmates than towards nestmates (t13 = −2.97; P = 0.011) (Fig. 2a). The duration of alarm behaviors did not differ between nestmate and non-nestmate combinations (Fig. 2b). Finally, the duration of non-aggressive behaviors did not differ significantly between nestmate and non-nestmate combinations except in the control of chemical disguise treatment where it was significantly higher (t13 = 3.02; P = 0.009) between nestmates than between non-nestmates (Fig. 2c).
Behavior and genetics
Relatedness differed significantly (t15 = 2.09; P = 0.045) between nestmates (mean ± SE: 0.26 ± 0.05) and non-nestmates (0.11 ± 0.05). The number of aggressive behavioral events of soldiers towards nestmate and non-nestmate dealates were significantly and negatively correlated with genetic relatedness of the interacting pair (Spearman correlation: r = −0.604; P = 0.01; Fig. 3); the duration of alarm and non-aggressive behaviors were not correlated with genetic relatedness.
The outcome of bioassays involving nestmate and non-nestmate soldier/dealate pairs depended on the type of behavior observed. Alarm behaviors were performed for very short times and differences between non-nestmates and nestmates were not significant. The main function of alarm signals is to warn nestmates of potential threats ; however, under isolated bioassay conditions in which there are no nestmates to alert, alarm signals appear superfluous. Additionally, non-significant differences were found in non-aggressive behaviors between nestmate and non-nestmate dealates; this may be expected since to non-aggressive behaviors do not help against the attack of a dealate.
Soldiers of N. chilensis were more aggressive towards non-nestmate than nestmate dealates, showing that soldiers are able to discriminate between nestmate and non-nestmate dealates; thus, nestmate recognition is a trait present in soldiers of N. chilensis. Nestmate recognition has been also demonstrated in several species of separate-piece nesting termites where individuals encounter individuals from another colony during foraging activities e.g. [24, 41–46]; in the one-piece nester Zootermopsis nevadensis (Termopsidae), intercolonial interactions resulted in agonistic behaviors leading to the killing of primary reproductives in a context of colonies sharing the nesting substrate . Recently, Aguilera-Olivares et al. showed that N. chilensis soldiers were more aggressive toward non-nestmate than nestmate primary reproductives, pseudergates and soldiers .
Bioassays showed that when CC remained on a dead dealate, the interacting soldier was more aggressive toward a non-nestmate than a nestmate; however, when CC were washed away from the carcass, such difference disappeared; moreover, when the dealate was chemically disguised the former differences were inverted, and when cuticular compounds were reinstituted to the owner dealate differences were reestablished. Mostly non-significant differences were found in alarm and non-aggressive behaviors in the chemical bioassays. When CC were restored to the original owner the duration of non-aggressive behaviors was higher towards nestmate than non-nestmates. These results show that CC play an important role in the nestmate recognition capacity of soldiers towards dealates of the one-piece termite N. chilensis; such role has been repeatedly shown in separate-piece nesting termites e.g. [21–27].
Aggressive behaviors between soldiers and dealates were negatively correlated with the degree of relatedness of the interacting pair. These results show that soldiers of N. chilensis were able to discriminate between dealates with different degrees of relatedness, suggesting kin recognition capacity. Given that the nesting substrate represents a limited resource for one-piece nesting termites in terms of space and food, it is expected that soldiers of N. chilensis defend their nesting resource and show aggression towards invading dealates. However, this aggression could be less intense when the interacting pair is more closely related. In other words, we propose that soldiers of N. chilensis are more willing to share their nesting resource with closely related individuals through kin recognition capacity. Related evidence has been reported in females of the bee Exoneura bicolor which exhibit social polymorphism. Thus, E. bicolor exhibits both solitary and aggregated nesting behaviors; in the latter case, aggregations occur between closely related females . Interestingly, N. chilensis and Z. nevadensis, both one-piece nesting termites, reside in pieces of wood which may contain one or more separate colonies of the same termite species (47; Aguilera-Olivares D, Palma V, Zapata V, Flores-Prado L, Niemeyer HM, submitted manuscript); it would be interesting to assess the genetic relatedness of colonies sharing the same substrate and compare it with the genetic relatedness of colonies from different nesting substrates in order to obtain additional support for the proposal above.
A negative correlation between degree of relatedness and intensity of aggression was also reported in the separate-piece nesting termite Macrotermes subhyalinus (Termitidae) ; genetic similarity between major workers - a sub-caste mostly devoted to defense - that were confronted in behavioral bioassays was significantly correlated with the level of aggression, and geographical distance played a major role in determining aggression behaviors . Furthermore, a genetic basis for CC composition was suggested , in agreement with previous studies [41, 44, 50, 51]. The situation, however, could be more complex than described above. For example, aggression in the separate-piece nesting termite Coptotermes formosanus (Rhinotermitidae) was not correlated with CC composition nor with genetic relatedness; rather, diet and some particular compounds it contained were found to account for aggression . Overall, these results show the importance that chemical communication, whether through endogenous or exogenous compounds, has in termite biology.
Nestmate recognition mediated by cuticular compounds was shown by soldiers of N. chilensis (a one-piece nesting termite) confronted with conspecific dealates.
Genetic results suggest than kin recognition occurs in soldiers of N. chilensis.
These results are relevant in order to complete the gap of knowledge on conspecific recognition in one-piece nesting termites, and show for the first time such recognition in soldiers confronted with dealates, making it possible to infer the role of the former under a potential risk of invasion into the colony.
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This work was financially supported by FONDECYT grant 1120210 to HMN, CONICYT grant 79100013 to LF-P, CONICYT fellowship for PhD studies D- 21080582 to DA-O, and MECESUP internship program to DA-O.
This work was financially supported by FONDECYT grant 1120210 to HMN, CONICYT grant 79100013 to LF-P, CONICYT fellowship for PhD studies D-21080582, and MECESUP internship program to DA-O.
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DAO: design of experiments, data analysis and interpretation of results, manuscript preparation. JRM: field and laboratory work, data analysis and interpretation of results: CBL: laboratory work, data analysis. LFP: data analysis, interpretation of results. HMN: design of experiments, interpretation of results, manuscript preparation. All authors read and approved the final manuscript.
The authors declare that they have no competing interests.
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Aguilera-Olivares, D., Rizo, J.F., Burgos-Lefimil, C. et al. Nestmate recognition in defense against nest invasion by conspecifics during swarming in a one-piece nesting termite. Rev. Chil. de Hist. Nat. 89, 11 (2016) doi:10.1186/s40693-016-0063-9
- Chemical communication
- Neotermes chilensis
- Kin recognition
- Cuticular compounds
- Aggressive behavior
- Genetic relatedness