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Interspecific Variation in Competitor Avoidance and Foraging Success in Sap-Attracted Insects

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Interspecific Variation in Competitor Avoidance and Foraging Success in Sap-Attracted Insects Eur. J. Entomol. 106: 529–533, 2009 http://www.eje.cz/scripts/viewabstract.php?abstract=1484 ISSN 1210-5759 (print), 1802-8829 (online) Interspecific variation in competitor avoidance and foraging success in sap-attracted insects JIICHIRO YOSHIMOTO* Laboratory of Insect Ecology, Graduate School of Agriculture, Kyoto University, Kitashirakawa Oiwake-cho, Sakyo-ku, Kyoto 606-8502, Japan Key words. Aggressive interactions, community, foraging strategy, interference competition, resources, tree sap Abstract. Many insect species attracted to fermenting sap often fight for access to this resource, which results in the establishment of interspecific dominance hierarchies. In one such system, the hornet Vespa mandarinia (Hymenoptera: Vespidae) behaviourally dominates during the daytime and several subordinate species avoid aggressive interactions in various ways. In order to elucidate the interspecific variation in competitor-avoidance behaviour and its subsequent effect on foraging success, the behaviour of species of hornets, beetles and butterflies at patches (exudation spots) in Japan was recorded. The percentage of individuals that succeeded in visiting a patch following departure from one, or an attempted visit, or after waiting near a patch for t 10 s, did not differ greatly among species, despite the distinctive differences in dominance between V. mandarinia and the other species. These results suggest that subordinate species may be equally effective at foraging for sap as the dominant species. The competitor-avoidance behaviour differed among the species. Vespa crabro and satyrine butterflies mainly avoided competition by actively moving away from com- petitors. The beetle Rhomborrhina japonica (Coleoptera: Scarabaeidae) often remained close to an occupied patch and waited for the occupant to leave, whereas V. ducalis and nymphaline butterflies used both tactics. The different costs associated with fighting or flight may have determined the differences in the foraging tactics of the species studied and behavioural switching in those species utilising both tactics. INTRODUCTION waiting behaviour and its effect on foraging success is Many insect species, such as beetles, wasps, flies and documented for several hornet species (Matsuura, 1969). butterflies, visit sap that exudes from various broad- However, neither the frequency of such waiting behav- leaved trees; for example, more than 100 species are iour nor the consequences of such competitor-avoidance attracted to sap on the oak Quercus acutissima in Japan behaviour for foraging success in other species have been (Yoshimoto et al., 2005; Yoshimoto & Nishida, 2008). documented. Such research would provide an insight into Tree sap communities exhibit many unique charac- the mechanisms resulting in variations in behaviour of teristics; for example, the community is composed of pri- insects that are attracted to sap and of species coexistence marily adult stages, most of whose larvae feed on food at patches. other than sap. In addition, antagonistic interactions often In the present study, the patch-visiting behaviour of occur among some of the species attracted to sap (e.g., large diurnal species (hornets, beetles and butterflies) was hornets and beetles). Thus, tree sap communities are examined to elucidate the interspecific variation in interesting systems for ecological and entomological competitor-avoidance behaviour and subsequent foraging research, although quantitative studies of these systems success. First, in order to determine whether species that are rare. adopt a competitor-avoiding strategy succeed in feeding In a recent study, Yoshimoto & Nishida (2009) docu- at patches, behavioural sequences were recorded. Second, mented interspecific dominance hierarchies established the foraging areas and inter-patch movement of individu- through interference competition in tree sap communities. ally marked individuals of several species of hornets and The giant hornet Vespa mandarinia Smith (Hymenoptera: butterflies were quantified in order to detect both intra- Vespidae) was by far the most dominant insect during the and interspecific differences in patch-visiting behaviour. day. Among the subordinate species, individuals avoided Here, the foraging tactics of each species are described aggression in various ways: hornet and butterfly species and factors determining the respective tactics discussed. frequently left patches of sap exuded by trees on the MATERIAL AND METHODS approach of competitors or after being threatened by Study site occupants (Yoshimoto & Nishida, 2009), whereas the beetle Rhomborrhina japonica Hope (Coleoptera: Scara- This study was conducted in a temperate secondary forest baeidae) often remained close to occupied patches until along the Iwakura River, Kyoto, Japan (35°05´N, 135°47´E, ca. 120 m in elevation). The site is dominated by oak, Q. acutissima the occupants left (J. Yoshimoto, pers. obs.). Such (Fagaceae), with an admixture of many other deciduous broad- * Present address: Laboratory of Environmental Ecology, Graduate School of Global Environmental Studies, Kyoto University, Yoshida Nihonmatsu-cho, Sakyo-ku, Kyoto 606-8501, Japan; e-mail: [email protected] 529 leaved trees such as Styrax japonica (Styracaceae) and Mallotus japonicus (Euphorbiaceae). This type of mixed forest, called Satoyama forest, is typical of Japan and harbours a great diver- sity of insects (Kato, 2001). Behavioural observations The behaviour of four hornet species (Vespa mandarinia Smith, V. crabro Linnaeus, V. analis Fabricius, V. ducalis Smith; Hymenoptera: Vespidae: Vespinae), one beetle species Fig. 1. Schematic diagram of possible behavioural sequences (Rhomborrhina japonica Hope; Coleoptera: Scarabaeidae: of individual insects visiting patches. The changes in behaviour Cetoniinae) and eight butterfly species (Neope goschkevitschii follow that indicated by the directions of the arrows. Curved Menetries, Lethe sicelis Hewitson: Lepidoptera: Nymphalidae: and bold arrows indicate repeated occurrence of the same Satyrinae; Kaniska canace Linnaeus, Vanessa indica Herbst, behaviour and behavioural sequences, respectively. The Polygonia c-aureum Linnaeus, Nymphalis xanthomelas Esper, sequences indicated by solid, broken and dotted arrows are Hestina japonica Felder, Limenitis camilla Linnaeus: Nympha- those shown in Figs 2, 3 and 4, respectively. “Perching” was linae) visiting patches were recorded. The behaviour of indi- omitted from the diagram because it can occur anytime except viduals was classified into one of seven categories: departure, between visiting and departure (see Material and methods for flew away, visit, attempted visit, waiting, perching and undeter- definitions of each behaviour). mined. The category departure was assigned to those individual that left a patch and remained in sight of an observer until it changed its behaviour. Flew away to those individuals that flew Data analyses out of sight. Attempted visit to those individuals that Foraging success after leaving a patch (visiting success after approached and then left a patch either without feeding or after departure) was assessed for each species as follows. First, the remaining at the patch for < 5 s. Visit to those individuals that number of individuals that left a patch and then succeeded in stayed at the patch for t 5 s. Waiting to those individuals that visiting a patch at least once was counted and the results pooled stayed at a distance of d 10 cm from a patch for t 10 s. When an across patches, time and year. Then, the percentage of indi- individual perched on a tree > 10 cm from a patch, it was cate- viduals that exhibited each category of behaviour, except those gorised as perching. A flow diagram indicating all the possible only exhibiting undetermined behaviour, was compared among sequences of these behaviours is presented in Fig. 1. Observa- those species for which the total number of observations was tions began when an individual exhibited any of the following each > 25. Datasets for marked individuals were excluded from three categories of behaviour: departure, attempted visit, or the calculations of visiting success for V. mandarinia, V. crabro waiting. Observations stopped when the individual flew away or and N. goschkevitschii because the method of determining total was lost from sight. All new arrivals on a tree were recorded as abundance differed for marked and unmarked individuals. As different individuals, because newcomers and repeaters were mentioned above, all newly unmarked individuals were consid- nearly impossible to distinguish without marking. The observa- ered to be different individuals. In addition, the total frequency tions were recorded over a period of 12 days between June and of each behavioural category shown by each species immedi- October 2005 and on 6 days between May and June 2006. Sup- ately after departing from a patch was obtained and the per- plementary observations on butterfly species were recorded over centage in each category compared among species. Statistical a period of 12 days between July and October 2006, because comparisons using chi-squared tests were only conducted for few results were recorded as previously these species were visiting success. Analyses excluded species whose expected uncommon. The behaviour of the insects was recorded daily values were < 5. When significant differences were detected, over a period of 60–180 min between 11:00 and 18:40 h. Both multiple pairwise comparisons were conducted using Bonferroni the times
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