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Diversity of Wild Bees along Elevational Gradient in an Agricultural Area in Central Java, Indonesia.

1. Introduction

Wild bees (order Hymenoptera: Apoidea) represent the most important group of pollinator insects because they play a key role in agriculture, pollinating almost all crop varieties. However, they are increasingly at risk of local and even global extinction due to climate change [1], which can disrupt the overlap of flower production and pollinator flight activity [2]. The major characteristic of climate change is an increase in the mean global temperature. Elevated temperatures are known to influence the foraging activity, body size at maturity, and individual lifespan [3] of wild bees. The physiological impacts of climate warming might not have negative effects on individual insect pollinators; in fact, some could even have positive effects. Increases in mean temperature affect the diversity and abundance of wild bees in agricultural ecosystems.

Elevational gradients can be used as model systems for climatic change to analyse the role of environmental filtering effects on animal communities [4]. Comparative studies of species ecology along elevational gradients can provide clues to the likely response of both species and communities in the study of the effects of increasing temperature on the diversity and abundance of pollinator insects. However, there are significant differences among the characteristics of typical elevational gradients. Pollinator community composition is expected to change along an elevational gradient due to differences in ambient daily temperature. Due to the harsher environmental conditions, the number of pollinator species tends to decrease with increasing elevation [5]. The relative abundance of Hymenoptera has been negatively correlated with increasing elevation [6]. However, some studies have found that Hymenoptera, especially wild bees, are the most abundant floral visitor at high elevations, at least for some plant species [7]. Total pollinator richness [8] and abundance [9] have been found to decrease with increasing elevation, with plants becoming more ecologically specialised at higher elevations [10]. However, to the best of our knowledge, the wild bee diversity and abundance along an elevational gradient in agricultural areas has not previously been studied in Java. In this study, we investigated the diversity and abundance of wild bees in an agricultural area along an elevational gradient to test the hypothesis that elevation is a significant factor underlying the species composition and abundance of wild bees.

2. Materials and Methods

2.1. Study Area. The study was conducted in areas of green bean (Phaseolus vulgaris) cultivation at seven locations along an elevational gradient: Lomanis, Cilacap Regency (7[degrees]41'06 32"N, 109[degrees]01'12 24"E, 8 m above sea level (asl)), Gunung Tugel, Purwokerto (7[degrees]28'03 92"N, 109[degrees]14'06 35"E, 106 m asl), Banteran, Sikapat, and Banyumas Regency (7[degrees]20'00 43"N, 109[degrees]16'29 49"N, 224, and 442 m asl, resp.), Limpakuwus and Tuwel, Tegal Regency (7[degrees]09'46 38"N, 109[degrees]09'06 66"E, 664 and 887 m asl), and Serang, Pubalingga Regency (7[degrees]14'48 41"E, 109[degrees]17'28 91"N, 1077 m asl). In the regions, green bean is a minor vegetable crop that extensive planting is usually very small and located on land planted with other types of vegetables such as long bean, but, as for research purposes, this plant was chosen because it was found at all altitudes.

2.2. Sampling of Bee Diversity and Identification. The seven long bean plantations were sampled twice each month from April to June, 2014. We collected 100 plant individuals at each site, using the standard sweep net procedures described by Brosi et al. [11] (2008) to sample the bees. During each sampling session, 14 members of the field team (two persons per location) aerially netted bees over 30 min periods. Bees both on flowers and in flight were collected individually with the sweep net. Sampling was performed in the morning (07:00-09:00 local time) on fine days. Bee species were identified by the Indonesian Institute of Science, Bogor. Voucher specimens are held at the Entomology Laboratory, Faculty of Biology, Jenderal Soedirman University, Indonesia.

2.3. Statistical Analyses. The species richness and abundance of wild bees recorded in the seven plots were analysed. A general linear model was applied using SPSS ver. 18.0 software. The dependent variables were wild bee species richness and abundance, and the categorical variables were elevation and daily temperature. Raw data from the field were used to reveal species richness, species diversity (Shannon-Weiner index), component of dominance (Simpson dominance index), and relative abundance of different species at each sampling site [12]. Comparisons of species composition according to location were performed using single linkage cluster analysis based on Bray-Curtis similarity. All diversity parameters were analysed using Biodiversity Pro software [13].

3. Results and Discussion

3.1. Species Composition. In total, 932 individual wild bees belonging to 8 species, 5 genera, and 3 families were collected during the study period. Apidae was the most dominant family, with 6 species (Xylocopa latipes, X. confusa, X. caerulea, Apis cerana, A. dorsata, andAmegilla cingulata), and two-families (Megachilidae and Halictidae) were represented by one species each. The composition of wild bee species found at the seven elevations varied, with the largest number of species (8) at the middle-to-high elevations (442-1017 m asl), and the lowest species richness at the lowest elevation (8 m asl), with only 3 species. Xylocopa latipes, X. confusa, Apis cerana, and Megachile relative were observed at most elevations. Apis dorsata and Xylocopa caerulea were found only at the middle and high elevations (Figure 1(a)). Species richness differed significantly among elevations (analysis of variance (ANOVA): [F.sub.6,49] = 5.445,p = 0.000223 < 0.05). Increasing elevation increased wild bee species richness up to 893 m asl ([R.sup.2] = 0,84) and then decreased species richness above 1017 m asl (Table 1).

3.2. Abundance. In total, 932 individual wild bees belonging to 8 species, 5 genera, and 3 families were recorded. Site 1 supported 4 species with 63 individuals (5.8% of all individuals); Site 2, 5 species and 84 individuals (9.01%); Site 3, 5 species and 116 individuals (12.44%); Site 4, 7 species and 187 individuals (20.06%); Site 5, 8 species and 201 individuals (21.5%); Site 6,8 species and 169 individuals (17.06%); and Site 7, 7 species and 122 individuals (13.09%) (Figure 1(b)).

Wild bee abundance differed significantly among sites (ANOVA: [F.sub.6,49] = 3.478, p = 0.006 < 0.05). The most abundant species was Apis cerana with 189 individuals (20.2%), followed by X. confusa and X. latipes, each with 160 individuals (17.16%), M. relativa with 103 individuals (11.05%), X. caerulea with 97 individuals (10.4%), A. cingulata with 76 individuals (8.1%), and A. dorsata with 74 individuals (7.9%), and the least abundant was L. malachurum with 73 individuals (7.8%). Comparing the wild bee abundance among sampling events at all elevations, the highest abundance was from sampling number 2 with 199 individuals (21.3%), followed by sampling number 1 with 172 individuals (18.4%), sampling number 4 with 157 individuals (16.8%), sampling number 3 with 148 individuals (15.8%), sampling number 5 with 136 individuals (14.5%), and the lowest abundance was from sampling number 6 with 120 individuals (12.8%). However, statistical analysis revealed no significant differences among sampling events (ANOVA: [F.sub.5442] = 1.01800 p = 0.419 > 0.05).

Across the study sites, diversity increased with increasing elevation (Shannon-Wiener index (H') = 1.4, dominance (D) = 0.25, and evenness (E) = 0.78 at low elevation to (H') = 2.04, D = 0.13, and E = 0.96 at high elevation), and higher numbers of species were found at middle and high elevations. The distribution of wild bees among the sites was significantly influenced by elevation. The richness, abundance, diversity, and evenness of wild bees at different sites are presented in Table 1.

Analysis of community structure similarity among elevations showed that the three sites categorised as low elevation (8-224 m asl) had high similarity (84.53%), the two middle-elevation sites (424-644 m asl) had 83.50% similarity, and the two high-elevation sites (893 m-1017 m asl) had 79.7% similarity. However, the highest species similarity (87.2%) was found between Site 5 (644 m asl) and site 6 (893 m asl) (Figure 2).

4. Discussion

The number of wild bee species and the species composition recorded in this study were similar to those reported in previous studies in various regions. Hoiss et al. [14] observed 10 species of wild bees at Vigna unguiculata in Ghana belonging to the families Apidae (Xylocopa, Apis, and Amegilla), Megachilidae (Megachile eurymera), and Halictidae (Nomia sp.). Kwapong et al. [15] reported that the main insects observed on cowpea flowers were bees such as Apis mellifera, Ceratina sp., Megachile sp., Xylocopa calens, Xylocopa imitator, Braussepis sp., Lipotriches sp., Melecta sp., and Amegilla sp. Kingha et al. [16] reported Apis mellifera as the most abundant insect species visiting P. vulgaris flowers in Kenya, followed by Xylocopa calens and X. inconstans. The flowers of long bean attract wild bee pollinators from Apidae, probably because the members of this family have sufficient strength to open the flower to collect pollen and nectar [17]. However, to the best of our knowledge, to date there have been no studies on insect pollinator diversity in green bean cultivation areas in Indonesia for comparison purposes. In Sukabumi, West Java, in mustard (Brasica rapus) at an elevation of approximately 854masl, Aouar-Sadli et al. [18] observed insect pollinators from the order Hymenoptera, family Apidae, subfamily Apinae, consisting of the species Apis cerana, Apis dorsata, and Trigona sp., from the subfamily Xylocopinae, the species Xylocopa caerulea, X. confusa, X. latipes, and Ceratina sp., from the family Colletidae, subfamily Hylaeinae Hylaeus sp., from the family Halictidae, subfamily Nomiinae Nomia sp., and from the family Scoliidae Compsomeris lindenni. Our study findings indicate that the species composition of insect pollinators on agricultural land is dominated by wild bees.

Elevation strongly influenced the diversity and abundance of wild bee communities. Species richness and abundance increased linearly with increasing elevation, and species diversity was highest at middle elevations. These results are inconsistent with those of Gottlieb et al., [19], who reported that the diversity and abundance of wild bees decreased linearly with increasing elevation from 60 to 2000 m asl. This difference may be due to differences in the geographical region, climate zone, and range of elevational gradient. A commonly reported pattern in species richness along elevational gradients is a unimodal distribution with a mid-elevation peak [20]. In our study, peak species diversity occurred at middle elevations due to the presence of two species (Apis dorsata and Xylocopa caerulea) that began to appear above 442masl. The presence of the giant honey bee (A. dorsata) at mid-to-high elevations may be due to habitat suitability rather than elevation effects because these bees require a forested habitat with high trees, whereas blue carpenter bees tend to be abundant in cool environments. Large carpenter bees (genus Xylocopa) are wood-nesting generalist pollinators of broad geographical distribution. Their foraging is characterised by a wide range of food plants, long season of activity, tolerance of high temperatures, and activity under low illumination levels [21]. Carpenter bees tolerate high ambient temperatures during foraging, and most species are inactive at low temperatures, and these bees were found in all of our study sites. All of the sites from the lowest to highest elevation had daily temperature ranges appropriate for wild bees. Generally, the genus Xylocopa is able to move around well in a daily temperature range of 25-35[degrees]C [22]. This heat tolerance suggests efficient heat regulation ability in carpenter bees, possibly controlled by a thermoregulatory centre in the prothorax [23]. In contrast, Apis cerana has a tendency to forage in conditions of warm temperatures [24]. The presence of the three species Megachile relativa, Amegilla cingulata, and Lasioglossum malachurum almost evenly at all elevations studied indicates that these species are able to move around in the range of temperatures that occur at these elevations.

5. Conclusion

Eight species of wild bees from four families of the order Hymenoptera were recorded in green bean cultivation areas at seven different elevations in Central Java, Indonesia. Species richness and abundance increased linearly with increasing elevation, and species diversity was highest at middle elevations.

Disclosure

The English in this document has been checked by at least two professional editors, both native speakers of English. For a certificate, please see: http://www.textcheck.com/certificate/ A8au11. http://dx.doi.org/10.1155/2017/2968414

Competing Interests

The authors declare that they have no competing interests.

Acknowledgments

The authors are grateful to Yulia Arnitasari, Tutut Kusuma Wahyuni, Ismayanti Pangalinan, Riadiana Sulistyaningrum, and Ganesha Rifky Rinaldi for assistance with data collection and their encouragement of this study from its inception. This study was a part of a larger research programme funded by Jenderal Soedirman University. They also thank the heads of the Institute of Research and Community Services, Jenderal Soedirman University, for their support.

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Imam Widhiono, Eming Sudiana, and Darsono Darsono

Faculty of Biology, Jenderal Soedirman University, Jl. Dr. Soeparno no. 63 Purwokerto, Central Java 53122, Indonesia

Correspondence should be addressed to Imam Widhiono; imamwidhiono@yahoo.com

Received 6 December 2016; Accepted 12 January 2017; Published 31 January 2017

Academic Editor: Jacques Hubert Charles Delabie

Caption: FIGURE 1: Species richness (a) and abundance (b) of wild bees among elevation.

Caption: FIGURE 2: Similarity (Bray-Curtis) single linkage of wild bee in seven different elevations.
TABLE 1: Species composition, abundance, and diversity of wild bees
and seven different elevations.

Species                     Elevation m above sea level (asl)

                            8      108     224      424

Xylocopa latipes           18      26       25       27
Xylocopa confusa           15      14       19       44
Xylocopa caerulea           0       0       0        15
Apis cerana                20      23       37       44
Apis dorsata                0       0       0        21
Amegilla cingulata          1       4       11       8
Megachile relativa          9      10       11       16
Lasioglossum malachurum     0       7       13       12

Abundance                  63      84      116      187
Relative (%)               6,7    9,01    12,44    20,06
Mean temperature          34,3    32,5     31,2     30,4
  [degrees]C
Shannon.H                 1,408   1,622   1,684     1,93
Simpson_1-D               0,740   0,778   0,7944   0,8361
Evenness_e^H/S            0,817   0,843   0,897    0,860

Species                    Elevation m above sea
                              level (asl)

                           644      893      1017

Xylocopa latipes            26       22       16
Xylocopa confusa            26       19       23
Xylocopa caerulea           29       31       22
Apis cerana                 38       27       0
Apis dorsata                26       16       11
Amegilla cingulata          22       13       17
Megachile relativa          20       18       19
Lasioglossum malachurum     14       13       14

Abundance                  201      159      122
Relative (%)              21,56    17,06    13,09
Mean temperature           29,8      29      28,7
  [degrees]C
Shannon.H                 2,045    2,035    1,919
Simpson_1-D               0,8665   0,8634   0,8498
Evenness_e^H/S            0,966    0,956    0,973

Species                   Abundance   Relative (%)

Xylocopa latipes             160         17,16
Xylocopa confusa             160         17,16
Xylocopa caerulea            97           10,4
Apis cerana                  189          20,2
Apis dorsata                 74           7,9
Amegilla cingulata           76           8,1
Megachile relativa           103         11,05
Lasioglossum malachurum      73           7,8

Abundance                    932
Relative (%)
Mean temperature
  [degrees]C
Shannon.H
Simpson_1-D
Evenness_e^H/S
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Title Annotation:Research Article
Author:Widhiono, Imam; Sudiana, Eming; Darsono, Darsono
Publication:Psyche (Cambridge, 1874)
Date:Jan 1, 2017
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