Observations
on an unusual behaviour in the Carpenter Bee Xylocopa aestuans (Latreille, 1802) (Hymenoptera: Apidae)
of the Western Ghats, India
Sachin A. Punekar1, Navneeth K.P. Kumaran2 & Hari R. Bhat3
1,2 Paleobiology Group, AgharkarResearch Institute, G.G. Agarkar Road, Pune, Maharashtra 411004, India
3 107, AvantiApartment, Opposite Kamla Nehru Park, Erandwane, Pune, Maharashtra
411004, India
Email: sachinpunekar@gmail.com
Date of publication (online): 26 September 2010
Date of publication (print): 26 September 2010
ISSN 0974-7907 (online) | 0974-7893 (print)
Editor: K.R. Sasidharan
Manuscript details:
Ms
# o2271
Received
28 July 2010
Final
revised received 07 July 2010
Finally
accepted 18 August 2010
Citation: Punekar, S.A., N.K.P. Kumaran & H.R. Bhat (2010). Observations on an unusual behaviour in
the Carpenter Bee Xylocopa aestuans (Latreille,
1802) (Hymenoptera: Apidae) of the Western Ghats,
India. Journal
of Threatened Taxa 2(10): 1232-1233.
Copyright: © Sachin A. Punekar,Navneeth K.P. Kumaran &Hari R. Bhat 2010. Creative Commons Attribution 3.0 UnportedLicense. JoTT allows unrestricted use of this
article in any medium for non-profit purposes, reproduction and distribution by
providing adequate credit to the authors and the source of publication.
Acknowledgements: The authors are grateful to the Director, AghrakarResearch Institute for facilities and officials of the AnshiNational Park, Karnataka for permission to conduct field studies.
The
genus Xylocopa distributed in all the continents consists of 51 subgenera and
about 450 species (Leys et al. 2000). The subfamily Xylocopinae has four tribes, Xylocopini, Allodapini, Ceratinini and Manuelini of which
the first three tribes are represented in India and its neighboursby 43 species, under seven subgenera (Leys et al. 2000; Gupta 2008).
The
bee Xylocopa aestuans under the subgenus Koptortosoma Gribodo, 1894 has been recorded from
many localities in South East Asia and Africa (Gupta 2008) from deadwood, pithy
stems, bamboo culms, wooden beams in the open buildings. Female or sometimes both male and
female bees construct nests by digging tunnels or holes, in a week or more
depending upon the substrate (Vicidomini 1997; Raju & Rao 2006 and SAP &
HRB pers. obser.).
Observations
on foraging, so far, refer to the provision made for developmental stages by
the adults. This provision mainly
contains pollen mixed with nectar (Raju & Rao 2006), popularly known as ‘Bee Bread’ for
juveniles. In the absence of
critical data, it is presumed that adults feed on the same diet as larvae. Our observations indicate an unusual
feeding strategy possible in Xylocopa aestuans.
In
this observation, made during June 2005, in AnshiNational Park, Karnataka. As of
now Xylocopa aestuans is known to feed strictly on the
pollen and plant nectar and they are yet to be known to prey upon the
insects. In this study we found
that the bees pick up the Red Tree Ants Oecophylla smaragdina, a common ant species in the
Western Ghats (Image 1A), fight against and kill, carry them away, probably to
their nests (Image 1B,C). This
activity raises questions (1) whether the adult female Carpenter bees are
switching over to carnivory, (2) whether a seasonal
strategy to tide over the non-flowering period of arborescentplants as carpenter bees mostly prefer them, (3) consume the ants and
regurgitate with the harvested pollen and plant nectar to prepare more
nutritious ‘Bee Bread’ for juveniles? Although most of the arborescent plants in Anshi National Park do not flower during June, a few plants
of Syzygium caryophyllatum (Myrtaceae)
bloom. And as such, there may be a
competition among the pollinators and the opportunists like carpenter bees (Xylocopa spp.),
butterflies (Blue Tiger, Common Crow, Rice Swift), Honey Bee (Apis dorsata) and Flower Wasp (Scolia sp.)
that harvest nectar and pollen (Image 1D-I) (Punekar2007) leading Xylocopa aestuans to forage on Red Tree Ants. Thus, phenologicalcondition may be a stress response factor for Xylocopa aestuans or such an
unusual feeding behaviour may not have been
reported. Considering Xylocopa aestuans is well-known pollen and plant
nectar feeder and harvesters, the unusual feeding behaviourappears to be a new phenomenon. Analysis of bee bread prepared by Xylocopa aestuans may reveal whether the foraging
strategy is a seasonal or new ethological condition.
References
Gupta, R.K. (2008). An annotated catalogue of the bee species of
the Indian Region. Jai Narain Vyas University, Jodhpur.
[http://www.geocities.com/beesind2/xylocopa.htm] accessed on 15 March 2009.
Leys, R., S.J.B. Cooper &
M.P. Schwarz (2000). Molecular phylogeny of the large carpenter bees, Genus Xylocopa (Hymenoptera:Apidae), based on Mitochondrial DNA sequences. Molecular Phylogenetics and Evolution 17: 407-418.
Punekar, S.A. (2007). An assessment of floristic diversity of Anshi National Park, Karnataka. PhD Thesis submitted
to University of Pune, Pune,
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A.J.S. & S.P. Rao (2006). Nesting habits,
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