Ants are the most abundant and successful organisms in the
world. They attract human attention for their fascinating teamwork, disciplined
movement, division of labor, selfless service to colony members, painful
stinging, and unwanted presence in household items. They are the intelligent
invertebrates that had initiated the practice of farming of fungi millions of
years before human arrival, could build well-protected nests and
territoriality, developed collective skills of foraging and mutualistic relationships
with hemipteran insects for nutritional rewards, etc. In terrestrial
ecosystems, ants play many vital roles that determine the health of the
ecosystem as many other fauna and flora are directly or indirectly dependent on
the ant community. The rapid changes in forest cover, land patterns, climatic
conditions, etc., and over-dependency on pesticides and fertilizers impact on
the ant community and diversity. Therefore, it is imperative to study this most
dominant fauna at current times at least to document their present status and
also to understand the health of the ecosystem and generate baseline
information. The state of Assam in India is a part of the Eastern Himalaya
biodiversity hotspot of the world but only a few studies on ant fauna have been
carried out till now from this part. The existing checklist of ant species in
Assam shows the presence of 217 species of ants under 58 genera. However, a
detailed study of these ant species is needed. Gauhati University campus,
Guwahati, Assam, offers a meeting place of different habitats viz. dense and
fringed forests, hilly areas, natural and man-made wetlands, open plain fields,
and undulating hilly terrain, grassland, cultivated area, protected botanical
garden, human settlement area with concrete and Assam type buildings where
chances of occurrence of diverse ant species are more. Hence this area is
selected for the case study of ant fauna and recorded the presence of 41
species of ants that account for 18.89% of the total species recorded from the
state. In the first chapter along with the general introduction about ants, we
describe these 41 species of ants mentioning their morphological
characteristics, feeding and nesting habitats, pest/predator status, and
distribution.
Ants are generally avoided by predators for their equipped
defensive strategies. Ant-mimicking spiders mimic ants morphologically to get
protection from predators in one way and deceive their prey in another way.
They chemically mimic ants to get constant resources and protection in the stable
microhabitat that is the ant’s nest. As of now, a total of 13 families of
spiders are known to show myrmecomorphy of which the majority of the
myrmecomorphic spiders belong to Salticidae and Clubionidae families. Many
species of the genus Myrmarachne of the Salticidae family show ant-like
appearance with elongated bodies and narrow anterior abdominal parts giving the
apparent shape of the petiole of ants.
Mostly the ant species belonging to the sub-families Formicinae,
Myrmicinae, Ponerinae, Pseudomyrmecinae, and Dolichoderinae are used as model
organisms by different spider species. Some of the mimicry is highly
species-specific and some are general. In the second chapter of the book, we
discuss the myrmecomorphic spiders and their model ants. Studies about
ant-mimicking spiders and their association with the model ants in India are
still scanty. On the campus of Gauhati University, we encountered 10
ant-mimicking spiders which show morphological resemblance with different model
ants present on the campus. Of the recorded myrmecomorphs, six species are
under the genus Myrmarachne, and one species each from the genera Myrmaplata,
Toxeus, Cambalida, and Apochinoma.
Many ant species are often seen visiting flowers. But
whether they perform a pollination role has long been a topic of debate. A
school of scientists opined that ants are poor pollinators as their body
morphology, behavior, and chemical profile are against successful pollen
transfer and pollen viability. Rather ants’ presence deters other potential
pollinators from flowers. Another group of researchers claims that the
flower-visiting ants only ward off inefficient pollinators, not the efficient
ones. At the same time, in arid and semi-arid zones where winged pollinating
insects are minimal or absent, certain ant species solely perform the role of
pollination. In the third chapter, we discuss the flower-visiting ants and
their functional roles in pollination based on existing literature. A list of
flower-visiting ants recorded on the campus of Gauhati University is also
presented.
Overall, these three chapters give a comprehensive idea
about the ants of Assam, ant-mimicking spiders and their model ants, and the
functional role of ants in pollination particularly in the context of the
selected study site.
Author(s) Details:
Bulbuli Khanikor,
Department
of Zoology, Gauhati University, Guwahati-781014, Assam, India.
Hridisha
Nandana Hazarika,
Department of Zoology, Gauhati University,
Guwahati-781014, Assam, India.
Jitumoni
Das,
Department of Zoology, Gauhati University,
Guwahati-781014, Assam, India.
Dipamani
Sarma,
Department of Zoology, Gauhati University,
Guwahati-781014, Assam, India.
Please
see the link here: https://stm.bookpi.org/AFAACSGUCGKA/article/view/11908