nstantaneous and historical temperature effects on a-pinene
Impact of seawater on
development and reproduction of
red cotton bug, Dysdercuscingulatus(Fab.)
Author Details
K.Sahayaraj
(Corresponding
author)
Crop Protection Research Centre, Department of Advanced Zoology
and Biotechnology,
St.Xavier?s College (Autonomous), Palayamkottai
- 627 002, India
e-mail:
ksraj42@gmail.com
F.J.GladisBelsi
Crop
Protection Research Centre, Department of Advanced Zoology and Biotechnology,
St.Xavier?s
College
(Autonomous), Palayamkottai - 627 002, India
Publication Data
Paper received:
12
August 2010
Revised
received:
03
March 2011
Accepted:
07 March 2011
Abstract
Distribution
pattern of animals, modification of their life cycle and behaviours
have been governed by climatic changes.It affects the insect from egg
to adults.Eggs always face lot of stress either from biotic or abiotic threats. This study examined the flooding of Dysdercuscingulatus
eggs with seawater alone and in combination with fresh water on the egg
hatchability, survival and development, fecundity and hatchability of the
hatched nymphs and adults, respectively under laboratory conditions. Flooding
of egg in salt water, slightly and insignificantly increased the nymphal developmental period (24.2 days) of the insect.
However, treatment has no impact on the survival of nymphs (95.4%). Fecundity
(135.2 eggs female-1), hatchability (77.51%) has been gradually
decreased while the amount of sea water increased in the treated water.
Results revealed that entering of seawater into the agriculture fields alter
the reproduction of insects subsequently change the food web in the
ecosystem.
?
Key
words
Seawater
impact, Red cotton bug, Dysdercuscingulatus
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