[NatureNS] Re: Japanese Mosquito

Date: Tue, 09 Aug 2011 13:38:52 -0300
To: naturens@chebucto.ns.ca
From: Angus MacLean <angusmcl@ns.sympatico.ca>
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<font size=3>From certain of the literature, it seems that
&quot;<i>Ochlerotatus japonicus&quot;&nbsp; </i>is not to be messed with!
(Perhaps that could be said of all the mosquitoes found in NS?)<br>
Here is one reference:</font>
<ul>
General impacts</b>
Ochlerotatus j. japonicus</i> is a species of mosquito with an aggressive
opportunistic feeding habit, taking bloodmeals from avian and mammalian
hosts, with a preference for human blood (Molaei et al</i>., 2009).
Laboratory studies have shown Oc. j. japonicus</i> to be an efficient
vector of
<a href="http://www.issg.org/database/species/../species/ecology.asp?si=304&amp;fr=1&amp;sts=sss&amp;lang=EN">West
Nile Virus (WNV)</a> but its role in the natural transmission of the
virus is unknown (Scott, 2010; Molaei et al</i>., 2009). Furthermore WNV
has been detected in field-collected Oc. j. japonicus</i> is at least
nine different states. It is thus very likely that this species could
serve as a bridge vector of the WNV to humans. <br><br>

Oc. j. japonicus</i> is also a highly efficient vector of St. Louis
encephalitis virus and a moderately efficient vector of eastern equine
encephalitis and La Crosse viruses in laboratory tests. It has also been
known to transmit Japanese B encephalitis to humans (Molaei et al</i>.,
2009; Andreadis et al</i>., 2001; Sardelis et al</i>., 2003; Sardelis et
al</i>., 2002). <br>

Larvae of Oc. j. japonicus</i> are highly effective competitors and can
reduce populations of native mosquito populations significantly through
interspecific competition for limited resources. Surveys in Connecticut
in 2005 revealed that Oc. j. japonicus</i> was the dominant species
collected in all waste tyres and natural rock pool environments.
Comparisons with data from previous years indicated significant decline
of native species including Oc. atropalpus</i>, Oc. triseriatus</i> and
Culex restuans</i>.
</ul>Angus<br><br>
<br>
<font size=3>At 10:48 PM 8/8/2011, you wrote:<br>
<blockquote type=cite class=cite cite>While wandering the neighborhood
recently (Dartmouth) I came across an old metal container filled with
water and mosquito larvae and pupae (tumblers) . I collected about thirty
tumblers in jars to check the species. The first ten or so that hatched
were Common Rain Barrel Mosquito (<i>Culex pipiens</i>). The next ten or
so were Japanese Mosquito (<i>Ochlerotatus japonicus</i>). This species
was first found in North America in New Jersey in 1998. It was first
reported in New Brunswick&nbsp; in 2005. It was reported in Nova Scortia
in 2008 (Jeff Ogden).&nbsp; It may&nbsp; prove to be one of the most
common mosquitoes in the HRM. Its rapid expansion is amazing, spreading
in 13 years to more than twenty states and at least four provinces.<br>
It is a container breeding species and beautifully colored with a striped
golden back, silver spots on the thorax and abdomen and black legs
broadly striped with white below the joints.<br>
Jim Edsall <br>
Dartmouth, N.S.<br>
check out my personal website at <br>
http://www3.ns.sympatico.ca/jim.edsall/</font></blockquote></body>
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