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Date: Wed, 24 Jun 2020 12:03:49 -0700
From: Dennis Paulson <dennispaulson...>
Subject: Re: [CalOdes] More on Santa Barbara's Black Spreadwings

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As Jim said, this is SOP for many spreadwings. Indeed, when the rains come =
they=E2=80=99ll flood the basin, and as the temperatures rise in spring, th=
e eggs will hatch, and the larvae will fall into the water. They hatch into=
a prolarva, which is a funny-looking little thing that wiggles its way out=
of the plant and into the water, then immediately molts into the first-ins=
tar larva, which actually looks like a larval damselfly. Then they will gro=
w fairly quickly and emerge in a month or two to begin the cycle again.

The adults spend some time away from the water in an immature condition, t=
hen mature sexually and come back to the water to oviposit in plants, often=
over dry basins. I presume they have a way of recognizing places that will=
be flooded in the future, perhaps even by the plant species that grow ther=
e. It doesn=E2=80=99t always work, and you can envision how badly droughts =
could affect a species such as this one.

Dennis Paulson
Seattle

> On Jun 24, 2020, at 11:40 AM, Hugh Ranson <hranson...> wro=
te:
>=20
> Last week I wrote here about Nick Lethaby's and my discovery of a new sp=
ecies for Santa Barbara county, CA, the Black Spreadwing at a seasonal pond=
along West Camino Cielo, which runs along the spine of the Santa Ynez Moun=
tain range. Yesterday, Larry Ballard, Mark Bright, Bill Murdoch, Wim van Da=
m, and I ventured back to the pond. The water level had dropped a fair amou=
nt, but the numbers of Black Spreadwings had gone the other way. We were go=
bsmacked by what we found. There were well over 200 individuals. We counted=
more than 80 pairs in wheel and tandem, and these were the insects visible=
from one spot only. The cropped photos give some idea of the numbers. All =
spreadwings netted, photographed, or viewed through binoculars were Black S=
preadwing. I presume that they are laying eggs on (or in?) the emergent ve=
getation, and these eggs will survive after the pond dries and then the fi=
rst winter rains arrive (usually November or December). According to Jim Jo=
hnson, "this is standard operating procedure for many spreadwings in that h=
abitat."
>=20
> What happens next? Do the eggs hatch and the larvae fall into the water?=
Does anyone know the mechanism the species would employ for getting back t=
o the water?
>=20
> Mark Bright photographed spreadwings at this same location last summer,=
and while the photos are not conclusive, they are very much suggestive of =
the same species, so it's likely they've been around for a while. Other spe=
cies present included Wandering Glider (1), Common Whitetail (1), Western F=
orktail (1), and Common Green Darner (1).
>=20
> Hugh Ranson
> Santa Barbara
>=20
> <_MG_6039.jpg><_MG_6032.jpg><_MG_5965.jpg>


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<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html charset=
=3Dutf-8"></head><body style=3D"word-wrap: break-word; -webkit-nbsp-mode: =
space; -webkit-line-break: after-white-space;" class=3D"">As Jim said, this=
is SOP for many spreadwings. Indeed, when the rains come they=E2=80=99ll f=
lood the basin, and as the temperatures rise in spring, the eggs will hatch=
, and the larvae will fall into the water. They hatch into a prolarva, whic=
h is a funny-looking little thing that wiggles its way out of the plant and=
into the water, then immediately molts into the first-instar larva, which =
actually looks like a larval damselfly. Then they will grow fairly quickly =
and emerge in a month or two to begin the cycle again.<div class=3D""><br c=
lass=3D""></div><div class=3D"">The adults spend some time away from the wa=
ter in an immature condition, then mature sexually and come back to the wat=
er to oviposit in plants, often over dry basins. I presume they have a way =
of recognizing places that will be flooded in the future, perhaps even by t=
he plant species that grow there. It doesn=E2=80=99t always work, and you c=
an envision how badly droughts could affect a species such as this one.<div=
class=3D""><br class=3D""></div><div class=3D"">Dennis Paulson</div><div c=
lass=3D"">Seattle<br class=3D""><div class=3D""><br class=3D""><div><blockq=
uote type=3D"cite" class=3D""><div class=3D"">On Jun 24, 2020, at 11:40 AM,=
Hugh Ranson &lt;<a href=3D"mailto:<hranson...>" class=3D"">hra=
<nson...></a>&gt; wrote:</div><br class=3D"Apple-interchange-ne=
wline"><div class=3D""><div dir=3D"ltr" class=3D""><span style=3D"color:rgb=
(5,5,5);font-family:Helvetica,Arial,sans-serif;font-size:15px;white-space:p=
re-wrap" class=3D"">Last week I wrote here about Nick Lethaby's and my disc=
overy of a new species for Santa Barbara county, CA, the Black Spreadwing a=
t a seasonal pond along West Camino Cielo, which runs along the spine of th=
e Santa Ynez Mountain range. Yesterday, Larry Ballard, Mark Bright, Bill Mu=
rdoch, Wim van Dam, and I ventured back to the pond. The water level had dr=
opped a fair amount, but the numbers of Black Spreadwings had gone the othe=
r way. We were gobsmacked by what we found. There were well over 200 indivi=
duals. We counted more than 80 pairs in wheel and tandem, and these were th=
e insects visible from one spot only. The cropped photos give some idea of =
the numbers. All spreadwings netted, photographed, or viewed through binocu=
lars were Black Spreadwing. I presume that they are laying eggs on (or in?=
) the emergent vegetation, and these eggs will survive after the pond drie=
s and then the first winter rains arrive (usually November or December). </=
span>According to Jim Johnson, "this is standard operating procedure for ma=
ny spreadwings in that habitat."<div class=3D""><span style=3D"color:rgb(5,=
5,5);font-family:Helvetica,Arial,sans-serif;font-size:15px;white-space:pre-=
wrap" class=3D""><br class=3D""></span></div><div class=3D""><span style=3D=
"color:rgb(5,5,5);font-family:Helvetica,Arial,sans-serif;font-size:15px;whi=
te-space:pre-wrap" class=3D"">What happens next? Do the eggs hatch and the =
larvae fall into the water? Does anyone know the mechanism the species woul=
d employ for getting back to the water?</span><div class=3D""><span style=
=3D"color:rgb(5,5,5);font-family:Helvetica,Arial,sans-serif;font-size:15px=
;white-space:pre-wrap" class=3D""><br class=3D""></span></div><div class=3D=
""><span style=3D"color:rgb(5,5,5);font-family:Helvetica,Arial,sans-serif;f=
ont-size:15px;white-space:pre-wrap" class=3D""> Mark Bright photographed sp=
readwings at this same location last summer, and while the photos are not c=
onclusive, they are very much suggestive of the same species, so it's likel=
y they've been around for a while. Other species present included Wandering=
Glider (1), Common Whitetail (1), Western Forktail (1), and Common Green D=
arner (1).</span><br class=3D""></div><div class=3D""><span style=3D"color:=
rgb(5,5,5);font-family:Helvetica,Arial,sans-serif;font-size:15px;white-spac=
e:pre-wrap" class=3D""><br class=3D""></span></div><div class=3D""><span st=
yle=3D"color:rgb(5,5,5);font-family:Helvetica,Arial,sans-serif;font-size:15=
px;white-space:pre-wrap" class=3D"">Hugh Ranson</span></div><div class=3D""=
><span style=3D"color:rgb(5,5,5);font-family:Helvetica,Arial,sans-serif;fon=
t-size:15px;white-space:pre-wrap" class=3D"">Santa Barbara</span></div></di=
v></div>



<span id=3D"cid:f_kbtpcwl62">&lt;_MG_6039.jpg&gt;</span><span id=3D"cid:f_=
kbtpcwkw1">&lt;_MG_6032.jpg&gt;</span><span id=3D"cid:f_kbtpcwjn0">&lt;_MG_=
5965.jpg&gt;</span></div></blockquote></div><br class=3D""></div></div></di=
v></body></html>

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