Monarch News

There has been good and bad news on the monarch scene lately.  First there was the Monarch population status report that showed an increase in population for this year.  These estimates are based on the area that overwintering Monarchs cover in Mexico.  The statistics are graphed below but the methodology and details are best explained by in the Monarch watch blog. 

Area occupied by over-wintering Monarchs- Monarch Watch

Then came the news on March 11 of a "winter storm of historic proportions" which struck the overwintering area. When the Monarchs come down the mountain they don't usually return but instead begin their journey north. Since the initial report there has been no reports of the results of the storm.

"It will never get off the ground!" - REK

Now there is news of an incredible new technology. You are now familiar with the technology of radio transmitters such as that which allows us to track the movements of individual bears in Missouri. These are large boxes attached with a heavy leather collar, not a problem for a large bear to haul around. Now this technology has been miniaturized to fit on a Monarch! In this report from National Geographic you can see a Monarch being fitted with the transmitter which weighs .007 of an ounce. This is approximately the weight of 3 postage stamps.

“The best moment was when the first butterfly with the tag took off and landed on a flower and foraged, and then really flew with the tag. Initially it is a little hard because they have a little weight that they have to get adjusted to, but then when they fly off, it’s like a launch of a satellite,” Wikelski says. “It’s so amazing because we didn’t know if it would work, and now we know that they fly with the tag and we can follow them, so this is really an amazing advancement in science and understanding of these insects.”

I suspect our black bears will refuse to wear their old collars when they hear of this technological breakthrough.

Black bears

Connecticut is proposing a ban on feeding black bears and coyotes.  I have to admit that I hadn't given much thought to people feeding coyotes but apparently that occurs back east, presumably drawing them in for photographs.  It is legal there to hunt and trap coyotes.

Bears are a whole different matter.  Connecticut has an estimated 800 bears in their woodlands and the state is 8% the size of Missouri which has an estimated 300 bears.  Add in the fact that the Connecticut human population density is over 8 times greater than Missouri.*  That's a lot of bears and humans crowded together in a tight space.

The ban of feeding bears in Connecticut is controversial while feeding them is illegal in the 8 other northeastern states.  There is even more resistance to the idea of a hunting season.  Animal rights activists argue that human behavior is almost always responsible for potentially dangerous bear confrontations.

Karen Noyes feeding bear - Oregonlive.com

The Internet is littered with photographs of people feeding bears.  An Oregon woman named Karen Noyes continued to hand feed bears over a 6 year period in spite of complaints.  There were bears killing livestock, menacing neighbors and one coming through a dog door.  She was finally banned from her home during three years probation for refusing to stop. 

Costalreview.org

In North Carolina, Kay Grayson, called the "Bear Lady," was famous for feeding bears at her remote home for 25 years. She was found in 2015, eaten by bears although whether she died first and was found by them is unknown.  That almost seems beside the point.  Feeding bears in the wild puts everyone who is nearby at risk.  Whether deliberate or accidental by training them to find dog food or garbage, we are responsible for the results and the bear is likely to pay  the consequences.

Bear area (green) and USFS lands

While our Missouri bear population density and geography is far different, the lessons are the same and we have time to apply them before the problems develop.  Humans and bears need to learn to live with each other - separately.

* Connecticut Population - 743/square mile, Missouri - 88/sq.mi.  Wikipedia

MIgrating Woodcocks

Woodcock in the flower bed - Dave Millsap

Doodling in the mulch - Dave Millsap

The last 10 days we are are hearing about occasional sightings of woodcocks.  In addition GOAS reports, we got these pictures from Dave Millsap taken in the center of Springfield. 

"Carolyn spotted the woodcock when she went out to get the Sunday paper. It was working around in some mulch in a flower bed in our front yard. I stepped out on the front porch and took these pictures. He did not mind my presence until I stepped off the bottom step. At that point he was gone in a flash."

This is the time of year that woodcocks (or our preferred name, timberdoodle) are migrating northward to their summer breeding grounds which extend all the way to southern Canada.  We are at the southern edge but for now we are a way station where the males precede the females and practice their romantic overtures in our fields and forests.


For two years we participated in a study of their resting sites during migration as described in this 2014 blog.  The study is over but we went out this weekend just to enjoy their excitement and it occurred to us that others might enjoy the experience so we have attached the basics of hunting timberdoodles by ear in this paper, abstracted from the instructions we received from Cari Sebright from the University of Arkansas.

Basically you will need to go to Woodcocks on Allaboutbirds to hear their distinctive twitteringflight sounds and the buzzing peent call.  Then head out after this front passes to make random stops listening for them in the woods and fields.  You might even get lucky and spot their dizzy falling flight in the sunset sky.

Just received word that the woodcock migration which started a week early is already over - they have moved on.  I will re-post this next Spring.

Another Sign of Spring

Spring Azure - REK

Spring Azure female - Bob Moul

We have been seeing lots of Goatweed Leafwing and Mourning Cloak butterflies over the last 3 warm weeks.  These are butterflies that overwinter as adults, sheltering under loose bark and coming out on warm days to stretch their wings and look for a snack of tree sap.  Last week a few anglewings also appeared but Saturday the most welcome sight was the appearance of Spring Azures flitting along the gravel drive in front of my sniffing terrier.


Spring Azures, Celastrina ladon, are to butterflies like the Harbinger of Spring, Erigenia bulbosa,  is to wildflowers, a tiny message from nature that spring is officially here regardless of what the calendar says.  Watching these two tiny creatures measuring less than an inch leading us down the drive I could almost hear them giggling in delight at the prospects ahead.

Violacaea form - Bob Moul

There are three identifiable forms (color patterns) among Spring Azures.  Violacea has scattered dark spots.  The marginata form has a dark band on the hindwing while lucia has dark borders on both wings and a prominent dark splotch in the middle of the hind wing.  While these names are catnip to the butterfly aficionado, to me they simply mean there is a confusing color variation in the species.

Marginata form with dark band on hindwing - Bob Moul

 

Lucia form - Tom Murray

Early spring is a delicate balancing act between flora and fauna.  No one knows for sure what prompts a shrub to bud at a certain time but early butterflies are gambling that it will occur in time for the eggs they are ready to deposit.  It is even a bigger gamble for these specimens as there doesn't seem to be a source of nectar in sight.

Zebra Swallowtail egg already perched on an unfolding leaf - REK

This delicate timing reminded me of an early April day two years ago when I walked through a dense pawpaw grove.  In all those trees there were only three buds that were open, but there glistened a yellow egg of a Zebra Swallowtail, whose caterpillar soon would munch on the tender leaf as it unfolded.  Timing is everything at this time of year.  How they do it without a calendar or weather forecast is another of nature's great mysteries.

Black Carp are Breeding

Black Carp - Wikipedia

The St. Louis Post-Dispatch reports the chance finding of two juvenile black carp in a ditch connected to the Mississippi that has raised concerns about a new invasive species.  Unlike the bighead, silver, and grass carp, the so called "Asian carp" threatening our major rivers, black carp have been uncommon in the wild and not known to reproduce.

Black carp (Mylopharyngodon piceus) are also called black Chinese roach which probably should have been a clue.  They have been introduced cautiously by the aquaculture industry to control snails.  Strict controls on their transport as well as birth control measures kept them in check.  Only triploid fish were permitted, those with three pairs of genes which makes them sterile.  If this idea of releasing only sterile exotic species sounds familiar, Callery pears will probably come to mind.

Black Carp - Duane Chapman USGS

Of the four Asian carp species grown in China and Vietnam for food, the black carp is most prized for their flavor.  They are harder to raise in aquaculture as they eat only snails and mussels.  Trematodes (flukes) that can infect aquaculture are parasites that potentially threaten humans.  They require snails to complete their life cycle, hence the use of black carp to limit their spread.

Several black carp with normal diploid genes have been found in rivers but the hope was that their infrequency would prevent successful mating.  Now at least one pair has successfully mated.  The Mississippi has the most diverse collection of mollusk species in the world and three-fourths of these species are listed as threatened or endangered.  The spread of black carp which can weigh up to 150 pounds is a serious threat to mollusk diversity.  Just what we needed, another $%#^ invasive species!

Harbinger of Spring - REK

Now it is officially spring at Bull Mills.  Barb found the first Harbinger of Spring so let the fun begin.  On a more pleasant note you can review March Phenology Findings here.

Water Striders

Striding across the pond - REK

Water striders were dancing on the pond surface in large numbers last Saturday, prematurely celebrating the early arrival of spring.  Their ability to seemingly defy gravity is entertaining to all who watch as seen in my video from that day.  The secret to its delicate ballet is really that of one of the amazing properties of water called surface tension.

   Jim Moore

Striders are bugs (Hemiptera) in the Gerridae family.  Most have wings although that may vary between generations (wing polymorphism), some having long wings to migrate distances to establish new territory, others short wings for short trips.  At other times they may have none at all.  The advantage of having wings may be outweighed (literally) by the added weight they have to carry across the water surface.  Like other Hemiptera, they have sucking mouth parts which can pierce their prey, digesting them externally and sucking in the contents.

Each of its three pair of legs serve a different function.  The front pair are equipped with claws in the middle like a preying mantis, allowing them to grab and puncture their prey.  The middle pair serves as oars, quickly propelling them across the water while the longer back legs support their weight and act as rudders.  When they sense vibrations or waves from a struggling insect, they can turn rapidly and attack as fast as one meter a second.

Responding to a twig thrown in the water - REK

The surface tension of water is a key to their success.  You can experience this yourself by floating a coin on water as demonstrated with this video.  The scientific explanation is as follows:

"At liquid-air interfaces, surface tension results from the greater attraction of liquid molecules to each other (due to cohesion) than to the molecules in the air (due to adhesion). The net effect is an inward force at its surface that causes the liquid to behave as if its surface were covered with a stretched elastic membrane. Thus, the surface becomes under tension from the imbalanced forces, which is probably where the term "surface tension" came from."  Wikipedia

The other factor is the cluster of tiny hydrophobic hairs covering their body, over 1,000 microhairs per millimeter.  On the legs, they keep the strider on top of the water, riding on the surface tension.  The hairs on the body prevent wetting even from rain, that otherwise would weigh them down.

   The elastic surface tension is stretched under each leg -  Stan Lupo

Mating rituals require communication between the sexes, and male water striders send their courtship message through water vibrations.  They send out three different frequencies of water ripples.  A high frequency 25 Hz repel signal or a lower 10 Hz threat signal are warnings.  If a repel signal isn't returned by another water strider, the male knows it is a female.  Then he gives the lowest frequency 3 Hz signal signifying courtship, the Barry White approach to romance.

   Strider Astride - Stavros Markopoulos CC

It gets even more complicated as described in this Discover magazine article.  Studies suggest that when females resist mating, the mounted males can send out vibrations that would attract predators such as backswimmers and fish.  Since these attack from below, the vulnerable female is more likely stop resisting the mating. 
High speed video of water striders and surface tension.

CWD Hits Arkansas

Chronic Wasting Disease - Mike Hopper, Kansas Department of Wildlife, Parks and Tourism

The first case of chronic wasting disease (CWD) in Arkansas was reported in an elk near Pruitt along the upper end of the Buffalo River.  There are around 600 elk in the area which has become a draw for tourists.

CWD Distribution 2015 - By USGS, National Wildlife Health Center

This Arkansas case was found due to a special permits elk hunting season as the only way the disease can be diagnosed is by studying the brain and spinal cord of the animal.  As of 2015, CWD has been confirmed in 26 free ranging deer in 5 northeastern Missouri counties.

CWD is thought to be caused by a prion, an infectious protein without an associated nucleic acid.  It causes a condition called transmissible spongiform encephalopathy, similar to bovine spongiform encephalopathy (popularly known as mad cow disease), scrapie in sheep, and Creutzfeldt-Jakob Disease in humans.  So far there is no evidence of any risk of CWD to humans.

Baiting deer for hunting is illegal in Missouri but feeding deer isn't.  Lots of well meaning people hang a corn feeder so they can watch "their" deer come in for supper.  Wisconsin is one of 12 states that still allows hunting deer brought into deer feeding stations, but they are discouraging the practice due to disease.

"Wisconsin DNR wildlife health officials say both CWD and Tuberculosis (TB) are transmitted through deer to deer contact and concentrations of deer at bait and feeding stations are likely to promote the transmission of infectious agents. CWD is also transmitted through exposure to a contaminated environment and TB is transmissible from contaminated food and feed sites."

We have long known that human diseases spread more rapidly when we are crowded together.  Epizootic hemorrhagic disease and bluetongue (EHD)
in deer occurs in late summer as water sources dry up and deer gather tightly together for water.  Too much sharing among them isn't healthy.  Maybe the time has come for us to stop sharing our corn with them at feeders.

EHD or Bluetongue- What is the difference?
Ten reasons you don't want CWD in your woods.
The Missouri Department of Conservation web site has lots of information on CWD.