2015 Teasel Seed Head Collection

I have completed collecting Teasel seed heads for the 2015 season and am happy about the progress being made in reducing the number of Teasel growing in the fields.  Gathering the seed heads prevents the ripe seed from being scattered about the field and producing a new generation of this non-native invasive plant.

This is the third consecutive year that I have gathered Teasel tops from the seven acres of Teasel infested young prairie at Blue Jay Barrens.  This area, formerly the site of a moderate Teasel infestation, was practically Teasel free this year.

Most of the Teasel was scattered across the field as individual plants or small groups of two or three.  Areas of concentrated Teasel were generally less than 20 feet in diameter.

Unusual this year were the random plants that appeared to have lost their tops to browsing deer.

These topped plants managed to send up new shoots that flowered and produced seed heads.  The deer are going to have to do better than this if they wish to be heralded as a new weapon against Teasel.

My entire 2015 collection fit into three feed sacks, none of which was filled.  Total weight collected this year was 36 pounds, a 63 percent reduction over last year’s 97.5 pounds.  Teasel has a two year life cycle.  Year one is spent as a basal rosette of leaves.  During its second year, the plant sends up a tall stalk and produces flowers.  The plant then dies and the seeds are dropped as the plant dries.  The reduction in population size this year is a result of the 2013 seed crop being removed from the field.  The Teasel population size should continue to shrink, but the seeds previously dropped in the field can wait several years before germinating, so it will be a while before the population is reduced to a negligible amount.

I’ve had a lot going on the past couple of weeks, so the only time I could put to collecting Teasel was early in the morning.  Awaiting me each morning were a few Teasel heads, dew laden Indian Grass and a large collection of spider webs.

The webs were the product of the Banded Garden Spider, a common resident of this field.

Each orb web was accompanied by a structure of random webs to one side.  The spider was sandwiched between these two creations.  I assume the intent of the random webbing is to give the spider notice of the approach of a possible predator, such as a spider hunting wasp.

I left one late flowering Teasel head in place for a couple of days to give this Red-Banded Crab Spider a chance to finish its meal of Robber Fly.  That big fly should be more than enough to fill up the spider.

The buzz of Robber Flies was common throughout the field.  Diogmites species like this were especially abundant.

A first for me at Blue Jay Barrens was the sighting of this Citrine Forktail.  This tiny damselfly would be nearly impossible to find if you were searching for it.  I saw it only because the low angle of the sun made the insect appear as a bright fleck of gold among the sea of Indian Grass.  I don’t know what it was doing out in the middle of a dry prairie so far from water, but I’m glad it was there.

Water Garden Predators

The Blue Jay Barrens Water Garden will be celebrating its 15 year anniversary this summer.  On August 4, 2000 I installed a liner into the completed excavation and diverted runoff from downspouts in the front of the house to the leak proof pool area.  Two days later, a light rain put an inch of water in the bottom of the pool, and that night, treefrogs deposited several egg clusters.  Since then life in the pool has been in a state of constant change.  Each year is a new experience with new players, both plant and animal, finding a place in this tiny pool.  Most conspicuous in the pool these last few years has been a growing number of predators that feed on the masses of small animals attracted to a permanent body of water.

All plants in the Water Garden are native to this area, with the exception of the Water Lilies.  I’ve had a desire for a pool of Water Lilies for most of my conscious life, so I bought some tubers, planted them in weighted tubs and put them into the Water Garden.  After a couple of years, the Water Lily root mass grew so large that it floated the pots to the surface.  My thought was to transplant the tubers into larger pots with heavier weights, but when I hauled the plants out of the water I found that the lily roots had completely enveloped the pots.  I settled for adding more weight by strapping bricks around the outside of the root mass.  This worked for a couple more years, then up came the root masses with all of my bricks neatly hidden inside.  At that point I decided to just leave the lilies alone.  Now the root masses rise to the surface each summer with the growth of new roots and then sink again in the fall as the roots die back.  Islands created by the root masses are becoming populated with a variety of aquatic plants that don’t mind a winter long emersion.

In last few days there has been a mass emergence of damselflies from the pool.  The shed skin of the aquatic nympth is left behind by the newly emerged adult form.

Both the aquatic and adult forms of damselfly are predators.  Adults capture and consume small flying insects, while the aquatic nymphs feed on insects, tadpoles, fish, worms and anything else small enough to be captured and held.

Adults seem to emerge most often under the cover of darkness.  In the morning, newly emerged individuals can be found resting on stable structures near the water.  It takes a while for the wings and exoskeleton to harden, and for the full coloration of the adult to develop.

Unlike most other damselflies, Spreadwing Damselflies hold their wings slightly apart.  These damselflies are slightly larger than the average.

This is one of the Bluet Damselflies.  This is a small, delicate Damselfly that is quite common here at Blue Jay Barrens.

Male and female bluets join in tandem for mating and egg laying.  This pair is insuring a supply of Damselflies will be around next year.

Aquatic plants growing in pots set on a shallow shelf at the edge of the Water Garden have long since escaped confinement and found their own anchorage.  A tangle of rush stalks and other dead vegetation give a foundation for an assortment of water loving vegetation.  Some were planted when the Water Garden was first filled, but most have arrived by more natural means.

The thick vegetation may be a place of safety for some, but it also harbors a healthy population of predators.  These young spiders have just recently emerged from heir silken egg sack.

Most of these will fall to larger predators or relocate far distant from here, but several will stay and grow to adulthood in the lush vegetation of the Water Garden.

Red-spotted Newts are the top of the line submerged predator.  They can detect the slightest movement and will investigate any creature their own size or smaller.  If they can fit it in their mouths, they will eat it.  I don’t believe you can stuff a newt so full that it would stop trying to eat more.  Males like this one are continually cruising the pool looking for food and for breeding opportunities.

Female newts typically remain more hidden, but they are still alert for anything that may be food.

When newly hatched, salamander larvae are heavily preyed upon by the newts.  As the salamanders  grow, they become a predator as efficient as the newt.  The difference between the two is that the salamander only spends a portion of its life in the pool.  It will soon mature into a land dwelling form and take off for a more terrestrial lifestyle.

Bullfrogs are probably the most aggressive above water predators in the Water Garden.  As long as he can avoid the notice of Minks, Raccoons and Herons, this guy should have no problems.  Anything smaller than this guy’s mouth is in danger of being eaten.  Bullfrogs are typically just temporary visitors and after a few weeks will move on to new hunting grounds.  If it ever rains here again, this frog will probably move on.

Adult Green Frogs have a chance of competing against a large Bullfrog, but those that have just recently transformed from the tadpole stage are just Bullfrog food.  This young frog has just lost the last of its tail stub and is watching for a flying insect to come within grabbing distance.

Gray Treefrogs have a tough time competing in a permanent pool.  Predators make quick work of the newly hatched tadpoles and the adult frogs are in danger of becoming a Bullfrog meal.

Northern Water Snakes will also make a meal of tadpoles and frogs.  There are at least two mature water snakes now living in the Water Garden.  They arrived here as youngsters several years ago and have been growing steadily since.

I’ve resigned myself to the fact that the Water Garden has become a home for top level predators.  That is why I’ve initiated other projects to provide temporary pools to those aquatic creatures that cannot deal with a high predator load.  I’ll just keep enjoying the Water Garden and see what comes next.

Ebony Jewelwing

The increased flow in the creek has resulted in an abundance of stream dependent creatures. This is a male Ebony Jewelwing damselfly, sometimes called the Black Winged Damsel. A male will watch over a section of stream that he defends as his territory. Females lay their eggs in the stream and are attracted to the best quality riffles, so males compete fiercely for control of these areas.

Female Ebony Jewelwings have lighter colored wings and less intense body coloration. There are also white spots near the tips of the wings. Since the males are so aggressive toward other males of the same species, there probably needs to be a noticeable difference between the sexes to help facilitate successful pairings.

These common damselflies are never far from streams and are most often encountered flying over the water or perched on vegetation near the stream bank. This male, shown bottom right, has attracted a female, middle left, into his territory. After mating, the male will guard the female from the advances of other males as she lays her eggs.

The male uses a special wing display to attract females. The wings are slowly spread apart and then abruptly closed.

An interested female will respond with a like signal. This particular courtship was interrupted when the male flew off to chase away another male. While the two were chasing each other around, the female took off and headed downstream.

Dragons and Damsels

The excess rain may cause some problems, but I’ve been enjoying having so much water in the pond. By the Fourth of July the pond is normally so shallow that the raccoons can wade into the middle and dine on any remaining tadpoles or large insects. The pond level now is more typical of what you would find in April and those insects that require a larger body of water are swarming in. The rushes are not completely inundated and provide the perfect structure for aquatic insects to use for egg laying.

The air around the pond is a constant buzz of dragonfly wings. Some species, like this Common Whitetail, have established territories and stand guard from some stationary vantage point. Common Green Darners and some others never seem to land and continually circle the pond, being chased by different individuals as they cross from one territory to another.

One of the most common dragonflies is the Blue Dasher. Several of this species can usually be found around the water garden each year, but with the pond available, they are here in amazing numbers.

Blue Dashers will often raise their abdomen until it points directly upward. Literature suggests that they point the tip of the abdomen toward the sun in order to reduce exposure and avoid overheating. I noticed some individuals exhibiting this posture in the shade. This photo was taken in late afternoon and this west facing dasher increased its exposure to the sun by assuming this posture. The temperature was about 90 degrees F, so the insects were probably warm. Maybe the up abdomen posture is a cooling strategy that works by other means than just reducing contact with the sun’s rays.

Here is a pair of Southern Spreadwing damselflies. Spreadwings are usually noticeably larger than the common damselflies and hold their wings apart when at rest. The female places her eggs above the water line and inside living plant stems. The female of this pair probed every stem they landed on, but I couldn’t tell if she was actually laying any eggs.

This damselfly is one of the bluets, and holds its wings together while at rest. These damselflies always seem so dainty and fragile. It’s hard to think of them as winged killers that spend their days munching away on mosquitoes and other small insects. I’ve watched damselfly larvae in an aquarium eat mosquito larvae as fast as they could be caught. They may be small, but they are certainly not helpless.