Saturday, September 16, 2017

This Week in Anting 09/16/2017


 This week I got to try PawPaws for the first time ever and Lasius neoniger flew! 

Asimina triloba is the northern most member of the custard apple family which is largely tropical. This is the only species native to the United States and one of the few host plants to the Zebra Swallowtail Butterfly. The flowers are pollinated by small vinegar flies and are supposed to require a second cultivar or genetically different tree of the same species in order to produce fruit.... but this is the only tree in my yard and probably the only tree in the whole county. It would seem this cultivar is semi-self fertile. The tree is roughly 12' tall and produced 12 sizable fruits though not on every branch that flowered. Presumably had there been a genetically different tree nearby it would have made even more fruit. (It's either 'Sunflower' or 'Pennsylvania Gold')

The smell is amazing when ripe or slightly damaged. The fruits perfume the air with a fragrance that leaves one assuming some sort of Banana and Orange factory has exploded somewhere. It's very potent and alerts the homeowners, hikers, and wildlife that the fruit is ready. 

The inside texture is somewhat gooey verging on vanilla pudding except for the fairly large and flat seeds with are like skipping stones or pebbles. The taste of a slightly unripe one is that of bananas with hints of cantaloupe (or musk melon as it's known in most of the world). A fully ripe one tastes more like a really sweet banana with a candy-like quality to them. It's a shame this fruit has such a short shelf life of about a day and a half because that's been the main reason it hasn't become main stream. (When they are for sale they can sometimes go for $15 a pound!)


 Fruit such as this is intended to be eaten by animals and carried away from the tree in the wild. If it just falls to the ground though it falls on other creatures to then remove the fruit and free the seeds within. Fungus and mold will do the job otherwise but may also destroy the seeds within.

 Members of what must be a very happy Prenolepis imparis colony spent the day cutting up the fruit and hauling it home after most of the workers had engorged themselves on it.
 


 A fairly decent anatomy pic showing off the acidopore, a slightly tuft of hairs at the tip of the gaster/abdomen. This is a key trait when identifying ants in the subfamily Formicinae and a conclusive way to tell them apart from members of Dolichoderinae.

 Another good anatomy shot. Here the tiny waist segment is clearly visible separating the gaster from the mesosoma.

 Brachymyrmex dipilis was also flying that day. This is one of the smallest ants in the U.S.


Tuesday, August 29, 2017

This Week in Anting 08/28/2017


Finally got around to visiting Turkey Swamp Park this year and a few other locations around that county. 

Formica integra, were still there with foraging "trunk" trails. These are well maintained trails made by ants that tend to be in the same place every year. The ground around them is actually compacted down, not from the weight of the ants but because they're so good at clearing everything else away it's on the compacted parts that stay. The trail also ventures underground every few feet.

Dolichoderus plagiatus, are a species I've been calling "cone ants" but that almost as generic as calling them "black ants." The cone though refers to a hump-like structure on their mesosoma. This isn't visible in the photo above but online images of them show it more clearly, see here. Of the four Dolichoderus species in the US this is certainly one of the most colorful. They have bright orange spots that are sometimes full stripes on the gaster which goes well with the rest of the body which ranges from red/brown to black.

Oak Trees were full of life. White Oak in particular was bustling with caterpillars and aphids being tended by ants.


Another tree I couldn't identify was loaded with sawfly larva.
 
The Formica exsectoides mounds are still there. They weren't that active though. We went on too nice of a day it seems because for once you couldn't hear the leaves rustling from millions of ants crawling around. (I want my money back!)


Plant wise, I found a stand of Swamp Loosestrife, Decodon verticillatus, which is an uncommon aquatic wildflower. It has a wide distribution across most of the eastern US and Canada. It was bustling with bees and several butterflies.

Trachymyrmex septentrionalis, the Northern Fungus Farming Ant, likes to nest in sandy soil along odd types of scrub land where strange plants tend to grow. Prickly Pear is the only one I could really identify but there were lots of odd plants that might be mosses or are low growing conifers that barely push out of the ground and have compound leaves.

We also found a few colonies in an adjacent field where a patchy not so lush lawn was grown... I'm not sure if it's patchy because no one's water and maintaining it, or because the tiny leaf cutter ants are slowly stripping it. Whatever the case, these are ants of dry sandy settings in full sun where resources might be limited. They thrive here because they focus on other types of food, namely a kind of fungus they maintain by fertilizing with flower petals, bits of foliage, and the frass of caterpillars and grasshoppers.

These are small ants verging on 3 to 4 mm long. And even within that the workers vary somewhat within the same colony.

As far as ants in the North East go they're easy to identify. Their heads have spines on them, and their mesosoma has several small sets too. Their color is a unique orange/brown tone and parts that verge on being purple.

 Also when they dig they also gather up the dirt in clumps, making their mounds somewhat unique.

 We also found lots of mushrooms.

Sunday, July 2, 2017

This Week in Anting: Black Lighting


Had the black light on almost every night this week and saw lots of Acorn Ant activity. 
 
Hundreds of males to at least three species showed up at the black light between the hours of 9:00pm and 10:30pm. They probably fly all night but I don't need to stay out that late.

I've come to learn that identifying queens in this genus should never be done at a glance because there are some oddities I've never seen before.

So in the video this is what I was calling Temnothorax longispinosus. The problem is online images of queens of the species show them as totally black! None of this yellow spots on the gaster or bands of color. The legs are correct though. At a glance without any magnification this ant looked totally black to m.

 Now compare that to this queen. This is most likely Temnothorax ambiguus, and there were a lot of these running around in the video. They were very much different than the larger black species in the photo above. The trouble is though now that I have them in test tube setups these two look identical to one another! So I either have two species with very similar looking queens or some of the colonies to one species were just dehydrated (perhaps nesting somewhere with a small entrance hole requiring queens to slim down to leave the nest?)...

This is a Temnothorax curvispinosus queen. It is basically what all of my queens now look like besides a slight detail.

 The name "curvispinosus" refers to their curved spines. Those little thorns you see on rear part of the thorax on Temnothorax ants. 


  The name T. ambiguus refers to how difficult they are to tell apart from T. curvispinosus. The one main difference is that their spines are not curved at all.

Wednesday, June 21, 2017

Spring/Summer Azure Caterpillars on New Jersey Tea

My New Jersey Tea plant, Ceanothus americanus, is full of Spring/Summer Azure caterpillars. Their strategy to not get eaten is to produce honeydew to entice ants into protecting them. In this case the ants are Camponotus subbarbatus (a.k.a. "The Slightly Bearded Carpenter Ant" a common name referring to the slightly hard to see small hairs on their cheeks that lots of other ants also have... and not the more obvious yellow bands very easily seen on queens and larger workers that's almost never seen on other ant species in their range.)

The caterpillars gain the pigment and to some extent the texture of whatever they happen to be eating. In this case it's the flowers. Doing this helps them blend in with the plant, however the gangs of ants constantly hanging around them gives them away.

The butterflies are common where they occur and fairly wide spread across the north east, but the need for ants along with host plants can make some members of this genus uncommon.

The Karner Blue Butterfly is likely endangered because not only do they require wild lupins as a host plant. They also need ants to protect them and bring them back into the nest. Once inside they turn carnivorous and begin consuming the ant's brood for food, all the while still producing sweet honeydew for the ants to feed on. This isn't that bad though as ants often consume their own eggs or feed larva to one another, and the caterpillar itself isn't much bigger than two or three adult ants.

Spring and Summer Azures aren't as finicky. They can be found on a wider array of plants and don't need to be brought into an ant nest at all. (During the winter, they may survive better underground inside of an ant's nest where they form a chrysalis but I'm not sure they do this.) 

Host plants include the New Jersey Tea, as seen above, some Dogwoods, Collinsia sp, and Spiraea salicifolia. I've also found them consuming the flowers to Sourwood trees. They always start on the flowers to these plants which tend to be soft and tender (and likely lack any defensive chemicals the plant might be producing in its leaves) before moving onto consuming the leaves themselves if they need to. They take on the color of the flowers they consume so they're usually pink on Spiraea salicifolia, and can be sort of purple on Collinsia sp. and then turn green when they start eating the leaves.



Flowers are a good place to start because there's often ants stealing nectar from them already. Oddly enough once the ants find the caterpillar and taste the honeydew they produce, they will stop stealing nectar from the flowers and focus entirely on tending them. The caterpillars will also produce noises like a queen ant would make. 

Another benefit of having ants around is they protect against parasitic wasps that try to jam eggs in them. Ones that get parasitized will hatch out as wasps instead of butterflies after the chrysalis phase.

The New Jersey Tea shrubs I own are now finished flowering and most of their blooms are falling fast. The caterpillars are now moving on to consuming the leaves. 

I'll be rearing a few indoors to ensure they survive. I'm curious to see if any wasps emerge.

Their chrysalis's are extremely tiny and can be made on something as small as a blade of grass. Rearing them myself will help ensure I don't run them over with the mower.