Week 17! Two green pictures: one bug and one flower.
First, a picture of a Green dock beetle (Gastrophysa viridula). They have a shiny, metallic sheen that’s primarily green but also gold, bronze and brass colors depending on their age and which light you see them in. If you see a metallic green little beetle and wonder how to identify which one it is, you can look at the legs – Green dock beetles have metallic green legs while most others have all black legs. This one was only 4 mm long so I think it’s a male (females are bigger).
(More info and pictures of a female dock beetle here)
Garlic mustard flower (Alliara petiolata) is a biennial plant, i.e. it’s a flowering plant that takes two years to complete its biological lifecycle. In its first year it forms clumps of round shaped, slightly wrinkled leaves, that when crushed smell like garlic. In the next year it produces these beautiful cross shaped white flowers in the spring.
Today I saw several Speckled Wood (Pararge aegeria) butterflies! They usually fly from the beginning of April until the end of October – in three overlapping generations! Because they are able to overwinter in two totally separated development stages (Note 1), they have a complicated pattern of several adult flights per year.
Note 1: They enter the caterpillar stage between half May and half September. The growth speed differs significantly between them and some caterpillars grow as much as 3 times faster than others! Those will overwinter as pupae. The ones that emerge from the egg stage and become caterpillars in mid-August will spend the winter as half-grown larvae.
These butterflies are very territorial, and most of those I saw today were males engaged in battles (Note 2). This happens when one male has claimed a nice spot of sunlight that pierces through the trees and another male flies through his sunspot. Note that this only happens if the other male is of the same species, if a male of another kind of butterfly enters the spot he’s totally ignored. If a female flies through the sunspot, the male flies after and tries to mate with her. But otherwise he’ll remain in the same sunspot until the evening (he’ll follow the sunspot as it moves across the forest floor) and then spend the night high up in the trees.
Note 2: If you’ve never seen one of these battles and are now trying to picture what it looks like: to be honest, it looks kind of lame. The “resident” male flies towards the intruder, and then the pair flies upwards in a spiral pattern (no body contact). The one that keeps at it the longest wins. It’s usually over in a few seconds, but the longest documented battle between two male Speckled Wood butterflies went on for 94 minutes.
PS. One of my photos has been published on Natuurfotografie, the #1 platform for nature photography in The Netherlands and Belgium. If you can read Dutch, please take a look here.
There are many “firsts” this time of the year! Here are the first flies of the year as well –
The first picture shows a Flesh fly (Sarcophagidae) sunbathing on a staircase. Flesh flies look a lot like house flies, but are generally larger. They are gray, have a checkerboard pattern on the top of their abdomen, three black stripes running along the top surface of their thorax just behind the head, while house flies have four, and sometimes a reddish-brown tip at the end of the abdomen.
The second picture shows a Yellow dung fly (Scathophaga stercoraria), or – if you want to make the name sound a bit nicer, which could be a challenge for a dung fly – also known as Golden dung fly. I think it’s a female as she has a more of a green tone to her rather than yellow. These flies are very important in the scientific world due to their short life cycles and susceptibility to experimental manipulations, thus have contributed significant knowledge about animal behavior.
Yay, first butterflies of the year! The European Peacock butterfly (Aglais io) usually spend the winters in buildings or trees, and therefore often appear quite early in the spring. Before it goes into hibernation, it convert some of their blood sugar into glycerol which works as a kind of “anti-freeze” during the cold winter. Clever, eh! After hibernation (March or April), it will lay its eggs, often in batches of 500 (!) at a time and several layers deep to increase the chance that some will be protected from desiccation and birds. In the next coming weeks, the adults have lived for almost a year and they die of old age. Around the same time, the caterpillars of the next generation hatch and in July they form chrysalides, in August they emerge as adults, and in September they go into hibernation. And so the cycle goes on!
Note: It shouldn’t be confused with the American Peacock butterfly (Anartia), they’re not closely related.
More interesting information and pictures can be found on this excellent learning site here
Happy Easter everyone!
My beloved Fuji X-T1 can only do double exposures, not multiple as some other cameras can (up to 10, I think?). My workaround was to take several double exposures and then merge them in a software. It was the first time I’ve tried it, but certainly not the last. So much fun to discover and play around with new techniques 🙂 If anyone has any advice on how to take/make ME’s, please share!
(i) Multiple exposure
(ii) Double exposure (in camera)