Aquatic insects

Large water lovers (Hydrous piceus) are happy to eat filamentous algae, can damage aquarium aquatic plants. And their larvae specialize in snails, I have them most willingly ate coils. I raised larvae from the second instar to beetles. The pupa has interesting outgrowths on the sides of the pronotum, 3 pairs directed up and back. Unlike a swimmer, a water lover needs to hold on to something to turn his head up in order to get air. Therefore, there should be twigs or plants in the aquarium (otherwise you will not be able to get air and the beetle may die).
Small water lovers are predators of both beetles and larvae.
When keeping a gladysha, a cover glass is necessary, because it takes off from the water. It eats anything of suitable size that lives in the water column or on its surface.
Scorpio is an ambush hunter, and it needs places near the surface of the water (because it breathes through a tube), where it can sit and wait for prey.
I like to breed dragonflies of large species from larvae. Their transformation is an unforgettable, fantastic sight.

I like to breed dragonflies of large species from larvae. Their transformation is an unforgettable, fantastic sight.

And when do they most often get out of their skins? At dusk or whatever?
And more. Stierlyz, probably still aquatic insects, not water

This post was edited by scarabee - 04/24/2007 06: 48

When I was a child, I used to keep a fringed plavunets (I don't remember Latin) together with ordinary newts. So the bug ate them all. Moreover, he ate only up to half, the head and front legs always remained...

And when do they most often get out of their skins? At dusk or whatever?

In nature, like in the morning.

It also happens in the evening. I saw it at the rocker arm. As for the swimmers, I constantly see them eating little frogs.

Moreover, he ate only up to half, the head and front legs always remained...
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I had such a cartoon with one praying mantis, a female. I threw grasshoppers at her, and she first ate all the grasshoppers except the wings, and then began to eat only the belly, and then threw out the rest and caught the next one. And they say that they are not thinking straight.

I had the same story with mantises. In grasshoppers and flies, they really ate only the belly, the head and chest remained intact. And they generally perceived ordinary domestic cockroaches as an insult to honor and dignity. They made a face of displeasure and turned away.

And when do they most often get out of their skins? At dusk or whatever?

According to my observations, among the dragonflies of the genus Rocker (I mainly observed A. juncea, A. grandis), most of them hatch in the evening before dark (21: 00-23:00) and in the morning (3:00-5: 00). About one in five or seven larvae turns in the daytime, and, as I remember, in the afternoon.

A new book was recently published:

Diapause in Aquatic Invertebrates: Theory and Human Use.
Alekseev, Victor R.; De Stasio, Bart; Gilbert, John J. (Eds.)

Series: Monographiae Biologicae , Vol. 84. 2007, XIX, 257 p., 41
illus., 1 in colour, Hardcover, ISBN: 978-1-4020-5679-6б 119,95 Eur

http://www.springerlink.com/content/wt5132...65564a1d3f&pi=0

Below I give its table of contents. I was able to get pdf files of all
the chapters. If anyone needs it, write to me at musolin@gmail.com And I'll send it.

With respect,

Dmitry.


Diapause in Aquatic Invertebrates: Theory and Human Use.
Alekseev, Victor R.; De Stasio, Bart; Gilbert, John J. (Eds.)


PART I: STRATEGIES AND MECHANISMS OF DIAPAUSE IN AQUATIC INVERTEBRATES

1. Introduction to Diapause 3
Victor R. Alekseev, Oscar Ravera, and Bart T. De Stasio

2. Timing of Diapause in Monogonont Rotifers: Mechanisms and Strategies 11
John J. Gilbert

3. Diapause in Crustaceans: Peculiarities of Induction 29
Victor R. Alekseev

4. Reactivation of Diapausing Crustaceans 65
Victor R. Alekseev

5. Diapause in Aquatic Insects, with Emphasis on Mosquitoes 83
Elena B. Vinogradova

6. A Brief Perspective on Molecular Mechanisms of Diapause in Aquatic
Invertebrates 115
Victor R. Alekseev

PART II: THE ROLE OF DIAPAUSE IN SCIENCE AND HUMAN USES

7. Egg Bank Formation by Aquatic Invertebrates: A Bridge Across
Disciplinary Boundaries 121
Bart T. De Stasio

8. Use of Cladoceran Resting Eggs to Trace Climate-driven and
Anthropogenic Changes in Aquatic Ecosystems 135
Susanne L. Amsinck, Erik Jeppesen, and Dirk Verschuren

9. Reconstructing Microevolutionary Dynamics from Layered Egg Banks 159
Luc De Meester, Joachim Mergeay, Helen Michels,
and Ellen Decaestecker

10. Does Timing of Emergence within a Season Affect the Evolution of
Post-diapause Traits? Post-diapause and Directly Developing Phenotypes
of Daphnia 167
Kestutis Arbacˇauskas

11. Diapause and its Consequences in the Daphnia galeata – cucullata –
hyalina Species Complex 177
Piet Spaak and Barbara Keller

12. Role of Diapause in Dispersal of Aquatic Invertebrates 187
Vadim E. Panov and Carla Caceres

13. The Role of within Trophic Level Chemical Interactions in Diapause
Induction: Basic and Applied Aspects 197
Egor S. Zadereev

14. Studying the Phenomenon of Dormancy: Why it is Important for Space
Exploration 207
Victor R. Alekseev, Vladimir N. Sychev, and Natalia D. Novikova

References 215

Index 255

And who kept the water meter in the aquarium-a thread?
I wonder if they will escape from the aquarium through the gap between the aquarium and the cover glass... And what is the best way to feed them? And how do they eat-suck the insect out or gnaw it? And can they eat small snails near the surface of the water?
I kept a water scorpion out of the water and fed it raw meat. Of course, I also kept dragonfly larvae in my childhood ( how can I not catch such a cool animal! ),
but for some reason they died when I left the water...

This post was edited by Vladimirrr - 05/23/2007 01: 59

water meters are often kept for experiments. ogi can not GNAW, because they have a sucking oral apparatus. they feed on flies, although they are polyphages. the aquarium is closed, but the gap is usually put, it seems (I can look or ask if necessary).

When keeping water meters, the aquarium should be covered with glass, because imagos fly well. You also need objects that protrude above the surface of the water - for example, flat stones, or plants with floating leaves (vodokras or similar non-dried aquarium plants-limnobium, nymphaeum). Water skaters like to get out on them from time to time. They also lay their eggs on surface objects (I had them laid on rocks that protruded from the water), gluing them several times at the level of the water surface. Egg development takes about two weeks, and babies eat insects that have fallen on the water in the same way as adults.

Ask if possible. Otherwise they'll run away...
--- usually they cover part of the top with glass, the rest with a grid, and the po can really jump out or fly away.


--- they feed flies-large water-fish with large flies, small ones with fruit flies. A little pinned down so they can catch. Or small cockroaches. They are polyphages.

Can they walk on glass like flies?
- - - no.


And what kind of experiments?
--- they study a lot of things. For example, sexual dimorphism, eco-physiology and seasonal development, what controls the change of wing forms (short-winged and long-winged) and the induction of the wintering state (diapause) [much of this is controlled by daylight length - photoperiodism].

Do all water skaters fly?
--- there are species (for example, marine) that are always wingless. Winged ones can usually fly quite well. Many species are polymorphic - i.e. there are winged and wingless (or short-winged) individuals or even generations. There is also a wing muscle polymorphism = = when some long-winged individuals do not have developed wing muscles and are not able to fly (this energy is directed to reproduction).


Another question - do water skaters bite? And then I once picked up gladysh...
--- theoretically, they probably do, but they don't do it

A bit of advertising on the topic - in the coming months, St. Petersburg State University will publish our nkiga just on this topic:

S a u l i h A. Kh., M u s o l i n D. L.
Seasonal development of aquatic and near-water hemipteran insects (Heteroptera). St. Petersburg: Publishing House of St. Petersburg State University, 2007, 202 p.
ISBN 5-288-

The monograph summarizes for the first time data on the seasonal development of aquatic and near-water hemipteran insects of the world fauna (5 infraorders Hemiptera: Heteroptera). General characteristics of water-related species are given and the main elements of their seasonal cycles (active development, diapause, migration, seasonal polymorphism in the degree of wing development, wing musculature, and coloration) are considered. Typical examples of species are given for each family and their seasonal cycles are described.

The book is intended for researchers-zoologists, entomologists, ecologists, hydrobiologists, as well as postgraduates and masters of biological faculties of universities. It can be used as a training manual.


When it actually comes out, I will let you know in this topic how it can be purchased.

Pictures:

Oblozhka_maket.jpg — (189.06к)

We are waiting for a book on the topic of water skaters have never been bitten.. although the proboscis is quite powerful in them.

Thanks for the info. And they can't live without wintering, or just won't breed?
I caught a water skater today that looks like geris thoracicus. Planted in an aquarium where there are no predatory inhabitants. It now runs on the surface, jumping on duckweed... and it keeps crashing into the windows. I didn't use the net to seal up the gap yet - I don't think she'll be smart enough to escape through it.
Doesn't want to eat - threw her a half - dead mosquito-ignores it. Probably not adapted yet... (?)

And they can't live without wintering, or just won't breed?

-- many species should be able to. Only some water strikers have an obligate diapause (mandatory, requiring a cooling period). So with a long light day, most species must develop and reproduce without diapause.

I caught a water skater today that looks like geris thoracicus. Planted in an aquarium where there are no predatory inhabitants. It now runs on the surface, jumping on duckweed... and it keeps crashing into the windows. I didn't use the net to seal up the gap yet - I don't think she'll be smart enough to escape through it.
Doesn't want to eat - threw her a half - dead mosquito-ignores it. Probably haven't adapted yet... (?)

-- Geris thoracicus is a polyvoltine species, i.e. it gives several generations, i.e. the diapause is not obligate.

To jump out or fly out, they need a "run-up". This also depends on the ratio of the height of the space above the water and the area of the aquarium.

This post was edited by Musolin - 25.05.2007 03: 07

Alas, but the run-up was enough... A water skater escaped. I couldn't find her in the room.
I will look for wingless ones or put a grid in some way.

Oh, I've been holding a fringed swimmer for a long time... For two years he swam in an aquarium (: In the summer he caught small tadpoles, fry, and in the winter, as it is not funny, he willingly ate pipefish for aquarium fish (:
But he died... Now I want to find the larva of anax or eshna, but I just don't understand what reservoirs they should be found in... Can you tell me?

I larvae rocker from any pond in the villages pulled out) and not a little)

Now I want to find the larva of anax or eshna, but I just don't understand what reservoirs they should be found in... Can you tell me?

In theory, in any non-flowing body of water larger than a puddle. And the larvae of beauties-in the rivers.

This swimmer probably needs to be kept alone, in a separate aquas - everyone will be devoured otherwise. I wanted to catch a water-lover earlier (I think that's what they call this beetle) they're kind of cool. But the larva is kind of predatory?

Sps to all... And another similar question: where can I find ranatra? Never met

Sps to all... And another similar question: where can I find ranatra? I've never met him

Ranatra I personally came across several times only in clean water bodies.. or rather, in Meshchera in the white lakes, I haven't seen it anywhere else.

Sps to all... And another similar question: where can I find ranatra? I've never met him

In the swamps near Moscow repeatedly.
Here, for example, are ranatra eggs on a water lily leaf in the Sima swamp near Zvenigorod:

Pictures:
  ranatra.JPG — (53.73к) 27.05.2007 — 10.06.2007

Caught another water skater (pictured). Conditionally defined it as Gerris rufoscutellatus. You can't compare it with the first one. The one that escaped all the time jumped on the glass like a flea, and this one has studied the territory and calmly swims without making attempts to leave the aquarium. Although perhaps this calmness is caused by the fact that she ate very tightly (the photo shows a sickly belly). Among other things, it is also twice as large. The wings are stiff, but they don't seem to be functional.

This post was edited by Vladimirrr - 28.05.2007 23: 55

Pictures:
  vdm.jpg — (36.03к) 28.05.2007 — 11.06.2007

The offspring will be here soon.

so I think that she did not eat badly, but took a good walk!

And at what time in the ponds can you already look for large swimmers? Already? (:

And at what time in the ponds can you already look for large swimmers? Already? (:

Of course!
If you mean beetles of the genus Dytiscus, then they can be very successfully searched in small temporary reservoirs (puddles) starting from the earliest spring. Personally, this spring I caught just a few D. marginalis in a puddle, 1 female D. circumcinctus, and in a forest lake (April 1 ) quite by accident - D. dimidiatus.
Smaller swimmers, such as Colymbetes, Acilius, Ilibius, etc. they also get caught in puddles.
And now all of them can be found in larger reservoirs-so take a water net in your hands and go ahead

With the second water skater I was more lucky in the morning I found it... on the floor.
The beast was released where it was caught. Well, I'm still thinking about how to fasten the grid.
I thought along the way that they don't even need aquas (?) they don't need deep water, so you can take a large tray with a grid at the top...(?)
After a relatively long search, I found and caught another rod-shaped water skater - a calm animal. But when I put her in a jar, it turned out that she could walk on glass... I had to let her out.
And what is the biggest water skater? There are probably some giant water skaters in the tropics...

 
After a relatively long search, I found and caught another rod-shaped water skater - a calm animal. But when I put her in a jar, it turned out that she could walk on glass...

and what kind of view is this? From Gerridae ? Or Hydrometridae ? And tell us about the glass - was it vertical ? Heavily polluted? This is asked by a colleague of mine-he deals with the mechanisms of attachment to the substrate and says that water striders have nothing in their legs that would allow them to walk on clean glass...

 
And what is the biggest water skater? There are probably some giant water skaters in the tropics...

From sem. Gerridae are the largest - 36 mm (the smallest-1.6 mm). The length of Gigantometra gigas ' legs reaches 120 mm.

And where is Gigantometra gigas found?

Rod-shaped water skater is the most common that we have-Hidrometra gracilenta.
She walked on the glass, of course, not like a fly, the glass is vertical (bank), wet. I think it was because it was wet that she walked on it, and her weight is very small, so nothing fancy, just ordinary water-meter paws...

They were right when they said that the water skater was pregnant!
Today I found more than 15 small water meters in Aqua.
The gap under the cover glass was closed almost completely by putting on the edges of the aqua cut along the compressor hose. I hope it helps.
And what to feed such a trifle? They are smaller than fruit flies!

Although they are small, but terribly predatory. Throw them a midge from a houseplant or some other very small one. Press it down a little to keep it moving, and throw it in. They're all going to jump her. I've seen it happen in nature more than once.

And where is Gigantometra gigas found?

South China and Vietnam

alex017, I found an insect from catching which is very useful - mosquitoes. Eat! And if the mosquito is actively moving - they are afraid, and one stumbled upon the corpse by accident and began to move it, and another one jumped on this movement...

Musolin, thank you for the info.
Insects are brought from China, maybe there is a Gigantometra gigas on sale somewhere... (?)

The water skaters have already faded once-clearly increased in size. True, there were fewer of them than there were. I saw one drowned. I have a question - modomerki do not eat each other?

they don't have to, but things happen, especially when you're molting... make sure that there is enough food. There is always a mortality rate...