WA Lakes Biotic Survey

#16
Roger,
The different colored dragonflies we see each summer, are they of the same family/kind or are each color of a different family/kind?
 
#17
Big surprise for me was the "Odonata (Dragonfly) 1" Does this indicate only 1 specimen was found in 30 lakes sampled? Or is it 1 family of them found. I'd be really interested in the density estimates of each. And more important to me, the relationship of those. Or which one's the trout were keying on.

Great info, sounds like I need to get a stomach pump and bone up on my entomology.
If you skim the list there are several Odonates listed (including damsel nymphs). However, if you add them up they are still a tiny fraction of the Diptera (chironomid) numbers. I think Irafly made the observation last spring that trout are either "looking for skittles or hoagies" referring to chironomids and leeches/dragon nymphs, respectively. And where are leeches on that list? They are invertebrates, no?
 

Taxon

Moderator
Staff member
#18
Hi Scott,

Roger,
The different colored dragonflies we see each summer, are they of the same family/kind or are each color of a different family/kind?
As a gross generalization, the brighter colored ones are males, and the duller colored ones are females. Those likely to be found in WA are listed on my PNW Dragonflies page.

Also, Slater Museum, which is associated with the University Of Puget Sound, maintains a Western Odonata Scans In Life web page, where you can view wonderful photos of Western dragonflies.

Hope this answer your question.
 

Taxon

Moderator
Staff member
#19
troutpocket-

And where are leeches on that list? They are invertebrates, no?
Yes, they are invertebrates, and they are on the list as follows:

Rhynchobdellida (Freshwater Leech) 31
Arhynchobdellida (Worm Leech) 7
Glossiphoniidae (Turtle/Snail Leech) 2
Rhynchobdellida (Turtle/Snail Leech) 1
 
#20
Holy Moses Roger! I had no idea there were so many dragonflies. Thanks for the links.
This summer a few dragons are going to be in danger of Scott taking a closer look.
 

Taxon

Moderator
Staff member
#23
Roger,

In the reports do they indicate/note which lakes have the greates preponderance/biomass/i.e. most feed of these bugs?

Dave
Hi Dave,

The report from ECY doesn't address the biotic survey at all, because it was prepared before EPA finished performing the biotic analysis. As to whether or not some calculation of biotic mass is included in the EPA database, I don't really know, as I was given only what I requested, and didn't request that.
 
#24
Hi Dave,

The report from ECY doesn't address the biotic survey at all, because it was prepared before EPA finished performing the biotic analysis. As to whether or not some calculation of biotic mass is included in the EPA database, I don't really know, as I was given only what I requested, and didn't request that.
Well why the hell not!
Just kidding, but it seams like a useful bit of info to have.
 

Upton O

Blind hog fisherman
#25
Roger, I've reflected several times on how much more efficient today's computers make research. Back in the day we gathered the data, recorded it on forms, usually using pencil on waterproof paper since it was always wet where we were working. We then gave the data to a key punch specialist who would punch it onto cards. The cards were then given to a computer specialist to run through computers that took up half of a room and chugged out reams of paper which then had to be read, analyzed and interpreted. Then the writing started, usually longhand to start. Then it was retyped with something called a typewriter, no internal or disc storage either, so you had to keep a second copy somewhere. Then it was edited, re-typed and submitted for review. After review it was re-typed and submitted to whomever needed it. Yeah, scientific research is definitely easier with computers. But you still have to identify and verify all of those tiny, little critters one by one...ugh. I never was much of a taxonomist, there's just two types of inverts: those that make good fish food and those that don't. You guys with the attention for detail have all of my respect.
 

Taxon

Moderator
Staff member
#26
Yes Karl, I certainly agree with everything you just said. As you likely realize, my comments on #15 concerning use of the PC were intended as tongue-in-cheek humor.
 

Upton O

Blind hog fisherman
#27
Hey Roger, it was tongue-in-cheek, well done. I get to remembering and then am totally amazed at technology now. What a gift.