- Hemlock Sawflies eating the Needles show their larvae eating the needles of a Hemlock tree.
- For more information on these insects look at /sites/default/files/CAT92272711.pdf
- For information about an outbreak of these insects in the Ketchikan area look at /sites/default/files/Hemlock%20Trees%20Show%20Sawfly%20Infestation%20Damage.docx
These videos are free to use for educational purposes. To download them click on vimeo on the bottom right. To view them full screen click on the symbol next to the HD at the bottom. The bullets can be copied and pasted into a word document.
- Insects on Elderberry Plants shows some of the insects I have seen in Juneau coming to the flowers and leaves. These photos were taken in 2019.
- I expected to see huge numbers of insects coming to the flowers and was surprised at how few visited the flowers. I spent many hours looking at the flowers over several days at both sea level and alpine.
- In a very detailed report about these plants they reported: "The number of species of phytophagous insects associated with various shrubs and small trees was reported by Duffey et al. (1974). A total of 19 species was recorded on Sambucus nigra. This was a relatively
- For fascinating information about these plants look at Sambucus nigra L. by MARK D. ATKINSON† and ELAINE ATKINSON
- Also look at Many Plants Have Extrafloral Nectaries Helpful to Beneficials by Russell F. Mizell
- And look at https://www.naturebob.com/what-comes-elderberry
- And https://www.naturebob.com/pacific-red-elderberry
- A Sac Spider Guards her Eggs is a video of a spider with her eggs in a rolled up alder leaf in Juneau, Alaska.
- Joey Slowik identified it as belonging to the genus Clubiona one of the sac spiders.
I was able to keep them in a closed container until the young spiders left the nest.
- Of interest is I looked carefully for the mom, with a binocular microscope, and there was no trace of her.
- I suspect her kids fed on her.
- For information about this behavior, which appears somewhat common among spiders, look at /sites/default/files/Wise20DH20200620Annu20Rev20Entomol_Cannibalism.pdf
- In this book they state: In some spiders juveniles eat their mother before dispersing from the communal nest [termed gerontophagy, or more commonly matriphagy].
- The Alder Woolly Sawfly is an invasive species that eats the leaves of alder. It is becoming quite common in certain areas of the Juneau area this year 2019.
- To learn more about these sawflies look at /sites/default/files/ja_2010_kruse_001.pdf
- And /sites/default/files/Monosoma_pulverata_Retzius_Hymenoptera_Tenthredini.pdf
- Gentians in the Alpine is a short video showing the different species I have seen along the Mt. Robert's trail in Juneau, Alaska.
- I find these flowers and plants quite fascinating. When it is raining, or cool and cloudy they often stay completely closed and only open on sunny days.
- During one mostly cool rainy summer I wondered what might pollinate them. I opened up one flower and discovered they had numerous thrips (a very tiny insect) in them. I have read that these insects can be important pollinators of some plants. I could see where an insect this tiny could force its way into the closed flower.
- I see many of them in complete flower clear up to the end of September when most other flowers have gone.
- It was exciting to find one very tiny Gentian called a moss gentian along the trail. These flowers are only an inch or two tall and very difficult to spot.
- To learn about how the Gentians "anticipate" and respond to changes in the weather look at /sites/default/files/FLORAL%20MOVEMENTS%20IN%20RESPONSE%20TO%20WEATHER.pdf
- Thrips is a collection of images of these amazing insects. Most of the photos were taken in the alpine at about the 2,500 ft level on September 24 in Juneau, Alaska.
- In this area they were very abundant inside the flowers of Broad-petaled Gentian. Apparently these thrips live their entire life inside these flowers and near the plant.
- They are probably very important for cross-pollination of these plants.
- To learn more about the value of thrips for pollinating plants look at /sites/default/files/Thripspollination-anoverview2016.pdf
- Also look at /sites/default/files/Information%20about%20Thrips.pdf
- Temperatures of Juneau Freshwaters on August 12-13, 2019 shows the condition and water temperature of several streams, and ponds along the Juneau Road system.
- With the lack of rainfall and record breaking high temperatures this summer we were concerned about what might be happening to many of the areas where fish live and spawn.
- The high temperatures have been affecting salmon in other areas in Alaska. For information about this look at this article By MARY CATHARINE MARTIN of
- We found some streams were no longer flowing and had very little water. All of these were streams in which salmon, Dolly Varden and in some, cutthroat trout rear in before they go to sea. Probably most of these fish died. This would also be true for any resident Dolly Varden, Cutthroat, Stickleback and Sculpins.
- Jordan Creek, West Creek and a couple streams in the Bridget Cove area were the ones we noticed had stopped flowing. Many of the smaller streams listed in the Bether's et. al. report we had not checked and some of these had probably dryed up also.
- This is the time of year when Pink Salmon and Chum Salmon spawn. Many of the streams we looked at were too low to permit entry of adult salmon. In at least one system, Shrine Creek, it appeared some chum salmon had entered the creek and died without spawning.
- Of interest is one glacial-fed river, Eagle, had lots of chum salmon in the lower areas. These were probably hatchery fish from DIPAC.
- Some of the areas had water temperatures in the sixties and low seventies. This may have contributed to low oxygen levels. This was especially evident in Twin Lakes, Kingfisher Pond, Peterson Creek and Peterson Salt Chuck and a few of the small streams.
- Some small streams had fairly good flow and the temperature indicated they may be fed mostly by springs.
- One of these near the Echo Cove parking lot had been mostly destroyed by off road vehicles.
- For good information about the value of these streams for fish look at Juneau Fish Habitat Assessment by Bethers, Monk and Seifert
- For good information about the importance of oxygen etc for fish in these streams look at Interactive physical and biotic factors control dissolved oxygen in salmon spawning streams in coastal Alaska by Jason B. Fellman1,2 · Eran Hood2 · Sonia Nagorski2 · John Hudson3 · Sanjay Pyare /sites/default/files/2018%20Oct%20salmon%20and%20DO%20Fellmanetal_Aquat_Sci_0.pdf