Archivos de diario de enero 2021

07 de enero de 2021

January 6, 2021 - South side

January 6, 2021 (Wednesday), 11:39am - 1:43pm.
Coverage: Aldercroft Heights intersection to first stop sign.

68 dead newts (of which 3 were juveniles), 0 live newts. Many more dead newts found on the side of the road further from the reservoir. A majority were relatively fresh.

Other roadkill: One very mangled, gelatinous creature, which I'm guessing is a frog.

Weather: Mid 50s, mostly cloudy, started to sprinkle as I left.

Traffic: 22 cars; 7 bikes; 3 pedestrians

One of the dead newts was curious, on the side of the road, not flattened or mangled, but belly damaged, and mostly dried hard, almost feels petrified. I brought them home to finish petrifying.

After spending the better part of an hour putting together these observations, and fixing the way-too-many whose locations were bad, my iNat browser tab blew a gasket and I have to start over, so will get these posted when I have another chance.

Ingresado el 07 de enero de 2021 por newtpatrol newtpatrol | 16 comentarios | Deja un comentario

17 de enero de 2021

January 14, 2021 - North side

January 14, 2021 (Thursday), 1:07pm - 2:49pm.
Coverage: Jones parking lot to second stop sign.

32 dead newts (of which 2 may be juveniles), 0 live newts. Again, more dead newts found on the side of the road further from the reservoir. A majority were dry, except in the moist recesses of the road.

Other roadkill: None noticed

Weather: Low 70s, mostly sunny, still hasn't rained a while - RAIN DANCE!

Traffic: 39 cars; 12 bikes; 2 quarry trucks; 0 pedestrians

I tried a different camera app (OpenCamera), and to my surprise had only one newt's location be a bit off the road, none ended up in Bear Creek Redwoods. Not sure if it's due to the app or something about being on the north side.

Not much to report otherwise. It's been a long time since I've done the north side. It feels shorter, but also like there's so much more traffic, and blind curves. Always tradeoffs.

Ingresado el 17 de enero de 2021 por newtpatrol newtpatrol | 4 comentarios | Deja un comentario

January 16th, 2021 - South Side

Saturday 9:20-12:35 pm: 34 dead newts found, 2-3 juveniles. no live newts.
Weather - sunny. Cold at first, then really warm! It's been a while since the last rain... Rain MTD 0.48 in, YTD 3.63 in per http://www.weathercat.net/wxraindetail.php
I documented 34 dead newts, 2 of them juveniles (I think there was another one). Some were dry, others were a bit more fresh. I found a few tails on the road, that were obviously part of a newt once. @truthseqr was kind enough to compare them with the previous survey, and found out that only one of them was a duplicate (and therefore deleted).
Other roadkills: a few Jerusalem Crickets, centipedes, millipedes, snail, slug, and a piece of the famous skunk.
Coverage: south part - from Aldercroft Heights Rd to the first stop sign.
Busier than I expected, mainly because of 2 car races - Traffic: 64 cars (including SJJJ), 5 motorcycles, 70 bikes, 9 pedestrians, and 4 cars parked by the road. Seems like most cars drive north, and most bikes go south.
I saw the HTH team on their way to #6, after I already passed it. I didn't see anything in their traps or dead near the traps.
I hiked down to Soda Spring creek to see if I can spot any newts, but I didn't see any. I thought it looked like good newt habitat, with fresh water flow, and quiet spots.
A link to all my observations from the survey:
https://www.inaturalist.org/observations?on=2021-01-16&place_id=any&subview=grid&user_id=merav&verifiable=any

Ingresado el 17 de enero de 2021 por merav merav | 1 comentario | Deja un comentario

18 de enero de 2021

January 17, 2021 - North Side

Sunday, 8:15 am - 10:30 am.
Weather: 49F, sunny.

Documented 21 dead newts, no juveniles. No live newts observed.
Found 1 alive one in one of the pitfall traps(Randomly looked at a few buckets, not all of them) and 2 dead ones in the HTH survey sites, since my day started earlier than theirs. When I met them on my way back they were at survey site # 2 and said they had found 1 dead, 1 alive. They said since rains are expected next week, the numbers will rise next week.

Other documented roadkill: Jerusalem Cricket

HTH Survey site observations:
https://www.inaturalist.org/observations/68254533
https://www.inaturalist.org/observations/68254544

Documented human activity:
Moving Cars: 87
Pedestrian: 50
Bikes: 28
Motor bikes: 0
Trucks: 0
Parked cars: 46

Notes:One of the observation was just outside the entrance for the rowing club. This one was a crazy one to document since the clock was inching towards 10' o clock and there were so many frantic parents rushing to drop their kids for their rowing lessons. As soon as I would squat, cars started coming in all directions(with parents leaving after dropping their kid), so I had to wait for a while before all the parents had dropped their kids to take a decent photo.

2 people stopped to ask about what I was doing. Of which one inquired about the use of the buckets that HTH had in place at their survey sites. Passed by 2 cars from Santa Clara County Parks and they flashed the peace sign hand on making eye contact.

Link to all my observations for today:
https://www.inaturalist.org/observations?on=2021-01-17&place_id=any&q=roadkill&user_id=karangattu&verifiable=any

Ingresado el 18 de enero de 2021 por karangattu karangattu | 2 comentarios | Deja un comentario

08 de enero de 2021

January 7, 2021- north side

98 dead newts (of which 3 were juveniles), 0 live newts.
January 7th, 2021 (Thursday) 10:20am-12:20pm. Meant to get out Wednesday morning but had some knee issues.
Weather: Completely overcast with fog, 54F. Rained the previous afternoon.
Other roadkill: 1 Jerusalem cricket.
Coverage: County parking lot to second stop sign.
Rainfall: MTD 0.46in, YTD 3.61in (per http://www.weathercat.net/wxraindetail.php?year=2021)
Traffic: 23 cars, 14 parked cars, 6 bicycles, 3 walkers. Quietest day in a long time.
Midpen study: Pit traps were emptied before I arrived, and there were no roadkill newts in their road sections.

Hardly any of the newts were fresh, most were rehydrated crackers.
My observations for today: https://www.inaturalist.org/observations?captive=any&on=2021-01-07&place_id=any&subview=grid&user_id=sea-kangaroo&verifiable=any

Newt map (with obvious "holes" where the midpen study plots are!):

Ingresado el 08 de enero de 2021 por sea-kangaroo sea-kangaroo | 6 comentarios | Deja un comentario

01 de enero de 2021

Pacific Newt Roadkill and Rainfall (Nov/Dec 2020)

The following charts show Pacific Newt roadkill at Lexington Reservoir and cumulative rainfall amounts (measured in inches) for each of the four migration seasons we've been surveying. We use the Weathercat website based in Santa Cruz for rainfall and temperature info due to its proximity to Lexington Reservoir and its convenient numeric format which is easy to copy into Excel for analysis purposes.

Notice the relatively low amount of rainfall for Nov/Dec 2020 in (Figure 2). This correlates with the lower newt mortality we're seeing for these months (Figure 1). Also, the HTH population study accounts for some of the reduction, since they have only shared a few observations with us to date from the extremely high mortality sections of the road they've included in their study.

Rainfall-Dec

Ingresado el 01 de enero de 2021 por truthseqr truthseqr | 0 comentarios | Deja un comentario

09 de enero de 2021

Jan 9, 2021 - North Side

January 9th (Saturday) 2021 08:15 am -11:34 am
Weather: 42F, mostly sunny

Documented 52 dead newts, 2 of which were juveniles. No live newts observed.
Did not find any dead newts on HTH survey sites since they were ahead of me. They did mention when they passed by that they found a few dead ones and 4 live males in the pitfall traps(all heading towards the water).

Other documented roadkill:
4 centipedes, 1 Jerusalem cricket, 1 moth

Also spotted a dead Western Screen Owl on the road(but it was not due to roadkill, it seemed this one fell out of the sky)

Documented human activity:
Moving Cars: 128
Pedestrian: 52
Bikes: 48
Motor bikes: 1
Trucks: 0
Parked cars: 71

Notes: The road had a lot of traffic today, can be because it was a sunny day but can also because I saw a lot of beginners on the row boats in the reservoir(Introductory session maybe)
3 hikers stopped and asked me about what I was doing. One person said he loves the newt patrol. One person said he had stayed in that area for more than 25 years and he used to see a lot of newts and cottontail rabbits but does not see them as often anymore. And he thought we were doing the lord's work documenting this tragedy. One hiker asked what should she do if she found a dead newt on a trail, I said just leave it as is since we are only documenting roadkill. She thought the HTH buckets were to dump dead newts.

Also I was scanning car tires for signs that deep treads might carry the newts some distance. And in one instance of a truck with huge tires, I found some evidence.
20210109-110714

20210109-110727

Link to all my observations:
https://www.inaturalist.org/observations?on=2021-01-09&place_id=any&q=roadkill&user_id=karangattu&verifiable=any

Ingresado el 09 de enero de 2021 por karangattu karangattu | 9 comentarios | Deja un comentario

21 de enero de 2021

January 20, 2021 - North side

January 20, 2021 (Wednesday), 1:07pm - 2:20pm
Coverage: Jones parking lot to second stop sign.

2 dead newts, 0 juveniles, 0 live newts. Both found on the side of the road further from the reservoir, and very dry.

Other roadkill: None noticed

Weather: Low 70s, mostly sunny, still hasn't rained - MORE RAIN DANCE!

Traffic: 42 cars; 8 bikes; 2 quarry trucks; 2 pedestrians

It goes quickly when there are hardly any newts!

Ingresado el 21 de enero de 2021 por newtpatrol newtpatrol | 4 comentarios | Deja un comentario

10 de enero de 2021

How to Measure SVL using ImageJ software

The ImageJ software, developed by the NIH, is a freeware tool for analyzing photographs. It is a useful tool for our purposes of measuring snout-to-vent length (SVL) of Pacific newts, especially those that are curved. Here are instructions for using ImageJ to calculate SVL:

(1) Download the ImageJ software from the NIH website: https://imagej.nih.gov/ij/download.html. The download includes a detailed (and somewhat overwhelming) user's guide of all the software's features & capabilities. Don't worry - we only need to use a few simple features.

(2) Make a copy of an iNat newt picture and save it on your computer. To do this:
--> Right-click on the picture in iNat and select "Save Image As..."
--> I use the 8-digit iNat ID as the file name so I can later go back and enter the SVL (snout-to-vent-length) value.

(3) Launch the ImageJ software. You'll see the ImageJ toolbar on your desktop.
(4) Select File --> Open... and open the newt picture.
(5) Right-click the line tool on the toolbar and select "Straight Line."

Analysis-2

(6) Draw a line on the measuring device in the picture (for example, 1 inch). See the yellow line on the ruler below.

Analysis-2b

(7) Select Analyze --> Set Scale... The "Set Scale" dialog is displayed.
--> Enter the "Known Distance" and "Unit of Measure."
--> Click OK.
Analysis-3

(8) Right-click the line tool again, but this time select "Segmented Line."
--> Double-click on the tip of the newt's snout to start the segmented line.
--> Click to place pivot points along the segmented line.
--> Double-click to stop at the newt's vent. Refer to this drawing:
Diagram for measuring snout-to-vent length (SVL)

(9) Select Analyze --> Measure. The calculated length is displayed in the Results dialog box.
Analysis-7

(10) According to the cutoff of 50 mm (2 in) suggested by @tyap and other herpetologists, this newt would be categorized as an adult. In iNat, set the "Life Stage" Annotation to "Adult" and add the Observation Field "SVL" along with the value calculated by ImageJ.

Ingresado el 10 de enero de 2021 por truthseqr truthseqr | 5 comentarios | Deja un comentario

02 de enero de 2021

January 2, 2021

Jan 2nd, 2021 - Southern Sector
Saturday 9:08-11:20 am: 17 dead newts found, no live newts
Weather - overcast/partial sun. Very light sprinkle for 2-3 min.

I documented 17 dead newts, no juveniles. Most of them were very fresh, others were a bit more weathered, one the color of mud. 12 of the observations were made on the uphill side of the road, 5 on the reservoir side.
Other roadkills: 1 skunk and a banana slug.
Coverage: Southern sector - the Aldercroft Heights to the second stop sign.
Fairly light traffic, when compared to the northern sector - Traffic: 23 cars ( including 2 Ranger trucks, 2 HTH Biologists, 5 bikes, 7 pedestrians, and 2 cars parked by the road.

*Edited to fix date.

Ingresado el 02 de enero de 2021 por joescience1 joescience1 | 3 comentarios | Deja un comentario