Archive for January, 2019

Special Cookies

January 17, 2019

Someone gave my wife and I special cookies for Christmas.  They contained tetrahydrocannabinol, the psychoactive ingredient found in recreational marijuana. From the age of 18-30 I almost always possessed marijuana, but I am now 56 years old, and I have not been a regular pot-smoker since I was 29.  I’ve only smoked pot once in the last quarter century and that was from a roach I found discarded near a construction site.  My wife had never even tried marijuana.  Whenever I suggested to my wife that I smoke marijuana she usually got mad at me or told me to wait until it was legal in Georgia.  Her main objection was the illegality of it, though  I never got busted in all the years I smoked pot, except for the time my mom found my stash and flushed it down the toilet.  Nevertheless, I always honored her wishes and part of the reason I originally hooked up with her was because she did not share my enthusiasm for mind-altering drugs.  I decided it would be better for my health, if I was with someone who didn’t want to get high all the time.  So I was shocked when she ate the whole cookie without even consulting with me.

I’ve read that modern marijuana products are much more potent than they were when I was a regular pot-smoker, and I was more cautious than she.  I just ate half of the cookie and planned to eat the other half a few days later on my weekly drinking night–I normally drink a big bottle of white wine every Thursday.  The cookie caused my wife to become giddy and giggly for a short period of time, then she acted quite inebriated for hours.  She told me it felt like she was very drunk.  She actually seemed semi-comatose, and I realized the drug might be interacting with the Prozac she takes.  The next day I researched the interaction between the 2 drugs and learned the combination of marijuana and Prozac can cause either mania or sedation.  It was definitely the latter for her.  I didn’t like my wife on marijuana because she wasn’t bossing me around like she normally does, and I missed that.  She didn’t start bossing me around as usual until about 6 hours after she ate the cookie. (My wife is an overbearing, bossy, brunette–I guess you could say that’s my type.)  I suggested from now on, if we indulge in special cookies, she should just eat half and give me the other half, but she didn’t agree.

Image result for Marijuana store inside

The inside of a legal marijuana dispensary in Colorado.  Edibles are an alternative way to ingest the drug for people who don’t like to smoke.

I could tell a definite difference between marijuana and alcohol–perhaps because I had so much more experience using it.  It was trippy, more like LSD than alcohol; and indeed marijuana is classified as an hallucinogen, while alcohol is a depressant.  In all the years I smoked pot I had never tried an edible.  It took longer to feel the buzz, but I felt just as high.  It seemed weird because I’m used to just alcohol now, though I used to combine the 2 all the time.  The situation I found myself in was also strange.  Back in the day when I smoked pot, I often hung out with peers–cool dudes my own age with similar interests.  But instead I was with relatives–mostly fat old ladies in dodgy health.  When I was younger I would do something after I smoked pot.  I would go to a rock concert or a party or I would go to a bar and strike out with the chicks.  I even would go to work while stoned.  But here I was stuck inside a house with nothing to do.

I noticed more differences between alcohol and pot when I ate the rest of the cookie a few days later.  I started to drink a bottle of red wine and realized I was high enough that I didn’t need it.  I began drinking much more slowly than I normally do.  I became totally paranoid about the internet.  I had a sudden revelation that now the government and the public knows everything about me.  All a person has to do to learn about my personality is look at who I follow on twitter–a few celebrities but mostly sex workers and drug dealers.  This either never occurred to me when I’m drunk or perhaps I just didn’t care, but now I was concerned.  When I used to smoke pot there was no common use of the internet, and this was something new, and I started imagining how the government could spy on everybody through the internet.  Of course, when I sobered up the next morning I didn’t care any more and I was ok with the entire world knowing I’m a fucked up fucker. Besides the government and the public are just not that interested in me.

Alcohol makes me feel overconfident and decisive; marijuana makes me feel just the opposite.  Maybe that’s why they are such a good combination.  It’s kind of a balancing act.  Normally, after I wash dishes during my Thursday night drinking bout, I go watch music videos on youtube, and I know exactly what I want to listen to.  But when I was stoned I couldn’t decide which song to choose.  However, the internet thinks for you sometimes (a scary thought that contributed to my paranoid revelation), and youtube picked songs for me from my past history.  So I sat there and let it choose.  Incidentally, time distortion, another THC intoxication symptom, made dishwashing worse.  It felt as if I was in hell, stuck washing dishes forever.

After watching youtube videos I usually watch the television series, Supernatural, with my wife for an hour and take a break from drinking.  It was a rerun and I could barely follow it.  The effects of the marijuana began to dissipate, and I started drinking faster.  I know I went to listen to music CDs, but my memory of what I did the rest of that night is totally gone.

 

Advertisements

Georgia Before People has Run out of Gas

January 15, 2019

This is just an heads up.  The future content of my blog is about to change.  I started this blog during March 2010 to promote my self-published book of the same name.  I really enjoyed producing new blog entries, and in many ways I think the blog was better than the book itself.  Deciphering the latest scientific journal articles related to my subject into language a layman could understand became 1 of my favorite hobbies.  I’ve managed to keep the focus of my blog on the paleoecology of southeastern North America or at least on any natural history remotely related to it for 9 years, but I just can’t do that any more–there just isn’t enough new scientific literature available.  I’m too prolific and professional paleoecologists can’t keep up.  I’m still fascinated with this obscure topic.  However, I’m tired of relying on speculation, and it seems as if I’m becoming too repetitive.  I feel like I’ve beaten a dead horse until it has turned into an unrecognizable bloody pulp.  Back in November I wrote an 800 word blog entry, then realized I’d already written about the same study a few years earlier.  I just re-blogged the original essay instead of posting a different version of it.

Translating scientific studies also puts a crimp in my writing style.  Because the science isn’t always definite, I’m forced to write awkward phrases such as “the authors of the study suggest…”  too often.  I never want to write that phrase again.

I will still write essays for my blog, but they will no longer be focused on the obscure topic of paleoecology.  I’ll still write about natural history once in a while, especially if there is a new discovery of a Pleistocene-aged fossil site in Georgia or if I have a particularly interesting idea.  But no Pleistocene fossils have been discovered in Georgia since 2006.

I’ve been reading a lot of biographies lately.  I’ll probably write more about people, history, pop culture, food, and (I’m sorry) politics.  My output may or may not become more irregular.  Nothing lasts forever.

The Last Glacial Maximum in the Georgia Piedmont–My Abundant Oases Hypothesis

January 13, 2019

Scientists estimate average annual precipitation in Georgia was just 15 inches during the Last Glacial Maximum (~24,000-~19,000 calendar years BP).  I’ve kept a rain gauge in my backyard here in Augusta, Georgia for 17 years, and I’ve carefully recorded precipitation.  Average annual precipitation in my backyard was 47.8 inches over this time period.  The driest year in my records was 2010 when just 29.5 inches of precipitation fell, and the wettest year according to my records was 2017 when 69.8 inches of precipitation fell.  The difference between present day precipitation totals and LGM precipitation suggests the floral composition must’ve been considerably different then, and many modern day species of plants must’ve retreated to small refugia.  However, there is no evidence of this, and in fact a couple lines of evidence indicate species abundant today were just as widespread during the LGM.

Genetic evidence shows that species common in deciduous forests occurred all the way to the glacial boundary during the Ice Age, despite pollen records indicating spruce forests dominated the landscape from north Georgia to the Ice Sheet.  DNA studies of eastern chipmunks, red and sugar maple, shagbark hickory, beech, and yellow birch suggest they all ranged right up to the edge of the glacier which expanded all the way to southern Ohio.  The ranges of at least 17 species of trees including persimmon, sweet gum, and river birch still reach their northern limits at the ghost boundary of where the massive glacier advanced.  (See: https://markgelbart.wordpress.com/2017/03/30/the-ghost-boundary-of-the-last-glacial-maximum-ice-margin/ ) Although genetic evidence reveals discontinuities between populations of species, these appear to be caused by geographical barriers such as major rivers and the Appalachian Mountains.  The genetic evidence suggests multiple diffuse refuges during the LGM for species that are common today.  It seems like a paradox, but I have an hypothesis that can explain this for the Georgia piedmont.  I call it my Abundant Oases Hypothesis, and it can probably be applied north of Georgia as well.

First, temperatures were much cooler during the LGM, so an average annual precipitation total of 15 inches would have gone much further then.  Evapotranspiration rates were much lower, especially during summer.  15 inches of rain and snow may have been the equivalent of 25 inches in today’s climate–similar to an average drought year today.  Second, Georgia’s piedmont soils are mostly clay, and they don’t drain as well as sandy soils.  Water was held longer near the surface when it did receive precipitation.  Third, the hilly terrain of the piedmont was a factor in contributing to oases where flora and fauna could flourish.  Rainwater flowed down hills (this is known as colluvial flow), so the bottom areas between them hosted more plant life.  Although most creeks dried up, there were plenty of areas at the bottom of hills where the water table came close enough to the surface to form intermittent springs.  Beavers dammed springs, making them deeper and helping them hold water longer.  Fourth, major rivers didn’t dry out completely and provided plenty of mesic refuge for species that could expand into oases during phases when annual precipitation increased.

Topographical map of the Piedmont National Wildlife Refuge in Jones County, Georgia.  Note the hilly terrain and abundant creeks.  During the LGM colluvial slope flow, intermittent springs, and lower temperatures helped reduce the negative effect of droughts.

My Abundant Oases Hypothesis is speculative.  There are no pollen studies dating to the LGM from piedmont Georgia.  There is 1 site in Winder, Georgia known as Nodoroc where pollen was collected that dates to just before the LGM when temperatures were warmer and precipitation was higher.  Oak and pine were the dominant species, and they co-occurred with hickory, fir, and spruce.  Beech, chestnut, birch, and maple were present.  The shrub layer consisted of hazelnut and blueberry/rhododendron.  There is no sediment dating to between 28,000 years BP-5000 years BP, suggesting land was eroding rather than accumulating sediment during this time period.

This is how I envision the Georgia piedmont landscape during the LGM.  The tops of hills were covered with widely spaced shortleaf pine and post oak.  These were slow growing and ancient because reduced CO2 levels in the atmosphere caused slow plant growth.  Grass, herbs, thorny patches with prickly pear cactus, exposed boulders and rocks, and bare earth occurred between the trees.  Following rare rain events, the ground burst into flower, but most of the year it looked dull and brown.  Deep gullies, red from exposed clay, were common on the hillsides–a result of erosion that commonly occurred due to storms and a lack of topsoil.  The bottoms of hills stayed green longer, and in some low areas hosted springs surrounded by marshy vegetation and deciduous woods of oak, maple, and beech.  These are the oases of my hypothesis.  Megafauna game trails connected these oases with each other, and the river systems where even more deciduous woodlands existed.  This system of oases is what supported the continued existence of species that were able to expand when climatic conditions improved.

Reference:

Soltis, et al.

“Comparative Phylogeography of Unclaciated North America”

Molecular Ecology 2006

 

 

2 New Studies of Pleistocene Lions

January 6, 2019

There were 3 species of lions living on earth during the late Pleistocene.  The African lion (Panthera leo) is the only species still extant.  The cave lion (P. spelaea) ranged across Eurasia from Britain to Beringia which included Alaska and Yukon above the Canadian Ice Sheet.  The giant American lion (P. atrox) lived in North America south of the Ice Sheet from California to Florida.  Some taxonomists formerly thought the 3 lions were the same species, but recent analysis of anatomy and genetics determined they were 3 distinct species.

2 new studies of Pleistocene lions were published last year.  The first study described an unusually large lion skull found in Natodermi, Kenya.  This specimen is estimated to be 196,000 years old. On average cave lions and giant American lions were larger than African lions.  P. atrox was the largest species of lion, averaging 25% larger than African lions, and 1 specimen is estimated to have weighed over 1000 pounds.  (See https://markgelbart.wordpress.com/2017/01/31/panthera-atrox-the-1007-pound-giant-lion/ )   However, the specimen described in this new paper (catalogued as #KNM-ND59673) belonged to an individual that may have been larger than any cave lion specimen ever described and even larger than all but 2 known American lion specimens.  The size comparison estimates in this paper were based on dental dimensions.  The authors of this paper believe this individual was part of an extinct population that grew to a larger size because they hunted an extinct species of large buffalo (Syncerus antiquus).  They think it was a subspecies of African lion related to the ancestors of the 2 regional haplotypes of lion that still occur today.  Genetic evidence suggests northern lions diverged from an ancestral population of lions 147,000 years ago, while southern lions diverged 189,000 years ago.  This specimen was found on the border between the 2 modern haplotypes.  Although they don’t think it was a distinct species, they can’t completely rule it out–there just isn’t enough evidence.  It seems likely some Pleistocene African lions were just as large as the other 2 species.  Lions originally evolved in Africa but fossil evidence from that continent is more rare than in Eurasia and North America.

 

196,000 year old African lion skull.

Image result for syncerus antiquus

Pleistocene lions may have grown larger in Africa to help them bring down this large extinct species of buffalo.

The 2nd study described 4 specimens of cave lion found in Medvedia Cave located in the Zapadne Tatry Mountains.  These mountains border northern Slovakia and southern Poland. Referring to this species as the “cave” lion is misleading.  Most individuals never went inside a cave during their entire life.  A cave environment is just 1 of the rare places where their remains could be preserved.  Medvedia Cave is the highest altitude that a lion fossil has ever been found.  The authors of this paper think lions searched through caves for hibernating bears, and groggy bears may have been an important part of high altitude lions’ diets because other substantial prey was scarce here.  Some scientists think cave lions were solitary hunters or perhaps hunted in pairs, unlike social African lions that live in large prides.  I disagree with this notion.  Adult male lions grow too large and bulky to hunt prey effectively, and they depend upon females to bring them food.

Lions were more widespread during the Pleistocene because human populations were sparse.  Humans have outcompeted lions since then.  If not for the rise of humans, lions would still be just as widespread as they used to be.

Reference:

Manth, F. ; et. al.

“Gigantic Lion, Panthera leo, from the Pleistocene of Natodermi, eastern Africa”

Journal of Paleontology 92 (2) Novemeber 2018

Sabol, Martin; Juraj Gullar and Jan Harrat

“Montane Record of the Late Pleistocene Panthera spelaea (Goldfuss 1810) from Zapadne Tatry Mountains (northern Slovakia)”

Journal of Vertebrate Paleontology  38 (3) 2018

See also: https://markgelbart.wordpress.com/2016/01/07/uf9076-a-complete-skull-and-jaws-of-a-giant-lion-panthera-atrox-found-in-the-ichetucknee-river-florida/