Part II: Life Explosions
© Wikimedia Common
Fossil of Trilobite Walliserops trifurcatus
Chapter 4: Peculiar Life-Forms around Cometary Impacts
Logically one considers cometary event as solely agents of mass destruction as exemplified by the numerous mass extinctions or the induced catastrophes like volcanism or seismicity described in the first part. But while writing “Cometary Encounter”, I stumbled upon some peculiarities relating to the Tunguska event
[1] and its effects on local life forms:
It was found that the genotypic dispersion has sharply increased in the
Tunguska trees. The effect is prominent, has a patchy character and concentrates toward the epicenter area, as well as toward of the TSB [
Tunguska Space Body] trajectory projection (Vasilyev 1999, 2000, 1998). At maximums the genotypic dispersion shows about 12-fold increment (Vasilyev 2000). One of the maximums coincides again with the Mount Chirvinskii, another - with the calculated center of the light flash.
[2]
The term “genotypic dispersion” used above refers to an increase in genetic mutations. Mutations, especially detrimental ones, are compatible with cometary encounters being exclusively agents of destruction since radioactive fallouts and ionizing radiations
[3] are known to damage genetic material
[4] and occurred during the Tunguska explosion
[5]. But Tunguska trees revealed another feature that is even more peculiar:
The cause of the
anomalous growth of tree rings after 1909 is more controversial. We collected tree ring data for 9 spruces, 1 larch and 1 Siberian pine. A comparison of the average tree ring width over about 30 years before 1907 and exactly the same period after 1909 has confirmed the width increase for all the 11 trees examined.
From these data no correlation with the tree position has been found. The trees were divided into two groups: 5 trees with an average ring width before 1907 equal to about 0.4 mm and a second group with a ring width of about 1 mm.
After 1909 both groups reach approximately the same ring width of about 1.2-1.5 mm with an increase for the first group by a factor 3-4, as against a factor 1.2-1.5 for the second group.[6]
Notice that this growth spur affected both new trees, young trees and old trees. This accelerated growth only weakened in the 1990s
[7]. A sustained and accelerated growth doesn’t sound like a random mutation, which is in more than 99.99%
[8] of the cases detrimental or neutral. It sounds rather like a beneficial one.
Could cometary events, beside their obvious destructive effects, somehow improve life forms?
© Vitaly Romeyko
Cross section of a Tunguska tree. The black arrow shows the year 1908.
The rings after the event markedly wider
Another puzzling feature revealed by the Tunguska trees is that the area of maximum growth is away from the epicenter:
[Trees growth] extrapolated maximum is expected far away from the epicenter, at some 20-25 km distance (Emelyanov et al. 1979, Vasilyev 1999). One has an impression that the flight of the TSB was accompanied by some unknown agent capable to induce remote ecological and maybe even genetic changes.
[9]
Along trees, insects in
Tunguska were also affected by the overhead explosion:
[…] geneticists V. K. Dmitrienko and 0 . P. Fedorova found that the insects living near Ostraya Mountain and at Churgim Creek did sharply differ from those caught in other places. In other words, these differences were greatest where peaks of mutations in local pines were also greatest. This seems to be significant. It would therefore seem that the ancestors of these ants did also undergo mutations at the Tunguska catastrophe of 1908
[10]
In addition to be the place of unexpected occurrence of beneficial mutations,
Tunguska, although it’s a very common biotope (taiga forest) which is not isolated whatsoever by surrounding seas, deserts or mountains, is the location of a few plants that are found nowhere else in the world:
Most endemics are protected only in a few nature reserves around the globe -
because these species simply do not exist elsewhere. Examples of this group of plants include the Catang's Oxytrope, found only in Central Siberia, and Iris of Bludov [Iris bloudowii}], found only in southern Siberia - the Tunguska Reserve is located at the northernmost limit of the distribution range of this species. Both of these species are included in the Red Books of the Krasnoyarsk Territory.
However, the most interesting endemic found here in the Tunguska Nature Reserve is Astragalus of Shumilov [Astragalus schumilovae].
This plant can survive in only one place on the entire globe - in southern Evenkia, between the rivers Podkamennaya Tunguska and Chunya. Thus, the only reserve in the world that protects this fantastically rare species is the Tunguska Nature Reserve.
[11]
Even Humans in the vicinity of
Tunguska also experienced
non-detrimental and extremely rare mutations:
Rychkov discovered an Evenk woman lacking the Rh-D antigen. Genetic examinations of her family enabled to conclude that a very rare mutation of the Rh-D gene happened in 1912. This mutation may have affected the women’s parents, who in 1908 lived at some 100 km distance from the epicenter and were eyewitnesses of the Tunguska explosion. The women remembered her parents’ impressions of the event: a very bright flash, a clap of thunder, a droning sound, and a burning wind (Rychkov 2000).
[12]
Notice that the woman in question was from the
Evenk, an indigenous people of Russia where more than 99% of the population has a positive rhesus
[13].
Now, is Tunguska an isolated oddity or can we find other examples of new life forms spawning from documented cometary impact? To answer this question, let’s have a look at the most recent major cometary bombardment, the one that started the
Younger Dryas ca. 12,900 BP.
The
Carolina Bays are the ejecta impact sites of the primary cometary impact in Lake Michigan
[14], they tell a fascinating story that is surprisingly similar to
Tunguska:
Much to everyone's amazement, Venus' flytraps are not some strange, exotic plant. It is native only to the Carolinas, and, according to Wikipedia, probably within a 60-mile radius of Wilmington, North Carolina.
They are found mostly around crater-like formations known as Carolina Bays, which are located mostly in the same area. Connections to these bays, which are thought to be caused by
meteors, only help theories of their alien origins.
[15]
While there are about 180 species
[16] of carnivorous plant belonging to the
Droseraceae family,
Venus’ flytraps (
Dionaea muscipula) are the only specie representative of the genus
Dionaea.
The closest relative
[17] of the
Venus flytrap is a water plant called waterwheel (
Aldrovanda vesiculosa), which is the only plant sharing the same snap trap mechanism
[18].
Despite sharing a similar snap trap mechanism, the Venus flytrap and the waterwheel are genetically extremely different:
The genome size of both cultured and wild Dionaea muscipula is 3.18 Gbp
[19] and thus comparable in size with the human genome. In contrast, the genome sizes obtained for Aldrovanda vesiculosa are 509 Mbp
[20]
As you can see in the picture below, there are indeed more than a few “random” mutations between the two alleged cousins:
© Palfalvi
A (left): Water plant waterwheel (Aldrovanda vesiculosa)
B (right): Ground plant Venus flytrap (Dionaea Muscipula)
Given the sudden and localized apparition of
Venus flytrap out of thin air, it’s not surprising that
Charles Darwin euphemistically coined the
Venus flytrap as “one of the most wonderful [plant] in the world”
[21]. He was certainly smart enough not to mention the serious challenges that
Venus’ flytraps posed to his claims bout incremental minute evolution caused by random mutations.
Actually, the
Venus’ flytraps are only one example of species that are exclusively endemic to the
Carolina Bays:
Although most Carolina bays are much smaller, Lake Waccamaw in North Carolina stretches across 9,000 acres with 14 miles of shoreline at the headwaters of the Waccamaw River. It is home to native fish and plants that can only be found in or around the lake.
[22]
Naturalist
Janna Sasser provides more details about the endemic, rare or endangered species of plants and animals found in the
Carolina Bays:
For Terri Kirby Hathaway, North Carolina Sea Grant’s marine education specialist, the bays’ value as a habitat for many of the state’s rare plant and animal species is clear. [...] While other natural landscapes of the Americas were being named and noted, these low wetlands — unique reservoirs housing a wealth of beautiful and unfamiliar plant and animal species — remained inconspicuous. [...] Yet, she points out that unaltered bays function as wildlife habitat for several endangered animals and rare plants, and support an array of unique communities of species. [...]
Along with five species on the state’s rare plant list —
the Venus-hair fern, green-fly orchid, seven-angled pipewort, narrowleaf yellow pondlily and water arrowhead — Hall notes seven animal species endemic to Lake Waccamaw. [...]
As of 2004, seven rare animals and 10 rare plants were documented residing in the bay, including one Federally Endangered species and two Federal Species of Concern.
[23]
The
Carolina bays host a number a fauna and flora species found nowhere on our planet. This peculiarity begs an obvious question: “
did the cometary ejecta that formed the Carolina Bays contribute to the apparition of new and endemic species?”
[1] Overhead cometary explosion above Tunguska, Russia in 1908.
[2] Vasilyev, N. V. (1999). “Ecological consequences of the Tunguska catastrophe”, in Problemi radioekologii i pogranichnikh discipline, 89
[3] Cravens, T., et al. (1987) “Electron impact ionization in the vicinity of comets”. Journal of Geophysical Research 92, 7341–7353
[4] National Research Council (US) Committee on the Biological Effects of Ionizing Radiation. (1990). “Health Effects of Exposure to Low Levels of Ionizing Radiation”. National Academies Press
[5] Rubtsov, V. (2012) “Reconstruction of the Tunguska Event of 1908: Neither an Asteroid, Nor a Comet Core”. arXiv:1302.6273
[6] See: Longo, G. et al. (1994) “Search for microremnants of the Tunguska cosmic body”. Planetary and Space Science. n. 2, 163--177
Serra, R. et al. (1994) “Experimental hints on the fragmentation of the Tunguska cosmic body”. Planetary and Space Science, n. 9, 777--783
[7] Longo, G., et al. (1995) “Some Answers From Tunguska Mute Witnesses“ in Meteorite!, 1 (4), 12
[8] Jesse D. Bloom, Frances H. Arnold. (2009) “In the light of directed evolution: Pathways of adaptive protein evolution”. Proceedings of the National Academy of Sciences 106 (Supplement 1) 9995-10000
[9] Zurab K. Silagadze (2003) “Tunguska genetic anomaly and electrophonic meteors”. Acta Phys.Polon. B 36 935
[10] Rubtsov, Vladimir. (2009) “The Tunguska Mystery”. Springer Science & Business Media
[11] Wildnet Editors. (2020) “Rare plants”. Wildnet.ru (translated from Russian)
[12] Zurab K. Silagadze (2003) “Tunguska genetic anomaly and electrophonic meteors”. Acta Phys.Polon. B 36 935
[13] Gafarov NI, et al. (1998) “Genetic characteristics of the population of Severo-Baĭkal'skiĭ region of the northern part of the Buryat Republic”. Genetika;34(7):979-84
[14] Lescaudron, Pierre. (2021) “Cometary Encounters”. Red Pill Press. Chapter “Atmospheric ablation induced by a cometary impact”
[15] Everything is electric Editors (2015). "Flytraps are Venus’?”. Everythingiselectric.com
[16] Christenhusz, M. et al. (2016) "The number of known plants species in the world and its annual increase". Phytotaxa. Magnolia Press. 261 (3): 201–217
[17] Gibson, T. et al. (2009) "Evolving Darwin's 'most wonderful' plant: ecological steps to a snap-trap". New Phytologist. 183 (3): 575–587
[18] Cameron, K. et al. (2002) "Molecular evidence for the common origin of snap-traps among carnivorous plants". American Journal of Botany. 89 (9): 1503–1509
[19] Gbp stands for Giga base pair, referring to the pairs of bases (nucleotides: A,T,G,C) that constitute DNA.
[20] Palfalvi et al. (2020) “Genomes of the Venus Flytrap and Close Relatives Unveil the Roots of Plant Carnivory” Curr Biol. 22;30(12):2312-2320
[21] Darwin, C. (1875), “Insectivorous Plants”, John Murray
[22] American Rivers Editors (2020). “What are Carolina Bays”. American Rivers
[23] Sasser, Janna. (2015) “Naturalist’s notebook: Carolina Bays: Another Man’s Treasure”. North Carolina State University