The effect of fires on susceptibility of subalpine forests to a 19th century spruce beetle outbreak in western Colorado

2006 ◽  
Vol 36 (11) ◽  
pp. 2974-2982 ◽  
Author(s):  
Dominik Kulakowski ◽  
Thomas T Veblen
Keyword(s):  
19Th Century ◽  
Fire History ◽  
Abies Lasiocarpa ◽  
Subalpine Forests ◽  
Dendroctonus Rufipennis ◽  
The Past ◽  
Engelmann Spruce ◽  
Spruce Beetle ◽  
History Of ◽  
Colorado Rocky Mountains

In the subalpine forests of the Colorado Rocky Mountains, research on disturbances that have occurred over the past several decades has shown that prior occurrence of disturbances can alter the extent and severity of subsequent disturbances. In the current study, we consider how fire history affected stand susceptibility to a mid-19th century spruce beetle (Dendroctonus rufipennis Kirby 1837) outbreak. Twenty-one sites were randomly located in an Engelmann spruce – subalpine fir (Picea engelmannii Parry ex Engelm. – Abies lasiocarpa (Hook.) Nutt.) forest across ~2000 km2 of the Grand Mesa area, Colorado. At each site, dendrochronological methods were used to reconstruct the history of severe fires and beetle outbreak. Stand-origin dates were estimated by collecting increment cores from 20–27 of the largest trees at each sample site. The beetle outbreak was reconstructed based on coincident releases among nonhost trees that survived the outbreak. Forest stands originated following severe fires in ca. 1790, ca. 1740, and ca. 1700. The 1840's outbreak affected 67% of these stands. Stands that initiated following the ca. 1790 fire were less susceptible to the outbreak than older stands. These findings indicate that stand-replacing fires have mitigated susceptibility to outbreaks of spruce beetles not only during recent outbreaks, but also over the past centuries.

Gariwerd

2020 ◽  
Author(s):  
Benjamin Wilkie
Keyword(s):  
Natural Resources ◽  
Environmental History ◽  
19Th Century ◽  
National Park ◽  
Ecological Significance ◽  
Left Behind ◽  
The Past ◽  
History Of ◽  
Western Victoria ◽  
The 19Th Century

People have been visiting and living in the Victorian Grampians, also known as Gariwerd, for thousands of generations. They have both witnessed and caused vast environmental transformations in and around the ranges. Gariwerd: An Environmental History of the Grampians explores the geological and ecological significance of the mountains and combines research from across disciplines to tell the story of how humans and the environment have interacted, and how the ways people have thought about the environments of the ranges have changed through time. In this new account, historian Benjamin Wilkie examines how Djab wurrung and Jardwadjali people and their ancestors lived in and around the mountains, how they managed the land and natural resources, and what kinds of archaeological evidence they have left behind over the past 20 000 years. He explores the history of European colonisation in the area from the middle of the 19th century and considers the effects of this on both the first people of Gariwerd and the environments of the ranges and their surrounding plains in western Victoria. The book covers the rise of science, industry and tourism in the mountains, and traces the eventual declaration of the Grampians National Park in 1984. Finally, it examines more recent debates about the past, present and future of the park, including over its significant Indigenous history and heritage.

Evaluations of Bole Injections for Protecting Engelmann Spruce from Mortality Attributed to Spruce Beetle (Coleoptera: Curculionidae) in the Intermountain West

2020 ◽  
Vol 55 (3) ◽  
pp. 301-309
Author(s):  
Christopher J. Fettig ◽  
A. Steven Munson ◽  
Donald M. Grosman ◽  
Darren C. Blackford
Keyword(s):  
Bark Beetles ◽  
Tree Mortality ◽  
Crop Protection ◽  
Tree Age ◽  
Picea Engelmannii ◽  
Future Research ◽  
Emamectin Benzoate ◽  
Dendroctonus Rufipennis ◽  
Engelmann Spruce ◽  
Spruce Beetle

Abstract Bark beetles are important disturbance agents in coniferous forests, and spruce beetle, Dendroctonus rufipennis (Kirby) (Coleoptera: Curculionidae), is one of the more notable species causing landscape-level tree mortality in western North America. We evaluated the efficacy of bole injections of emamectin benzoate (TREE-äge®; Arborjet Inc., Woburn, MA) alone and combined with propiconazole (Alamo®; Syngenta Crop Protection Inc., Wilmington, DE) for protecting Engelmann spruce, Picea engelmannii Parry ex Engelmann (Pinales: Pinaceae), from mortality attributed to colonization by D. rufipennis. Two injection periods in 2013 (the spring and fall of the year prior to trees first being challenged by D. rufipennis in 2014) and distributions of injection points (7.6- and 15.2-cm spacings) were evaluated. Tree mortality was monitored over a 3-yr period (2014–2017). Emamectin benzoate injected in spring at a narrow spacing (7.6 cm) was the only effective treatment. Two (but not three) field seasons of protection can be expected with a single injection of this treatment. We discuss the implications of these and other results regarding the use of emamectin benzoate and propiconazole for protecting western conifers from mortality attributed to bark beetles, and provide suggestions for future research. A table summarizing the appropriate timing of treatments in different bark beetle/host systems is provided.

scholarly journals Advances in Semiochemical Repellents to Mitigate Host Mortality From the Spruce Beetle (Coleoptera: Curculionidae)

2019 ◽  
Vol 112 (5) ◽  
pp. 2253-2261 ◽  
Author(s):  
E Matthew Hansen ◽  
A Steven Munson ◽  
David Wakarchuk ◽  
Darren C Blackford ◽  
Andrew D Graves ◽  
...  
Keyword(s):  
Picea Engelmannii ◽  
Individual Tree ◽  
Dendroctonus Rufipennis ◽  
Tree Diameter ◽  
Degree Of Protection ◽  
Southern Rocky Mountains ◽  
Single Tree ◽  
Engelmann Spruce ◽  
Tree Protection ◽  
Spruce Beetle

AbstractWe tested 3-methyl-2-cyclohexen-1-one (MCH) and novel semiochemicals as potential spruce beetle (Dendroctonus rufipennis Kirby) (Coleoptera: Curculionidae, Scolytinae) repellents over multiple years in Utah and Colorado trapping bioassays. MCH is a known spruce beetle repellent and our testing revealed Acer kairomone blend (AKB) and isophorone plus sulcatone as repellents. We subsequently tested these semiochemicals for area and single tree protection to prevent spruce beetle attacks at locations in Utah, Colorado, Wyoming, New Mexico, and Alaska. Individual tree protection trials found MCH–AKB provided significant protection against spruce beetle attacks in the southern Rocky Mountains but not in Alaska. Adding sulcatone or doubling MCH–AKB pouches did not further enhance protection. A degree of protection was extended to spruce at least 10 m distant from the repellents, including in Alaska. Tree diameter was not a significant covariate among treated trees but was positively correlated with the probability of infestation for surrounding spruce. In area protection trials, spruce in control plots were 2.4 times more likely to be in a higher severity attack class compared with spruce in plots treated with MCH–AKB pouches deployed at 30 sets per hectare. Tree diameter had a significant, positive relationship to the probability of infestation. We found MCH–AKB to offer a high degree of protection against beetle attack in Engelmann spruce (Picea engelmannii Parry ex Engelm.) (Pinales: Pinaceae) (Picea engelmannii Parry ex Engelm.) (Pinales: Pinaceae), especially for single tree protection (66% of control trees were strip- or mass-attacked compared with 6% of repellent-treated trees). AKB requires registration and labeling, however, before this economical and environmentally benign semiochemical can be used operationally.

scholarly journals Polsko-litewskie dziedzictwo kulturowe – różnice w świadomości społecznej. Perspektywy zbliżenia dzięki wspólnym bohaterom narodowym na przykładzie Michała Kleofasa Ogińskiego

2021 ◽  
pp. 231-261
Author(s):  
Małgorzata Gumper
Keyword(s):  
National Identity ◽  
19Th Century ◽  
The Past ◽  
The Future ◽  
Political Activist ◽  
History Of ◽  
Historical Education ◽  
National Hero ◽  
The 19Th Century

The uncomfortable situation of Poles in Lithuania is, among other things, the effect of Lithuanian historical education. Excerpts from the textbook on the history of Lithuania show diametrical differences in contemporary ideas about the past of both nations. Shared heroes are useful to overcome prejudices of the previous century (which affect the image of 1385-1795). One of them is Michał Kleofas Ogiński, Lithuanian nobleman, a political activist during the last years of the Polish-Lithuanian Commonwealth and two decades after its collapse. He has the rank of a great national hero in Lithuania and Belarus but is valued in Poland above all because of his piano compositions. The analysis of fragments of his work Memoirs about Poland and Poles helps us to regard a representative of the noble nation from a different perspective. It makes us aware of the cohesion of Polish and Lithuanian national identity at the turn of the 19th century, helps us to appreciate the heritage of the past and offers a chance to build positive relations between us. Rectifying a distorted vision of history is a prospect for a mature partnership now and in the future.

scholarly journals O gnaisse facoidal: a mais carioca das rochas

2008 ◽  
Vol 31 (2) ◽  
pp. 9-22
Author(s):  
Kátia Leite Mansur ◽  
Ismar Souza Carvalho ◽  
Carlos Fernando Moura Delphim ◽  
Emilio Velloso Barroso
Keyword(s):  
19Th Century ◽  
Extraction Method ◽  
Historical Buildings ◽  
Slave Labor ◽  
The Past ◽  
African People ◽  
History Of ◽  
Augen Gneiss ◽  
The 19Th Century ◽  
The City

The city of Rio de Janeiro is known by its natural beauties. The mountains and the sea make the city the postcard of Brazil. The sculpture of the carioca landscape is closely related to the augen gneiss, very resistant rock to the weathering and, for this reason, it stands out in the relief. It gives form for Sugar Loaf and Corcovado, for example. Augen gneiss was used in the construction of most of the historical buildings of the city, including museums and churches, many of them were built in the 19th century. It was used in the sculpture of ornaments, facades and frames of doors and windows. The exploitation of the augen gneiss was presented by Jean Baptiste Debret in his book "Voyage Pittoresque et Historique au Brésil". A picture of quarry is presented at Morro da Glória and describes the extraction method by slave labor. He informes that the augen gneiss is softer, less expensive and more easily exploited. It was destined, mainly, to the parts of the buildings that should be sculpted. This rock is still present in an important event of the history of the brazilian arts. Pedra do Sal, a stairway sculpted in the augen gneiss Downtown, was the place that African people met in the past to tell their histories, to do religious cults and to sing. In these meetings in Pedra do Sal samba was born

POSIDONIAN THOUGHTS—ANCIENT AND MODERN

2004 ◽  
Vol 35 (3) ◽  
pp. 284-294
Author(s):  
René Bloch
Keyword(s):  
19Th Century ◽  
Golden Age ◽  
The Past ◽  
History Of ◽  
The 19Th Century ◽  
Jewish Religion

AbstractStrabo's history of Judaism (Geography 16.2.35ff.), which is most probably copied from Posidonius, focuses less on the past which is idealized than on the present which is criticized—as is common in descriptions of a "golden age" which later deteriorates. The Posidonian thought that the Jewish religion declined made its way into Tacitus' mostly hostile ethnography of Judaism. Modern scholars, especially in the 19th century, when commenting on Posidonius and Tacitus sympathized from a quite different perspective with that very idea of a Jewish decline.

The History of Psychiatry

1978 ◽  
Vol 133 (2) ◽  
pp. 182-183
Author(s):  
J. L. T. Birley
Keyword(s):  
19Th Century ◽  
History Of Psychiatry ◽  
The Past ◽  
History Of ◽  
Deja Vu ◽  
Déjà Vu ◽  
Old Men ◽  
The 19Th Century ◽  
Old Friends

I am not a historian, a mere dabbler in history, but the figures of the past have always intrigued me. Psychiatry lives in the shadow of the 19th century, both in terms of its architecture and of its theories. It is not too difficult to give oneself déjà vu feelings about psychiatry, and to see its ‘progress' as a circular tour. But what of it ? In that way we revisit all sorts of old friends, provided we meet them as they really were, and not as dusty images, mouldering statues, ancient deities or foolish fond old men.

Suppression of Spruce Beetle Attacks by MCH Released from Bubble Caps

1989 ◽  
Vol 4 (2) ◽  
pp. 49-52 ◽  
Author(s):  
B. Staffan Lindgren ◽  
Mark D. McGregor ◽  
Robert D. Oakes ◽  
Hubert E. Meyer
Keyword(s):  
Early Stage ◽  
Mass Trapping ◽  
Brood Production ◽  
Dendroctonus Rufipennis ◽  
Suppression Effect ◽  
Engelmann Spruce ◽  
Stage Of Development ◽  
Baited Traps ◽  
Spruce Beetle ◽  
Release Devices

Abstract The attack density of the spruce beetle, Dendroctonus rufipennis (Kirby), was reduced to 10-25% of that on untreated felled Engelmann spruce (Picea engelmannii) trees, when the trees were treated with 9-15 bubble cap release devices, each releasing the aggregation inhibitor MCH at 1-3 mg/24 h at 20°C. In the first experiment, deterioration of many release devices reduced the suppression effect. In the second experiment, MCH reduced attacks by 85%, and total brood production by 79-88%. The attacks on the MCH treated trees occurred late, as evidenced by the early stage of development of galleries and brood on these trees. Semiochemical-baited traps at untreated, or MCH-treated, felled trees caught few beetles, and had no effect on the attack density. The results show that manually applied MCH can be used operationally to reduce attacks by the spruce beetle on small groups of wind thrown trees. Mass trapping of spruce beetles is not feasible with currently known semiochemicals. West. J. Appl. For. 4(2):49-52, April 1989.

Toxicity of two Engelmann spruce (Pinaceae) monoterpene chemotypes from the southern Rocky Mountains to North American spruce beetle (Coleoptera: Scolytidae)

2020 ◽  
Vol 152 (6) ◽  
pp. 790-796
Author(s):  
Thomas Seth Davis
Keyword(s):  
Rocky Mountains ◽  
Picea Engelmannii ◽  
Dendroctonus Rufipennis ◽  
Probability Of Survival ◽  
Southern Rocky Mountains ◽  
Engelmann Spruce ◽  
Adult Body Mass ◽  
Spruce Beetle ◽  
Average Probability ◽  
Logit Function

AbstractEngelmann spruce, Picea engelmannii Parry ex Engelm. (Pinaceae), in the southern Rocky Mountains is composed of two distinct phloem monoterpene chemotypes that differ in relative abundances of multiple monoterpenes, particularly α-pinene and Δ3-carene (hereafter, the “α-pinene chemotype” and the “Δ3-carene chemotype”). Here, relative toxicity of these chemotypes is tested on spruce beetle (Dendroctonus rufipennis Kirby) (Coleoptera: Scolytinae), a phloeophagous herbivore that colonises trees of both types. Synthetic monoterpene blends representing each chemotype were tested across a range of concentrations (0, 10, 50, 100, 200, and 500 µg/L) in the lab, and probability of survival of adult beetles exposed to each blend was modelled using a logit function. Logit curves were solved to determine LC25, LC50, and LC75 of each monoterpene blend. On average, probability of beetle survival was lower when exposed to the Δ3-carene chemotype than when exposed to the α-pinene chemotype. However, both chemotypes were completely lethal to beetles at concentrations exceeding 100 µg/L. Adult body mass did not affect survival probability. It is concluded that spruce phloem chemotypes may differ in their toxicity to spruce beetles, with potential consequences for patterns of host-tree colonisation by spruce beetle.

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