Populations Dynamics and Role of Two Species of Lepidostoma (Trichoptera: Lepidostomatidae) In an Oregon Coniferous Forest Stream

Ecology ◽  
1980 ◽  
Vol 61 (4) ◽  
pp. 808-816 ◽  
Author(s):  
E. Grafius ◽  
N. H. Anderson
Keyword(s):  
Coniferous Forest ◽  
Forest Stream ◽  
Populations Dynamics

The role of terrain in a fire mosaic of a temperate coniferous forest

1997 ◽  
Vol 95 (2) ◽  
pp. 97-107 ◽  
Author(s):  
John D. Kushla ◽  
William J. Ripple
Keyword(s):  
Coniferous Forest

scholarly journals The role of managed coniferous forest in the conservation of reptiles

2016 ◽  
Vol 362 ◽  
pp. 69-78 ◽  
Author(s):  
Gabriela M. Jofré ◽  
Mark R. Warn ◽  
Christopher J. Reading
Keyword(s):  
Coniferous Forest

The role of litterfall in transferring Fukushima-derived radiocesium to a coniferous forest floor

2014 ◽  
Vol 490 ◽  
pp. 435-439 ◽  
Author(s):  
Mengistu T. Teramage ◽  
Yuichi Onda ◽  
Hiroaki Kato ◽  
Takashi Gomi
Keyword(s):  
Forest Floor ◽  
Coniferous Forest

Further observations on the food and predatory habits of the gray jay

1970 ◽  
Vol 48 (2) ◽  
pp. 327-330 ◽  
Author(s):  
Henri Ouellet
Keyword(s):  
Small Mammals ◽  
Coniferous Forest ◽  
Dried Fruits ◽  
Perisoreus Canadensis ◽  
Important Predator

The gray jay (Perisoreus canadensis) has been observed feeding on a variety of items ranging from several types of animal carcasses to axle grease and dried fruits. Other observations pertain to its predation on nests and young of several species of birds and on certain small mammals in the coniferous forest. It is suggested that this bird may be an important predator and scavenger, the rôle of which is still mostly undetermined.

The Role of Aquatic Invertebrates in Processing of Wood Debris in Coniferous Forest Streams

1978 ◽  
Vol 100 (1) ◽  
pp. 64 ◽  
Author(s):  
N. H. Anderson ◽  
J. R. Sedell ◽  
L. M. Roberts ◽  
F. J. Triska
Keyword(s):  
Aquatic Invertebrates ◽  
Coniferous Forest ◽  
Wood Debris ◽  
Forest Streams

Microfungi associated with Abies needles and Betula leaf litter in a subalpine coniferous forest

2007 ◽  
Vol 53 (1) ◽  
pp. 1-7 ◽  
Author(s):  
Takashi Osono ◽  
Hiroshi Takeda
Keyword(s):  
Leaf Litter ◽  
Trichoderma Viride ◽  
Coniferous Forest ◽  
Subalpine Forest ◽  
Decomposition Processes ◽  
Volutella Ciliata ◽  
High Degree ◽  
The Impact ◽  
Degree Of Similarity

We investigated microfungal assemblages on leaf litter within a subalpine forest in central Japan and their variation with season, litter depth, and litter species. Microfungal assemblages were compared for Abies needles and Betula leaf litter collected from litter and fermentation layers of the forest floor during the growing season in spring, summer, and autumn. A total of 35 and 42 species were isolated from Abies needles and Betula leaf litter, respectively. The observed variation in microfungal assemblages was primarily attributable to seasonal differences. The frequencies of Trichoderma viride, Volutella ciliata, Mucor sp., and Umbelopsis ramanniana increased in summer, leading to a high degree of similarity of microfungal assemblages in different litter depths and litter species. Microfungal assemblages on Abies needles in spring and autumn and those on Betula leaves in spring were characterized by Trichoderma viride, V. ciliata, Thysanophora penicillioides, Trichoderma polysporum, and (or) Mortierella alpina. Microfungal assemblages on Betula leaves in autumn were characterized by the absence of these species and the occurrence of Cladosporium cladosporioides. The results were discussed with an emphasis on the role of microfungi in decomposition processes and the impact on fungi of predicted future increases in global temperature.Key words: birch, decomposition, diversity, fir, global warming.

Microplastics occurrence in an urban space - Coimbra city case-study

2021 ◽  
Author(s):  
Inês Amorim Leitão ◽  
Loes van Schaik ◽  
António Dinis Ferreira ◽  
Violette Geissen
Keyword(s):  
Urban Space ◽  
Coniferous Forest ◽  
Mixed Forest ◽  
Progressive Increase ◽  
Point Sources ◽  
Area Index ◽  
Forest Stream ◽  
Green Areas ◽  
Natural Grassland

<p>The progressive increase of population living in cities led to the aggravation of the pollution problem worldwide, especially in urban environments. Air, water and soil are compartments affected by this reality, and the pollution leads to human health problems. There are many different point and non-point sources of emerging pollutants such as microplastics, which are transported diffusely through wind and rain. Therefore, it is very complex to quantify, control and treat these pollutants, designated current problematic issues by the European Commission. Green areas are pointed out by experts as natural filters for contaminants in cities, through their capacity of retention by leaves and soil.</p><p>This study investigates the contamination of microplastics in urban green areas soils, as well as the possible sources of microplastics, with a case-study in Coimbra (Portugal). Nine samples of fifty grams of soil were taken: three from a mixed broad-leaved with coniferous forest; three from a green park; three from a natural grassland. Six samples of three litres of water were taken from: rainwater (wet and dry deposition); runoff; freshwater; stream near the mixed forest; stream near the green park; stream near the natural grassland. All the samples were analysed in the laboratory through the extraction of microplastics using the flotation and filtration methods, and the visualization and identification of the particles with a microscope.</p><p>Microplastic particles were found in all samples. The number of microplastics found in soil samples varies between 2200 p kg<sup>-1</sup> and 190400 p kg<sup>-1</sup>, both values obtained in a green urban park. Different levels of microplastics were found in the soil of the three sampled spaces with just a few meters of distance. Most of the particles (80%-98%) have less than half a millimetre. The water samples contained a lower number of microplastic particles. The values ranged from 27 p l<sup>-1</sup> in a peak flow stream near the natural grassland and 7 p l<sup>-1</sup> in freshwater from the tap. In rainwater were found 15 p l<sup>-1</sup> and in runoff 17 p l<sup>-1</sup> particles. Almost all microplastics particles (97%-100%) from water have less than half a millimetre.</p><p>Characteristics such as leaf area index, road proximity and intense precipitation episodes could influence the quantity of microplastics in the soil of green areas and in the streams and runoff. In order to control the entry and the concentration of microplastics in the environment and treat polluted areas, especially in cities, it is essential to quantify the microplastics particles considering the sources, pathways and the local characteristics of vegetation and soils.</p>

scholarly journals Proteo-Transcriptomic Characterization of Sirex nitobei (Hymenoptera: Siricidae) Venom

Toxins ◽  
2021 ◽  
Vol 13 (8) ◽  
pp. 562
Author(s):  
Chenglong Gao ◽  
Lili Ren ◽  
Ming Wang ◽  
Zhengtong Wang ◽  
Ningning Fu ◽  
...  
Keyword(s):  
Coniferous Forest ◽  
Venom Gland ◽  
Crude Venom ◽  
Symbiotic Fungus ◽  
Host Trees ◽  
Liquid Chromatography Tandem Mass ◽  
Venom Glands ◽  
Encoding Protein ◽  
First Time

The wood-boring woodwasp Sirex nitobei is a native pest in Asia, infecting and weakening the host trees in numerous ecological and commercial coniferous forest plantations. In China, hosts of S. nitobei are diverse, so the pest has spread to several provinces of China, resulting in considerable economic and ecological damage. During female oviposition, S. nitobei venom along with arthrospores of the symbiotic fungus Amylostereum areolatum or A. chaetica is injected into host trees, and the combination of these two biological factors causes the death of xylem host trees. The presence of venom alone causes only the yellowing and wilting of needles. In this study, we constructed the venom gland transcriptome of S. nitobei for the first time and a total of 15,036 unigenes were acquired. From the unigenes, 11,560 ORFs were identified and 537 encoding protein sequences with signal peptides at the N-terminus. Then, we used the venomics approach to characterize the venom composition of female S. nitobei and predicted 1095 proteins by liquid chromatography-tandem mass spectrometry (LC-MS/MS) analysis. We focused on seven proteins that were both highly expressed in the venom gland transcriptome and predicted in the crude venom proteome. These seven proteins are laccase-2, laccase-3, a protein belonging to the Kazal family, chitooligosaccharidolytic β-N-acetylglucosaminidase, beta-galactosidase, icarapin-like protein, and waprin-Thr1-like protein. Using quantitative real-time PCR (qRT-PCR), we also proved that the genes related to these seven proteins are specifically expressed in the venom glands. Finally, we revealed the functional role of S. nitobei venom in the physiological response of host trees. It can not only promote the colonization of symbiotic fungus but contribute to the development of eggs and larvae. This study provides a deeper understanding of the molecular mechanism of the woodwasp–pine interaction.

Role of Southern Pine Beetle 1 and Fire in Maintenance of Structure and Function of the Southeastern Coniferous Forest 2

1981 ◽  
Vol 10 (6) ◽  
pp. 821-825 ◽  
Author(s):  
T. D. Schowalter ◽  
R. N. Coulson ◽  
D. A. Crossley
Keyword(s):  
Coniferous Forest ◽  
Structure And Function ◽  
Southern Pine Beetle ◽  
Southern Pine ◽  
Pine Beetle ◽  
And Function

The role of fire as a mineralizing agent in a Sierran coniferous forest

Oecologia ◽  
1976 ◽  
Vol 25 (1) ◽  
pp. 35-45 ◽  
Author(s):  
Theodore V. St. John ◽  
Philip W. Rundel
Keyword(s):  
Coniferous Forest
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