scholarly journals New data on species diversity of Annelida (Oligochaeta, Hirudinea) in the Kharbey lakes system, Bolshezemelskaya tundra (Russia)

ZooKeys ◽  
2020 ◽  
Vol 910 ◽  
pp. 43-78
Author(s):  
Maria A. Baturina ◽  
Irina A. Kaygorodova ◽  
Olga A. Loskutova
Keyword(s):  
Species Diversity ◽  
Geographical Distribution ◽  
Benthic Invertebrates ◽  
Current Data ◽  
Lake Ecosystem ◽  
Tundra Zone ◽  
Significant Component ◽  
Lake Ecosystems ◽  
The Third ◽  
Freshwater Bodies

One of the features of the tundra zone is the diversity of freshwater bodies, where, among benthic invertebrates, representatives of Annelida are the most significant component in terms of ecological and species diversity. The oligochaete and leech faunas have previously been studied in two of the three largest lake ecosystems of the Bolshezemelskaya tundra (the Vashutkiny Lakes system, Lake Ambarty and some other lakes in the Korotaikha River basin). This article provides current data on annelid fauna from the third lake ecosystem in the region, Kharbey Lakes and adjacent water bodies. The annelid fauna includes 68 species, including 51 oligochaete species, and 17 species of leeches. For each species, we give information on currently recognised classification, taxonomic synonymy, geographical distribution, findings of the species within the Russian tundra, and brief ecological characteristics.

Species Diversity and Eco-geographical Distribution of Dinoflagellate Cysts in the Bohai Sea, China

2012 ◽  
Vol 47 (2) ◽  
pp. 125-132 ◽  
Author(s):  
Wang Yan ◽  
Huang Lin ◽  
Gu Haifeng ◽  
Li Shuang ◽  
Li Shaoshan
Keyword(s):  
Species Diversity ◽  
Geographical Distribution ◽  
Bohai Sea ◽  
Dinoflagellate Cysts ◽  
The Bohai Sea

The Persian Empire

2018 ◽  
Author(s):  
David M. Lewis
Keyword(s):  
Significant Component ◽  
Persian Empire ◽  
The Third

This chapter explores the role of slavery in several regions of the Persian Empire. The first section looks at elite estates in Anatolia, in particular examining the estate of Asidates discussed in Xenophon’s Anabasis (7.8.7–22), and shows that slave labour likely played a prominent role in their cultivation. The second section examines the role of slavery in the estates in Egypt of the Persian satrap Aršama, which presents a similar picture. The third section analyses the so-called ‘royal economy’ of Fars, known from the Persepolis Fortification Archive, and argues that a significant component of the kurtaš workforce was constituted by enslaved war captives and their descendants.

scholarly journals Acceleration, Deceleration and Dynamic Stress Load in Elite Hurling: A Between-Quarter and Between-Position Comparison

Sports ◽  
2021 ◽  
Vol 9 (1) ◽  
pp. 10
Author(s):  
Damien Young ◽  
Giuseppe Coratella
Keyword(s):  
Dynamic Stress ◽  
Current Data ◽  
Running Performance ◽  
The Third ◽  
Stress Load ◽  
Record Data

This study described the decrement in accelerations, decelerations and dynamic stress load (DSL) between quarters in elite hurling. GPS (10-Hz) were used to record data from 42 players over 22 games (2018–2020 season). The number of accelerations and decelerations and DSL between quarters were assessed. Accelerations and decelerations were greater in Q1 than Q2 (ES = 0.28 and ES = 0.44, respectively), and Q4 (ES = 0.57 and ES = 0.60, respectively), and in Q3 compared to Q4 (ES = 0.50 and ES = 0.44, respectively). The DSL was 56 ± 21 AU in Q1, 56 ± 20 AU in Q2, 52 ± 20 AU in Q3 and 56 ± 24 AU in Q4. There was a decrease in DSL in Q3 compared to Q1 (ES = −0.20) and Q2 (ES = −0.20). Each position experienced a temporal decrease in at least one quarter (ES = 0.43–1.46) in all metrics except full-backs’, half-backs’ and full forwards’ accelerations, midfielders’ decelerations and midfielders’ and half forwards’ DSL. Current data show temporal decrements in running performance in Q2 and Q4 and DSL in Q3. Players should be conditioned to minimize the drop-off in running performances following the third quarter.

scholarly journals Application of the Conditional Nonlinear Optimal Perturbations Method in the Shallow Lake Ecological Degradation and Restoration

2015 ◽  
Vol 2015 ◽  
pp. 1-10 ◽  
Author(s):  
Bo Wang ◽  
Qianqian Qi
Keyword(s):  
Shallow Lake ◽  
Sediment Resuspension ◽  
Finite Amplitude ◽  
Water Transparency ◽  
Lake Ecosystem ◽  
Lake Ecosystems ◽  
Ecological Degradation ◽  
Parameter Condition ◽  
Restoration Model ◽  
Simple Combination

In the shallow lake ecosystems, the recovery of the aquatic macrophytes and the increase in the water transparency have been the main contents of the ecological restoration. Using the shallow lake ecological degradation and restoration model, CNOP method is adopted to discuss the instability and sensitivity of the ecosystem to the finite-amplitude perturbations related to the initial condition and the parameter condition. Results show that the linearly stable clear (turbid) water states can be nonlinearly unstable with the finite-amplitude perturbations, which represent the nature factors and the human activities such as the excessive harvest of the macrophytes and the sediment resuspension caused by artificially dynamic actions on the ecosystems. The results also support the viewpoint of Scheffer et al., whose emphasis is that the facilitation interactions between the submerged macrophytes and the water transparency are the main trigger for an occasional shift from a turbid to a clear state. Also, by the comparison with CNOP-I, CNOP-P, CNOP, and (CNOP-I, CNOP-P), results demonstrate that CNOP, which is not a simple combination of CNOP-I and CNOP-P, could induce the shallow lake ecosystem larger departure from the same ground state rather than CNOP-I, CNOP-P, and (CNOP-I, CNOP-P).

Concentration and Dynamics of the Brazilian Agriculture

2011 ◽  
pp. 6-29
Author(s):  
Fernando Garagorry ◽  
Homero Filho
Keyword(s):  
Geographical Distribution ◽  
Latin American ◽  
Distance Measures ◽  
Agricultural Activity ◽  
Total Production ◽  
Substantial Portion ◽  
Spatial Concentration ◽  
Mathematical Concepts ◽  
The Third ◽  
Latin American Countries

This chapter examines the measurement of motion in agriculture. Not only in Brazil, but in several Latin-American countries, important changes have been observed in the geographical distribution of the agricultural activity. They may take different forms, such as occupation of new areas or reallocation of particular products to areas that were already under some form of agriculture. Besides, in any year, for a given level of geographical subdivision, the distribution of a product shows spatial concentration; but the places which concentrate a substantial portion of the total production may change from year to year, and different subsets of the total territory occupied by a product may move at different speeds. Three distance measures will be introduced in order to assess the motion of individual products; two of them correspond to mathematical concepts, while the third one gives the terrestrial distance between national centers of gravity of the products.

Coups, Earthquakes and Hostages? Foreign News on Canadian Television

1989 ◽  
Vol 22 (4) ◽  
pp. 809-826 ◽  
Author(s):  
Robert A. Hackett
Keyword(s):  
Geographical Distribution ◽  
Third World ◽  
English Language ◽  
News Coverage ◽  
The West ◽  
The Third ◽  
News Agencies ◽  
Foreign News ◽  
The Third World

AbstractForeign news coverage on Canadian national television was content analyzed in light of Third World criticisms of Western news agencies. Using a sample of CBC and CTV national English-language newscasts in 1980 and 1985, four hypotheses were considered: (1) the geographical distribution of foreign news is highly concentrated, focussing on the West and regions of violence involving Western interests; (2) news from the industrialized West and from the Third World tends to be characterized by different formats and topics; (3) differences between networks are limited; and (4) differences between the two years studied are minor. The results support these hypotheses, with the partial exception of the fourth one, to the detriment of the image of the Third World on Canadian television.

Landlocked Atlantic salmon in a large river-lake ecosystem: managing an endemic, large-bodied population of high conservation value

2020 ◽  
Author(s):  
Larry A. Greenberg ◽  
Johnny R. Norrgård ◽  
Pär Gustafsson ◽  
Eva Bergman
Keyword(s):  
Carrying Capacity ◽  
Habitat Restoration ◽  
Life Stage ◽  
Large River ◽  
Lake Ecosystem ◽  
Lake Ecosystems ◽  
Large Size ◽  
Salmon Population ◽  
High Conservation ◽  
Sustainable Fishery

Managing and conserving threatened migratory salmonid populations in large river-lake ecosystems is challenging not only because of the ecosystems’ large size, but also because there is often more than one anthropomorphic stressor. The River Klarälven-Lake Vänern ecosystem, situated in Norway and Sweden, is a large highly modified ecosystem, home to a threatened, endemic, large-bodied population of landlocked salmon. With 11 dams, the salmon population has been maintained through extensive stocking and a truck and transport system for spawners. Here we review what we have learned about the salmon after 15 years of research, highlighting the major findings for each life stage. Our studies indicate that the salmon population is below carrying capacity, and we suggest measures to increase the number of spawners and downstream passage success. Habitat restoration to compensate for losses from former log driving activities is expected to further increase carrying capacity. Re-establishing salmon in Klarälven’s upper reaches in Norway, while possible, is fraught with both ecological and legislative hurdles. Substantial long-term funding is needed to foster co-management and ensure a sustainable fishery.

An updated checklist of Canadian and Alaskan Collembola

Zootaxa ◽  
2019 ◽  
Vol 4592 (1) ◽  
pp. 1 ◽  
Author(s):  
ANATOLY BABENKO ◽  
SOPHYA STEBAEVA ◽  
MATTHEW S. TURNBULL
Keyword(s):  
Species Diversity ◽  
Geographical Distribution ◽  
Online Resources ◽  
Full Reference

The available literature data on the species diversity and geographical distribution of Collembola in Canada and Alaska is summarized. In total, the checklist covers 541 named species of Collembola. This includes 475 species in 135 genera from 24 families recorded from Canada, as well as 241 species in 75 genera from 19 families reported from Alaska. For each species the current name, basionym with a full reference, records for different provinces and territories with their authorships, and general distributional ranges are given. Taxonomic remarks have been added when necessary. The checklist is based on 536 references (including 262 with Canadian records) published up to May 2018 and on a number of publicly available online resources.

scholarly journals Macroinvertebrates and Microbes (Archaea, Bacteria) Offer Complementary Insights into Mine-Pit Lake Ecology

2019 ◽  
Vol 39 (3) ◽  
pp. 589-602 ◽  
Author(s):  
Melanie L. Blanchette ◽  
Richard Allcock ◽  
Jahir Gonzalez ◽  
Nina Kresoje ◽  
Mark Lund
Keyword(s):  
Water Chemistry ◽  
Environmental Drivers ◽  
Sediment Chemistry ◽  
Lake Ecosystem ◽  
Pit Lake ◽  
Lake Ecosystems ◽  
Assemblage Composition ◽  
Management Actions ◽  
Pit Lakes ◽  
Broad Objective

Abstract The broad objective of this research was to determine the environmental drivers of macroinvertebrate and microbial assemblages in acidic pit lakes. This is important because pit lake ecosystem development is influenced by prevailing environmental characteristics. Three lakes (Stockton, Kepwari, WO5H) within a larger pit-lake district in Collie, Western Australia were surveyed for spatial variability of benthic macroinvertebrate and microbe (Archaea, Bacteria) assemblage composition as well as potential environmental drivers (riparian condition, aquatic habitat, sediments, and aquatic chemistry) of assemblages. With the exception of sediment chemistry, biophysical variables were significantly different across lakes and reflected riparian condition and groundwater chemistry. Microbial assemblages in pit lakes were significantly different across lakes and correlated with water chemistry, particularly metals in Lake WO5H. However, the most abundant microbes were not readily identified beyond class, making it difficult to speculate on their ecological function. Macroinvertebrate assemblage composition and species richness were also significantly different across all lakes, and in Lake WO5H (a lake with low pH and high metal concentrations), taxa were correlated with benthic organic matter as well as water chemistry. Results indicated that despite poor water quality, input of nutrients from terrestrial leaf litter can support or augment pit lake ecosystems. This is a demonstration of the concept that connection of pit lakes to catchments can positively affect aquatic ecosystems, which can inform management actions for remediation.

Morphotaxonomic revision of Simulium (Gomphostilbia) (Diptera: Simuliidae) in the Oriental Region

Zootaxa ◽  
2012 ◽  
Vol 3577 (1) ◽  
pp. 1 ◽  
Author(s):  
HIROYUKI TAKAOKA
Keyword(s):  
Geographical Distribution ◽  
Classification Scheme ◽  
Cladistic Analysis ◽  
Morphological Characters ◽  
Species Group ◽  
Morphological Identification ◽  
Oriental Region ◽  
Preliminary Attempt ◽  
The Third ◽  
Species Groups

Simulium (Gomphostilbia) Enderlein, the third largest (206 named species included) in the genus Simulium Latreille s. l., is one of the two most abundant and diverse subgenera in the Oriental Region. To provide a classification scheme to facilitate morphological identification of the species within this subgenus, its diagnostic characters are redefined, and nine known species-groups within it are reviewed. Based on putative lineages explored by using certain adult morphological characters, seven more species-groups are proposed: asakoae, darjeelingense, epistum, gombakense, heldsbachense, hemicyclium and palauense species-groups, while the trirugosum species-group is merged in the varicorne species-group. Subgroups are also introduced to represent apparently different lineages within certain species-groups based on certain pupal morphological characters: two in the banauense species-group, seven in the batoense species-group redefined, four in the ceylonicum species-group redefined, four in the epistum species-group, two in the hemicyclium species-group, two in the sherwoodi species-group and four in the varicorne species-group redefined. A new checklist of species of the subgenus Gomphostilbia, and a key to all 15 species-groups within it are provided. The eastward expansion of the geographical distribution of the subgenus Gomphostilbia is inferred on the basis of the more frequent occurrence of apomorphic characters of certain adult and pupal morphological features in insular species-groups than in continental species-groups. A preliminary attempt using a cladistic analysis of morphological characters shows that among 10 subgenera examined, Gomphostilbia has a sister-taxon relationship with the Australasian subgenus Morops Enderlein, and this clade, together with the Central-Western Pacific subgenus Inseliellum Rubtsov, is positioned closest to the most derived clade formed by Daviesellum Takaoka & Adler and Simulium Latreille s. str.

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