A STUDY OF THE MAY FLIES (HEXAGENIA) OF LAKE WINNIPEG

1932 ◽  
Vol 7 (1) ◽  
pp. 177-201 ◽  
Author(s):  
FERRIS NEAVE
Keyword(s):  
Economic Status ◽  
Maximum Growth ◽  
Economic Importance ◽  
Coregonus Clupeaformis ◽  
Large Area ◽  
Lake Winnipeg ◽  
The North ◽  
Different Seasons ◽  
North Part ◽  
Males And Females

The economic status of the May flies (Hexagenia) of lake Winnipeg is discussed. The nymphs are particularly important as food for sturgeon (Acipenser fulvescens), whitefish (Coregonus clupeaformis), light-backed cisco or tullibee (Leucichthys zenithicus), goldeye (Hiodon chrysopsis), and sauger (Lucioperca canadense). Two species are present in abundance, H. limbata occulta and H. rigida, but the former outnumbers the latter by a ratio of 7 to 1. Characters are given for the separation of all stages of these species and their habits are described. Eggs of occulta were hatched after artificial insemination. Later development of both species was followed by statistical measurements of nymphs secured at different seasons. The life cycle extends over two years. Sizes at which moults take place are indicated. Maximum growth is in August and is correlated with the amount of phytoplankton in the lake. No growth takes place in winter. The number of nymphs of occulta of 10 mm. and more is estimated at 62,000,000 per sq. kilometre in the southern part of the lake, and 93,000,000 in the neighbourhood of the Narrows. Corresponding estimates for rigida are 4,500,000 and 44,000,000. Both species are scarce or absent over a large area in the north part of the lake. H. occulta shows a 10 per cent, preponderance of females but is probably not parthenogenetic. Males and females of rigida occur in equal numbers. Parasites are noted, but are local in distribution. Occulta is of greater economic importance than is indicated by the numerical ratio between the two species.

Current Status of Anserinae Wintering in Azov-Black Sea Region of Ukraine

2019 ◽  
Vol 53 (4) ◽  
pp. 297-312
Author(s):  
Yu. O. Andryushchenko ◽  
V. S. Gavrilenko ◽  
V. A. Kostiushyn ◽  
V. N. Kucherenko ◽  
A. S. Mezinov ◽  
...  
Keyword(s):  
Black Sea ◽  
Current Status ◽  
Anser Anser ◽  
Scientific Publications ◽  
Climate Conditions ◽  
Black Sea Region ◽  
Chen Caerulescens ◽  
Branta Bernicla ◽  
The North ◽  
Different Seasons

Abstract In the article is analyzed own field data of the authors and scientific publications on the wintering of Anserinae in the Azov-Black Sea region of Ukraine in 1900–2017, but the main data was obtained in frame of international mid-winter counts (IWC) in 2005–2017. It was found that 9 species of Anserinae occur in this region during the different seasons of the year: Anser anser — nesting, wintering and migrating; Rufibrenta ruficollis, A. albifrons, A. erythropus, A. fabalis — migrating and wintering; Branta canadensis, Branta leucopsis, Branta bernicla, Chen caerulescens — vagrant or birds which flew away from captivity (zoo etc.). Eulabeia indica — is possible vagrant species. The most numerous wintering species is A. albifrons, common — Rufibrenta ruficollis, not numerous — Anser anser, the other species are not met annually and registered in a very small number. There was almost tenfold drop in number of wintering geese in the Azov-Black Sea region of Ukraine during the period of counts. The main reasons of such reducing of geese amount are the followwing: weather and climate conditions, changes in the forage acessibility, hunting and poaching pressure, poisoning as a result of deratization of agricultural lands, and from 2014 — the militarization of the Syvash area and stop of water supplying of Crimea through the North Crimean channell. It is likely that the factors mentioned above led to relocating of wintering areas of Anserinae, and resulted in decreasing of their amount in this region.

Westward Palaearctic range expansion of Papilio demoleus Linnaeus, 1758 (Lepidoptera: Papilionidae) and its arrival at Mediterranean coastal regions of Turkey and Syria

2020 ◽  
Vol 71 (4) ◽  
pp. 257-272
Author(s):  
Onat Başbay ◽  
Mudar Salimeh ◽  
Eddie John
Keyword(s):  
Eastern Mediterranean ◽  
Economic Importance ◽  
Invasive Pest ◽  
Pest Species ◽  
Coastal Regions ◽  
The North ◽  
North Eastern ◽  
The World ◽  
Invasive Pest Species ◽  
Papilio Demoleus

We review the continuing and extensive spread of Papilio demoleus in south-eastern Turkey and in regions of Turkey and Syria adjacent to the north-eastern Mediterranean. Since the authors documented the arrival of this attractive but potentially destructive papilionid species at coastal areas of Syria in 2019, regular monitoring has confirmed successful overwintering there, as well as in Turkey. As previously indicated, P. demoleus is widely recognized as an invasive pest species in Citrus-growing areas of the world and hence its arrival is of potential economic importance to a region in which citrus is widely grown.

scholarly journals Physiological, Biochemical, and Growth Parameters of Fogera Cattle Calves to Heat Stress during Different Seasons in Sub-Humid Part of Ethiopia

Animals ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 1062
Author(s):  
Michael Abera ◽  
Yesihak Yusuf Mummed ◽  
Mitiku Eshetu ◽  
Fabio Pilla ◽  
Zewdu Wondifraw
Keyword(s):  
Heat Stress ◽  
Growth Parameters ◽  
Hematological Parameters ◽  
Average Temperature ◽  
High Weight Gain ◽  
Different Seasons ◽  
Current Production ◽  
Humidity Index ◽  
Males And Females ◽  
Number Of Males

Fogera cattle are among indigenous breeds of cattle in the northern part of Ethiopia. However, their response to heat stress (HS) under different seasonal variations has not been well investigated. This study was aimed to determine physiological, hematological, biochemical, and growth parameters of Fogera cattle calves to HS during dry season, short rainy, and long rainy. A total of 72 calves (24 for each season) that were 6 months of age with an equal number of males and females were evaluated for physiological, hematological, biochemical, and growth parameters. Daily ambient temperature (AT) and relative humidity (RH) were recorded two times per day during the study periods from which the daily average temperature–humidity index (THI) was calculated. The study revealed higher AT and THI during dry and short seasons while higher RH was observed during the long rainy season. Physiological parameters except rectal temperature were affected by the seasons. Hematological parameters were also affected by season except for packed cell volume. Biochemical and growth parameters were also significantly affected by the seasons. THI was positively related with physiological but negatively with growth parameters. Thus, the THI value of 66 can be considered as optimum for high weight gain and normal physiological response to HS in Fogera cattle calves under their current production system.

A revision of the Indo-Australian species of Stenobracon (Hymenoptera: Braconidae) parasitoids of lepidopterous stem borers of graminaceous crops

1996 ◽  
Vol 86 (3) ◽  
pp. 227-245 ◽  
Author(s):  
M. Jamil ◽  
K. Chishti ◽  
Donald L.J. Quicke
Keyword(s):  
Biological Control ◽  
Principal Components Analysis ◽  
Principal Components ◽  
Economic Importance ◽  
Stem Borers ◽  
Australian Species ◽  
Males And Females ◽  
Components Analysis ◽  
Subjective Synonym

AbstractThe genus Stenobracon Szépligeti which contains species of economic importance for biological control of lepidopterous borers of sugarcane, rice and other graminaceous crops in Asia, is revised. Principal components analysis was employed to help delineate species. Six species, distributed from Pakistan to Australia, are recognized. Stenobracon brevis, S. clarus and S. malensis are described as new and Stenobracon nicevillei (Bingham), S. deesae (Cameron) and S. oculatus Szépligeti are redescribed. Illustrated keys for males and females are provided. Phanaulax levituberculatus Cameron is a new junior subjective synonym of S. nicevillei and S. trifasciatus Szépligeti is a new junior subjective synonym of S. oculatus. Elphea flavomaculata Cameron is synonymized with Ischnobracon (Bracon) laboriosus Cameron (comb. n). Host records are summarized.

Oscillations of the Black Sea sea level in the north part of the coast

1999 ◽  
Vol 10 (2) ◽  
pp. 123-130
Author(s):  
Yu. I. Goryachkin ◽  
V. A. Ivanov ◽  
Yu. A. Stepanyants
Keyword(s):  
Sea Level ◽  
Black Sea ◽  
The Black Sea ◽  
The North ◽  
North Part

New Evidence of the Late Neopleistocene Peopling of the Lower Ob Valley

2021 ◽  
Vol 49 (1) ◽  
pp. 9-20
Author(s):  
I. D. Zolnikov ◽  
A. A. Anoikin ◽  
E. A. Filatov ◽  
A. V. Vybornov ◽  
A. V. Vasiliev ◽  
...  
Keyword(s):  
Upper Paleolithic ◽  
The Arctic ◽  
Northern Eurasia ◽  
West Siberian Plain ◽  
Faunal Remains ◽  
Human Occupation ◽  
Large Area ◽  
Paleolithic Site ◽  
The North ◽  
Available Information

This study focuses on the early human occupation of the arctic part of the West Siberian Plain and introduces the finds at the Paleolithic site Kushevat (Shuryshkarsky District, Yamal-Nenets Autonomous Okrug), discovered in 2020. Geological and geomorphological characteristics of the Lower Ob region are provided, the chronology of the key Middle and Late Neopleistocene sequences is assessed, and criteria underlying the search for Paleolithic sites in the area are outlined. We describe the discovery and excavations at Kushevat, its stratigraphy and its faunal remains. On the basis of correlation with neighboring key Late Neopleistocene sections with a representative series of absolute dates, the age of the site is estimated at cal 50–35 ka BP. Results of a traceological study of a possibly human-modified reindeer antler are provided. Findings at Kushevat and the available information on the early peopling of northern Eurasia suggest that the boundary of the inhabited part of that region must be shifted ~200 km to the north. The Ob, therefore, is one of the last major Siberian rivers where traces of the Early Upper Paleolithic culture have been found. The discovery of a stratified site in its lower stretch is a milestone in the Paleolithic studies in the region. A large area over which faunal remains are distributed, and the presence of lithics among the surface finds, suggest that Kushevat is a highly prospective site for future archaeological studies of the early stages in the human peopling of the region.

scholarly journals Improving MUSLE performance for sediment yield prediction at micro-watershed level using seasonal classified data

2018 ◽  
Vol 13 (3) ◽  
pp. 505-512
Author(s):  
Hamzeh Noor ◽  
Mohammad Rostami Khalaj
Keyword(s):  
Sediment Yield ◽  
Traditional Approach ◽  
Estimation Error ◽  
Superior Performance ◽  
North East ◽  
Erosion Processes ◽  
The North ◽  
East Of Iran ◽  
Different Seasons

Abstract Separating erosion data and assessing season-based models are of great importance considering the variation in soil erosion processes in different seasons, especially in semi-arid regions. However, evaluation of an erosion model using seasonal classification of data and at a micro-watershed level have rarely been considered. Therefore, the present study was conducted to evaluate the modified universal soil loss equation (MUSLE): 1) with the seasonal classification of data and 2) with the traditional approach (no classification of data), in the Sanganeh research micro-watershed. This watershed has an area of 1.2 ha and is located in the north east of Iran. The results showed that the original MUSLE overestimated the sediment yield in the study watershed. Also, after calibration of MUSLE, the seasonal classification of data (with a relative estimation error (RE) of 34%) showed its superior performance compared with the traditional calibration approach (with a RE of 62%). In this regard, the obtained REs of 33, 40, and 31% respectively for spring, autumn, and winter are within or close to the acceptable range.

Vowel raising in Basaa: a synchronic chain shift

Phonology ◽  
1996 ◽  
Vol 13 (2) ◽  
pp. 239-267 ◽  
Author(s):  
Deborah Schlindwein Schmidt
Keyword(s):  
Phonological Representation ◽  
Large Area ◽  
Bantu Languages ◽  
North East ◽  
The North ◽  
Equatorial Africa ◽  
Verb Forms ◽  
Vowel Raising

Like many of the zone A Bantu languages of western equatorial Africa, Basaa, which is spoken over a large area to the north-east and east of Douala, Cameroon, shows an inventory of seven surface vowels (Guthrie 1953). The Basaa forms cited in this article, all of which are found in the comprehensive Dictionnaire Basaa-Français (Lemb & de Gastines 1973), are transcribed using the vowel symbols in (1):These vowel symbols differ from those used by Guthrie only in that the hooks are eliminated from underneath his [i] and [u] and the dots are eliminated from underneath his [???] and [???]. I assume for these vowels the characteristics indicated in (1), where non-parenthesised feature specifications are a property of surface phonological representation and parenthesised feature specifications are default phonetic values. Following Hyman's (1988) analysis of Esimbi, another Cameroonian language containing these vowels in its inventory, I take [E] and [ɔ] to be low.The verb roots in (2) contain instances of each of the seven surface vowels of Basaa:Though bare verb roots may surface unsuffixed, suffixal extensions may also be added to give applied, passive, habitual, direct causative, indirect causative, simultaneous, associative, possessive, reversive, reflexive, stative and nominalised forms. Of interest to us is the vowel raising induced within the verb root when certain of these suffixal extensions are added. In (3) we see the CVC verb forms of (2) along with their corresponding applied and indirect causative forms:Other suffixal extensions that induce raising are the passive, direct causative, simultaneous, reversive and stative extensions. For example, these other suffixal extensions attach to /ten/, one of the verb roots in (3), to give [tina], [tinis], [tinha], [tinil] and [tiní], respectively.

scholarly journals Recognition in international law: The case of Kosovo and Metohija

2015 ◽  
pp. 289-306
Author(s):  
Tijana Surlan
Keyword(s):  
International Law ◽  
Constitutive Theory ◽  
Sovereign State ◽  
Public International Law ◽  
The Public ◽  
The North ◽  
Official Position ◽  
The Status ◽  
North Part ◽  
The Eu

Recognition is an instrument of the public international law founded in the classical international law. Still, it preserves its main characteristics formed in the period when states dominated as the only legal persons in international community. Nevertheless, the instrument of recognition is today as vibrant as ever. As long as it does not have a uniform legal definition and means of application, it leaves room to be applied to very specific cases. In this paper, the instrument of recognition is elaborated from two aspects - theoretical and practical. First (theoretical) part of the paper presents main characteristics of the notion of recognition, as presented in main international law theories - declaratory and constitutive theory. Other part of the paper is focused on the recognition in the case of Kosovo. Within this part, main constitutive elements of state are elaborated, with special attention to Kosovo as self-proclaimed state. Conclusion is that Kosovo does not fulfill main constitutive elements of state. It is not an independent and sovereign state. It is in the status of internationalized entity, with four international missions on the field with competencies in the major fields of state authority - police, judiciary system, prosecution system, army, human rights, etc. Main normative framework for the status of Kosovo is still the UN Resolution 1244. It is also the legal ground for international missions, confirming non-independent status of Kosovo. States that recognized Kosovo despite this deficiency promote the constitutive theory of recognition, while states not recognizing Kosovo promote declaratory theory. Brussels Agreement, signed by representatives of Serbia and Kosovo under the auspices of the EU, has also been elaborated through the notion of recognition - (1) whether it represents recognition; (2) from the perspective of consequences it provokes in relations between Belgrade and Pristina. Official position of Serbian Government is clear - Serbia does not recognize Kosovo as an independent and sovereign state. On the other hand, subject matter of Brussels Agreement creates new means of improvement for Kosovo authorities in the north part of Kosovo. Thus, Serbian position regarding the recognition is twofold - it does not recognize Kosovo in foro externo, and it completes its competences in foro domestico. What has been underlined through the paper and confirmed in the conclusion is that there is not a recognition which has the power to create a state and there is not a non-recognition which has the power to annul a state.

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