OBSERVATIONS ON THE LIFE HISTORY AND HABITS OF ALNIPHAGUS ASPERICOLLIS (COLEOPTERA: SCOLYTIDAE) IN SOUTHWESTERN BRITISH COLUMBIA

1969 ◽  
Vol 101 (8) ◽  
pp. 870-878 ◽  
Author(s):  
John H. Borden
Keyword(s):  
British Columbia ◽  
Life History ◽  
Bark Beetle ◽  
Second Generation ◽  
Mature Adults ◽  
Inner Bark ◽  
Standing Trees

AbstractThe alder bark beetle, Alniphagus aspericollis (LeConte), is bivoltine on Burnaby Mountain, B.C. The principal spring attack occurred in May and the second generation attack from mid July to early August. Mature adults overwinter in shallow galleries underneath the bark while larvae, pupae, and callow adults overwinter in the brood galleries. Sporadic emergence occurred in warm periods throughout the winter but the first egg galleries were not observed until early March. Windfalls and standing trees were attacked.Adult sexes can be distinguished by the fused (female) or separate (male) seventh and eighth abdominal tergites. Females attack the host first and are soon joined by the males. Single egg galleries extending about 8 cm parallel to the length of the bole are most common. Eggs are laid on both sides of the gallery; the larvae mine outward at right angles to the egg gallery and then usually up or down the bole. Adult gallery construction and oviposition and larval mining habits were observed through plexiglass–bark "sandwiches," and are similar to those in the genus Ips. Pupation occurs in a chamber in the inner bark. Maturation from egg to callow adult required a minimum of 8 weeks.

Telling Diaspora Stories: theoretical and methodological reflections on narratives of migrancy and belongingness in the second generation

2009 ◽  
Vol 6 (2) ◽  
pp. 143-153 ◽  
Author(s):  
Anastasia Christou
Keyword(s):  
Life History ◽  
Second Generation ◽  
Life Stories ◽  
Narrative Research ◽  
Social Experiences ◽  
Biographical Approach ◽  
The Subject

This article explores the theoretical and methodological implications of the study of second generation migration through the use of life stories, a narrative and biographical approach. It presents a theoretical contextualisation of life history research in addressing the direction it has taken in the study of migration and identity in order to problematise how the subject and subjectivities in narrative research have been framed by social categorisations such as gender, ethnicity, class as well as social experiences such as trauma, exile, memory and imagination. The paper develops the analytical contribution of researching the biographicity of everyday migrant lives. 

scholarly journals Experiences of second-generation students of Punjabi Sikh ancestry in the British Columbia school system

2020 ◽  
Author(s):  
◽  
Amardeep Sull
Keyword(s):  
British Columbia ◽  
School System ◽  
Second Generation ◽  
School Experiences ◽  
Large Majority ◽  
School Type ◽  
Minority Population ◽  
Small Minority ◽  
Columbia School ◽  
Majority Population

Punjabi Sikhs migrating to Canada form a disproportionately large population of the migrants from South Asia. There has been limited research or current literature on the schooling experiences of the second-generation children of these migrants despite the large numbers of this group migrating to Canada. The effects of minority status within the K-12 British Columbia school system regarding school experiences of second-generation students of Punjabi Sikh descent are presented throughout this research process. The investigation focused on the research participants’ perceived school experiences and whether there were differences based on the school type’s demographic composition of responders. I categorized these school types into three: small minority population, large minority population, and large majority population. I hypothesized that schools with large majority populations would have greater perceived satisfaction with school experiences. I found that I could further analyze by subscale and total scale groupings, based on my original correlational analysis. I found differences on school experiences (SE) and home experiences (HE) subscales based on school type, school type being differentiated by schools with a minority population, a large minority population, or a large majority population of the responder demographic of second-generation students of Punjabi Sikh descent. I found that responders from small minority population schools and large minority population schools showed a statistically significant difference in responses than responders from large majority population schools.

Life-History and Natural Control in British Columbia of Ocnerostoma piniariella Zell. (Lepidoptera: Yponomeutidae), a Needle Miner on White Pine

1958 ◽  
Vol 90 (10) ◽  
pp. 627-631 ◽  
Author(s):  
Peter Harris
Keyword(s):  
New York ◽  
British Columbia ◽  
Life History ◽  
North America ◽  
Pinus Sylvestris ◽  
Scots Pine ◽  
Swiss Alps ◽  
Natural Control ◽  
Pinus Cembra ◽  
White Pine

Ocnerostoma piniariella Zell. is an unimportant pest of Scots pine, Pinus sylvestris L., in Europe. A variety, copiosella Frey, is found in the Swiss Alps attacking a white pine, Pinus cembra L., and sometimes occurs in sufficient numbers to reduce growth. Both European forms have a life-history similar to that described here for British Columbia.In North America, specimens identified as O. piniariella were collected in 1882 at Ithaca, New York (Forbes, 1924). The first Canadian record was for 1922 at Abbotsford, British Columbia, from white pine (Felt, 1922). The species has since been found in British Columbia at Vancouver, Victoria, Langley, and Aldergrove. Dr. T. N. Freeman (in litt.), Entomology Division, Ottawa, has collected it at Constance Bay, South March, Ottawa, and Bells Corners, Ontario.

Influence of a reservoir with surface release on the life history of the mayfly Heterocloeon curiosum (McDunnough) (Ephemeroptera: Baetidae)

1981 ◽  
Vol 59 (2) ◽  
pp. 305-314 ◽  
Author(s):  
Boris C. Kondratieff ◽  
J. Reese Voshell Jr.
Keyword(s):  
Life History ◽  
Benthic Macroinvertebrates ◽  
Temperature Regime ◽  
Life Histories ◽  
Second Generation ◽  
Larval Instars ◽  
History Of ◽  
Lake Anna

The life history of Heterocloeon curiosum was compared in the impounded North Anna River (NAR) and the free-flowing South Anna River (SAR) in Virginia, U.S.A. The study site on the NAR was 32 km below Lake Anna, a surface-release reservoir. Heterocloeon curiosum was bivoltine in both rivers with two summer generations and probable overwintering in the egg stage. It passed through 10 larval instars (range 9–12) in both rivers. The density of larvae was twice as great in the SAR as the NAR. Factors which may have contributed to the lesser success of H. curiosum in the NAR included bottom scouring produced by sudden increases in discharge, absence of the macrophyte Podostemum, quality of available food, and alterations of the temperature regime. Of these four factors, temperature probably had the most significant effect. The emergence of the second generation was 1 month later in the NAR because the reservoir delayed the normal seasonal cooling of the river. The nonoptimal temperature regime appeared to significantly reduce the fecundity of H. curiosum in the NAR. Our data indicate that surface-release reservoirs may have subtle but significant effects on the life histories of benthic macroinvertebrates.

scholarly journals Contribution to bionomy of Hylesinus fraxini (Coleoptera: Curculionidae: Scolytinae) and its monogamy in the Czech Republic

2015 ◽  
Vol 61 (4) ◽  
pp. 240-245
Author(s):  
Karolina Lukášová ◽  
Soňa Zimová
Keyword(s):  
Czech Republic ◽  
Bark Beetle ◽  
Bark Beetles ◽  
Second Generation ◽  
Female Offspring ◽  
Fraxinus Excelsior ◽  
The Czech Republic ◽  
Gallery System

Abstract This study focused on bionomics of the ash bark beetle Hylesinus fraxini (Panzer 1779). The study area was at Jílové u Prahy in the Central Bohemian Region of the Czech Republic. In February 2014, three common ash (Fraxinus excelsior) trees were felled and Hylesinus fraxini infestation was subsequently observed from March. Beetles were collected from 20 debarked logs and dissected under stereomicroscope, and their sex was determined. Five logs with bark beetles were placed into photoeclectors. Beetles that emerged were collected and put into the second photoeclector with fresh ash wood to determine whether they would establish the second generation. The analysis showed that each gallery system with a pair of bark beetles contained one male with only one female. If one adult of H. fraxini was found in the gallery system, it was usually female. Therefore, possible polygamy of Hylesinus fraxini was not confirmed in Central Bohemia. Maternal gallery length significantly correlated with the number of eggs laid per female. Offspring beetles did not establish the second generation, as only maturation feeding occurred in fresh wood.

THE STAGES OF ERANNIS VANCOUVERENSIS (LEPIDOPTERA: GEOMETRIDAE) AND LIFE HISTORY NOTES

1973 ◽  
Vol 105 (4) ◽  
pp. 605-612 ◽  
Author(s):  
David Evans
Keyword(s):  
British Columbia ◽  
Life History ◽  
Virus Disease ◽  
Pupal Stage ◽  
Early Spring ◽  
Deciduous Trees ◽  
Life Stages ◽  
Larval Instars ◽  
Central California ◽  
Young Leaves

AbstractErannis vancouverensis Hulst occurs from northern British Columbia to central California, and has been occasionally reported at infestation levels. The larvae feed on young leaves of several species of deciduous trees; winter is passed in the egg or sometimes in the pupal stage; adults emerge during late autumn or occasionally during winter or early spring; females are wingless. The life stages, including larval instars, are described here in detail. Virus disease and parasitism by tachinid flies help control the species.

THE BIRDS OF THE CARIBOO PARKLANDS, BRITISH COLUMBIA

1945 ◽  
Vol 23d (3) ◽  
pp. 17-103 ◽  
Author(s):  
J. A. Munro
Keyword(s):  
British Columbia ◽  
Life History ◽  
Human Activities ◽  
Lodgepole Pine ◽  
Migration Route ◽  
Bird Population ◽  
Rapid Process ◽  
Waterfowl Habitat ◽  
Consequent Reduction ◽  
Land Bird

The interior plateau of British Columbia between the 51st and 53rd parallels of latitude and the 120th and 126th degrees of west longitude constitute a definite biotic area designated as the Cariboo Parklands. Composite forests of lodgepole pine and aspen, grasslands, and shallow valleys containing numerous lakes, ponds, and marshes of various types are the principal physiographical features. Ten vertebrate habitats, each with a characteristic biota, are recognized. The region is an important migration route for waterfowl and constitutes the principal, and for some species the most northerly, nesting ground in the province. Nesting grounds are in units that vary greatly in size, in type of cover, and in their food potentials. They are subject to contraction in space, and consequent reduction in productivity, because of periodic seasons of drought. The biota is in rapid process of modification as a result of various human activities. Agricultural developments permanently impaired waterfowl habitat in some places but in other places, where the outlets of ponds have been dammed in order to store water for irrigation purposes, nesting grounds have been improved. The summer land bird population is derived mainly from the south and it includes several species that here reach the northern periphery of their range. The population also contains species of eastern origin that are not known to nest further south in the province. A total of 212 species and subspecies of birds are recorded for the region. Observations of the life history and behaviour of certain species are presented in detail.

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