Observations on the Development of Neodiprion sertifer (Geoff.) within the Cocoon (Hymenoptera: Diprionidae)

1962 ◽  
Vol 94 (9) ◽  
pp. 994-1001 ◽  
Author(s):  
L. A. Lyons ◽  
K. J. Griffiths
Keyword(s):  
Late Summer ◽  
Extended Period ◽  
Wide Distribution ◽  
The Other ◽  
Neodiprion Sertifer ◽  
Larval Feeding ◽  
Pine Sawfly ◽  
The One ◽  
European Pine Sawfly ◽  
Taxonomic Categories

In Neodiprion sawflies the cocoon stage, which extends from the completion of larval feeding until the appearance of the adult, is of considerable ecological interest. On the basis of voltinism and the seasonal occurrence of the cocoon stage, the genus as a whole may be divided into two distinct groups, which, however, do not correspond to the two major taxonomic categories of Ross (1955). On the one hand are species that overwinter only within the cocoon (e.g. swainei, lecontei, virginianus, excitans, and others); these may or may not have more than one generation per year. On the other hand are species that overwinter primarily in the egg stage (e.g. sertifer, pratti, abietis, taedae, and others); all of these are univoltine and may remain within the cocoon for an extended period in the summer, when conditions are still favourable for further generations. The European pine sawfly, Neodiprion sertifer (Geoff.), is typical in this respect. Despite its wide distribution in Eurasia and North America, and the variety of climates that it encounters, the length of the cocoon stage is so adjusted that adults do not emerge until late summer or early autumn, regardless of when larval feeding and cocoon spinning occurred.

scholarly journals XXIII.—On the Disruptive Discharge of Electricity: An Experimental Thesis for the Degree of Doctor of Science, Department A

1878 ◽  
Vol 28 (2) ◽  
pp. 633-671 ◽  
Author(s):  
Alexander Macfarlane
Keyword(s):  
Copper Wire ◽  
Late Summer ◽  
The Other ◽  
Straight Line ◽  
Summer Session ◽  
The Difference ◽  
A Chain ◽  
The One ◽  
Metallic Parts ◽  
The University

The experiments to which I shall refer were carried out in the physical laboratory of the University during the late summer session. I was ably assisted in conducting the experiments by three students of the laboratory,—Messrs H. A. Salvesen, G. M. Connor, and D. E. Stewart. The method which was used of measuring the difference of potential required to produce a disruptive discharge of electricity under given conditions, is that described in a paper communicated to the Royal Society of Edinburgh in 1876 in the names of Mr J. A. Paton, M. A., and myself, and was suggested to me by Professor Tait as a means of attacking the experimental problems mentioned below.The above sketch which I took of the apparatus in situ may facilitate tha description of the method. The receiver of an air-pump, having a rod capable of being moved air-tight up and down through the neck, was attached to one of the conductors of a Holtz machine in such a manner that the conductor of the machine and the rod formed one conducting system. Projecting from the bottom of the receiver was a short metallic rod, forming one conductor with the metallic parts of the air-pump, and by means of a chain with the uninsulated conductor of the Holtz machine. Brass balls and discs of various sizes were made to order, capable of being screwed on to the ends of the rods. On the table, and at a distance of about six feet from the receiver, was a stand supporting two insulated brass balls, the one fixed, the other having one degree of freedom, viz., of moving in a straight line in the plane of the table. The fixed insulated ball A was made one conductor with the insulated conductor of the Holtz and the rod of the receiver, by means of a copper wire insulated with gutta percha, having one end stuck firmly into a hole in the collar of the receiver, and having the other fitted in between the glass stem and the hollow in the ball, by which it fitted on to the stem tightly. A thin wire similarly fitted in between the ball B and its insulating stem connected the ball with the insulated half ring of a divided ring reflecting electrometer.

scholarly journals ‘Whose context collapse?’: Ethical clashes in the study of language and social media in context

2017 ◽  
Vol 8 (2-3) ◽  
pp. 169-189 ◽  
Author(s):  
Alexandra Georgakopoulou
Keyword(s):  
Social Media ◽  
New Media ◽  
Wide Distribution ◽  
The Other ◽  
Contextual Analysis ◽  
News Stories ◽  
The Social ◽  
Communication Practices ◽  
Media Research ◽  
The One

AbstractThe longstanding tradition of the examination of language and discourse in context has not only spurred the turn to issues of context in language and new media research but it has also led to numerous methodological and analytical deliberations, for instance regarding the roles and nature of digital ethnography and the need for an adaptive, ‘mobile’ sociolinguistics. Such discussions center around social media affordances and constraints of wide distribution, multi-authorship and elusiveness of audiences which are often described with the term ‘context collapse’ (Marwick and boyd 2011; Wesch 2008). In this article, I argue that, however helpful the insights of such studies may have been for linking social media affordances and constraints with users’ communication practices, the ethical questions of where context collapse leaves the language-in-context analysts have far from been addressed. I single out certain key challenges, which I view as ethical clashes, that I experienced in connection with context collapse in my data of the social media circulation of news stories from crisis-stricken Greece. I argue that these ethical clashes are linked with context collapse processes and outcomes on the one hand and sociolinguistic contextual analysis priorities on the other hand. I put forward certain proposals for resolving these clashes arguing for a discipline-based virtue ethics that requires researcher reflexivity and phronesis.

CANDLING AND SIGHTING TECHNIQUES USED IN LASER INVESTIGATIONS OF THE EUROPEAN PINE SAWFLY, NEODIPRION SERTIFER (HYMENOPTERA: DIPRIONIDAE)

1967 ◽  
Vol 99 (6) ◽  
pp. 670-672 ◽  
Author(s):  
Ronald W. Kobylnyk
Keyword(s):  
Laser Treatment ◽  
Light Transmission ◽  
Transmitted Light ◽  
Neodiprion Sertifer ◽  
Accurate Assessment ◽  
Pine Sawfly ◽  
Avian Eggs ◽  
Egg Shell ◽  
European Pine Sawfly ◽  
Zoology Department

Laser treatment of larval and pupal stages within cocoons of Neodiprion sertifer (Geoff.) requires an accurate assessment of viability and the antero-posterior alignment of the cocoon content. The use of the candling technique to assess qualitative features of avian eggs depends on the translucency of the egg shell and the differences in light transmission by other elements within it (Romanoff and Romanoff 1949). Transmitted-light methods have been employed for insects within cocoons by Cushman (1913) and Hanna (1935). A type of candling technique different from previous methods and which was developed in the Zoology Department, University of Guelph, enables N. sertifer cocoon content to be ascertained and is herein described.

A constructional account of the ‘optional’ quotative marking on Japanese mimetics

2015 ◽  
Vol 52 (2) ◽  
pp. 245-275 ◽  
Author(s):  
KIMI AKITA ◽  
TAKESHI USUKI
Keyword(s):  
Wide Distribution ◽  
The Other ◽  
Complex Predicates ◽  
Fundamental Function ◽  
Minimal Loss ◽  
Other Hand ◽  
The One

This paper proposes a constructional account of the longstanding issue of the optional quotativeto-marking on manner-adverbial mimetics (or ideophones) in Japanese. We argue that this optionality comes from the availability of two morphological constructions – the bare-mimetic predicate construction and the quotative-adverbial construction – to a set of mimetics. On the one hand, the bare-mimetic predicate construction incorporates previously identified phonological, syntactic, and semantic conditions of the bare realization of mimetics. This construction is instantiated by bare mimetics (e.g.pyókopyoko‘jumping around quickly’) in combination with their typical host predicates (e.g.hane-‘jump’), and they behave as loose complex predicates with more or less abstract meanings. As with ‘say’- and ‘do’-verbs, these complex predicates involve quasi-incorporation, which is a constructional strategy for the morphosyntactic integration of mimetics into sentence structures. On the other hand, the quotative-adverbial construction introduces mimetics to sentences with a minimal loss of their imitative semiotics. This fundamental function is consistent with the wide distribution of quotative-marked mimetics.

POTENTIAL OF ANTIFEEDANTS TO CONTROL LARVAL FEEDING OF SELECTED NEODIPRION SAWFLIES (HYMENOPTERA: DIPRIONIDAE)

1976 ◽  
Vol 108 (11) ◽  
pp. 1137-1144 ◽  
Author(s):  
J. N. All ◽  
D. M. Benjamin
Keyword(s):  
Pinus Banksiana ◽  
Feeding Habits ◽  
Field Tests ◽  
Field Studies ◽  
Jack Pine ◽  
Larval Feeding ◽  
Pine Sawfly ◽  
European Pine Sawfly ◽  
Feeding Development ◽  
Laboratory Bioassays

AbstractAntifeedants for controlling larval feeding of several Neodiprion sawflies were evaluated in laboratory and field studies. Nine commercially available insect antifeedants and a hexane extract of the juvenile foliage of jack pine, Pinus banksiana Lambert, were tested on larvae of six species. In laboratory bioassays larvae exhibited varying sensitivity to antifeedants; generally species with monophagous or restricted oligophagous feeding habits were most sensitive. In the laboratory the Swaine jack pine sawfly, Neodiprion swainei Middleton, had severely restricted feeding, development, survival, and fecundity. Triphenyltin hydroxide was toxic to N. swainei and to European pine sawfly, N. sertifer (Geoffroy). In field tests certain antifeedants disrupted N. swainei feeding and development. The colonial behavior of larvae often was disrupted and solitary larvae fell from trees or wandered on twigs. Colony disruption by most antifeedants was temporary and many larvae resumed feeding.

Effects of Temperatures of Rearing on Reproduction of Aptesis basizona (Grav.) (Hymenoptera: Ichneumonidae)

1961 ◽  
Vol 93 (9) ◽  
pp. 799-801 ◽  
Author(s):  
Thelma Finlayson
Keyword(s):  
Cold Storage ◽  
Reproductive Capacity ◽  
Neodiprion Sertifer ◽  
Immature Stages ◽  
Pine Sawfly ◽  
Pine Sawflies ◽  
European Pine Sawfly

Aptesis basizona (Grav.), a parasite of pine sawflies in Europe, was propagated at Belleville, Ont. (Green, 1938) for release against the European spruce sawfly, Diprion hercyniae (Htg.), the European pine sawfly, Neodiprion sertifer (Geoff.) and other Diprionidae. Development of the insects in the laboratory was allowed to continue until feeding was completed and cocoons were spun, and was then retarded by placing the insects in cold storage pending shipment to release areas. Frequently stock for propagation was incubated after a period of cold storage, and occasionally the schedule was interrupted by decreases in the reproductive capacity of the adults. It seemed that there was some relationship between the fertility of the adults and the temperatures at which the immature stages were held, both while feeding and after they had reached the fully-fed stage. Experiments were initiated to investigate this hypothesis.

ROW-TYPE OVIPOSITION IN NEODIPRION SAWFLIES AS EXEMPLIFIED BY THE EUROPEAN PINE SAWFLY, N. SERTIFER (GEOFF.)

1959 ◽  
Vol 37 (3) ◽  
pp. 267-281 ◽  
Author(s):  
A. W. Ghent
Keyword(s):  
Oviposition Behavior ◽  
The Other ◽  
Leg Length ◽  
Forward Movement ◽  
Pine Sawfly ◽  
Leg Movement ◽  
European Pine Sawfly ◽  
Antennal Movement ◽  
Leg Movements

Many Neodiprion sawflies lay their eggs in a row in small pockets cut into the edges of the mature needles of various pines. These rows of eggs are remarkable for the regularity of the spacing between successive egg pockets. The regularity of egg spacing by N. sertifer is shown to arise from a stereotyped pattern of leg movements during the shift between the sites of successive egg pockets. Spacing is effected by two sets of leg movements, in each of which the three pairs of legs move forward in order from back to front. While the effective forward movement of all legs is the same, the total forward movement of the metathoracic legs is greater than that of the other legs by an amount equal to the length of an egg pocket. The metathoracic legs retrace their steps by this length as the initial incision for each new egg pocket is cut, evidently providing the force by which this incision is made. The grip-points of the legs are on the needle edge opposite to that receiving eggs, so that the wider the needle, the greater the proportion of leg length required to reach across it, and the smaller the proportion of leg movement reflected in the spacing between eggs. In this way egg spacing varies inversely with needle width. Observations on copulation, antennal movement, and related oviposition behavior are included.

Sign in / Sign up

Export Citation Format

Share Document