REVIEW OF HOLARCTIC TARSONEMID MITES (ACARINA: PROSTIGMATA) PARASITIZING EGGS OF IPINE BARK BEETLES

1969 ◽  
Vol 101 (S60) ◽  
pp. 5-111 ◽  
Author(s):  
Evert E. Lindquist
Keyword(s):  
Life History ◽  
Bark Beetles ◽  
Population Regulation ◽  
Species Group ◽  
The Other ◽  
Closely Related Species ◽  
As Species ◽  
Egg Parasitism ◽  
Generic Description

AbstractA group of tarsonemid mites, which are egg parasites of ipine bark beetles, is reviewed on a Holarctic basis. The genus Iponemus (new name for Moseria Beer and Nucifora) is proposed and described for the group, and 24 species or subspecies, including 19 described as new, are described, keyed, and illustrated. A detailed species-group description follows the generic description, and includes several structures hitherto not reported for species of Tarsonemidae. The variation and usefulness of the few characters available for distinguishing forms of Iponemus is discussed, and the provisional treatment of some forms as species and others as subspecies is explained.These mites are among the most host-specific associates of scolytid beetles: 16 of the 18 species or subspecies of Iponemus associated with the nearctic, pine-feeding ipines are monospecific, and each of the other two is restricted to two closely related species of hosts. The mites and the beetles together are considered with regard to size correlations, the degree of host specificity, the mites as taxonomic indicators of their hosts, biogeography, life history, and the role of egg parasitism by the mites in the population regulation of their hosts.

A NEW SPECIES OF THE PERILISSUS ANATINUS SPECIES GROUP AND NOTES ON THE RELATIONSHIPS OF THE SPECIES GROUPS OF PERILISSUS (HYMENOPTERA, ICHNEUMONIDAE, CTENOPELMATINAE)

1994 ◽  
Vol 126 (2) ◽  
pp. 219-224 ◽  
Author(s):  
John Barron
Keyword(s):  
Species Group ◽  
Included Study ◽  
The Other ◽  
Southern Mexico ◽  
Closely Related Species ◽  
Mountain Ranges ◽  
Species Groups ◽  
Relationship Of ◽  
The Relationship ◽  
A New Species

AbstractIndividuals of Perilissus nudus sp.nov. of the Perilissus anatinus species group are described. This species, which occurs in the mountain ranges of southern Mexico and Costa Rica, is compared with the closely related species P. anatinus Barron. Locality data on additional specimens of P. anatinus, found in mountain ranges in Mexico, are included. Study of characteristics of P. nudus in relation to P. anatinus clarifies further the relationship of this species group with the other species groups of Perilissus.

A review of Triops granarius (Lucas, 1864) sensu lato (Notostraca: Triopsidae) of southern Africa and Madagascar, with comments on the group

2020 ◽  
Author(s):  
D Christopher Rogers ◽  
Martin Schwentner ◽  
Tatenda Dalu ◽  
Ryan J Wasserman
Keyword(s):  
Southern Africa ◽  
Current Knowledge ◽  
Species Group ◽  
Molecular Techniques ◽  
The Other ◽  
Apical Portion ◽  
Similar Morphology ◽  
As Species ◽  
Species Inquirenda ◽  
Morphological Species

Abstract We review the current knowledge surrounding the Triops granarius morphological species group globally, and present a revision of the southern African T. granarius forms based on collections from southern Africa and Madagascar. We also provide comparisons with other material of T. granarius from outside this region. We revise the morphological descriptions of T. numidicus (Grube, 1865) and T. namaquensis (Richters, 1886) using modern standards, and resurrect T. sakalavus  Nobili, 1905 from synonymy, using both morphological and molecular techniques. Morphological definitions focus primarily on the form of the apical portion of the thoracopod II endite. Differential diagnoses are presented for the three species, including characters that separate them from the other members with similar morphology. Furthermore, we treat T. dybowskii (Braem, 1893), T. orientalis (Tiwari, 1951), and T. mavliensis (Tiwari, 1951), which had been recently resurrected, as species inquirenda.

Polyploidy and apomixis in the Casuarina distyla species group

1959 ◽  
Vol 7 (3) ◽  
pp. 238 ◽  
Author(s):  
BA Barlow
Keyword(s):  
Breeding System ◽  
Related Species ◽  
Genetic System ◽  
Species Group ◽  
The Other ◽  
Diploid Population ◽  
Closely Related Species ◽  
Triploid Plant

In the Casuarina distyla species group, which includes 13 closely related species, sexual tetraploid forms have been recorded in nine species and apomictic triploids in four. These forms are probably autopolyploids. The triploid apomiots are presumably diplosporous and parthenogenetic, and in two species are pseudogamous, but not in the other two. It is suggested that a transition from the former to the latter breeding system would follow elimination of the need for pseudogamy. A hypothesis is presented that polyploidy and apomixis have arisen together within the species through establishment in a diploid population of a triploid plant which is diplosporous and parthenogenetic. The genetic system involved probably spread through the group during the evolution of the species, giving them a potential for this kind of development.

r- and K-Selection Revisited: The Role of Population Regulation in Life-History Evolution

Ecology ◽  
2002 ◽  
Vol 83 (6) ◽  
pp. 1509 ◽  
Author(s):  
David Reznick ◽  
Michael J. Bryant ◽  
Farrah Bashey
Keyword(s):  
Life History ◽  
Population Regulation ◽  
Life History Evolution ◽  
History Evolution

Biology and Taxonomy of Mites of the Genus Tarsonemoides (Acarina: Tarsonemidae) Parasitizing Eggs of Bark Beetles of the Genus Ips

1961 ◽  
Vol 93 (11) ◽  
pp. 982-999 ◽  
Author(s):  
Evert E. Lindquist ◽  
William D. Bedard
Keyword(s):  
Life History ◽  
Related Species ◽  
Bark Beetles ◽  
Closely Related Species ◽  
First Time

This study was originally undertaken so as to provide information on the life history and ecology of Tarsonemoides truncatus (Ewing), to describe for the first time the developmental instars and male, and to redescribe the female of this species. Research soon indicated, however, that a group of closely related species of mites, including T. truncatus, was involved and that the problems to be investigated were more complex and extensive than anticipated.

Plasma Levels of Protein S, Protein C, and Factor X: Effects of Sex, Hormonal State and Age

1995 ◽  
Vol 74 (05) ◽  
pp. 1271-1275 ◽  
Author(s):  
C M A Henkens ◽  
V J J Bom ◽  
W van der Schaaf ◽  
P M Pelsma ◽  
C Th Smit Sibinga ◽  
...  
Keyword(s):  
Regression Analysis ◽  
Postmenopausal Women ◽  
Protein C ◽  
Blood Donors ◽  
Premenopausal Women ◽  
Protein S ◽  
The Other ◽  
Factor X ◽  
Normal Ranges

SummaryWe measured total and free protein S (PS), protein C (PC) and factor X (FX) in 393 healthy blood donors to assess differences in relation to sex, hormonal state and age. All measured proteins were lower in women as compared to men, as were levels in premenopausal women as compared to postmenopausal women. Multiple regression analysis showed that both age and subgroup (men, pre- and postmenopausal women) were of significance for the levels of total and free PS and PC, the subgroup effect being caused by the differences between the premenopausal women and the other groups. This indicates a role of sex-hormones, most likely estrogens, in the regulation of levels of pro- and anticoagulant factors under physiologic conditions. These differences should be taken into account in daily clinical practice and may necessitate different normal ranges for men, pre- and postmenopausal women.

On the role of the dispute between "non-possessors" and "Josephites" in the culture of Moscow's prediction

1998 ◽  
pp. 61-62
Author(s):  
N. S. Jurtueva
Keyword(s):  
The Other ◽  
Moral Transformation ◽  
15Th Century ◽  
The Future ◽  
Secular Power

In the XIV century. centripetal tendencies began to appear in the Moscow principality. Inside the Russian church, several areas were distinguished. Part of the clergy supported the specificobar form. The other understood the need for transformations in society. As a result, this led to a split in the Russian church in the 15th century for "non-possessors" and "Josephites". The former linked the fate of the future with the ideology of hesychasm and its moral transformation, while the latter sought support in alliance with a strong secular power.

Searching for ‘success’: generation, gender and onward migration in the Iranian diaspora

2017 ◽  
Vol 14 (1) ◽  
pp. 101-112 ◽  
Author(s):  
Melissa Kelly
Keyword(s):  
Life History ◽  
Young Age ◽  
Onward Migration ◽  
Social Fields ◽  
Transnational Social Fields ◽  
High Level ◽  
Iranian Diaspora

This article uses the concepts of ‘transnational social fields’ and ‘habitus’ to explore the multifaceted role families play in shaping the aspirations of onward migrating youth. The article draws on biographical life history interviews conducted with the children of Iranian migrants who were raised in Sweden but moved to London, UK as adults. The findings of the study suggest that from a young age, all the participants were pressured by their parents to perform well academically, and to achieve high level careers. These goals were easier to achieve in London than in Sweden for several reasons. Interestingly, however, participants’ understandings of what constituted success and their motivations for onward migration were nuanced and varied considerably by gender. The study contributes to an understanding of the role of multi-sited transnational social fields in shaping the aspirations of migrant youths, as well as the strategies taken up by these migrants to achieve their goals.

Sign in / Sign up

Export Citation Format

Share Document