Heterochrony and Frogs: The Relationship of a Life History Trait to Morphological Form

1986 ◽  
Vol 127 (2) ◽  
pp. 167-183 ◽  
Author(s):  
Sharon B. Emerson
Keyword(s):  
Life History ◽  
Life History Trait ◽  
Morphological Form ◽  
Relationship Of ◽  
The Relationship

Taxonomic studies on Archigetes Leuckart, 1878 (Cestoda: Caryophyllaeidae)

Parasitology ◽  
1965 ◽  
Vol 55 (3) ◽  
pp. 439-451 ◽  
Author(s):  
C. R. Keneedy
Keyword(s):  
Life History ◽  
Experimental Work ◽  
Nature Conservancy ◽  
The Family ◽  
Single Genus ◽  
Biological Characters ◽  
Taxonomic Studies ◽  
Relationship Of ◽  
Recent Experimental Work ◽  
The Relationship

Recent experimental work has indicated that species of Archigetes are capable of infecting and maturing in fishes in addition to tubificids.The genus Archigetes is re-defined on the basis of morphological and biological characters, with particular emphasis on recent life history studies. All species capable of neotenic development have been re-united in a single genus.A description of all species of Archigetes together with a key for their identification are included. New synonomies are discussed.The relationship of Archigetes to other genera of the family is briefly considered, and it is concluded that it forms the terminal stage in a series showing the attainment of neotenic development.I wish to thank Professor R. J. Pumphrey in whose Department the work was carried out, and Dr J. C. Chubb for advice and help in the preparation of this manuscript. I am also grateful to Professor K. Berg and Dr R. L. Calentine for the loan of specimens. The work was carried out during the tenure of a Nature Conservancy Research Studentship.

SOME NEW NORTH AMERICAN GENERA AND SPECIES IN THE GROUP FORMERLY CALLED PLATYMETOPIUS (RHYNCHOTA, HOMOPTERA)

1931 ◽  
Vol 63 (9) ◽  
pp. 216-222
Author(s):  
E. D. Ball
Keyword(s):  
Life History ◽  
New Species ◽  
Single Species ◽  
Food Plant ◽  
Food Plants ◽  
History Information ◽  
Related Group ◽  
Relationship Of ◽  
The Relationship ◽  
Working Out

The writer has been working on the food plants of the leaf-hoppers for many years and has found in the main the different species of the genus Platymetopius, as commonly recognized, are very closely confined to a single species of plant or to a closely related group. Before it was possible to prepare a list of the food plants in the group it was found necessary to describe a number of new species of which food plant and life history information was available. In working out the relationship of these species, two startling discoveries were made.

The Relationship of Form and Function of Minute Characters of Lepidopterous Larvae, and its Importance in Life-History Studies

1964 ◽  
Vol 96 (7) ◽  
pp. 991-1004 ◽  
Author(s):  
Margaret Rae MacKay
Keyword(s):  
Life History ◽  
Chemical Control ◽  
Life Histories ◽  
The Other ◽  
Taxonomic Study ◽  
Form And Function ◽  
Morphological Studies ◽  
And Function ◽  
Relationship Of ◽  
The Relationship

AbstractThe information to be obtained from thorough life-history studies is an extremely useful tool, perhaps especially so when ecology is being emphasized, as it is to-day, by the life-table and other mathematical approaches to the study of population processes. This information is desired by workers in many fields of entomology – by the biological and chemical control experts, the biomathematicians, the theorists and even the taxonomists. However, much of the knowledge that these workers require, for instance the fine distinctions of behaviour and environment, has been overlooked in most life-history studies, and I strongly suspect that one of the weaknesses of studies of this nature has been the failure to analyse the mode of living of an insect (or, in the case of Lepidoptera, of the immature forms) in relation to the anatomy on one hand and environmental circumstances on the other. To look for these relationships, I believe that one requires (a) the ability and perseverance to perceive detail as minute as that required for a taxonomic study, and (b) a considerable knowledge of the taxonomic detail that is to be obtained from basic morphological studies. Therefore, in this paper, attention is drawn to pertinent structural characters of lepidopterous larvae and their probable connection with the behaviour and microhabitats of the larvae, in the hope that some guidance may be offered to future students of life-histories, at least in Lepidoptera.

A Preliminary Consideration of the Taxonomic Position of Palmaria Palmata (Linnaeus) Stackhouse = Rhodymenia Palmata (Linnaeus) Greville

1974 ◽  
Vol 54 (3) ◽  
pp. 509-528 ◽  
Author(s):  
M. D. Guiry
Keyword(s):  
Life History ◽  
Northern Hemisphere ◽  
Red Algae ◽  
The Other ◽  
Taxonomic Position ◽  
Palmaria Palmata ◽  
Relationship Of ◽  
The Relationship ◽  
Preliminary Consideration

The life history and taxonomic position of Rhodymenia palmata (Linnaeus) Greville, one of the commonest red algae in the northern hemisphere, have been a source of considerable speculation. Carpogonial plants and carposporangial plants are unknown although tetrasporangial plants are common and spermatangial plants have been reported on numerous occasions. A parallel situation occurs in the genus Halosaccion Kützing for which carpogonial and carposporangial plants have never been recorded and spermatangial plants are well known only in the species Halosaccion ramentaceum (Linnaeus) J. G. Agardh. It is proposed in this paper to consider the relationship of Rhodymenia palmata to the other genera of the Rhodymeniaceae (Rhodymeniales) particularly Halosaccion and Leptosarca Gepp & Gepp.

scholarly journals Образ „гордой полячки” в пьесе Леонида Зорина „Варшавская мелодия”

2018 ◽  
pp. 111-122
Author(s):  
Natalia Popovich
Keyword(s):  
Life History ◽  
Life Experience ◽  
Russian Literature ◽  
Main Character ◽  
History Of ◽  
Strong Woman ◽  
Relationship Of ◽  
The Relationship

Helena is the main character of this play and she is the author’s porte parole.This character develops stereotype of „a proud Polish woman” and continues the19th century plot in Russian literature (the relationship of a strong woman and a weakman). The main character’s features are: sacrifice, ability to love and forgive, will to fight for personal matters. In Warsaw melody we can see that love and social themes are bound together — the conflict is not between person, but a man and the country. A Polish woman is a symbol of higher culture, she wants to overcome fear of what happens tomorrow, that is induced by her WWII life history, and gains life experience due to herpossibility to analyze and summarize. In the text we can find the author’s allusionsto the tragic history of Poland during WWII.

Human life history

2015 ◽  
pp. 75-93
Author(s):  
Martin Brüne
Keyword(s):  
Life History ◽  
Parental Investment ◽  
Attachment Styles ◽  
Developmental Trajectories ◽  
Human Life ◽  
Life History Strategy ◽  
Human Infants ◽  
Relationship Of ◽  
The Relationship ◽  
Adaptive Role

Human life-history patterns are characterized by slow maturation, long parental dependency, longevity, and low number of offspring. These developmental peculiarities determine the amount of parental investment in offspring and mating effort, and assign an adaptive role to postmenopausal women. Hence evolution has produced specific adaptations pertaining to the relationship of human infants with their primary caregivers, subsumed under the term ‘attachment’. The way attachment patterns or ‘styles’ develop during early infancy coin the child’s view of the world in terms of the emotional availability and trustworthiness of others. Harsh environmental conditions during infancy promote insecure attachment styles and a ‘faster’ life-history strategy, including earlier sexual maturation and sexual activity and less parental investment in own offspring. The opposite is more likely to emerge when children grow up in secure conditions with responsive and emotionally available caregivers. These developmental trajectories have profound implications for social interaction and stress-regulation abilities.

The relationship of the scleractinian corals to the rugose corals

Paleobiology ◽  
1980 ◽  
Vol 6 (02) ◽  
pp. 146-160 ◽  
Author(s):  
William A. Oliver
Keyword(s):  
Critical Points ◽  
Scleractinian Corals ◽  
Convincing Evidence ◽  
Early Triassic ◽  
Rugose Corals ◽  
History Of ◽  
The Subject ◽  
Relationship Of ◽  
The Relationship ◽  
Biologic Factors

The Mesozoic-Cenozoic coral Order Scleractinia has been suggested to have originated or evolved (1) by direct descent from the Paleozoic Order Rugosa or (2) by the development of a skeleton in members of one of the anemone groups that probably have existed throughout Phanerozoic time. In spite of much work on the subject, advocates of the direct descent hypothesis have failed to find convincing evidence of this relationship. Critical points are:(1) Rugosan septal insertion is serial; Scleractinian insertion is cyclic; no intermediate stages have been demonstrated. Apparent intermediates are Scleractinia having bilateral cyclic insertion or teratological Rugosa.(2) There is convincing evidence that the skeletons of many Rugosa were calcitic and none are known to be or to have been aragonitic. In contrast, the skeletons of all living Scleractinia are aragonitic and there is evidence that fossil Scleractinia were aragonitic also. The mineralogic difference is almost certainly due to intrinsic biologic factors.(3) No early Triassic corals of either group are known. This fact is not compelling (by itself) but is important in connection with points 1 and 2, because, given direct descent, both changes took place during this only stage in the history of the two groups in which there are no known corals.

Skeletal elements of crinoid echinoderms: High-resolution structural and microanalytical results

1983 ◽  
Vol 41 ◽  
pp. 194-195
Author(s):  
D. F. Blake ◽  
L. F. Allard ◽  
D. R. Peacor
Keyword(s):  
High Resolution ◽  
Marine Invertebrates ◽  
Sea Urchins ◽  
Structural Features ◽  
Sea Stars ◽  
High Resolution Tem ◽  
Relationship Of ◽  
The Relationship ◽  
Insight Into

Echinodermata is a phylum of marine invertebrates which has been extant since Cambrian time (c.a. 500 m.y. before the present). Modern examples of echinoderms include sea urchins, sea stars, and sea lilies (crinoids). The endoskeletons of echinoderms are composed of plates or ossicles (Fig. 1) which are with few exceptions, porous, single crystals of high-magnesian calcite. Despite their single crystal nature, fracture surfaces do not exhibit the near-perfect {10.4} cleavage characteristic of inorganic calcite. This paradoxical mix of biogenic and inorganic features has prompted much recent work on echinoderm skeletal crystallography. Furthermore, fossil echinoderm hard parts comprise a volumetrically significant portion of some marine limestones sequences. The ultrastructural and microchemical characterization of modern skeletal material should lend insight into: 1). The nature of the biogenic processes involved, for example, the relationship of Mg heterogeneity to morphological and structural features in modern echinoderm material, and 2). The nature of the diagenetic changes undergone by their ancient, fossilized counterparts. In this study, high resolution TEM (HRTEM), high voltage TEM (HVTEM), and STEM microanalysis are used to characterize tha ultrastructural and microchemical composition of skeletal elements of the modern crinoid Neocrinus blakei.

Studies on Leukemogenic and Sarcomagenic Viruses

1970 ◽  
Vol 28 ◽  
pp. 156-157
Author(s):  
Leon Dmochowski
Keyword(s):  
Electron Microscopy ◽  
Electron Microscope ◽  
Morphological Properties ◽  
Mode Of Development ◽  
Relationship Of ◽  
The Relationship

Electron microscopy has proved to be an invaluable discipline in studies on the relationship of viruses to the origin of leukemia, sarcoma, and other types of tumors in animals and man. The successful cell-free transmission of leukemia and sarcoma in mice, rats, hamsters, and cats, interpreted as due to a virus or viruses, was proved to be due to a virus on the basis of electron microscope studies. These studies demonstrated that all the types of neoplasia in animals of the species examined are produced by a virus of certain characteristic morphological properties similar, if not identical, in the mode of development in all types of neoplasia in animals, as shown in Fig. 1.

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