Fossil seed cones of Fokienia (Cupressaceae) from the Paleocene Ravenscrag Formation of Saskatchewan, Canada

1990 ◽  
Vol 68 (7) ◽  
pp. 1609-1618 ◽  
Author(s):  
E. E. McIver ◽  
J. F. Basinger
Keyword(s):  
Key Words ◽  
Leaf Morphology ◽  
Branching Pattern ◽  
Cone Structure ◽  
The Past ◽  
Fossil Remains ◽  
Seed Cone ◽  
Early Paleocene ◽  
Mosaic Evolution ◽  
Branch Morphology

Foliage bearing seed cones that are remarkably similar to those of extant Fokienia (Cupressaceae) have been recovered from early Paleocene sediments of the Ravenscrag Formation, southwestern Saskatchewan, Canada. The cones are borne in opposite pairs, are about 12.0 mm long and 10.0 mm wide, with 8–10 woody, decussate, peltate scales. Foliage branches oppositely and bears thin, flattened leaves in whorls of four. Although branching pattern and leaf morphology differ from that of modern Fokienia, similarity in seed cone structure allows assignment to this genus. These fossil remains indicate that cone structure comparable to modern Fokienia had evolved by the earliest Tertiary and has probably remained stable since. The vegetative remains indicate, however, that leaf and branch morphology has continued to evolve over this period of time (mosaic evolution), or that the diversity of morphological forms has in the past been greater in Fokienia and that extinction has limited this diversity. Such data reinforce the principle that seed cone structure should be the basis for identification of fossil Cupressaceae remains. Key words: Fokienia, Cupressaceae, Paleocene, fossil, seed cones, evolution.

Mesocyparis borealis gen. et sp. nov.: fossil Cupressaceae from the early Tertiary of Saskatchewan, Canada

1987 ◽  
Vol 65 (11) ◽  
pp. 2338-2351 ◽  
Author(s):  
E. E. McIver ◽  
J. F. Basinger
Keyword(s):  
Northern Hemisphere ◽  
Branching Pattern ◽  
Natural Group ◽  
Classification Schemes ◽  
Cone Structure ◽  
Reproductive Morphology ◽  
Extant Genus ◽  
Early Tertiary ◽  
Seed Cone ◽  
First Time

Fossil cedar foliage of the Cupressinocladus interruptus type, with associated seeds and cones, is locally abundant in Paleocene deposits of the Ravenscrag Formation, southwestern Saskatchewan, Canada. Vegetative remains of this type occur frequently in early Tertiary plant assemblages throughout the northern hemisphere, indicating that this now extinct cedar was once widespread. For the first time this cedar can be described on the basis of both vegetative and reproductive morphology. Foliage is frond-like with a characteristic opposite branching pattern. Seed cones are globose and woody and bear four equal and decussate scales with prominent umbos. Seeds bear large, equal, semicircular wings. The fossil cedar appears most closely related to extant Cupressaceae such as Thuja, Chamaecyparis, and Heyderia. Foliage closely resembles that of Thuja, while cones are most similar to those of Chamaecyparis. The fossil differs sufficiently in foliage and seed cone structure to preclude assignment to an extant genus and is here assigned to Mesocyparis borealis gen. et sp. nov. Similarities among such extant genera as Thuja, Chamaecyparis, Heyderia, and Thujopsis and the fossil Mesocyparis borealis suggest that all may belong to a single natural group. Furthermore, this group may be more closely related to the southern hemispheric genera Libocedrus, Papuacedrus, and Austrocedrus than present classification schemes imply. Our examination of the Cupressaceae indicates that a revision of present systems of classification is required to accommodate evidence from both extant and extinct cedars.

La olla, la fuente y el plato. Distintas maneras de compartir en Argentina

STUDIUM ◽  
2018 ◽  
pp. 189-208
Author(s):  
Patricia Aguirre
Keyword(s):  
Key Words ◽  
Income Share ◽  
The Past ◽  
Palabras Clave

El siguiente artículo ejemplifica con tres elementos del servicio de mesa (la olla, la fuente y el plato) las formas características en que se despliega la comensalidad en diferentes sectores de ingresos, sexos y edades, en Argentina. Diferencia las prácticas, los actores y los sentidos ligados al repartir y al compartir, en cada sector, señalando que el reparto es una obligación ligada a las jerarquías mientras que compartir es una elección libre y afectuosa basada en la amistad y la confianza de la cual se espera reciprocidad. Se señala que tal como muestran el asado y el mate en el pasado, se puede compartir tanto con el alimento más prestigioso (la carne asada) como sin comida: en la ronda del mate. Palabras clave: Comensalidad, ingresos, compartir, repartir, representaciones   Abstract Through the pot, the platter and the dish —three objects used at meal times— this article exemplifies typical ways of commensality in Argentina, among groups whose income, sex, and age differ. The article points to the differences between practices, actors, and senses involved in distributing and sharing in each sector. It shows that distribution is an obligation related to hierarchy, whereas sharing is a free, loving decision based on trust and friendship and that reciprocity is expected. As shown by asado and mate in the past, it is possible to share regardless of what is being shared. In the example, asado stands for prestigious meat done on a charcoal grill, whereas the mate circle is not about food. Key words: commensality, income, share, distribute, representations

Predation by Sharks on the Grey Seal (Halichoerus grypus) in Eastern Canada

1983 ◽  
Vol 40 (3) ◽  
pp. 267-271 ◽  
Author(s):  
Paul Brodie ◽  
Brian Beck
Keyword(s):  
Key Words ◽  
Population Size ◽  
Halichoerus Grypus ◽  
Longline Fishery ◽  
Grey Seal ◽  
Eastern Canada ◽  
The Past ◽  
Harbour Seals ◽  
Commercially Important ◽  
Important Fish

The increase in population size of the grey seal (Halichoerus grypus) off eastern Canada over the past 20 yr may be attributed to a decrease in shark stocks, their supposed predators. Reduction of the shark population is presumed to have resulted from a directed longline fishery and, of greater significance, from a change in the fishery for swordfish (Xiphias gladius) from selective harpooning to pelagic longlining, which has produced a large bycatch of sharks. The resulting enhanced survival of grey seals is reflected in greater infestation of commercially important fish species by the codworm (Phocanema decipiens).Key words: grey seals, harbour seals, sharks, swordfish, codworm, predation, fisheries

Time and space problems in the text of epos

2020 ◽  
Vol 60 (11) ◽  
pp. 143-146
Author(s):  
Parvana Ismayil Pashayeva ◽  
Keyword(s):  
Key Words ◽  
Time Pass ◽  
Time And Space ◽  
Physical Time ◽  
The Past ◽  
The Future ◽  
Time Changes

The article deals with the problems of introducing of time, time changes and the time-place relations as well. Artistic time is distinguished by belonging of an artistic time to the past in the artistic text, and in epos texts as well. In such kinds of texts one can meet with the changing of situations and various forms of substitutions of grammatical time. Speech moment can be used in defining of criteria for the present, past and the future times in epos texts. And speech moment is being connected with the physical time. Grammatical time comes into effect as a result of time pass components of physical time changings of course. Key words: time, place, epos, artistic time, grammatical time

scholarly journals La historia militar: más allá de la descripción del acontecimiento. El ejemplo de la frontera luso-extremeña en el contexto de la Guerra de Sucesión de 1475

2018 ◽  
Vol 28 ◽  
pp. 259
Author(s):  
Carlos J. Rodríguez Casillas
Keyword(s):  
Key Words ◽  
Military History ◽  
The Past ◽  
Palabras Clave ◽  
The Social ◽  
Economic Foundations

Resumen: Aunque en las ultimas décadas la historia militar ha logrado evolucionar y diversificar sus objetivos de análisis, todavía son muchos los estudiosos que identifican esta disciplina con el estudio del armamento y la narración de las batallas. Por ello, el objetivo de este trabajo es poner de relieve la importancia que tiene la historia militar como herramienta de análisis con la que poder comprender los fundamentos sociales y económicos de una determinada época. Para ello, nos serviremos del estudio de las campanas que tuvieron lugar en la frontera castellano-portuguesa en el contexto de la Guerra de Sucesión de 1475.Palabras clave: Guerra, historia militar, historiografía.Abstract: Although military history has managed to develop and diversify its areas of analysis over the past few decades, there are still many researchers who identify this discipline with the study of weaponry and description of battles. The aim of this project is therefore to highlight the importance of military history as a tool for analysis, which can be used to understand the social and economic foundations of any given era. To bear this out, we analyse campaigns on the Castilian-Portuguese border during the War of Succession of 1475.Key words: War, military history, historiography.

scholarly journals KARAKTERISTIK AKAR BEREKTOMIKORIZA PADA Shorea pinanga, Pinus merkusii DAN Gnetum gnemon

PERENNIAL ◽  
2010 ◽  
Vol 6 (1) ◽  
pp. 11
Author(s):  
Melya Riniarti ◽  
Irdika Mansur ◽  
Arum Sekar Wulandari ◽  
Cecep Kusmana
Keyword(s):  
Key Words ◽  
Ectomycorrhizal Fungi ◽  
Host Plants ◽  
Clamp Connection ◽  
The Other ◽  
Branching Pattern ◽  
Root Tips ◽  
Hartig Net ◽  
Gnetum Gnemon ◽  
Pinus Merkusii

Morphology and anatomy characteristics often used to identify ectomycorrhizal fungi. We used three Scleroderma spp. (Scleroderma columnare, S. dictyosporum), and S. sinnamariense) and inoculated to Shorea pinanga, Pinus merkusii, and Gnetum gnemon. After 6,8, and 10 months, each root tips were collected to determined hyphae colour, branching pattern, clamp-connection, hartig net and mantle. This result revealed that S. sinnamariense did not form association with S. pinanga and P. merkusii but form association with G. gnemon. On the other hand, S. columnare and S. dictyosporum could form association with all the host plants. S. columnare and S. dictyosporum formed white hyphae while S. sinnamariense formed yellow hyphae with monopodial branching pattern. The depth of hartig net and mantle was increased by timed. Key words: ectomycorrhizal fungi, hartig net, mantle, Scleroderma

The tale of the headless turtle

Zootaxa ◽  
2016 ◽  
Vol 4200 (2) ◽  
pp. 327 ◽  
Author(s):  
PEDRO S. R. ROMANO
Keyword(s):  
New Species ◽  
Phenotypic Plasticity ◽  
Lower Cretaceous ◽  
Fossil Record ◽  
Diagnostic Features ◽  
Fossil Species ◽  
The Past ◽  
Early Paleocene ◽  
Phylogenetic Hypotheses ◽  
A New Species

Pelomedusoides is the most diverse clade of side-necked turtles and there is an extensive fossil record (de Broin, 1988; Lapparent de Broin, 2000; Gaffney et al., 2006, 2011) that dates back at least to the Barremian (Lower Cretaceous) (Romano et al., 2014). Its large fossil record evidences a greater diversity in the past, particularly at the end of the Mesozoic, and exhibits a good sampling of species that are represented by skull material (Gaffney et al., 2006, 2011). As a consequence, the most complete and recent phylogenetic hypotheses for this clade (e.g. Romano et al., 2014; Cadena, 2015) are based on matrices comprising a great amount of cranial characters derived largely from Gaffney et al. (2006, 2011). In addition, it is well established that shell characters show a lot of phenotypic plasticity, even in the fossil species (Romano, 2008; Gaffney et al., 2006, 2011). In most cases it consequently is not justified to rely on “diagnostic features” of poorly informative shell-only material for describing a new species. Because of that, most authors remark new morphotypes in the literature when such aberrant specimens are recovered, but do not make any nomenclatural act by proposing a new yet poorly supported species (e.g. Romano et al., 2013; Ferreira & Langer, 2013; Menegazzo et al., 2015). Unfortunately, such a supposedly new bothremydid turtle (Pleurodira: Bothremydidae) from the Early Paleocene of Brazil was recently described based on poorly diagnostic remains (Carvalho et al., 2016; hereafter CGB, for the authors initials) and a correction of this unfounded nomenclatural act is required. In addition I present some comments on shell only material from Brazil in order to guide splitter-taxonomists to stop describing poorly preserved fossil specimens as new species. 

Abitare Spina 3

2009 ◽  
pp. 61-70
Author(s):  
Cristina Bianchetti ◽  
Anna Todros
Keyword(s):  
Key Words ◽  
Steel Production ◽  
Transformation Process ◽  
Public And Private ◽  
The Past ◽  
The Common ◽  
The Relationship

- Spina 3 is the old district of Turin steel production, it is an area of more than 1 million square metres, which, over the past fifteen years, has gone through a transformation process that radically reversed the relationship between public and private properties, in favour of the first ones. The outcome appears to be a space where it was possible to play freely with its elements, but where, at the end, it was generated a hard space, where the tracks of the person who live there are struggling to settle. The house, built from the market so rigidly and traditionally, became a symbol of the common choice to live in the new Turin.Key words living, practices, friches, space appropriation, space scheme, commonality.Parole chiave: abitare, pratiche, friches, appropriazione (dello spazio), disegno (dello spazio), comunanza.

The pollination mechanism and development after bud burst of cones of Larix laricina

1991 ◽  
Vol 69 (6) ◽  
pp. 1179-1187 ◽  
Author(s):  
G. R. Powell ◽  
Kathleen J. Tosh
Keyword(s):  
Key Words ◽  
Seed Size ◽  
Larix Laricina ◽  
Bud Burst ◽  
Scale Growth ◽  
Pollination Mechanism ◽  
Seed Cone ◽  
Cone Development ◽  
Micropylar Canal ◽  
Pollen Cone

Pollen-cone and seed-cone development, from bud burst to maturity, was investigated on Larix laricina (Du Roi) K. Koch in three young plantations. The pollination mechanism was emphasized. Pollen cones grew rapidly to shed pollen, shrivelled, and remained on the trees for a year or more. Pollen was directed to the ovular regions by the bracts of the seed cones. Pollen adhered among papillae on the larger of two integument extensions. Degeneration of the centre of the papillate integument tip caused a collapse that drew pollen in as the papillate rim grew inward. This ingrowth was joined by that of the smaller integument extension, resulting in a sealed tubular structure that enclosed a dry micropylar canal. Pollen was held by the ingrown plug of degenerated tissue as the nucellus tip expanded into the base of the canal. As this occurred, the ovules, with or without pollination, grew to ultimate seed size, and the initially small ovuliferous scales overgrew the bracts. First bract, then ovuliferous-scale growth was associated with a double-sigmoid form of cone elongation. In mature cones the bracts decreased and the ovuliferous scales (except near the tip) increased in size acropetally. Key words: bract, integument, ovuliferous scale, pollen cone, seed cone, tamarack or eastern larch.

Using 137Cs to investigate net soil erosion at two soil benchmark sites in Quebec

1993 ◽  
Vol 73 (4) ◽  
pp. 515-526 ◽  
Author(s):  
Y. Z. Cao ◽  
D. R. Coote ◽  
C. Wang ◽  
M. C. Nolin
Keyword(s):  
Soil Erosion ◽  
Key Words ◽  
Soil Conservation ◽  
Soil Loss ◽  
Soil Samples ◽  
Grid Pattern ◽  
Erosion Rates ◽  
The Past ◽  
Soil Erosion Rates ◽  
Small Grains

137Cs in the soil was used to estimate soil erosion at two National Soil Conservation Program benchmark sites in the province of Quebec (sites 15-QU and 16-QU). The 137Cs baseline in an uneroded forest area was approximately 3100 Bq m−2. The 137Cs content at site 15-QU ranged from 1072 Bq m−2 to 6389 Bq m−2, while at site 16-QU it ranged from 663 Bq m−2 to 5444 Bq m−2. Computed net erosion over the past 30 yr at site 15-QU varied from a loss of 9.65 kg m−2 yr−1 to a gain of 10.88 kg m−2 yr−1 and at site 16-QU from a loss of 6.38 kg m−2 yr−1 to a gain of 1.73 kg m−2 yr−1. The average net erosion rates were 2.43 kg m−2 yr−1 at site 15-QU and 1.29 kg m−2 yr−1 at site 16-QU. Soil samples collected on a grid pattern indicated that 90% and 83% of the area at sites 15-QU and 16-QU, respectively, was subjected to net soil loss. A comparison of total 137Cs movement from eroded areas to depositional areas showed that 24.2% of 137Cs was lost from site 15-QU, while about 17.6% of 137Cs was lost from site 16-QU. Mapping of 137Cs content and calculated soil loss and deposition showed that soil erosion was closely related to topography.Under similar slope conditions, the soil erosion rates were 27–68% higher at site 15-QU than at site 16-QU. Higher tillage frequency and use of silage corn were the suggested reasons for the higher soil erosion rates at site 15-QU compared with site 16-QU, which had been used for hay and small grains. Key words: 137Cs, erosion, deposition, soil conservation

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