scholarly journals Northern distributional extensions of Peropteryx leucoptera and Peropteryx pallidoptera (Chiroptera: Emballonuridae) from Vichada, Colombia

2021 ◽  
Vol 7 (1) ◽  
pp. 192
Author(s):  
Miguel E. Rodríguez-Posada ◽  
Camilo Fernández-Rodríguez ◽  
Polidoro Sandoval
Keyword(s):  
The Other ◽  
Northern Limit ◽  
Distributional Range ◽  
Neotropical Bats ◽  
Riparian Corridor

The White-winged Dog-like Bat (Peropteryx leucoptera) and the Pale-winged Dog-like Bat (Peropteryx pallidoptera) are distinguished from the other emballonurid bats because they have white or translucent wings. Their distribution and biology are poorly known due to they are no captured in traditional bat inventories using mist nets. In this contribution, we extend the known distribution of P. leucoptera 260 km NE and P. pallidoptera 290 km NE. Our records are from three specimens collected in a mammal assessment at the riparian corridor of the river Meta in the Vichada department. This locality is the northern limit of the distributional range of both species. We highlight the need to continue the fieldwork on mammals inventories with specimen collections through the Colombian Llanos. We call attention to the importance of horizontal rotten logs as roost of P. leucoptera and other little known neotropical bats.

scholarly journals Les tourbières réticulées du Québec-Labrador subarctique : interprétation morphoclimatique

2005 ◽  
Vol 2 (3) ◽  
pp. 87-106 ◽  
Author(s):  
Louis-Edmond Hamelin
Keyword(s):  
Great Depth ◽  
The Other ◽  
Cold Period ◽  
Peat Bogs ◽  
Optimum Thickness ◽  
Northern Limit ◽  
Southern Limit ◽  
Geological Age ◽  
Concentric Pattern ◽  
Poor Drainage

In order to indicate the trend of his research, the author first reviews sortie books and articles that deal with similar problems. Then he carefully describes the string-bogs which are essentially a marshy zone formed of ponds separated by strips of vegetation. String-bogs present a rectilinear or a concentric pattern. Their characteristics make them different from other types of peat bogs. String-bogs are found in the Québec-Labrador peninsula inside a zone of which the Southern limit is the 50 th parallel and the Northern limit is approximately the 55 th parallel. The author's objective is to determine the morphoclimatic significance of that phenomenon. This type of string-bogs is usually found in areas of poor drainage ; it is also related to an optimum thickness of peat ; we find it jar South of the perma-frost limit in a region where snow maintains a great depth. It is a recent phenomenon though not necessarily contemporary; it dates from the cold period immediately preceding the present geological age. In order to explain the formation of string-bogs, the author envisions a combination of processes in which either one or the other can dominate locally. The processes are sub-aquatic solifluction, the gathering of isolated vegetation covered hillocks, the tearing of the plant covering by internal balls of ice, the shifting of a material as malleable as peat, the differential formation of ice in the ponds and the action of snow. These string-bogs do not form a part of « normal » geomorphology.

scholarly journals Primer registro del zorrillo manchado del sur spilogale angustifrons howell 1902 para el estado de Campeche, México

2007 ◽  
Vol 23 (1) ◽  
Author(s):  
Diego Humberto Martínez-Kú ◽  
Griselda Escalona-Segura ◽  
Jorge A. Vargas-Contreras
Keyword(s):  
First Record ◽  
The Other ◽  
The Road ◽  
Distributional Range ◽  
Mexican State ◽  
On The Road ◽  
Archeological Site

We found two roadside-killed individuals of Southern Spotted Skunk Spilogale angustifrons in the Calakmul region Campeche, Mexico (one, on the road Dziblachén-Xpujil, and the other, on the road to Calakmul archeological site). This information represents the first record for this species in this Mexican state and the extension of its distributional range.

Phenology and temperature tolerance of the red algae Chondria baileyana, Lomentaria baileyana, Griffithsia globifera, and Dasya baillouviana in Nova Scotia

1987 ◽  
Vol 65 (1) ◽  
pp. 57-62 ◽  
Author(s):  
I. Novaczek ◽  
C. J. Bird ◽  
J. McLachlan
Keyword(s):  
Nova Scotia ◽  
Population Size ◽  
Red Algae ◽  
Temperature Tolerance ◽  
Reproductive Period ◽  
The Other ◽  
Maximum Temperature ◽  
Cape Cod ◽  
Northern Limit ◽  
Warm Temperate

The warm-temperate species Chondria baileyana, Lomentaria baileyana, Griffithsia globifera, and Dasya baillouviana are restricted, north of Cape Cod on the eastern American coast, to embayments and estuaries. The northern limit of distribution is the southern Gulf of St. Lawrence. In culture, isolates of these species from Nova Scotia survived 28 to 34 °C. In the field all reproduced during the period of maximum temperature, and in G. globifera and C. baileyana the progeny also reproduced. Some of the progeny of D. baillouviana developed as cold- and heat-resistant pads that survived the winter, whereas the other three species died back to perennating holdfast structures. Lomentaria baileyana was the least successful of the group, being unable to form resistant holdfast pads in midsummer temperatures and having the most limited reproductive period and smallest population size.

Stromatoporoids from the Famennian (Devonian) Wabamun Formation, Normandville oilfield, north–central Alberta, Canada

1988 ◽  
Vol 62 (03) ◽  
pp. 411-419 ◽  
Author(s):  
Colin W. Stearn
Keyword(s):  
Patch Reef ◽  
Abundant Species ◽  
The Other ◽  
North Central ◽  
Biotic Crisis

Stromatoporoids are the principal framebuilding organisms in the patch reef that is part of the reservoir of the Normandville field. The reef is 10 m thick and 1.5 km2in area and demonstrates that stromatoporoids retained their ability to build reefal edifices into Famennian time despite the biotic crisis at the close of Frasnian time. The fauna is dominated by labechiids but includes three non-labechiid species. The most abundant species isStylostroma sinense(Dong) butLabechia palliseriStearn is also common. Both these species are highly variable and are described in terms of multiple phases that occur in a single skeleton. The other species described areClathrostromacf.C. jukkenseYavorsky,Gerronostromasp. (a columnar species), andStromatoporasp. The fauna belongs in Famennian/Strunian assemblage 2 as defined by Stearn et al. (1988).

D. The Line Spectrum of Pulsating Variable Stars

1967 ◽  
Vol 28 ◽  
pp. 207-244
Author(s):  
R. P. Kraft
Keyword(s):  
Variable Stars ◽  
The Other ◽  
Line Spectrum ◽  
Afternoon Session ◽  
Empirical Information ◽  
Pulsating Variable Stars ◽  
Almost Continuous ◽  
Informal Approach

(Ed. note:Encouraged by the success of the more informal approach in Christy's presentation, we tried an even more extreme experiment in this session, I-D. In essence, Kraft held the floor continuously all morning, and for the hour and a half afternoon session, serving as a combined Summary-Introductory speaker and a marathon-moderator of a running discussion on the line spectrum of cepheids. There was almost continuous interruption of his presentation; and most points raised from the floor were followed through in detail, no matter how digressive to the main presentation. This approach turned out to be much too extreme. It is wearing on the speaker, and the other members of the symposium feel more like an audience and less like participants in a dissective discussion. Because Kraft presented a compendious collection of empirical information, and, based on it, an exceedingly novel series of suggestions on the cepheid problem, these defects were probably aggravated by the first and alleviated by the second. I am much indebted to Kraft for working with me on a preliminary editing, to try to delete the side-excursions and to retain coherence about the main points. As usual, however, all responsibility for defects in final editing is wholly my own.)

C. The Continuous Spectrum of Pulsating Variable Stars

1967 ◽  
Vol 28 ◽  
pp. 177-206
Author(s):  
J. B. Oke ◽  
C. A. Whitney
Keyword(s):  
Continuous Spectrum ◽  
Variable Stars ◽  
Velocity Fields ◽  
The Other ◽  
Line Spectrum ◽  
Direct Information ◽  
Thermodynamic Structure ◽  
Diagnostic Interpretation ◽  
Pulsating Variable Stars ◽  
The Continuum

Pecker:The topic to be considered today is the continuous spectrum of certain stars, whose variability we attribute to a pulsation of some part of their structure. Obviously, this continuous spectrum provides a test of the pulsation theory to the extent that the continuum is completely and accurately observed and that we can analyse it to infer the structure of the star producing it. The continuum is one of the two possible spectral observations; the other is the line spectrum. It is obvious that from studies of the continuum alone, we obtain no direct information on the velocity fields in the star. We obtain information only on the thermodynamic structure of the photospheric layers of these stars–the photospheric layers being defined as those from which the observed continuum directly arises. So the problems arising in a study of the continuum are of two general kinds: completeness of observation, and adequacy of diagnostic interpretation. I will make a few comments on these, then turn the meeting over to Oke and Whitney.

Observing programme for the 24-inch/36-inch Schmidt telescope

1966 ◽  
Vol 24 ◽  
pp. 337
Author(s):  
W. Iwanowska
Keyword(s):  
The Other ◽  
Schmidt Telescope ◽  
Flint Glass

A new 24-inch/36-inch//3 Schmidt telescope, made by C. Zeiss, Jena, has been installed since 30 August 1962, at the N. Copernicus University Observatory in Toruń. It is equipped with two objective prisms, used separately, one of crown the other of flint glass, each of 5° refracting angle, giving dispersions of 560Å/mm and 250Å/ mm respectively.

A hard choice for Tomasello

2020 ◽  
Vol 43 ◽  
Author(s):  
Philip Pettit
Keyword(s):  
Joint Action ◽  
The Other ◽  
Hard Choice ◽  
Margaret Gilbert ◽  
Michael Bratman ◽  
Human Sense ◽  
Sense Of Obligation

Abstract Michael Tomasello explains the human sense of obligation by the role it plays in negotiating practices of acting jointly and the commitments they underwrite. He draws in his work on two models of joint action, one from Michael Bratman, the other from Margaret Gilbert. But Bratman's makes the explanation too difficult to succeed, and Gilbert's makes it too easy.

A study of cometary eruptions through OH radio-lines

1999 ◽  
Vol 173 ◽  
pp. 249-254
Author(s):  
A.M. Silva ◽  
R.D. Miró
Keyword(s):  
Short Duration ◽  
Growth Curves ◽  
The Other ◽  
Initial Mass ◽  
Radio Lines ◽  
Other Hand ◽  
Sudden Rise

AbstractWe have developed a model for theH2OandOHevolution in a comet outburst, assuming that together with the gas, a distribution of icy grains is ejected. With an initial mass of icy grains of 108kg released, theH2OandOHproductions are increased up to a factor two, and the growth curves change drastically in the first two days. The model is applied to eruptions detected in theOHradio monitorings and fits well with the slow variations in the flux. On the other hand, several events of short duration appear, consisting of a sudden rise ofOHflux, followed by a sudden decay on the second day. These apparent short bursts are frequently found as precursors of a more durable eruption. We suggest that both of them are part of a unique eruption, and that the sudden decay is due to collisions that de-excite theOHmaser, when it reaches the Cometopause region located at 1.35 × 105kmfrom the nucleus.

Note on Selection of Coordinate Systems for Geodynamics

1975 ◽  
Vol 26 ◽  
pp. 395-407
Author(s):  
S. Henriksen
Keyword(s):  
Sea Level ◽  
The Other ◽  
Coordinate Systems ◽  
Mean Sea Level ◽  
The Earth ◽  
The One ◽  
Static Systems ◽  
Selection Of

The first question to be answered, in seeking coordinate systems for geodynamics, is: what is geodynamics? The answer is, of course, that geodynamics is that part of geophysics which is concerned with movements of the Earth, as opposed to geostatics which is the physics of the stationary Earth. But as far as we know, there is no stationary Earth – epur sic monere. So geodynamics is actually coextensive with geophysics, and coordinate systems suitable for the one should be suitable for the other. At the present time, there are not many coordinate systems, if any, that can be identified with a static Earth. Certainly the only coordinate of aeronomic (atmospheric) interest is the height, and this is usually either as geodynamic height or as pressure. In oceanology, the most important coordinate is depth, and this, like heights in the atmosphere, is expressed as metric depth from mean sea level, as geodynamic depth, or as pressure. Only for the earth do we find “static” systems in use, ana even here there is real question as to whether the systems are dynamic or static. So it would seem that our answer to the question, of what kind, of coordinate systems are we seeking, must be that we are looking for the same systems as are used in geophysics, and these systems are dynamic in nature already – that is, their definition involvestime.

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