Natural Boundaries I: Theory

2008 ◽  
pp. 121-153
Keyword(s):  
Natural Boundaries

scholarly journals Short- and long-term movement patterns of six temperate reef fishes (Families Labridae and Monacanthidae)

1995 ◽  
Vol 46 (5) ◽  
pp. 853 ◽  
Author(s):  
NS Barrett
Keyword(s):  
Natural Habitat ◽  
Movement Patterns ◽  
Reef Fishes ◽  
Long Term Results ◽  
Home Ranges ◽  
Temperate Reef ◽  
Effective Deterrent ◽  
Short And Long Term ◽  
Natural Boundaries

Movement patterns were studied on a 1-ha isolated reef surrounding Arch Rock in southern Tasmania. Short-term movements were identified from diver observations, and interpretation of long-term movements involved multiple recaptures of tagged individuals. Visual observations indicated that the sex-changing labrids Notolabrus tetricus, Pictilabrus laticlavius and Pseudolabrus psittaculus were all site-attached, with females having overlapping home ranges and males being territorial. In the non-sex-changing labrid Notolabrus fucicola and in the monacanthids Penicipelta vittiger and Meuschenia australis, there was no evidence of territorial behaviour and 1-h movements were in excess of the scale of the study. The long-term results indicated that all species were permanent reef residents, with most individuals of all species except M. australis always being recaptured within a home range of 100 m × 25 m or less. Only 15% of individuals of M. australis were always recaptured within this range category. The natural habitat boundary of open sand between the Arch Rock reef and adjacent reefs appeared to be an effective deterrent to emigration. The use of natural boundaries should be an important consideration in the design of marine reserves where the aim is to minimize the loss of protected species to adjacent fished areas.

Standard map at complex rotation numbers: Creation of natural boundaries

1992 ◽  
Vol 68 (10) ◽  
pp. 1443-1446 ◽  
Author(s):  
A. Berretti ◽  
S. Marmi
Keyword(s):  
Standard Map ◽  
Complex Rotation ◽  
Rotation Numbers ◽  
Natural Boundaries

Physiological-biotechnological aspects of drought resistance of narrow-leaved lavender (Lavandula angustifolia mill.)

2021 ◽  
Vol 12 (3) ◽  
Author(s):  
O Klyachenko ◽  
◽  
I Shliakhtun ◽  
Keyword(s):  
Aquatic Vegetation ◽  
Left Bank ◽  
Small Areas ◽  
Code Of Phytosociological Nomenclature ◽  
Higher Aquatic Vegetation ◽  
Nature Park ◽  
Original Field ◽  
Natural Boundaries ◽  
Phytosociological Nomenclature ◽  
Coenotic Diversity

National Nature Park “Pyryatynsky” is a valuable reserve of flora and vegetation of the Left-Bank Dnipro. The extensive hydrological network of the Udai River and the wide representation within this nature reserve of floodplain reservoirs are the reason for the high diversity of plant communities of higher aquatic vegetation. In this article we classified the communities of order Callitricho-Batrachietalia in National nature park "Pyryatynskyi" and identify the features of their syntaxonomic and ecological differentiation. Fragmentary and non-comlete information about this type of vegetation are existed in literature, however, without geobotanical releves and detailed characteristics of the structure of phytoceonoses, synecology and synchorology. All obtained results based on original field data. In total, 22 geobotanical releves were performed during the period 2010–2017. The description of communities was carried out within their natural boundaries. Treatment of fitosociological data was performed with the JUICE software package. The nomenclature of syntaxons was consistent with the International Code of Phytosociological Nomenclature (ICFN).The order of Callitricho-Batrachietalia on the territory of NPP "Pyriatynsky" is represented by alliance Batrachion aquatilis Gehu 1961 and 4 associations (Batrachietum aquatilis Gehu 1961, Potameto perfoliati–Batrachietum circinati Sauer 1937, Hottonietum palustris Sauer 1947, Veronico beccabungae–Callitrichetum stagnalis (Oberdorfer 1957) Th. Müller 1962). This is first prodrome of order Callitricho-Batrachietalia for territory of National Nature Park “Pyryatynskyi”. The communities of this syntaxon occupy small areas and have a limited distribution in the region. Most of them are rare and vulnerable to changes in environmental conditions. Monitoring of their structure, chorology and dynamics is an important task to maintain and preserve the species and coenotic diversity of NPP "Pyryatynsky".

scholarly journals The isotherm map of eastern Serbia

2005 ◽  
Vol 85 (1) ◽  
pp. 31-38 ◽  
Author(s):  
Nenad Zivkovic ◽  
Sanja Smiljanic
Keyword(s):  
Temperature Gradients ◽  
Regression Analyses ◽  
Natural Boundaries

In this paper is shown an attempt of creating annual isothermal map of eastern Serbia in conditions where appropriate number of stations is not available, especially on the higher altitudes. According to the natural boundaries are formed 15 regions, with profiles that consist from one lower and one higher station. Because of area dimension it was necessary to use as referent points like some mountain picks for which temperatures were created projections according to the distant profiles. Comparing results of temperature gradients with same results obtained by regression analyses, we can make a conclusion that our method has validity in the sense of more precise prognosis of temperature for the smaller areas.

scholarly journals Landscape structure of coastal cliffs of the Black Sea coast of the Caucasus

2019 ◽  
Vol 27 (4) ◽  
pp. 298-306 ◽  
Author(s):  
Anna M. Aleynikova ◽  
Oksana N. Lipka ◽  
Marina V. Krylenko
Keyword(s):  
Black Sea ◽  
Landscape Structure ◽  
The Black Sea ◽  
The Caucasus ◽  
Vegetation Growth ◽  
Black Sea Coast ◽  
Coastal Landscapes ◽  
Coastal Cliffs ◽  
Natural Boundaries ◽  
Sea Coast

This work is devoted to the analysis of the landscape structure of the coastal cliffs of the Black Sea coast of the Caucasus. The paper analyzes the features of vegetation growth and the landscape structure of the cliffs of the Tuaphat massif, proposes and substantiates the classification of landscapes of coastal cliffs, reveals the features of coastal landscapes. In the landscape structure of the coastal cliffs of the Tuaphat massif, natural boundaries can be distinguished by: the nature of the apparent occurrence of geological layers; substates by the steepness of the slope; striae, which are characterized by more abundant growth of vegetation along cracks in the geological layer; facies usually coincide geographically with nanoand microforms of the relief and are usually represented by one type of vegetation (for example, a pillow rock form). The distribution of vegetation by striae on fine crushed stone of siltstone or mudstone, the absence of halophytes, but the predominance of salt-tolerant plant species with a wide ecological amplitude (petrophytes, cosmopolitans and ruderal) are typical.

scholarly journals Sticky Thermals: Evidence for a Dominant Balance between Buoyancy and Drag in Cloud Updrafts

2015 ◽  
Vol 72 (8) ◽  
pp. 2890-2901 ◽  
Author(s):  
David M. Romps ◽  
Alexander B. Charn
Keyword(s):  
Large Eddy Simulation ◽  
Practical Interest ◽  
Momentum Equation ◽  
Severe Weather ◽  
Convective Clouds ◽  
Eddy Simulation ◽  
Large Eddy ◽  
Great Practical Interest ◽  
Natural Boundaries ◽  
Drag Law

Abstract The vertical velocities of convective clouds are of great practical interest because of their influence on many phenomena, including severe weather and stratospheric moistening. However, the magnitudes of forces giving rise to these vertical velocities are poorly understood, and the dominant balance is in dispute. Here, an algorithm is used to extract thousands of cloud thermals from a large-eddy simulation of deep and tropical maritime convection. Using a streamfunction to define natural boundaries for these thermals, the dominant balance in the vertical momentum equation is revealed. Cloud thermals rise with a nearly constant speed determined by their buoyancy and the standard drag law with a drag coefficient of 0.6. Contrary to suggestions that cloud thermals might be slippery, with a dominant balance between buoyancy and acceleration, cloud thermals are found here to be sticky, with a dominant balance between buoyancy and drag.

First-passage-time densities for time-non-homogeneous diffusion processes

1997 ◽  
Vol 34 (3) ◽  
pp. 623-631 ◽  
Author(s):  
R. Gutiérrez ◽  
L. M. Ricciardi ◽  
P. Román ◽  
F. Torres
Keyword(s):  
Diffusion Processes ◽  
First Passage Time ◽  
Passage Time ◽  
Continuous Functions ◽  
Probability Density Functions ◽  
Density Functions ◽  
First Passage ◽  
One Dimensional ◽  
Dimensional Diffusion ◽  
Natural Boundaries

In this paper we study a Volterra integral equation of the second kind, including two arbitrary continuous functions, in order to determine first-passage-time probability density functions through time-dependent boundaries for time-non-homogeneous one-dimensional diffusion processes with natural boundaries. These results generalize those which were obtained for time-homogeneous diffusion processes by Giorno et al. [3], and for some particular classes of time-non-homogeneous diffusion processes by Gutiérrez et al. [4], [5].

The Boogie in the Bush

2019 ◽  
pp. 103-116
Author(s):  
Christin Marie Taylor
Keyword(s):  
African American ◽  
Native American ◽  
Jim Crow ◽  
Essential Aspect ◽  
Outdoor Space ◽  
Natural Boundaries

This essay considers Welty’s engagement with race through the lenses of nature and space. Through seemingly insignificant references to manmade outdoor space, Welty points to nature as an essential aspect of race making. Natural boundaries come to symbolize the separations of Jim Crow as well as associated iterations of the “black beast rapist” myth that include tropes of “oriental” and Native American masculine others. But, Welty’s African American characters overturn these dominant myths, signifying on white masculine violence and feminine desire.

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