Clam storage in a Northwestern Crow (Corvus caurinus): dispersion and sequencing

1985 ◽  
Vol 63 (4) ◽  
pp. 857-860 ◽  
Author(s):  
Paul C. James ◽  
Nicolaas A. M. Verbeek
Keyword(s):  
Experimental Study ◽  
British Columbia ◽  
Nearest Neighbour ◽  
Recovery Sequence ◽  
Neighbour Distance ◽  
Corvus Caurinus ◽  
Northwestern Crow ◽  
Very High ◽  
Sequence Position ◽  
Made In

An experimental study of clam storage by a Northwestern Crow (Corvus caurinus) was carried out on Mitlenatch Island, British Columbia, Canada. The crow was trained to take clams from a feeding table. His dispersion of the clams was studied using nearest-neighbour distance (NND). The distance clams were carried and the sequence of storage and recovery was also quantified. Median NND was significantly correlated with storage sequence position, as was NND with distance carried. The crow tended to recover the clams in the same order as he stored them, as storage sequence position was significantly correlated with recovery sequence position. The results were compared with other spatiotemporal studies of avian food hoarding. Recovery success of the crow was very high, he appeared to use memory to relocate his caches, as the majority of them were made in new sites, and he never revisited those already emptied.

COOPERATIVE BREEDING OF THE NORTHWESTERN CROW CORVUS CAURINUS IN BRITISH COLUMBIA

Ibis ◽  
2008 ◽  
Vol 123 (2) ◽  
pp. 183-189 ◽  
Author(s):  
Nicolaas A. M. Verbeek ◽  
Robert W. Butler
Keyword(s):  
British Columbia ◽  
Cooperative Breeding ◽  
Corvus Caurinus ◽  
Northwestern Crow

Natal pterylosis of the northwestern crow, Corvus caurinus

1991 ◽  
Vol 69 (6) ◽  
pp. 1534-1537 ◽  
Author(s):  
Nicolaas A. M. Verbeek
Keyword(s):  
British Columbia ◽  
The Body ◽  
Strait Of Georgia ◽  
Corvus Caurinus ◽  
Northwestern Crow

The number of natal down feathers (neossoptiles) and their arrangement in specific feather tracts of the body (pterylosis) are given for 19 nestlings of the northwestern crow, Corvus caurinus, from the Strait of Georgia, British Columbia. The natal pterylosis of the northwestern crow is compared with that of other members of the genus Corvus in the Nearctic and Palearctic regions. This comparison points out several differences in the capital, abdominal, and caudal tracts within the genus.

ELASTIC PROPERTIES OF STRAINED FCC AND HCP IRON

1993 ◽  
Vol 07 (01n03) ◽  
pp. 207-211
Author(s):  
T. KRAFT ◽  
M. METHFESSEL ◽  
M. VAN SCHILFGAARDE ◽  
M. SCHEFFLER
Keyword(s):  
Energy Cost ◽  
Interplanar Distance ◽  
Orbital Method ◽  
Full Potential ◽  
Local Spin Density Approximation ◽  
Nearest Neighbour ◽  
Density Approximation ◽  
Neighbour Distance ◽  
Large Lattice ◽  
Fcc Phase

Using the full-potential linear muffin-tin orbital method within the local spin-density approximation we analyse the influence of the nearest neighbour distance on fcc(111) or hcp(0001) iron layers. The LDA-LSDA error in describing ferromagnetic phases is determined to be at least 15 mRy/atom. As a consequence of this error, our calculations favour paramagnetic ground states. In this sense, the reported results have some model character. However, our analysis of the elastic energy cost under distortions should hold for transition metals in general. Allowing relaxations of the interplanar distance the fcc phase can become energetically favourable over the hcp phase at large lattice mismatches. The main reason for this behaviour is the enhanced stiffness of the hcp interplanar bonds due to the shortening of the axial c/a ratio.

FUNGI IN AIR MASSES OVER MONTREAL DURING 1950 AND 1951

1956 ◽  
Vol 34 (1) ◽  
pp. 1-15 ◽  
Author(s):  
S. M. Pady ◽  
L. Kapica
Keyword(s):  
Seasonal Variation ◽  
Pollen Grains ◽  
Average Concentration ◽  
Yeast Cells ◽  
The Sun ◽  
Air Masses ◽  
Air Sampler ◽  
Agricultural Areas ◽  
Very High ◽  
Made In

Numbers and kinds of fungi were determined from nutrient plate and silicone slide studies from the roof of the Sun Life Building, Montreal, between September 1950 and December 1951. Exposures of plates were made in the General Electric Bacterial Air Sampler, and plates and silicone slides in the Bourdillon Slit Sampler. A total of 978 exposures was made on 113 sampling days during 16 months; 507 plates in the G. E. Sampler, 344 plates and 127 slides in the Slit Sampler. Of 40,359 colonies examined, Cladosporium, Penicillium, yeasts, Aspergillus, Alternaria, and Actinomycetes were commonest, constituting 47.7, 15.8, 10.4, 4.6, 4.2, and 2.2% of the total. The next commonest fungi were Pullularia, Oöspora, Fusarium, Stemphylium, Verticillium, Rhizopus, Spicaria, Scopulariopsis, Phoma, Mucor, Botrytis, Cephalosporium, Trichoderma, Helmin-thosporium, Neurospora, Papularia, Cephalothecium, Pyrenochaeta, Zythia, and Nigrospora. In addition 12 genera were infrequently found. Unidentified colonies numbered 174 and nonsporulating 3371 (8.3%). On a cubic foot basis numbers in the plates varied from 17.7 per cu. ft. in August to 0.4 per cu. ft in February.Fungus spores showed a seasonal variation with summer highs averaging 244 per cu. ft. in July to a low of 0.8 per cu. ft. in December. The most abundant spores were Cladosporium, yeasts, smuts, Fusarium, Alternaria, Venturia-like, Stemphylium, rusts, Septoria, and Helminthosporium. Hyphal fragments and pollen grains were present also. On eight occasions during the summer, readings of over 200 spores per cu. ft. were recorded, the maximum being 445 per cu. ft. on September 6, 1951. Cladosporium in August reached a peak of 74.1 per cu. ft. and yeast cells in July had an average concentration of 100 per cu. ft.An analysis of the air masses indicated that pure polar air carried low numbers of fungi, whereas tropical air had very high numbers. Most of the air masses were modified polar air and their fungus content varied considerably. The fungi in the air over Montreal are believed to have had their origin in agricultural areas.

Flow Field on Helodeck of a Frigate: A Review

2019 ◽  
Vol 161 (A4) ◽  
Keyword(s):  
Flow Field ◽  
Numerical Solutions ◽  
Offshore Structures ◽  
High Speeds ◽  
High Turbulence ◽  
The Subject ◽  
Offshore Industry ◽  
The Military ◽  
Very High ◽  
Made In

The various functions desired from a frontline warship such as a frigate, corvette or a destroyer, coupled with the requirement of very high speeds and economic viability restricting the size, necessitates a very dense arrangement of weapons and sensors on the top deck and superstructure. Accordingly, Navies across the world have faced several problems with respect to functions for which a good aerodynamic design for these structures is essential. Major issues include smoke nuisance created due to impinging of the ship's exhaust gases on to the top deck leading to possible suction by engine intakes and high turbulence in the ship's air-wake leading to ship aircraft interface concerns. The flow field on the helodeck is extremely complex due to its geometry and interaction with the wake of the ship’s superstructure. A knowledge of this complexity is essential for ensuring safe helo operations on the helodeck. The problem of ship helicopter interaction has hogged the lime light in recent times, due to rising demand for design of warships for increased stealth, especially in the past two decades. Consequently, several researchers in countries with advanced Navies have invested considerable resources towards evolving both experimental and numerical solutions for the problem. However, given the military nature of the operations, open literature on the subject containing details of such research, which can be used as reference material for present work, are limited. Considering the complexities involved in the problem, an attempt has been made in this paper to holistically review the widely scattered and limited literature in this field. A good amount of literature on marine helo applications emerge from the offshore industry. Keeping in mind that the fields of warship design and offshore structures are dissimilar and have their peculiar problems, informed conclusions have been made in drawing lessons from available literature.

scholarly journals Moving Forward With Accelerometer-Assessed Physical Activity: Two Strategies to Ensure Meaningful, Interpretable, and Comparable Measures

2018 ◽  
Vol 30 (4) ◽  
pp. 450-456 ◽  
Author(s):  
Alex V. Rowlands
Keyword(s):  
Physical Activity ◽  
Black Box ◽  
Data Sets ◽  
Accelerometer Data ◽  
Future Health ◽  
The Past ◽  
Acceleration Data ◽  
Night And Day ◽  
Very High ◽  
Made In

Significant advances have been made in the measurement of physical activity in youth over the past decade. Monitors and protocols promote very high compliance, both night and day, and raw measures are available rather than “black box” counts. Consequently, many surveys and studies worldwide now assess children’s physical behaviors (physical activity, sedentary behavior, and sleep) objectively 24 hours a day, 7 days a week using accelerometers. The availability of raw acceleration data in many of these studies is both an opportunity and a challenge. The richness of the data lends itself to the continued development of innovative metrics, whereas the removal of proprietary outcomes offers considerable potential for comparability between data sets and harmonizing data. Using comparable physical activity outcomes could lead to improved precision and generalizability of recommendations for children’s present and future health. The author will discuss 2 strategies that he believes may help ensure comparability between studies and maximize the potential for data harmonization, thereby helping to capitalize on the growing body of accelerometer data describing children’s physical behaviors.

scholarly journals PEMBERDAYAAN PAGUYUBAN BATIK PENDOPO DESA JARUM BERBASIS KOMUNIKASI PEMASARAN VIRTUAL DI ERA PANDEMI COVID-19

Dharma LPPM ◽  
2021 ◽  
Vol 2 (2) ◽  
Author(s):  
Puji Lestari ◽  
Titik Kusumantini ◽  
Elisabet Isyana Rahayu ◽  
Devi Wening Astari ◽  
Muhammad Irfan
Keyword(s):  
Word Of Mouth ◽  
Marketing Communications ◽  
Marketing Communication ◽  
Community Members ◽  
Very High ◽  
Made In

Virtual marketing communication is still something new for the Paguyuban Batik Pendopo Desa Jarum. Marketing is usually done only through word of mouth and occurs offline. However, due to the COVID-19 pandemic, tourist visits to Jarum Village have greatly decreased. Virtual-based marketing communications are needed to survive in this uncertain situation. With an association that accommodates UMKM, the potential to switch from conventional marketing communications to virtual marketing communications is very high. This service stage starts from discussions with community members of Paguyuban Batik Pendopo Desa Jarum, understanding community members about the importance of virtual marketing communication, assistance in making profile videos, assistance in making websites and blogs, and assistance in creating e-commerce accounts. The contribution made in this service is the assistance of the Paguyuban Batik Pendopo Desa Jarum in virtual marketing communications, especially in the era of the COVID-19 Pandemic.

scholarly journals Seeking the Otherwise: Attending to the Complexities of Listening

2015 ◽  
Vol 39 (3) ◽  
pp. 58
Author(s):  
Vanessa Clark ◽  
Deanna Elliott
Keyword(s):  
British Columbia ◽  
Reggio Emilia ◽  
Made In

This article presents our attempt to move beyond both developmental and Reggio Emilia guidelines for listening. We situate our efforts within our wounded colonial context—what is now called Victoria, British Columbia. Our effort is to begin to consider listening within unequal spaces of power, and to wonder what ethics such arrangements might require. In our engagements with clay and stones with the children, we noticed the sound the stones and clay made. In this article, we work with several stories of our investigations into sound, which have helped us to think about the complexities of listening in childcare spaces.

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