نتایج جستجو برای: language nest

تعداد نتایج: 440672  

2002
REBECCA T. KIMBALL

-Previous research on House Sparrows (Passer domesticus) in Europe indicated that males with larger bibs are more likely to obtain nest sites with multiple potential nests. To test this observation experimentally, I created nest sites containing either one or two nest boxes. 1 found no morphological differences, including bib size, between males at single-box nest sites (SBNS’s) and those at do...

2001
JAMES J. ROPER

Audubon’s Hermit Thrushes (Cutharus guttatus auduboni) in central Arizona have a low nesting success (7 to 20%) due almost exclusively to nest predation. We examine the sites chosen for nesting and compare them to nonuse sites randomly selected within the vegetation types associated with nests. Hermit Thrush nest sites differ from nonuse sites primarily in that nest sites have more small (lto 3...

2015
Alex Grendelmeier Raphaël Arlettaz Michael Gerber Gilberto Pasinelli Hans-Ulrich Peter

Identifying factors influencing a species' ecological niche and demography is a prerequisite for species conservation. However, our understanding of the interplay between demographic rates and biotic/abiotic factors is still poor for most species of conservation concern. We evaluated relevance of eight hypotheses relating to timing of breeding, temporal nest exposure, nest concealment, topograp...

Journal: :Proceedings. Biological sciences 2009
Elva J H Robinson Faith D Smith Kathryn M E Sullivan Nigel R Franks

Many individual decisions are informed by direct comparison of the alternatives. In collective decisions, however, only certain group members may have the opportunity to compare options. Emigrating ant colonies (Temnothorax albipennis) show sophisticated nest-site choice, selecting superior sites even when they are nine times further away than the alternative. How do they do this? We used radio...

2004
Michel Chapuisat Christian Bernasconi Sophie Hoehn

In unicolonial populations of ants, individuals can mix freely within large networks of nests that contain many queens. It has been proposed that the absence of aggression in unicolonial populations stems from a loss of nest mate recognition, but few studies have tested this hypothesis. We investigated patterns of aggression and nest mate recognition in the unicolonial wood ant, Formica paralug...

2001
John Bent Andrea Arpaci-Dusseau Remzi Arpaci-Dusseau Miron Livny

Current storage appliances have been traditionally designed to meet either the storage demands of a local or a wide area network. The grid is unique in that it escapes this limitation and allows users to share resources both within and between local area networks. However, this freedom creates many new challenges to storage appliances that would be used on the grid. NeST is a user-level softwar...

Journal: :Discrete Applied Mathematics 2002
Ryan B. Hayward Paul E. Kearney Andrew J. Malton

We establish results on NeST graphs (intersection tolerance graphs of neighborhood subtrees of a tree) and several subclasses. In particular, we show the equivalence of proper NeST graphs and unit NeST graphs, the equivalence of 5xed distance NeST graphs and threshold tolerance graphs, and the proper containment of NeST graphs in weakly chordal graphs. The latter two results answer questions of...

2006
MATTHEW D. JOHNSON TAMMY M. BRANSTON RYAN D. CLARK JENNIFER L. MOORE

Nest predation can greatly affect reproductive success of waterfowl. We studied factors influencing duck-nest predation near Humboldt Bay in northern California by testing the prediction that measurements of nest concealment and nest location should differ between successful and depredated artificial nests. We ran a priori hypothesized logistic regression models to evaluate the effects of nest ...

2016
Jongmin Yoon Byung-Su Kim Eun-Jin Joo Shi-Ryong Park

Some nest predators visually assess parental activities to locate a prey nest, whereas parents modify fitness-related traits to reduce the probability of nest predation, and/or nestlings fledge early to escape the risky nest environment. Here, we experimentally tested if the parental and fledging behaviours of oriental tits (Parus minor) that bred in the nest-box varied with cavity conditions a...

Journal: :Jikken dobutsu. Experimental animals 1982
T R Saito M Katsuyama K W Takahashi

Nest-building behavior in 6 female and 6 male mice of IVCS strain, 20 to 30 weeks old, was studied over a period of 24 days. Weight and style of the nest were used as measures to assess the effects of pup exposure on nest-building. Data were collected between 13 : 00 and 14 : 00 of each day. Female mice with pup exposure showed significant increases in the nest weight and the percentage of good...

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