Territory size and overlap in male Ovenbirds: contrasting a fragmented and contiguous boreal forest

2004 ◽  
Vol 82 (11) ◽  
pp. 1774-1781 ◽  
Author(s):  
Daniel F Mazerolle ◽  
Keith A Hobson
Keyword(s):  
Body Size ◽  
Boreal Forest ◽  
Strong Support ◽  
Individual Characteristics ◽  
Territory Size ◽  
Radio Tracking ◽  
Dominance Model ◽  
Seiurus Aurocapillus ◽  
Territory Overlap ◽  
The Ideal

We evaluated if male age and body size, density of conspecifics, and arthropod biomass contributed to variation in territory size and overlap of Ovenbirds, Seiurus aurocapillus (L., 1766), in a fragmented and contiguous boreal forest. Territory size and overlap were determined by radio-tracking territorial male Ovenbirds in fragmented (n = 22) and contiguous forest (n = 13) from late May to the end of June 1999 and 2000. Variation in male territory size was most strongly associated with individual characteristics, specifically body size and age. Furthermore, we found strong support for an effect of density of conspecifics on territory overlap, suggesting that the exclusivity of territories and perhaps levels of territoriality were greater for males in contiguous forest than for those in fragments. Our findings (i.e., mean territory size was similar between landscapes and territory overlap was greater in fragments than in contiguous forest) suggest that fragments either have larger areas of unsuitable habitat or are less saturated with Ovenbirds. Furthermore, because resources were not distributed equally among individuals, our results were consistent with the ideal dominance model of habitat selection. Finally, previous studies based on acoustical surveys have likely underestimated space-use requirements in forest passerines.

Body Dissatisfaction: The Ideal Body and a Summary of Theories of Development and Maintenance

2020 ◽  
Author(s):  
Daniel Talbot
Keyword(s):  
Body Size ◽  
Body Dissatisfaction ◽  
Muscle Tone ◽  
Subjective Evaluation ◽  
Male Body ◽  
Ideal Body ◽  
Physiological Outcomes ◽  
The Ideal

Body dissatisfaction can be defined as a negative subjective evaluation of one’s body as a whole, or relating to specific aspects of one’s body such as body size, shape, muscularity/muscle tone, and weight. Prior research has found that body dissatisfaction is associated with a number of negative psychological and physiological outcomes. This commentary describes the Western ideal male body, as well as providing a summary of theories of the cause and maintenance of male body dissatisfaction.

Allometry of home range size in lake and river fishes

1995 ◽  
Vol 52 (7) ◽  
pp. 1499-1508 ◽  
Author(s):  
Charles K. Minns
Keyword(s):  
Body Size ◽  
Home Range ◽  
Freshwater Fish ◽  
Fish Population ◽  
Home Range Size ◽  
Range Size ◽  
Territory Size ◽  
Home Ranges ◽  
Data Set ◽  
Terrestrial Mammals

A data set assembled from published literature supported the hypotheses that (i) home range size increases allometrically with body size in temperate freshwater fishes, and (ii) fish home ranges are larger in lakes than rivers. The allometric model fitted was home range = A∙(body size)B. Home ranges in lakes were 19–23 times larger than those in rivers. Additional analyses showed that membership in different taxonomic groupings of fish, the presence–absence of piscivory, the method of measuring home range, and the latitude position of the water bodies were not significant predictive factors. Home ranges of freshwater fish were smaller than those of terrestrial mammals, birds, and lizards. Home ranges were larger than area per fish values derived by inverting fish population and assemblage density–size relationships from lakes and rivers and territory–size relationships in stream salmonids. The weight exponent (B) of fish home range was lower than values reported for other vertebrates, 0.58 versus a range of 0.96–1.14. Lake–river home range differences were consistent with differences reported in allometric models of freshwater fish density and production.

scholarly journals Mountain colonisation, miniaturisation and ecological evolution in a radiation of direct-developing New Guinea Frogs (Choerophryne, Microhylidae)

PeerJ ◽  
2017 ◽  
Vol 5 ◽  
pp. e3077 ◽  
Author(s):  
Paul M. Oliver ◽  
Amy Iannella ◽  
Stephen J. Richards ◽  
Michael S.Y. Lee
Keyword(s):  
Body Size ◽  
Small Body ◽  
Strong Support ◽  
New Guinea ◽  
Ancestral State ◽  
Tropical Mountains ◽  
Climatic Oscillations ◽  
Evolutionary Trajectories ◽  
Montane Biodiversity ◽  
Male Calling

AimsMountain ranges in the tropics are characterised by high levels of localised endemism, often-aberrant evolutionary trajectories, and some of the world’s most diverse regional biotas. Here we investigate the evolution of montane endemism, ecology and body size in a clade of direct-developing frogs (Choerophryne,Microhylidae) from New Guinea.MethodsPhylogenetic relationships were estimated from a mitochondrial molecular dataset using Bayesian and maximum likelihood approaches. Ancestral state reconstruction was used to infer the evolution of elevational distribution, ecology (indexed by male calling height), and body size, and phylogenetically corrected regression was employed to examine the relationships between these three traits.ResultsWe obtained strong support for a monophyletic lineage comprising the majority of taxa sampled. Within this clade we identified one subclade that appears to have diversified primarily in montane habitats of the Central Cordillera (>1,000 m a.s.l.), with subsequent dispersal to isolated North Papuan Mountains. A second subclade (characterised by moderately to very elongated snouts) appears to have diversified primarily in hill forests (<1,000 m a.s.l.), with inferred independent upwards colonisations of isolated montane habitats, especially in isolated North Papuan Mountains. We found no clear relationship between extremely small body size (adult SVL less than 15 mm) and elevation, but a stronger relationship with ecology—smaller species tend to be more terrestrial.ConclusionsOrogeny and climatic oscillations have interacted to generate high montane biodiversity in New Guinea via both localised diversification within montane habitats (centric endemism) and periodic dispersal across lowland regions (eccentric endemism). The correlation between extreme miniaturisation and terrestrial habits reflects a general trend in frogs, suggesting that ecological or physiological constraints limit niche usage by miniaturised frogs, even in extremely wet environments such as tropical mountains.

scholarly journals Mountain colonisation, miniaturisation and ecological evolution in a radiation of direct developing New Guinea Frogs (Choerophryne, Microhylidae)

2017 ◽  
Author(s):  
Paul M Oliver ◽  
Amy Iannella ◽  
Stephen J Richards ◽  
Michael S.Y Lee
Keyword(s):  
Body Size ◽  
Small Body ◽  
Strong Support ◽  
New Guinea ◽  
Ancestral State ◽  
Tropical Mountains ◽  
Climatic Oscillations ◽  
Evolutionary Trajectories ◽  
Montane Biodiversity ◽  
Male Calling

Aims. Mountain ranges in the tropics are characterised by high levels of localised endemism, often-aberrant evolutionary trajectories, and some of the world’s most diverse regional biotas. Here we investigate the evolution of montane endemism, ecology and body size in a clade of direct-developing frogs (Choerophryne, Microhylidae) from New Guinea. Methods. Phylogenetic relationships were estimated from a mitochondrial molecular dataset using Bayesian and maximum likelihood approaches. Ancestral state reconstruction was used to infer the evolution of elevational distribution, ecology (indexed by male calling height), and body size, and phylogenetically corrected regression was employed to examine the relationships between these three traits. Results. We obtained strong support for a monophyletic lineage comprising the majority of taxa sampled. Within this clade we identified one subclade that appears to have diversified primarily in montane habitats of the Central Cordillera (> 1000 m. a.s.l), with subsequent dispersal to isolated North Papuan Mountains. A second subclade (characterised by moderately to very elongated snouts) appears to have diversified primarily in hill forests (< 1000 m a.s.l.), with inferred independent upwards colonisations of isolated montane habitats, especially in isolated North Papuan Mountains. We found no clear relationship between extremely small body size (adult SVL less than 15mm) and elevation, but a stronger relationship with ecology – smaller species tend to be more terrestrial. Conclusions. Orogeny and climatic oscillations have interacted to generate high montane biodiversity in New Guinea via both localised diversification within montane habitats (centric endemism) and periodic dispersal across lowland regions (eccentric endemism). The correlation between extreme miniaturisation and terrestrial habits reflects a general trend in frogs, suggesting that ecological or physiological constraints limit niche usage by miniaturised frogs, even in extremely wet environments such as tropical mountains.

scholarly journals Quantitative genetic analysis of brain size variation in sticklebacks: support for the mosaic model of brain evolution

2015 ◽  
Vol 282 (1810) ◽  
pp. 20151008 ◽  
Author(s):  
Kristina Noreikiene ◽  
Gábor Herczeg ◽  
Abigél Gonda ◽  
Gergely Balázs ◽  
Arild Husby ◽  
...  
Keyword(s):  
Body Size ◽  
Brain Size ◽  
Additive Genetic Variance ◽  
Genetic Correlations ◽  
Relative Size ◽  
Strong Support ◽  
Brain Evolution ◽  
Brain Regions ◽  
Independent Evolution ◽  
Mosaic Model

The mosaic model of brain evolution postulates that different brain regions are relatively free to evolve independently from each other. Such independent evolution is possible only if genetic correlations among the different brain regions are less than unity. We estimated heritabilities, evolvabilities and genetic correlations of relative size of the brain, and its different regions in the three-spined stickleback ( Gasterosteus aculeatus ). We found that heritabilities were low (average h 2 = 0.24), suggesting a large plastic component to brain architecture. However, evolvabilities of different brain parts were moderate, suggesting the presence of additive genetic variance to sustain a response to selection in the long term. Genetic correlations among different brain regions were low (average r G = 0.40) and significantly less than unity. These results, along with those from analyses of phenotypic and genetic integration, indicate a high degree of independence between different brain regions, suggesting that responses to selection are unlikely to be severely constrained by genetic and phenotypic correlations. Hence, the results give strong support for the mosaic model of brain evolution. However, the genetic correlation between brain and body size was high ( r G = 0.89), suggesting a constraint for independent evolution of brain and body size in sticklebacks.

scholarly journals Research on the Construction of a Student Model of an Adaptive Learning System Based on Cognitive Diagnosis Theory

2020 ◽  
Vol 12 (4) ◽  
pp. 20-31
Author(s):  
Yang Zhao ◽  
Yaqin Fan ◽  
Mingrui Yin ◽  
Cheng Fang
Keyword(s):  
Online Education ◽  
Adaptive Learning ◽  
Strong Support ◽  
Individual Characteristics ◽  
Learning System ◽  
Cognitive Diagnosis ◽  
Selection Strategy ◽  
Student Model ◽  
Adaptive Learning System ◽  
The Individual

With the promotion of online education, the adaptive learning system has attracted attention due to its good curriculum recommendation function. The student model is an important interface between the adaptive learning system and the user, reflecting the individual characteristics, knowledge status, and cognitive ability of the student. The accuracy of the information in the student model directly affects the quality of the system recommendation service. The traditional student model only judges students based on the basic information and simple test scores. This paper introduces the self-adaptive item bank and adaptive item selection strategy based on the cognitive diagnosis theory that dynamically detects the students' knowledge and analyzes the state according to the answering habits and knowledge mastering status of different students. This paper analyzes and contrasts a variety of traditional cognitive diagnosis theories and proposes a mixed cognitive diagnosis question bank and a selection strategy model to provide strong support for the construction of student models.

scholarly journals Determinants of life-history traits in a fish ectoparasite: a hierarchical analysis

Parasitology ◽  
2011 ◽  
Vol 138 (7) ◽  
pp. 848-857 ◽  
Author(s):  
G. LOOT ◽  
N. POULET ◽  
S. BROSSE ◽  
L. TUDESQUE ◽  
F. THOMAS ◽  
...  
Keyword(s):  
Life History ◽  
Body Size ◽  
Egg Size ◽  
Life History Traits ◽  
Abiotic Factors ◽  
Individual Characteristics ◽  
Trade Off ◽  
Individual Fitness ◽  
Parasite Number ◽  
Egg Number

SUMMARYObjective. Unravelling the determinants of parasite life-history traits in natural settings is complex. Here, we deciphered the relationships between biotic, abiotic factors and the variation in 4 life-history traits (body size, egg presence, egg number and egg size) in the fish ectoparasite Tracheliastes polycolpus. We then determined the factors affecting the strength of the trade-off between egg number and egg size. Methods. To do so, we used 4-level (parasite, microhabitat, host and environment) hierarchical models coupled to a field database. Results. Variation in life-history traits was mostly due to individual characteristics measured at the parasite level. At the microhabitat level (fins of fish hosts), parasite number was positively related to body size, egg presence and egg number. Higher parasite number on fins was positively associated with individual parasite fitness. At the host level, host body size was positively related to the individual fitness of the parasite; parasites were bigger and more fecund on bigger hosts. In contrast, factors measured at the environmental level had a weak influence on life-history traits. Finally, a site-dependent trade-off between egg number and egg size existed in this population. Conclusion. Our study illustrates the importance of considering parasite life-history traits in a hierarchical framework to decipher complex links between biotic, abiotic factors and parasite life-history traits.

PSYCHOLOGICAL FEATURES OF PRESENTATION AND PERCEPTION OF MOTHERS IMAGES IN ADVERTISING

2019 ◽  
pp. 60-71
Author(s):  
I. V. Klymenko ◽  
A. I. Lokhmachova
Keyword(s):  
Individual Characteristics ◽  
Target Audience ◽  
The Family ◽  
Media Space ◽  
Good Mother ◽  
The Media ◽  
Psychological Features ◽  
The Relationship ◽  
The Ideal ◽  
Husband And Wife

The article is devoted to the generalization of information about the image of the “ideal” or “good” mother and its implementation in advertising practice. The authors analyzed the evolution of this image in the media space from the concept of traditionalism (woman who is realized exclusively in the family and motherhood) to the concept of neo-traditionalism (mother, who has time for everything, including the professional sphere and the sphere of self-fulfillment). There is an increase in value of egalitarian models (partnership distribution of roles and functions between husband and wife) and the presentation of realistic ideas about a “non-ideal” mother in foreign practice. However, this trend is much less common in the Ukrainian advertising space. The authors found the most common images of mothers in Ukrainian advertising: “Selfless”, “Caring”, “Balanced”, “Hedonic”, “Rebellious” and “Supervisory” and analyzed the peculiarities of their use, the intensity of presentation, the relationship with the advertised product. The authors found that conservative images of mothers (family oriented, selfless, caring, able to keep everything under control) are generally positively perceived by the target audience. Images that are distant from such traditionalist cliché (innovative, self-centered, hedonic) are rated worse. The authors demonstrated the relationship between mothers’ individual characteristics and their tendency to favor a particular character in advertising. Women, who are more experienced, self-sufficient, tend to rely on their own experience prefer less conservative advertising images (“Balanced”, and “Hedonic”). Less experienced women, who are guided by externalities experience, are focused exclusively on child, perceive positively traditionalist images “Selfless” and “Supervisory” mother.

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