Regulation of nematode fecundity in the ring-necked pheasant (Phasianus colchicus): not just density dependence

Parasitology ◽  
1999 ◽  
Vol 118 (4) ◽  
pp. 417-423 ◽  
Author(s):  
D. M. TOMPKINS ◽  
P. J. HUDSON
Keyword(s):  
Density Dependence ◽  
Good Predictor ◽  
Phasianus Colchicus ◽  
Common Pattern ◽  
Infection Experiment ◽  
Stunted Growth ◽  
Heterakis Gallinarum ◽  
Parasite Intensity ◽  
Inverse Density Dependence ◽  
The Common

Patterns of nematode fecundity were investigated for infections of the caecal worm Heterakis gallinarum in the ring-necked pheasant (Phasianus colchicus). Worm length was a good predictor of parasite fecundity. After controlling for worm length no other factors, including parasite intensity, were related to worm fecundity. Density dependence in worm size was detected in natural infections at parasite intensities above a threshold of 96 worms (worm size decreased with increasing parasite intensity). However, below this threshold, worm size actually decreased with decreasing parasite intensity (inverse density dependence). The interaction between density dependence and inverse density dependence in regulating the development and subsequent fecundity of H. gallinarum worms in ring-necked pheasants was demonstrated in an infection experiment. Density dependence was observed in the stunted growth of worms in heavily infected hosts, relative to worms in lightly infected hosts. Inverse density dependence in worm size was the common pattern across hosts by the end of the experiment, when parasite intensities were below the density dependence threshold. This is the first study to document both density dependence and inverse density dependence in parasite fecundity in the same host–helminth system.

Interspecific differences in the distribution of adult and juvenile ponyfish (Leiognathidae) in the Gulf of Carpentaria, Australia

1999 ◽  
Vol 50 (7) ◽  
pp. 643 ◽  
Author(s):  
J. Staunton-Smith ◽  
S. J. M. Blaber ◽  
J. G. Greenwood
Keyword(s):  
Linear Increase ◽  
Small Fish ◽  
Common Pattern ◽  
Widespread Species ◽  
Nursery Areas ◽  
Interspecific Differences ◽  
Coastal Species ◽  
The Common ◽  
The Mean ◽  
Coexisting Species

The distribution of leiognathids was investigated at 261 sites spread throughout the Gulf of Carpentaria. Eight species, Gazza minuta, Leiognathus decorus, L. equulus, L. fasciatus, L. leuciscus, L. smithursti, L. splendens and Secutor ruconius, were usually restricted to coastal areas, whereas four species, L. bindus, L. moretoniensis, Leiognathus sp. and S. insidiator, were not. Two other species, L. aureus and L. elongatus, were caught at only one site each. The relationships between size of fish and depth in Albatross Bay were investigated by examining the mean weight and minimum and maximum lengths of different species in 356 trawls. Six of the coastal species showed the common pattern of linear increase in size with depth. This pattern is consistent with the existence of estuarine and/or inshore nursery areas, and supports previous observations of these species. In contrast, three of the widespread species exhibited approximately quadratic relationships between size and depth. This unusual pattern resulted from small fish living in both the shallow inshore areas and deeper offshore areas, and it may reduce competition among the juveniles of the large number of very abundant, coexisting species of leiognathid.

scholarly journals Influence of Pre-Sampling Handling Duration on Selected Biochemical Indices in the Common Pheasant (Phasianus colchicus)

2009 ◽  
Vol 78 (1) ◽  
pp. 23-28 ◽  
Author(s):  
Petr Chloupek ◽  
Eva Voslářová ◽  
Pavel Suchý ◽  
Iveta Bedáňová ◽  
Vladimíra Pištěková ◽  
...  
Keyword(s):  
Czech Republic ◽  
Glucose Concentration ◽  
Plasma Concentrations ◽  
Plasma Corticosterone ◽  
Phasianus Colchicus ◽  
Blood Samples ◽  
Common Pheasant ◽  
The Common ◽  
Glucose Plasma ◽  
Biochemical Indices

The effects of varying periods of pre-sampling handling (1.5 min, 3 min, 4.5 min, 6 min) on selected biochemical indices were monitored in a group of 8–9-month-old common pheasants (Phasianus colchicus) kept at a pheasantry in Jinačovice, Czech Republic. The duration of pheasant handling (capture, restraint, and blood sampling) was positively correlated with plasma corticosterone (p < 0.001) and lactate (p < 0.05) levels. Negative correlations were found between the handling duration and glucose concentration (p < 0.01), and aspartate aminotransferase level (p < 0.05) in the blood plasma. A significant increase in corticosterone plasma concentrations and a decrease in glucose plasma concentrations were already found in blood samples taken after 3 min of capture in comparison to blood samples of pheasants taken within 1.5 min.

scholarly journals Ethnography and Ethnographers in Museum-Community Partnerships

2000 ◽  
Vol 22 (4) ◽  
pp. 29-32 ◽  
Author(s):  
Jason Jackson
Keyword(s):  
American Association ◽  
Cultural Anthropology ◽  
The United States ◽  
Community Partnerships ◽  
Public Institutions ◽  
American Museum ◽  
Common Pattern ◽  
The Common ◽  
Work Done

During the 1999 American Association of Museums (AAM) meetings, museum workers reflected on ways in which their institutions could become more relevant. Social structures that have supported museums are rapidly changing and in which cultural diversity is increasingly recognized as both a social value and as a pragmatic challenge for public institutions. Although the forms they take are almost as diverse as the American museum community itself, models of direct collaboration between museums and specific local communities (ethnic, religious, occupational, etc.) are becoming a standard part of museum-based exhibition and research. While this common pattern is emerging, there are wide gaps existing between the aspirations and rhetoric of museum advocates of collaboration and the real work done throughout the United States. What is often missing in collaborative exhibition projects exploring local artistic, cultural, or historical traditions are the values and perspectives that are the common background of professional cultural anthropology and folklore research. In this essay I present, as a case study, an account of a collaborative exhibition project at Tulsa's Gilcrease Museum where I, until recently, served as Curator of Anthropology.

Quantitative studies on Heterakis gallinarum infections in the common fowl, Gallus gallus L.

1975 ◽  
Vol 49 (4) ◽  
pp. 229-244 ◽  
Author(s):  
Paul E. M. Fine
Keyword(s):  
Differential Mortality ◽  
Migration Patterns ◽  
Male And Female ◽  
Heterakis Gallinarum ◽  
Quantitative Studies ◽  
Opposite Sex ◽  
The Common ◽  
And Migration ◽  
The Right ◽  
Do So

ABSTRACTThe fertility, mortality, and migration patterns of Heterakis gallinarum were studied in chickens with concomitant Parahistomonas wenrichi infections. H. gallinarum females were found to produce approximately 936 ova per day, when 50 days of age, and a total of 34,000 to 86,000 ova in a lifetime. There was no evidence of differential mortality between the sexes, nor of a preference for either the left or the right caecal organ of chickens. Both male and female worms are capable of migrating between caeca, and are especially prone to do so when in the absence of individuals of the opposite sex.

Density Dependence in the Common Lizard: Demographic Consequences of a Density Manipulation

Ecology ◽  
1992 ◽  
Vol 73 (5) ◽  
pp. 1742-1756 ◽  
Author(s):  
Manuel Massot ◽  
Jean Clobert ◽  
Thierry Pilorge ◽  
Jane Lecomte ◽  
Robert Barbault
Keyword(s):  
Density Dependence ◽  
Common Lizard ◽  
The Common

Density dependence, regulation and variability in animal populations

1990 ◽  
Vol 330 (1257) ◽  
pp. 141-150 ◽  
Keyword(s):  
Density Dependence ◽  
Population Regulation ◽  
Time Series Data ◽  
Complex Dynamics ◽  
Natural Populations ◽  
Single Species ◽  
Abundant Species ◽  
Series Data ◽  
Animal Populations ◽  
The Common

This paper reviews a series of approaches to the study of density dependence, regulation and variability in terrestrial animals, by using single-species, multispecies and life table time series data. Special emphasis is given to the degree of density dependence in the level of variability, which is seldom discussed in this context, but which is conceptually related to population regulation. Broad patterns in density dependence, regulation and variability in vertebrates and arthropods are described, with some more specific results for moths and aphids. Vertebrates have generally less variable populations than arthropods, which is the only well documented, consistent pattern in population variability. The degree of density dependence of variability is negatively correlated with the average level of variability, suggesting that generally the more regulated populations are less variable. Most population studies, especially on insects, have involved outbreak species with complex dynamics, which may explain the common failures to detect density dependence in natural populations. In British moths, density dependence is less obvious in the more abundant species. The study of uncommon and rare species remains a major challenge for population ecology.

scholarly journals Regionally divergent drivers of historical diversification in the late Quaternary in a widely distributed generalist species, the common pheasant Phasianus colchicus

2019 ◽  
Author(s):  
Simin Liu ◽  
Yang Liu ◽  
Edouard Jelen ◽  
Mansour Alibadian ◽  
Cheng-Te Yao ◽  
...  
Keyword(s):  
Central Asia ◽  
Demographic History ◽  
Central China ◽  
Phylogeographic Structure ◽  
Phasianus Colchicus ◽  
Widespread Species ◽  
South Central ◽  
Common Pheasant ◽  
The Common ◽  
Spatio Temporal

ABSTRACTAimHistorical factors such as Pleistocene climate cycles and associated environmental changes have influenced the phylogeographic structure and demographic dynamics of many species. Resulting patterns not only depend on species’ life-history but also vary regionally. Consequently, different populations of species with large ranges over different biomes might have experienced divergent drivers of diversification and show different population histories. Such a representative species is the common pheasant Phasianus colchicus, an ecological generalist with a wide distribution in the Palearctic and at the edge of the Oriental region. We aimed at identifying distinct phylogeographic lineages of the common pheasant and investigating their evolutionary trajectories.Study locationAsiaMethodsWe used coalescent approaches to describe the phylogeographic structure and to reconstruct the spatio-temporal diversification and demographic history of the common pheasant based on a comprehensive geographic sampling of 265 individuals genotyped at seven nuclear and two mitochondrial loci.ResultsThe common pheasant diversified during the late Pleistocene into eight distinct evolutionary lineages which only partly correspond to traditional morphological groups. It originated at the edge of the Qinghai-Tibetan plateau and spread from there to East and Central Asia. Only the widely distributed genetically uniform lowland lineage of East Asia showed a recent range and population expansion, starting during last glacial. More phylogeographic structure was found elsewhere with lineages showing no signs of recent range expansions. One lineage of subtropical south-central China this is the result of long-term isolation in a climatically stable and topographically complex region. In others from arid Central Asia and China, demographic and range expansions were impeded by repeated population fragmentation during dry glacial and recent aridification. Given such a phylogeographic structure and demographic scenarios among lineages, we proposed split the range-wide common pheasant into three species.Main conclusionsSpatio-temporal phylogeographic frameworks of widespread species complexes such as the common pheasant provide valuable opportunities to identify regionally divergent drivers of diversification.

scholarly journals THEMATIC PROGRESSION IN JAKARTA POST AND ‘KOMPAS’ NEWSPAPER EDITORIALS: A COMPARATIVE STUDY ON TEXT COHERENCE STRATEGY

2018 ◽  
Vol 1 (1) ◽  
pp. 82-96
Author(s):  
Neni Triyana ◽  
Safnil Arsyad ◽  
Arono Arono
Keyword(s):  
Comparative Study ◽  
Mixed Method ◽  
Research Method ◽  
Common Pattern ◽  
Research Instrument ◽  
Text Coherence ◽  
Thematic Progression ◽  
The Common ◽  
The Difference ◽  
Newspaper Editorials

This research objective are analyze the common pattern in Jakarta Post and ‘Kompas’ newspaper editorials. The research method used was a mixed method. The research instrument is checklist. The procedure classifies all objects (10 texts Jakarta Post newspaper editorials and 10 texts ‘Kompas’ newspaper editorials) on the thematic progression patterns are checklist. The result showsthat the thematic progression in Jakarta Post and ‘Kompas’ newspaper editorials are found 3 patterns of thematic progression; 10 texts derived theme; 8 texts Constant progression, and 2 text linear progression. The different on thematic progression in Jakarta post and “Kompas’ newspaper editorials is  difference,the difference of sequence in the patterns between Jakarta Post and ‘Kompas’ newspaper editorials. The Conclussion Thematic Progression in Jakarta Postand ‘Kompas’ newspaper editorials are derived theme and Constant progression.

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