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1

Digitale Medien

Aerodynamics and the evolution of long tails in birds (1993)

Balmford, Andrew ; Thomas, Adrian L. R. ; Jones, Ian L.

[s.l.] : Nature Publishing Group

Nature 361 (1993), S. 628-631

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ISSN: 1476-4687

Quelle: Nature Archives 1869 - 2009

Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik

Notizen: [Auszug] Although evidence is accumulating that in a number of birds females prefer long-tailed mates1"3, the role of natural selection in tail elaboration has been largely ignored. Evidence that long tails impose viability costs is very limited8"10, yet without this it remains possible that tail elongation ...

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1038/361628a0

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2

Digitale Medien

Swallowing ornamental asymmetry (1992)

Balmford, Andrew ; Thomas, Adrian

[s.l.] : Nature Publishing Group

Nature 359 (1992), S. 487-487

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ISSN: 1476-4687

Quelle: Nature Archives 1869 - 2009

Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik

Notizen: [Auszug] SIR - M011er1 provides convincing evidence that the reproductive success of male swallows (Hirundo rusticd) is independently increased by both the length and degree of symmetry of their outermost tail feathers. He suggests that the greater success of males with symmetrical tails arises not through ...

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1038/359487a0

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3

Digitale Medien

Avian endemism and forest loss (1994)

Balmford, Andrew ; Long, Adrian

[s.l.] : Nature Publishing Group

Nature 372 (1994), S. 623-624

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ISSN: 1476-4687

Quelle: Nature Archives 1869 - 2009

Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik

Notizen: [Auszug] SIR - New statistics on tropical deforestation make grim reading1. Overall annual losses of open and closed forests averaged 15.4 million hectares during 1981-90 (equivalent to 0.8% per annum)1, and appear to be accelerating2'4. Here we show that these results reveal an additional cause ...

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1038/372623a0

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4

Digitale Medien

Testing hotspot models of lek evolution: data from three species of ungulates (1993)

Balmford, Andrew ; Deutsch, James C. ; Nefdt, Rory J. C. ; [weitere]

Springer

Behavioral ecology and sociobiology 33 (1993), S. 57-65

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ISSN: 1432-0762

Quelle: Springer Online Journal Archives 1860-2000

Thema: Biologie

Notizen: Summary Hotspot models propose that leks have evolved because certain sites are associated with extremely high female encounter rates. In this paper we test five predictions of hotspot models, using data from studies of three species of lekking ungulates. As predicted, we found that lekking species generally had large female home ranges. However, in contrast to other predictions of hotspot models, ungulate leks did not occur at sites of maximum adult female density, lekking was not associated with low overall female density, and the adult sex ratio and the proportion of females that were in oestrus both differed substantially between leks and off-lek areas. Our empirical results therefore confirm recent theoretical assessments of the hotspot process, suggesting that while hotspots may help explain broad patterns of male dispersion, further mechanisms are needed to generate the extent of territory clustering seen at leks.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00164347

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5

Digitale Medien

Correlates of female choice in resource-defending antelope (1992)

Balmford, Andrew ; Rosser, A. M. ; Albon, S. D.

Springer

Behavioral ecology and sociobiology 31 (1992), S. 107-114

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ISSN: 1432-0762

Quelle: Springer Online Journal Archives 1860-2000

Thema: Biologie

Notizen: Summary Where males offer their mates assistance in rearing offspring as well as access to defended resources, female mate choice should be influenced by both male phenotype and resource quality. In contrast, where there is no paternal care the relative importance of choice for male and territory traits is less well understood. We looked at female distribution across male territories in order to assess mate choice criteria in puku Kobus vardoni, and topi Damaliscus lunatus, two antelope where males defend resources but are not involved in parental care. In both species female distribution was correlated with male phenotype as well as the quality of forage and risk of predation on different territories. Male and territory characteristics were intercorrelated, but statistical analysis revealed that male traits, forage quality and predation risk were all significant, independent predictors of female choice in both study species. This is the first demonstration that female choice in mammals might be simultaneously influenced by male phenotype as well as the quality of defended resources.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00166343

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