• Publications
  • Influence
On the Occurrence and Significance of Motivation-Structural Rules in Some Bird and Mammal Sounds
  • E. Morton
  • Biology
  • The American Naturalist
  • 1 September 1977
The convergent use of harsh, low-frequency sounds by hostile animals and more pure tonelike, high frequency sounds by fearful or appeasing animals is discussed in an evolutionary context. It isExpand
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Ecological Sources of Selection on Avian Sounds
  • E. Morton
  • Biology
  • The American Naturalist
  • 1 January 1975
This study describes selection derived from habitat acoustics on the physical structure of avian sounds. Sound propagation tests were made in forest, edge, and grassland habitats in Panama toExpand
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  • 64
  • PDF
Behavioral ecology of tropical birds
Preface. Why are Tropical Birds Interesting? Breeding Seasons. Life History Traits. Mating Systems. Territoriality. Communication. Biotic Interactions. References. Index.
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The Effect of Breeding Synchrony On Extra-Pair Mating Systems in Songbirds
Extra-pair mating systems are now considered to be typical of songbirds because DNA fingerprinting has revealed high rates of extra-pair fertilizations (EPFs) in so many species previously thought toExpand
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  • PDF
Condition-dependent control of paternity by female purple martins: implications for coloniality
Abstract Proposed causal links between extra-pair copulation (EPC) and colony formation in socially monogamous birds hinge on the question of which sex controls fertilizations. We examined inExpand
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Predictions From the Ranging Hypothesis for the Evolution of Long Distance Signals in Birds
The Ranging Hypothesis (RH) (MORTON, 1982) proposed a form of distance assessment (ranging) based upon perception of signal degradation using memorized signals as a yardstick to distance. TheExpand
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On the Evolutionary Advantages and Disadvantages of Fruit Eating in Tropical Birds
  • E. Morton
  • Biology
  • The American Naturalist
  • 1 January 1973
Positive and negative sources of selection on fruit-eating by birds are discussed. It is hypothesized that fruit is rarely favored as the complete diet for small nestling birds because it results inExpand
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