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Marjorie May Dixon

Marjorie May Dixon

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12
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Publications

Publications (12)
Preprint
A bstract To be efficient while foraging, animals should be selective about attending to and remembering the cues of food that best predict future meals. One hypothesis is that animals with different foraging strategies should vary in their reliance on spatial and feature cues. Animals that store food or feed on spatially stable food, like fruit or...
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Long-term memory has clear advantages for animals but also has neurological and behavioral costs1, 2, 3. Encoding memories is metabolically expensive¹. Older memories can interfere with retrieval of more recent memories³, prolong decision-making and reduce cognitive flexibility²,³. Given these opposing selection pressures, understanding how long me...
Preprint
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Long-term memory has clear advantages but also has neurological and behavioral costs. Given these opposing selection pressures, understanding how long memories last can shed light on how memory enhances or constrains animals' abilities to exploit their niches. Although testing memory retention in wild animals is difficult, it is important because c...
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Tropical ecosystems are known for high species diversity. Adaptations permitting niche differentiation enable species to coexist. Historically, research focused primarily on morphological and behavioral adaptations for foraging, roosting, and other basic ecological factors. Another important factor, however, is differences in sensory capabilities....
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Metabarcoding of prey DNA from fecal samples can be used to design behavioral experiments to study the foraging behavior and sensory ecology of predators. The frog-eating bat, Trachops cirrhosus, eavesdrops on the mating calls of its anuran prey. We captured wild T. cirrhosus and identified prey remains in the bats’ fecal samples using DNA metabarc...
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Animals are often confronted with more sensory stimuli than they can attend to, and so should pay attention to stimuli that are relevant to them and habituate to those that are not. We investigated attention in the fringe-lipped bat, Trachops cirrhosus, by playing repeated prey sounds to bats in a habituation-discrimination paradigm. We measured tw...
Article
Although famous for photic courtship displays, fireflies (Coleoptera: Lampyridae) are also notable for emitting strong odors when molested. The identity of volatile emissions and their possible role, along with photic signals, as aposematic warnings of unpalatability have been little explored, especially in tropical species. Pursuant to the observa...
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Many predators and parasites eavesdrop on the communication signals of their prey. Eavesdropping is typically studied as dyadic predator-prey species interactions; yet in nature, most predators target multiple prey species and most prey must evade multiple predator species. The impact of predator communities on prey signal evolution is not well und...
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Many sexual displays contain multiple components that are received through a variety of sensory modalities. Primary and secondary signal components can interact to induce novel receiver responses and become targets of sexual selection as complex signals. However, predators can also use these complex signals for prey assessment, which may limit the...

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