Diet - Diet and Foraging Behavior Part 1: Consequences of...

Info iconThis preview shows pages 1–9. Sign up to view the full content.

View Full Document Right Arrow Icon
Diet and Foraging Behavior Part 1: Consequences of Diet Contrast of 2 diets: Fruits and Insects Fruits: - They are “made to be eaten” (a mutualism) - Birds get nutritious pulp; plants get seeds dispersed - Fruits are conspicuous and are easy capture and process - Almost all types of birds can eat fruit (no specialization needed)
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Consequences of Diet: Fruits (continued) Fruits are : are patchily distributed (but if one is found, a lot are found) highly seasonal in abundance (at least on a single plant) nutritionally unbalanced (lots of sugar, little protein)
Background image of page 2
Consequences of Diet: Insects Insects they avoid being eaten (hard to find) They are cryptic in many different ways (specialization required) They are relatively uncommon and even distributed Less seasonal than fruits (in tropics) A nutritionally complete food
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Consequences of diet 1. There are more species of insectivores than frugivores (due to required specialization for insectivores) continga manakins anbird flycatcher ovenbird Tropical Frugivores Tropical Insectivores Contingas: 79 Flycatchers: 365 Manakins: 59 Ovenbirds: 215 Antbirds: 222
Background image of page 4
Consequences of diet 2. Frugivores have larger population sizes than insectivores (because fruit is abundant) Golden-headed manakin White-bearded manakin 471 Individuals Silvered antbird Rufous-breased wren 5 Individuals 19 Individuals 246 Individuals Data: Mistnet captures on Trinidad. ( David Snow. )
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Consequences of diet 3. Insectivores are typically territorial (stable, nutritionally complete food resource). Frugivores are typically not territorial (lots of fruits, seasonal, poor nutrition)
Background image of page 6
Consequences of diet 4. Insectivores tend to be monogamous and dull-colored; Frugivores tend to be polygynous, with males very brightly colored (sexual selection) Dull-colored insectivores Bright-colored frugivores (often sexually dimorphic)
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Given a diet and all that goes with it, how do birds select food items? Which seeds a finch will chose?
Background image of page 8
Image of page 9
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 26

Diet - Diet and Foraging Behavior Part 1: Consequences of...

This preview shows document pages 1 - 9. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online