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Abstract Detail

The evolution and ecology of aquatic bryophytes

Rosentreter, Roger [1].

American Dipper Nests Are No Gingerbread House.

American dippers are the only aquatic songbird in North America. They are non-migratory and males defend streamside territories year-round. They are known to dive to 20 feet below the surface. American dippers live along fast, clear streams with riffles, cascades, and waterfalls. They are intolerant of significant pollution. American dipper nests are a ball-like dome structure with a side entrance, and are usually built on cliff faces, in crevices, and under bridge abutments, where they avoid predators. The upper dome may overhang the entrance hole to keep out water. The outer shell is comprised of moss with a small inner chamber made of a woven pine needle cup. The composition of 20 American dipper nests was analyzed. It was found that aquatic moss species are used to make the bulk of the nests. The moist mosses are woven together and as they dry, they tighten up and become very strong, holding the nest together and to the cliffs they are built upon. Aquatic mosses are known to provide hiding cover for aquatic insects. Insect larval data support that larvae in streams containing aquatic mosses are larger compared to those in runoff-dominated streams lacking moss.  
Key Words: American dipper, bryophytes, aquatic mosses, predators

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1 - 2032 S Crystal Way, Boise, ID, 83706, USA


Presentation Type: Symposium or Colloquium Presentation
Session: SY02
Location: Payette/Boise Centre
Date: Monday, July 28th, 2014
Time: 2:15 PM
Number: SY02003
Abstract ID:81
Candidate for Awards:None

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