World Library  


Add to Book Shelf
Flag as Inappropriate
Email this Book

Plos One : Foraging Ecology of Fall-migrating Shorebirds in the Illinois River Valley, Volume 7

By Hayward, Matt

Click here to view

Book Id: WPLBN0003937753
Format Type: PDF eBook :
File Size:
Reproduction Date: 2015

Title: Plos One : Foraging Ecology of Fall-migrating Shorebirds in the Illinois River Valley, Volume 7  
Author: Hayward, Matt
Volume: Volume 7
Language: English
Subject: Journals, Science, Medical Science
Collections: Periodicals: Journal and Magazine Collection
Historic
Publication Date:
Publisher: Plos

Description
Description : Populations of many shorebird species appear to be declining in North America, and food resources at stopover habitats may limit migratory bird populations. We investigated body condition of, and foraging habitat and diet selection by 4 species of shorebirds in the central Illinois River valley during fall migrations 2007 and 2008 (Killdeer [Charadrius vociferus], Least Sandpiper [Calidris minutilla], Pectoral Sandpiper [Calidris melanotos], and Lesser Yellowlegs [Tringa flavipes]). All species except Killdeer were in good to excellent condition, based on size-corrected body mass and fat scores. Shorebird diets were dominated by invertebrate taxa from Orders Diptera and Coleoptera. Additionally, Isopoda, Hemiptera, Hirudinea, Nematoda, and Cyprinodontiformes contribution to diets varied by shorebird species and year. We evaluated diet and foraging habitat selection by comparing aggregate percent dry mass of food items in shorebird diets and core samples from foraging substrates. Invertebrate abundances at shorebird collection sites and random sites were generally similar, indicating that birds did not select foraging patches within wetlands based on invertebrate abundance. Conversely, we found considerable evidence for selection of some diet items within particular foraging sites, and consistent avoidance of Oligochaeta. We suspect the diet selectivity we observed was a function of overall invertebrate biomass (51.264.4 [SE] kg/ha: dry mass) at our study sites, which was greater than estimates reported in most other food selection studies. Diet selectivity in shorebirds may follow tenants of optimal foraging theory: that is, at low food abundances shorebirds forage opportunistically, with the likelihood of selectivity increasing as food availability increases. Nonetheless, relationships between the abundance, availability, and consumption of Oligochaetes for and by waterbirds should be the focus of future research, because estimates of foraging carrying capacity would need to be revised downward if Oligochaetes are truly avoided or unavailable for consumption.

 

Click To View

Additional Books


  • Plos One : Prolonged Low Flow Reduces Re... (by )
  • Plos One : Medical and Household Charact... (by )
  • Plos One : Heuristic Algorithms for Assi... (by )
  • Plos One : Self-renewal and Pluripotency... (by )
  • Plos One : Lead Tolerance and Accumulati... (by )
  • Plos One : Flynap Triethylamine Increase... (by )
  • Plos One : Daily Evolution of Insulin Se... (by )
  • Plos One : Anti-thymocyte Globulin Induc... (by )
  • Plos One : Effects of Regulating Positiv... (by )
  • Plos One : Platinum-based Versus Non-pla... (by )
  • Plos One : Plasma Asymmetric Dimethylarg... (by )
  • Plos One : Intravital Fret Imaging of Tu... (by )
Scroll Left
Scroll Right

 



Copyright © World Library Foundation. All rights reserved. eBooks from World eBook Library are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.