thumbnail

Demographic patterns of postfire regeneration in mediterranean-climate shrublands of California

Ecological Monographs

By:
, , and

Links

  • The Publications Warehouse does not have links to digital versions of this publication at this time
  • Download citation as: RIS

Abstract

Eggs of captive black ducks fed diets containing DDE at 10 and 30 ppm (dry weight) experienced significant shell thinning and an increase in shell cracking when compared to eggs of untreated black ducks. Eggshells from dosed ducks were: 18-24 percent thinner at the equator than shells from undosed ducks; 28-31 percent thinner at the cap; and 29-38 percent thinner at the apex. Shell cracking averaged 21 percent among eggs fram the 30 ppm DDE dosage and 10 percent among eggs from the 10 ppm dosage. Only 2 percent of the eggs from untreated black ducks were cracked. Survival of ducklings fram dosed parents in terms of 'percentage of 21-day ducklings of embryonated eggs' was 40-76 percent lower than survival of ducklings from undosed parents. Average DDE residues (wet weight) in eggs from hens fed 10 and 30 ppm DDE were 46 ppm and 144 ppm, respectively.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Demographic patterns of postfire regeneration in mediterranean-climate shrublands of California
Series title:
Ecological Monographs
Volume
76
Year Published:
2006
Language:
English
Contributing office(s):
Western Ecological Research Center
Description:
p. 235-255
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Ecological Monographs
First page:
235
Last page:
255