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Seasonal changes in gonadal steroids of a monogamous versus a polyandrous shorebird
- Source :
- General and Comparative Endocrinology. 80:407-418
- Publication Year :
- 1990
- Publisher :
- Elsevier BV, 1990.
-
Abstract
- We examined the relationship between circulating levels of gonadal steroids (testosterone, progesterone, and estradiol) and breeding behavior in semipalmated sandpipers (Calidris pusilla) and red-necked phalaropes (Phalaropus lobatus) breeding sympatrically at La Pérouse Bay, 40 km east of Churchill, Manitoba. Semipalmated sandpipers are territorial and monogamous. Both parents incubate equally. Red-necked phalaropes are nonterritorial and polyandrous. Only male phalaropes care for eggs and young. Gonadal steroid hormone profiles were not reversed in the sex-role-reversed species. There was little difference in testosterone profiles between males of the territorial and nonterritorial species.
- Subjects :
- Male
food.ingredient
medicine.drug_class
Phalaropus lobatus
Biology
Birds
Sexual Behavior, Animal
Sex Factors
Endocrinology
food
Species Specificity
medicine
Seasonal breeder
Animals
Testosterone
Progesterone
Estradiol
Ecology
Androgen
biology.organism_classification
Calidris
Estrogen
Female
Animal Science and Zoology
Seasons
Bay
Subjects
Details
- ISSN :
- 00166480
- Volume :
- 80
- Database :
- OpenAIRE
- Journal :
- General and Comparative Endocrinology
- Accession number :
- edsair.doi.dedup.....b2abea16b933dec6a458401140153da2