Reproductive ecology and endocrinology of the garibaldi damselfish, Hypsypops rubicundus (Pomacentridae) Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/0r967806s

Descriptions

Attribute NameValues
Creator
Abstract or Summary
  • I examined two aspects of the reproductive behavior of the garibaldi, Hypsypops rubicundus, a temperate marine damselfish with male parental care. My primary objective was to determine the relationship between female choice and male parental investment in the care of offspring. In particular, I sought to determine: (1) how the presence and developmental stage of eggs already in the nest influences female spawning site choice; (2) how male investment in current offspring varies with the number and developmental stage of eggs in his nest; and (3) how patterns of mate choice and parental investment contribute to the reproductive success of each sex. Because male courtship and parental care behaviors change during a nesting cycle, a secondary objective was to indentify associated hormonal changes that potentially cause this change in behavior. Female garibaldi showed a strong preference to spawn in nests with early stage eggs over empty nests or those with predominantly late-stage eggs. Within nests containing eggs in multiple stages of development, females always deposited their eggs among the youngest eggs in the nest. Male garibaldi exhibited behavioral tactics that would increase the mortality of eggs deposited in empty nests (first clutches) or in older broods (late clutches) and thus favor such female preference. These include: (1) cannibalism of single-clutch broods; (2) cannibalism of older eggs early in the brood-cycle; (3) cannibalism of younger eggs late in the brood-cycle; (4) increased attentiveness of larger broods; and (5) increased aggressiveness in defense of larger broods. These behaviors are consistent with the predictions of parental investment theory that males invest in current offspring in a way that maximizes the net (current plus future) benefits of paternal care. Male garibaldi actively courted females when their nests were empty. However, courtship rates declined as males acquired eggs and as those eggs aged. This was concomitant with an increase in parental egg fanning. Levels of both testosterone and 11-ketotestosterone were positively related to levels of courtship activity and inversely related to male parental egg-fanning.
Resource Type
Date Available
Date Issued
Degree Level
Degree Name
Degree Field
Degree Grantor
Commencement Year
Advisor
Academic Affiliation
Non-Academic Affiliation
Subject
Rights Statement
Peer Reviewed
Language
Digitization Specifications
  • File scanned at 300 ppi (Monochrome) using ScandAll PRO 1.8.1 on a Fi-6770A in PDF format. CVista PdfCompressor 4.0 was used for pdf compression and textual OCR.
Replaces
Additional Information
  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2012-08-07T20:57:19Z (GMT) No. of bitstreams: 1SikkelPaulC1993.pdf: 1067369 bytes, checksum: cbe8fd6895d29129c9cf772b9f93c0c0 (MD5)
  • description.provenance : Submitted by Kaylee Patterson (kdpscanner@gmail.com) on 2012-08-07T20:30:31ZNo. of bitstreams: 1SikkelPaulC1993.pdf: 1067369 bytes, checksum: cbe8fd6895d29129c9cf772b9f93c0c0 (MD5)
  • description.provenance : Made available in DSpace on 2012-08-07T21:01:57Z (GMT). No. of bitstreams: 1SikkelPaulC1993.pdf: 1067369 bytes, checksum: cbe8fd6895d29129c9cf772b9f93c0c0 (MD5) Previous issue date: 1992-11-24
  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2012-08-07T21:01:57Z (GMT) No. of bitstreams: 1SikkelPaulC1993.pdf: 1067369 bytes, checksum: cbe8fd6895d29129c9cf772b9f93c0c0 (MD5)

Relationships

Parents:

This work has no parents.

Last modified

Downloadable Content

Download PDF

Items