2/13/2017 1 Kevin Hamed Virginia Highlands Community College Salamander Courtship, Mating, & Egg Deposition Lecture Goals To familiarize students with salamander courtship, mating, and egg deposition strategies Reading Assignments: 1) Organ 1958 2) Wells 2007 Chpt. 9: 404 – 418 434 – 447 Chpt. 10: 459 – 461 487 – 493 Chpt. 11: 540 – 546 Photo by Tim Herman Lecture Structure 1. Migration 2. Fertilization 3. Courtship A. Plethodontidae - Plethodon - Desmognathus B. Ambystomatidae C. Salamandridae 4. Sperm Competition 5. Egg Deposition A. Fecundity B. Location C. Parental Care
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Salamander Courtship, Mating, & Egg Depositionfwf.ag.utk.edu/mgray/wfs493/Lectures/Hamed17.pdf · 2017. 2. 13. · Courtship - Plethodontidae Male places his snout along the female’s
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2/13/2017
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Kevin Hamed
Virginia Highlands Community College
Salamander Courtship, Mating, & Egg Deposition
Lecture Goals
To familiarize students with salamander courtship, mating, and egg deposition strategies
Reading Assignments:1) Organ 19582) Wells 2007
Chpt. 9: 404 – 418434 – 447
Chpt. 10: 459 – 461487 – 493
Chpt. 11: 540 – 546
Photo by Tim Herman
Lecture Structure1. Migration
2. Fertilization
3. CourtshipA. Plethodontidae
- Plethodon- Desmognathus
B. AmbystomatidaeC. Salamandridae
4. Sperm Competition
5. Egg Deposition A. FecundityB. LocationC. Parental Care
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• Male & Female must meet
• Environmental Conditions
• Transfer of Gametes
Why Do Salamanders Reproduce?
What is necessary for reproduction
• Doomed for extinction
Migration to Breeding Areas• Often Ambystomatids• Rainy nights• Typically males migrate first
Time per spermatophore:A. maculatum 1.4 minA. opacum 4.5 min
P. jordani 56 min
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Courtship - Ambystomatidae
Courtship - Ambystomatidae
(Arnold 1977)
Competition
Spermatophore covering
Courtship - AmbystomatidaeCompetition
Benefit of Clasping?
Rapid Courtship?
(Arnold 1977)
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Courtship - Salamandridae
Notophthalmus viridescens
• Cephalic glands applied to female's nares• Clasping and continued gland application (> 45 min.)
Not always!
(Arnold 1977)
Courtship - Salamandridae
• Male fans female with tail• Violent contortions• Dismounts and deposits spermatophore• Turns and blocks female• 3.8 spermatophores per courtship
Red spotted Newt -Notophthalmus viridescens
Courtship - Salamandridae
Video
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Alpine Newt – Ichthyosaura alpestris
Courtship - Salamandridae
(Life in Cold Blood)
Courtship - SalamandridaeGenus -Triturus
Sexually dimorphic
Courtship - Salamandridae
T. vittatus
T. marmoratus
T. carnifex
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Courtship - Similarities
• Males face away from females • Females orients toward male’s gland• Male responds to contact with his cloacae• Female movement to pick-up spermatophore