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Week 11: Reproduction male strategies

Week 11: Reproduction male strategies. testes <12% by weight. ovaries 30-70% by weight. environmental triggers organismal results. CNS/brain. Siluriformes Gasterosteiformes. parental care. Siluriformes. catfish males with “kittens”. Ancistrus sp. Rinoloricara

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Week 11: Reproduction male strategies

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  1. Week 11: Reproduction male strategies

  2. testes <12% by weight ovaries 30-70% by weight

  3. environmental triggers organismal results CNS/brain

  4. Siluriformes Gasterosteiformes parental care

  5. Siluriformes catfish males with “kittens” Ancistrus sp. Rinoloricara microlepidogaster

  6. Ariidae male mouth brooders striped eel-tail catfish Plotosus lineatus Indo-Pacific from Japan to Australia

  7. Ariidae ~50 eggs ~4 weeks no food guards fry ~ 2 weeks Galeichthys felis

  8. Siluriformes Gasterosteiformes body brooding

  9. three spine stickleback Gasterosteus aculeatus courtship aggression parental care nest building/ kidney glue

  10. aggression

  11. three spine stickleback Gasterosteus aculeatus

  12. male leafy sea dragon Phycodorus eques

  13. H. whitei

  14. reinforce monogamous bonding assess status colors movement ~10 min. spotted seahorse Hippocampus kuda

  15. range differences courtship 1x/day (am) H. reidi

  16. female egg transfer male fertilizes eggs to male brood pouch with ovipositer ~5 to 1500 eggs ~10 eggs/s

  17. H. breviceps delivery ~ 2 days male with brood 2 to 4 weeks ~ temperature hormone prolactin (mammal milk production)

  18. H. whitei ¼ to ½ inch size

  19. miniature adults

  20. environmental triggers organismal results CNS/brain

  21. Week 11: Reproduction alternative strategies

  22. Cypriniformes

  23. brood hider ~adults parasitized by bivalve larval stage

  24. Siluriformes Callichthyidae armored catfishes females swallow sperm excrete sperm and mix with eggs n pelvic fin Corydoras panda Corydoras barbatus

  25. Siluriformes Mochokidae squeakers upside-down catfishes macroparasites ~cuckoo birds

  26. “cuckoldry” on mouth brooding African cichlids Pseudotropheus zebra Synodontis multipunctatus

  27. catfish pair and cichlid pair spawn simultaneously cichlid female gathers all eggs in mouth

  28. female cichlid broods both cichlid and catfish eggs catfish feed on cichlid

  29. cichlid brooding catfish...

  30. sneaker/satellite/jack male

  31. ESS – evolutionary stable strategy

  32. “hot males” Week 9

  33. sexual: recombination ~2 chromosome sets (2N) asexual: parthenogenesis ~ 1 chromosome set (1N) same species 2N 1N

  34. parthenogenesis (asexuality 2N) in captive Chondrichthyes 2002: Sphyrna tiburo, bonnethead in Nebraska 2008: Carcharhinus limbatus Atlantic blacktip shark in Virginia 1N polar body = 2nd chromosome set 2N

  35. 1N 2N Chapman et al., 2008 J. Fish Biology 73:6 (1473-1477)

  36. Week 9

  37. sexual: gynogenesis ~ 1 to 3 chromosome sets (1N, 2N, 3N) hybridogenesis multiple species

  38. Cypriniformes ~gynogenetic X1X1 sexual all-female populations wild Chinese golden veiled crucian goldfish Carassius auratus • most varieties • oldest domestication • ~1400 YA T’ang Dynasty

  39. Cypriniformes ~gynogenetic X1Y1 sexual all-male populations Iberian minnow Southern Europe (Spain, Portugal)

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