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The “birds and the bees”

The “birds and the bees”. Oyster Sex. Oysters spawn or reproduce during the summer (when the water reaches 75°F) by releasing eggs and sperm into the water (external fertilization)

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The “birds and the bees”

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  1. The “birds and the bees”

  2. Oyster Sex • Oysters spawn or reproduce during the summer (when the water reaches 75°F) by releasing eggs and sperm into the water (external fertilization) • The first oyster to spawn will release pheromones (chemical signals) which stimulate the oysters to spawn. The egg and sperm fuse in the water and become a fertilized egg or zygote and begins cell division.

  3. After about four hours, the zygote has developed tissues and organs • The larva is free floating, moving with the tides and winds. After about two weeks, the larva is ready to settle down and find a permanent home. It falls to the bottom and with its temporary foot, searches out clean, hard surface. When it finds a place, it secretes cement from a gland to glue itself down to the surface. There it will stay for the remainder of its life.

  4. Oyster after 29 days

  5. Oysters are especially fertile; the female laying over 5,000,000 eggs and the male 2,690,000,000 sperm. • Unfortunately for the oyster, most of these will not make it to adulthood. Only about one in a million fertilized eggs will survive to settle and grow. • Some will die due to water conditions (temperature and salinity), predation, inability to find appropriate surface to attach to and other factors. • But the planktonic oyster larvae are an important part of the food chain.

  6. Oysters, like many invertebrates are hermaphroditic. Most specifically they are sequential hermaphrodites. This means they have the ability to be both sexes although not at the same time. • Oysters start off life as male, then most will change to female.

  7. Daphnia • The mode of reproduction for Daphnia is unusual in that there is are alternating asexual (parthenogenic) and sexual stages

  8. Daphnia reproduce asexually when conditions are good and stable. They are able to make lots of offspring this way. • All daphnia produced asexually are female.

  9. Later on in the season, when conditions are not so favorable (due to overcrowding, accumulation of metabolic wastes, less food, and/or temperature begins to decrease) sexual reproduction occurs. • The eggs the female was holding will hatch into males and they will then reproduce sexually.

  10. Snake Sex • Snakes use internal fertilization • Males have a hemepenes • Females have a cloaca (posterior opening that serves as the only such opening for the intestinal, urinary, and (usually) genital tracts of certain animal species)

  11. Some snakes develop externally by laying eggs. • Snake eggs are not hard like bird eggs. They are soft like leather.The baby snakes break out by using a special egg tooth. They lose the egg tooth after they are born

  12. Some snakes give live birth like copperheads, boa constrictors, rattlesnakes, and garter snakes

  13. Earthworms • Earthworms are hermaphrodites (both female and male organs within the same individual). They have testes, seminal vesicles and male pores which produce, store and release the sperm, and ovaries and ovipores • The mating pair overlap front ends ventrally and each exchanges sperm with the other

  14. Honey Bees • A typical small hive contains perhaps 20,000 bees and these are divided into three types: Queen, Drone, and Worker

  15. The Queen: • Only 1 per hive • Lives for 2 years • Female • Kills sisters and mother • Mates with males • lay 1500 eggs/day  = 200K eggs/year

  16. The Drone: • Around 200 per hive • Live for 21-32 days spring, 90 days summer, or until mating, 0 winter • Male • Mate with queen

  17. Worker: • 20,000 to 200,000 per hive • 20-40 days summer (worked to death)140 days winter • sterile female • make comb, tend larvae, tend young dronestend queen, clean hive, gather nectargather pollen, evaporate nectar, defend hive

  18. Turkey sex • Some turkey information: • Wild turkeys are found in all of the states except Alaska. • In the winter, turkeys can fast for up to two weeks and lose 50% of their body weight before they die. • Turkeys can fly at speeds up to 55 mph. • Turkeys can run at speeds up to 12 mph

  19. Turkeys are polygamous. The males will mate with several females. • The male turkey is called a Tom or a Gobbler. • He will spread his tail feathers, lower his wings, strut around and gobble to attract females.

  20. Snood: flap of skin that hangs over the beak. • Wattle: flap of skin under the beak • Caruncle: flaps of skin at throat

  21. Hen: female turkey • Poult: baby turkey • Jake: juvenille male

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