Birds and mating systems

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Biological diverstiy - birds+mating systems

  • investment - parenting 
  • crocodiles nest guard+guard young
  • reducing weight - eggs - flight = limits egg size
  • young = altricial - born blind, featherless+helpness
  • early stage - development - hatch investment - parents = nest defence, incubation eggs, feeding
  • survival - young requires biparental input
  • stable environments - guaranteed food supply+few predators = smaller clutch size
  • David Lack suggests average clutch size reflects number lead - most surviving offspring (natural selection)
  • evidence - birds decide clutch size (some extent) - phenotypic plasticity 
  • r type strategy = lots eggs - less time - each egg
  • k type strategy = few eggs - more time - each egg
  • more organism invests resources - reproduction - less resources - own survival 
  • lack clutch size not generally seen - clutch size = below optimum - offspring survival - reflects adult mortality 
  • female invests more - beginning = more costly produce egg than sperm 
  • amount energy needed - raising young promotes monogamy
  • more - 90% bird species = monogamous
  • some species, both genders - brooding patches
  • birds appeared - monogamy - not always. Dunnocks - various mating strategies
  • social mating system. genetic mating system
  • extrapair fertilisation/copulations = common - genetic testing…

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