It’s generally approved that the positioning, attendance, and security of your nest will be head affairs you to definitely influence the new viability off egg and speed out of nest predation ( Arnold et al. 1987, Martin 1995, Cresswell 1997). Constancy through the incubation provides a great thermal environment to your innovation regarding embryos and you can protects eggs from high temperatures that could apply at the hatchability ( Offer 1982). Into the species where singular sex incubates, you will find a swap-from ranging from attendance and you will defense of one’s colony and repair from a favorable times harmony ( Thompson and you will Ravelin 1987, Flint and Huge 1999). Likewise, nest notice can also be reduce steadily the threat of eggs predation often from the productive nest security otherwise down to a reduction of new incubation age of egg, and this a reduced amount of date they are met with predators ( Clutton-Brock 1991, Creswell 1997, Flint and you may Grand 1999).
Measures
When you look at the Greater Rheas (Rhea americana), adult care and attention is performed entirely of the males, having women limiting their resource into creation and putting regarding eggs. Rhea guys create brand new colony, incubate the fresh new egg, and you can look after the chicks immediately after hatching ( Muniz 1885, Bruning 1974, Fernandez and you may Reboreda 1998). Where varieties, the fresh mating system integrates harem polygyny and you may sequential polyandry ( Muniz 1885, Bruning 1974). Early in the brand new reproduction 12 months (August–September) males vie having, and you can safeguard a team otherwise harem of five so you’re able to 7 women. The male copulates toward women at least once most of the several to 3 weeks. Ladies lay egg all forty eight h to have 10–several days when you look at the a communal colony ( Bruning 1974, Fernandez and Reboreda 1998). Read More