Lecture 9 - Avian Life Histories

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1 Lecture 9 - Avian Life Histories Chapters Many details in book, esp know: Chpt 12 pg , Chpt 13 pg , , Table 13-1 Chpt 14 pg , Chpt 15 pg , Chpt 16 pg

2 Outline 1. Pair formation or other variations 2. Breeding systems 3. Nesting, Care of young 4. Cooperative breeding

3 Sexual selection: Mates female preference for particular males Maintains male ornaments and displays Good-gene hypotheses Elaborate plumage and displays signal genetic superiority Index of health (parasites, stamina)

4 Mates Runaway selection hypotheses Taking good-genes hypotheses to the extreme Elaborate displays and bizarre plumage

5 Types of Pair Formations know Table 13-1 Monogamy (social) One male and one female Breeding season or for life Shared parental responsibilities Nest building Incubating Food Extra-pair copulations are the rule and not the exception = Promiscuity Not all social monogamous pairs are genetically monogamous!

6 Extra-pair copulation Promiscuity Copulation by females with additional males source of sexual selection for bright plumage Advantages Insurance against infertility Increased genetic variability inc. fitness

7 Pair Formations Getting a divorce Failure of mate to show up after winter Female may leave for better feeding ground BCCH leave males after 1 st brood for higher ranked male

8 Polygamy Pair Formations Polygyny - several females for each male Grouse, blackbirds Increased reproductive burden on female Polyandry- several males for each female Phalaropes, Spotted Sandpiper Increases reproductive burden on males

9 Evolution of Polygyny Food availability where food is superabundant = polygyny Patchily distributed resources = resource-defense polygyny More common in relatively simple habitats (e.g., marshes & grasslands)

10 Gibbs et al.-science 250: , 90 a polygynous species

11 Leks Nature s version of a singles bar Resources (e.g., food or nest sites) are superabundant Resources unpredictable in Time Space Resources costly to defend Copulations performed by few males Always those that hold central positions in lek

12 Polyandry Sex-role reversal Females defend territory Males incubate eggs and feed young Phalaropes females are brightly colored

13 Female sandpiper defending territory

14 Selection of Nest Site Usually completed by individual that is primary incubator Male may start several nests for female to choose between Perennial nests no new site selection between years (raptors, penguins)

15 Nest Types Constructed nest Majority of nests Extremely varied Cup Dome Pouch Cavity

16 Nest Types Ground nest or scrapes Little or no construction Excavated nests Primary cavity nesters excavate their own cavity Secondary cavity use previously excavated cavities Burrows Burrowing owls

17 Cavity Nesters

18 Construction material Inorganic Mud/clay Stones Organic Woody material Fine grasses Hair Saliva Feathers Spider silk Snake skins

19 Nest Building

20 Why Build a Nest? Reduce predation risk 75-88% of nest losses due to predation Differential mammalian predation for ground nests Cavity nests are safest Protect eggs from weather

21 Eggs All birds form and lay shelled egg for external incubation Oviparity (Viviparity = retention of eggs & live birth) Embryos are intolerant of high and low temperatures

22 Eggs Support and protection Shape Spherical maximize strength and conserve heat Pointed roll in tight arc Color Camouflage Bright colors (blue) function unknown?

23 Bluer eggs contained more maternal antibodies the first line of defense for freshly hatched chicks Science 311:1687, 2006

24 Clutch Size Number of eggs laid in one set Subject to: Energy constraints Lifetime reproductive success Egg production is energetically costly 40-50% of basal metabolic rate for altricial nestlings % of BMR for precocial nestlings

25 Number of Broods Most species will replace lost clutches once Some permanent residents always have > 1 brood per year Mourning Dove in SE US will have up to 6 broods per year Evolutionary tradeoff between lifetime reproductive success and life span

26 Incubation Maintain adequate temperature for development of embryo Most birds develop brood patch Loose feathers Existing apteria Some birds (e.g., lack apteria [penguins]) use feet for brooding Eggs are turned

27

28 Incubation Duties Varies among species and types of pair formation For most passerines both sexes incubate For most polygamous species, female incubates (except polyandry) Often elaborate relief ceremonies

29 Care and Development of Young

30 Stage of Development at Hatching Altricial (nest dweller) Young do not leave nest immediately Typically few if any feathers Relatively helpless Most passerines Precocial (nest fugitive) Can leave nest immediately Capable of locomotion Covered in natal down Some thermoregulatory dependence on parent

31 Brooding Continued thermoregulation of young by adult Especially important in altricial young Protects against hyper- & hypothermia Precocial young are brooded at night

32 Feeding of Young Responsibilities of 2 sexes differ among species Polygyny females do most Polyandry males do most

33 Nest/Brood Parasitism Do not incubate own eggs dump egg(s) in another species nest Both within and between species Obligate nest parasites never build own nest 1 species of obligate nest parasite in North America Brown-headed Cowbird More than 100 species known to host cowbird eggs

34

35 Nest Parasitism Depresses nesting success Rates higher in fragmented habitats Young may evict eggs of host or kill host s young (European cuckoos)

36 Cooperative Breeding Defined by regular involvement of helpers in feeding and care of young Reported in about 300 species (3 % of species) Most species long-lived minimal loss of reproductive success to helper

37 Cooperative Breeding Advantages: Group Defense Improved Survivorship Acquisition of skills Parental nepotism favoring relatives Young exhibit delayed dispersal

38 Characteristics of Cooperative Breeding Habitat, territory or nest-site limitation Suitable habitat saturated part of population remain non-breeders Deferred maturity Population has relatively old age structure

39 Cooperative Breeding NA Species: Florida Scrub Jay Red-cockaded Woodpecker Acorn Woodpecker

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