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Lecture

Sexual Selection and Mating Strategies

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Department
Anthropology
Course
ANTC23H3
Professor
Joyce Parga
Semester
Summer

Description
Announcements:Midtermin2weeks SexualSelectionand MatingStrategies May-22-12 1:01 PM SexualSelection MatingStrategies MaleMatingStrategies - MatingSuccessv.ReproductiveSuccess - SexualCoercion - Sneakcopulations ○ Howmanycopulationsv.Howmanyviable ○ Theshoworthreatofforcethat ○ Patasmonkeyfemaleswillsometimessneakawayandmate offspringproduced makesafemalemorelikelytomate withextra-groupmales - SexDifferencesinlimitingfactorsforreproduction withamalewhensheisfertileat ○ Japanesemacaquefemaleswillsneakawayfromhigh-ranking ○ MaleRS islimitedbyaccesstomates somecostto thefemale mate-guardingmalestomalewithsubordinatemales ○ FemaleRSislimitedbyaccesstoresources ○ Example:neck-bitingwith - Consortship (food,water,etc.) Hamadryasbaboon,aggressionby ○ Close,temporaryassociationbetweenamaleandanestrous  Femalestypicallydon'thaveaproblem chimpanzeesandgorillas, female findingmates orangutans ○ Frequentgrooming,restingtogetherincontact;highfrequency  Problemishavingresourcestogo ○ ForcedCopulation ofaffiliativebehaviour throughpregnancy,childbirth,etc.  Anextremeformofsexual - MateGuarding ○ Maleshaveahigherpotentialreproductive coercioninwhichan ○ Pre-copulatory ratesthanfemales individualisforciblymated ○ Post-copulatory  Femaleslimitedbygestationand  Orangutans,forced - MaleCoalitionformation lactation copulationisperformedby ○ Particularofbaboons  Maleslimitedbynumberoffemales bothunflangedandflanged ○ Malescooperatetocollectivelymate-guardfemales,todisrupt availableforinsemination males(notjustbythosewho consortshipofanothermale - Reproductivevariability cannotgetmates) - Infanticide(SexuallySelected) ○ Malesshowgreaterreproductivevariabilityin  Patasmonkey,spider ○ Anact by an individualthatmakesadirectorsignificant RSthan females[ReproductiveSkew] monkey,bonnetmacaque, contributiontotheimmediateorimminentdeathofa  UnequalpartitioningofRSamong orangutan,andotherspecies conspecificyoung individualsinapopulation-Reproductive onoccasion ○ AlotinHanuman Langurs Skew ○ SexualAggressioninhumans ○ Characteristics  Somemalessiremanyoffspring,some  Sexualcoercionandforced  Maleskillinfantsthatarenottheirown sirenone copulationashumanmale  Infanticideshouldshortenthemother'sinterbirth ○ Femalestypicallyshowlessreproductiveskew matingstrategies? interval;stoplactationalamenorrhea - SexualSelectionis:aformofnaturalselectionacting □ Evolutionary  Malemakesitmorelikelythatthenextoffspringshe onvariationintheabilityofindividualstocompete Psychologists produceswillbehisoffspring withothersoftheirownsexandtoattract members □ Ifthisisthecase,then ○ Examples:capuchinmonkeys,chimpanzees,patasmonkey, oftheoppositesex themalesexpectedto ring-tailedlemurs,gorilla,colobusmonkey,sifaka,howler ○ InTRA-sexualselection[typicallyphysical, usethisstrategywould monkeys,etc. alwaysdirectcompetition] bemalesunsuccessful ○ Somedonotbelieveitissexuallyselection  Withinthesex;male/maleor incompetitionfor  By-productofinter-groupaggression mates female/femalecompetition  Socialpathologyduetoovercrowding  Canresultinsecondarysexual  Except:rape
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