4145475
Description
Mind Map by jclavijo13, updated more than 1 year ago
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Created by jclavijo13
almost 9 years ago
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The Lion`s mane
- main objectives
- 1. why do lions have manes?
- 2. scientists think manes must have
some specialised function because are
unique to lions.
- 3. determine if the mane function is
male-male competition, or mate choice, or
both.
- 4. importance of mane
characteristics (length and
darkness)
- 5. sexual selection and
behavior.
- 6. why don't all males
have the same mane
- 1. why do lions have manes?
- methods
- Scientists started with different
ideas as a guide
- 1. the mane is sexual
dimorphic
- theory sexual selection /
selective traits
- characterisics evolve under the
stress of competition for mates
- characterisics evolve under the
stress of competition for mates
- theory sexual selection /
selective traits
- 2. the mane
develops at puberty
- 3. is variable within and
between populations
- 1. the mane is sexual
dimorphic
- previous information
- sexual selected traits
increase reproductive
success
- 1. male-male competition
- armor
- weapons
- armor
- mate choice
- male condition
- male condition
- 1. male-male competition
- sexual selected traits
increase reproductive
success
- mane might
function in 3
ways
- shield against injury
- fighting sign
- nutrition status
- shield against injury
- two hypotheses
- mane area as a target on
fights and wounds will be found
there
- wounds in mane are more fatal
- mane area as a target on
fights and wounds will be found
there
- photographic achieves-
changes in mane
- iidentify ecological trends
- iidentify ecological trends
- behaviour among males and
females by length and darkness
- Dummies
- life-sized toy lions
- 1. (short, dark mane)
- 2. (short, blond mane)
- 3. (long, dark mane)
- 4. (long, blond mane)
- 1. (short, dark mane)
- life-sized toy lions
- Dummies
- Scientists started with different
ideas as a guide
- results
- hypotheses
- eliminate the wounds that
were not inflicted by other lions
- it didnt support the mane-as
shield hypotheses
- it didnt support the mane-as
shield hypotheses
- wounds in mane
area were not more
lethal than in other
parts of the body
- eliminate the wounds that
were not inflicted by other lions
- photographic
- develop their mane under 1
year and during that time the
main gains pigment until the
color becomes more stable
- develop their mane under 1
year and during that time the
main gains pigment until the
color becomes more stable
- Dummies
- females prefer dark manes
- manes acts as a signal
to the lions
- manes acts as a signal
to the lions
- males were sensitive to
mane darkness, avoid the
darker dummie
- male sensitive to
mane length,
avoided too
- mane length indicate
short quality in the form
of fighting success
- mane length indicate
short quality in the form
of fighting success
- females prefer dark manes
- hypotheses
- Analysis
- males with better
features are better
competitors
- females chose the
male by the benefits
of the offspring
- females chose the
male by the benefits
of the offspring
- ecological factors
- mane length
- injured males are
less able for
fighting
- manes length, little
relation to dominance
- manes length, little
relation to dominance
- injured males are
less able for
fighting
- mane darkness
- higher levels of
testosterone, more
aggressive
- provide information for
other lions.
- male dominance,
female race
- less likely to be
wounded, protection
- male dominance,
female race
- provide information for
other lions.
- higher levels of
testosterone, more
aggressive
- mane length
- why don't all males
have dark mane?
- Temperature
- lions with dark mane
would be affected by
heatstress
- Global warming
- Global warming
- lions with dark mane
would be affected by
heatstress
- Temperature
- males with better
features are better
competitors
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