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6. Cervidae
   
 
   
 

UNGULATES

Phylogeny: Not fully resolved, Ungula (Latin): hoof
Interesting:

  • Elephants are closely related to manatees and hyraxes
  • Hippo’s closest relatives are Cetaceans

38 deer species, All ruminants
Order Artiodactyla > Family Cervidae

 
 
   
 

CERVIDAE

   

Species occuring in Europe:

  • Alces alces - Moose
  • Cervus elaphus - Red Deer
  • Cervus nippon - Sika deer (introduced)
  • Dama dama-Fallow Deer
  • Rangifer tarandus-Reindeer
  • Capreolus capreolus-Roe
  • Muntiacus reevesi-Muntjac (introduced)

Please, note that Roe deer is a closer relative of Elk or Mule deer than of red deer.

Figure adapted from Randi et al.

 
 

ROE DEER (Capreolus capreolus)

Odocoileinae

Adult Size: 10 to 25 kg, 60 to 75 cm at shoulder
Colouration: Summer: reddish brown. Winter: grey, pale brown (black)

 

 

Distribution: Eurasia
Habitat: forest AND field
Northern limit: > 30-50 cm snow cover in winter

 

Pick from Fellinger
 
   
       
 
Food and feeding
Method: microhistological analysis of rumen or feces.
Browsers: grasses, herbs, shrubs, tree shoots.
Winter: less selective feeding
Mátrai and Kabai (1989). Winter plant selection by red and roe deer in a forest habitat in Hungary. Acta Theriologica 34:227-234.
Red and roe deer diet in winter
Study area: mosaic habitat (pine, acacia, oak etc)
Diet of Red and Roe deer was very simlar, depended on micro-habitat
 
 
Antlers: short (<30cm)
Development: Starts during winter, Velvet, mineralization
Shedding velvet in spring

First antler: 1 point
Mature antler: 3 points

Remember: antler is built of BONE

Please visit Jeju Island page on roe deer www

 
 
Lifespan: Max. 16 years. (Bucks 5 years, does 6 to 7 years).
Heavy mortality at and shortly after birth and during first winter.
Social groups: Solitary, forming small groups in winter.
Territory: males mark and defend area from April
Scent glands: forehead, tarsal, metatarsal.

Damage to trees and shrubs

Barking: Males bark
Territorial defence? Alarm call? Pursuit-deterrant?
Reby et al. 1999. Anim Behav. see abstract

Human disturbance: solitary males barked more
Playback in territory: counterbarking, aggressive behaviour.
Function?
??? Alarm -> pursuit-deterrant -> territorial ???

Alarm signals in Concepts

 
 

Sexual dimorphism: Males slightly bigger, Males have antlers
Territory size: few square km
Overlaps with homeranges of 1.5 – 3 females

Mating in July – August Male chases female, female circles

Reproduction system: territorial polygyny (see Concepts)

       
 

Mating: July – August
Time of birth: May to June.
Gestation period: 9 months
Too long for such a small mammal?
Trick: delayed implantation
Egg is fertilized, no implantation for 4 months
Fast embrionic growth for 5 months
Number of offspring: 2 (max 3).

 
       
 

Offspring: precocial (imprinting by mother to fawn at Concepts)
Stand up, walk, suckle. Hide.
Next summer: young males leave or wander.

Found a "lost" fawn in forest? It is not lost, mother leaves fawn alown hiding except for short periods of feeding. Do not take the fawn home.
Handraised male fawn: dangerous beast by next summer.

  Reproduction rate in Hungary (Heltay, Kabai, Sugár, Mátrai)
Method: Embryo count
All populations: almost 100% fertility, 2 embryos on average
Field population: pregnant yearlings

Extra rut in January?

       
 
 

Red deer


   
 

Cervidae > Cervinae > Cervus elaphus
Distribution: Eurasia
North Amerika (elk)

Weight: 75 – 300 kg
Height: 0.75 – 1.5 m (at shoulder)

Food: any plant, including seedlings and barks of trees.
Efficient on low quality food: farming in New Zealand, Britain, Hungary etc.

 
       
 

Social behaviour: (extensive studies by Clutton-Brock)
Separate male and female groups
Diepersion: Yearlings stay with mother, mature young males leave
Method: marking calves

Females stay in matrilinear groups.
(Method: direct obeservation)

Mating: September – (October)
Rut: dominant stags go back to rutting place
herd together females and defend harem.

 
       
  Male- male competition:

Roaring contest
Clutton-Brock: replay experiment
Frequency of roaring indicates strength

 

 

       
 

Deep voice – large body in most species
In Red deer: lowered larynx
Fitch and Reby: The descended larynx is not uniquely human
http://www.st-andrews.ac.uk/~wtsf/Fitch&Reby.pdf

(as in humans)


Costs? More men than women die choking in restaurants…

 
      Link to wonderful photos: Stefan Meyers
 

Male-male competition: roaring < parallel walk < antler fight
Male-male competition: why so fierce? (Mortality can be up to 10%)

Most fighting around conception date.
Female-defence polygyny: harem
Fights and injuries: what is to gain?

 
       
  Advantages of fighting for females

Lifeime reproduction success (Clutton-Brock)

Hinds: 0-14 calves
Stags: 0-24 calves !!!

No choice for males, but fight for females

 
       
 

Male reproduction succes:

  • age: 7-11 year old stags
  • antler size
  • body weight

Repr. success of hinds: reaches maximum at age 2-3 years and stays there
repr. success of stags: maximum at 8 then declines

 
       
  Sexual dimorphism in size
Females develop faster, males keep on going for longer
 
       
 

Female reproductive strategy: trade-offs

Fertility depends on condition

Well, condition is critical in harsh Scottish islands. Among overweight Hungarian ladies adult hinds were almost 100% fertile. In better habitats 30% of yearling females were pregnant. (embrio count, Heltay, Kabai, Sugár, Mátrai)

 
       
  Condition of hinds with calves is poor. (Carcass weight, kidney fat)


 
       
 

Mortality of milk hinds is higher that that of hinds wothout calves.

Trade-offs: good condition is needed for reproduction. However, having a calf lowers condition and increases chances to die.

Strategy: have a calf every second year.

Would you have a boy or a girl? (see Concepts)

 
       
 

Fallow deer

Cervidae > Cervinae > Dama dama
Distribution: Asia minor, along the Mediterranean Sea + artificial introduction

 

Body mass: 30-60 kg
Antler: palmate, shed in April regrown by August

Coloration: white, menil, common, black
Why so diverse coloration? Species might have been going thorugh initial domestication.

 
 
Reproduction

Distinct male and female (+calves) herds
October: males move to common rut place
Each male defends and marks a small stand within place
Females approach rut place
Dominant males in middle copulate.
LEK in dense populations
Small populations: no lek, but defence of harem.
Variable: may start with lekking followed by harem holding

 

Lek polygyny (McElligot & Hayden, 2000, Behav. Ecol. Sociobiol.):
Males: only 10% mates
cca 3% gained 73% of all matings

See more on male-male competiton, antler evolution in Concepts