Desmosomes

Function- Strength, durability, signaling

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#XL - T Zoology

Density-independent factors limit population size regardless of the population’s density.

Common density-independent factors include natural disasters such as tornadoes, hurricanes, floods, and fires.

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#XL - T Zoology

Density-dependent factors affect population size in relation to the population’s density.

Density-dependent factors down into two categories. 

Negative density dependence 

Positive density dependence (inverse density dependence

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#XL - T Zoology

Life History Strategies Incorporate Traits Relating to Survival and Competitive Ability.

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#XL - T Zoology

Age at first reproduction

Earlier age →  Later age 

Clutch size

Large clutch size → small clutch size

Small size →  Large size

Trade off

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#XL - T Zoology

Reproductive strategies

1.Semelparity

2.Iteroparity

Semelparity - When organisms reproduce only once during their life

Ex- insects, other invertebrates, and occurs in organisms such as salmon, bamboo grasses, and agave plants

Iteroparity - When organisms reproduce multiple times during their life.

It is common in most vertebrates and perennial plants, such as trees

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#XL - T Zoology

Iteroparity - Repeated reproduction at intervals throughout the life cycle. It is common in most vertebrates and perennial plants, such as trees