Conservation Flashcards
What factors can affect population growth
Birth and death rate, emigration, immigration
What is the equation for change in population size
Birth + immigrants - death + migrants
What is biotic potential
The maximum population growth rate possible with unlimited environmental resources
What is carrying capacity
The maximum number of individuals of a species that an environment can indefinitely support
What are the 2 population growth curves
Sigmoid (S) and J growth curve
Describe the S shaped growth curve
Looks like an S, Starts off with ideal conditions population growth is slow, then growth increases exponentially then growth slows again then a stationary phase is reached (carrying capacity)
Describe the J shaped growth curve
Looks like a J, period of slow growth, then exponential growth under ideal conditions
True or false there are 4 types of survivorship curves
False, there are 3
Which survivorship curve is this, graph represents a constant death rate, these organisms have few offspring and provide a lot of parental care
Type II survivorship curve
What organisms are a type I survivorship curve
Humans
Describe the type I survivorship curve
Death increases with old age, young organisms have a high chance of survival, small numbers of offspring and provide lots of parental care
What type of survivorship curve is this, high mortality rate amongst the young, organisms have lots of offspring but don’t provide much parental care
Type III survivorship curve
Which organisms are type III survivorship curves
Fish, trees and invertebrate
There are 2 types of species/population strategies, what are they
R-strategy and K-strategy
Which population strategy is this, they show a J population growth curve, rely on their fast reproductive rate as they have high mortality amongst the young ?
R- strategy
What are 3 differences between R and K strategy
K-strategy involves large individuals, longer life, fewer offspring with longer pregnancy periods, provide parental care, reproduce at a later age and slow maturity rate
What are big causes that lead to loss of biodiversity?
Habitat loss due to human activities, pollution of environment, climate change, introduction of a new species and poaching/hunting
What are the differences between in situ and ex situ conservation
In situ is preserving the organisms in their natural habitat e.g. national park. Ex situ is conservation outside of the organisms natural habitat e.g. botanical gardens
