ENR 3300 Exam 2 Questions and Answers
100% Solved
migration seasonal cycle of predictable movement. two way movement.
migration evolved independently in many groups - utilization of seasonal environments
- increased reproductive output
lake erie = migratory... barrier
migratory amphibians short distances to and from aquatic breeding areas, salamanders
migratory reptiles marine turtles, snakes
migratory mammals wildebeest in kenya and tanzania. precipitation driven
migratory fish salmon
,management challenges for migratory species - connectivity may still be important
depending on movement method of organism
- often requires international cooperation (migratory bird treat act, CITES)
- management and protection of multiple habitats (wintering, breeding, migratory stopover areas)
metapopulation a set of subpopulations each of which can persist for long periods, but
can also go extinct, and be reconolinized
amazon floodplain is an example of metapopulation
a network of habitat patches must meet three basic conditions 1. local populations inhabit
discrete patches
2. asynchronous dynamics between the local populations
3. habitat patches are not too isolated to prevent dispersal
for a population to persist... birth rate (b) > death rate (d)
immigration > emigration
,a metapopulation persists if recolonization rate (m) > extinction rate (e)
metapopulation assumes that all patches are equal in m and e
Equal probability in going extinct / being recolonized
source-sink metapopulation (quality) quality of patches differ, extinction rates differ
source metapopulation higher quality patches with r > 0, low e
sources produce excess individuals
sink metapopulation lower quality patches with r < 0, higher e
sinks decline to extinction unless supplied with migrants from sources
mainland-island metapopulation size
mainland larger patches, supply excess individuals to island
, island smaller patches, maintained by migration from mainland. decline to extinction
unless supplied with migrants from mainlands
how might drought and dams affect connectivity and metapopulation structure of fisheries in the
amazon? Drought and dams threaten habitat connectivity in the Amazon which is an
important part of metapopulations.
Connectivity decreases -> Recolonization decreases -> extinction
what solution has been proposed by Hurd et al. (2016) to protect and manage fisheries in the
Amazon? What do you think about it? Create freshwater protected areas (Pas) to conserve
the floodplain fish populations and protect biodiversity
if K > N the population is growing
if K < N the population is shrinking
if K = N the population will remain the same over time
100% Solved
migration seasonal cycle of predictable movement. two way movement.
migration evolved independently in many groups - utilization of seasonal environments
- increased reproductive output
lake erie = migratory... barrier
migratory amphibians short distances to and from aquatic breeding areas, salamanders
migratory reptiles marine turtles, snakes
migratory mammals wildebeest in kenya and tanzania. precipitation driven
migratory fish salmon
,management challenges for migratory species - connectivity may still be important
depending on movement method of organism
- often requires international cooperation (migratory bird treat act, CITES)
- management and protection of multiple habitats (wintering, breeding, migratory stopover areas)
metapopulation a set of subpopulations each of which can persist for long periods, but
can also go extinct, and be reconolinized
amazon floodplain is an example of metapopulation
a network of habitat patches must meet three basic conditions 1. local populations inhabit
discrete patches
2. asynchronous dynamics between the local populations
3. habitat patches are not too isolated to prevent dispersal
for a population to persist... birth rate (b) > death rate (d)
immigration > emigration
,a metapopulation persists if recolonization rate (m) > extinction rate (e)
metapopulation assumes that all patches are equal in m and e
Equal probability in going extinct / being recolonized
source-sink metapopulation (quality) quality of patches differ, extinction rates differ
source metapopulation higher quality patches with r > 0, low e
sources produce excess individuals
sink metapopulation lower quality patches with r < 0, higher e
sinks decline to extinction unless supplied with migrants from sources
mainland-island metapopulation size
mainland larger patches, supply excess individuals to island
, island smaller patches, maintained by migration from mainland. decline to extinction
unless supplied with migrants from mainlands
how might drought and dams affect connectivity and metapopulation structure of fisheries in the
amazon? Drought and dams threaten habitat connectivity in the Amazon which is an
important part of metapopulations.
Connectivity decreases -> Recolonization decreases -> extinction
what solution has been proposed by Hurd et al. (2016) to protect and manage fisheries in the
Amazon? What do you think about it? Create freshwater protected areas (Pas) to conserve
the floodplain fish populations and protect biodiversity
if K > N the population is growing
if K < N the population is shrinking
if K = N the population will remain the same over time
