BIO3021 Final: BIO3021 Summary Notes
25 May 2018
School
Department
Course
Professor
BIO-3021 NOTES
Semester 1
Exam Styles (2.5 hours)
• 50%
• Theory Exam: 5 answers (~30 mins per question)
o Dustin Marshall
! 1 question comprising of 3-part short answer question
o John Beardall
! 4 options: answer 2 questions
o Richard Reina
! 4 options: answer 2 questions
UNIT Objectives
• Describe the diversity and ecological importance of marine life
• Explain the fundamental physiochemical and physiological processes
underlying the productivity of marine environments
• Explain the ecological dynamics of marine ecosystems
• Discuss the impact of human activity on the sustainability of marine
ecosystems
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Dustin Marshall
Lecture 3 – Introduction to Marine Ecology and Marine Life-Histories
Marine Ecology
• Coastal marine organisms – interact most with
• Planktonic and benthic stage
Why it’s Different (today)
• Physical medium
o Density of sea water
o Developmental medium
o Dispersive larval stages (long distance)
o Freshwater – lower osmotic so have to regulate balance
Marine Life-Histories
• Marine life cycle
o Development " colonisation " survival and growth " fertilisation
Marine Ecological Processes
• Ecological consequences
o Dispersal distances can be much greater and more variable in marine
systems than in terrestrial systems *EXAM
! Mean and spread greater: km (log scale)
o Seaweed: short dispersal distances
o Invertebrates shows biggest range: hardly anything to very large
! Every kind - Most developmental variation
o Fish: higher end (km) big dispersal distances
• Demographically ‘Open’ Populations
o Populations demographically connected
o All larvae leave and ones that come back are from elsewhere
o Populations resilient to disturbance
• Source-sink dynamics
o Act as sources: produce a lot and can supply population
o Sink: no one comes out demographically
! Receives individuals but doesn’t produce any new ones itself
Population Genetics
• Populations separated by large distances tend to be different
o Genetics are the same – all populations are connected
• Very little differentiation among nearby populations in neutral markers
• Dispersal has consequences
Management consequences
• Fisheries management
o Prevent people from taking wrong type of fish
• Marine protected areas (MPA)
o Not allowed to do any bad stuff
o Need to be large enough to cover great area of dispersal
! Ideal 10 km from eachother networks
• Do MPAs work?
Document Summary
Exam styles (2. 5 hours: 50, theory exam: 5 answers (~30 mins per question, dustin marshall. 1 question comprising of 3-part short answer question: john beardall. 4 options: answer 2 questions: richard reina. Lecture 3 introduction to marine ecology and marine life-histories. Marine ecology: coastal marine organisms interact most with, planktonic and benthic stage. Why it"s different (today: physical medium, density of sea water, developmental medium, dispersive larval stages (long distance, freshwater lower osmotic so have to regulate balance. Marine life-histories: marine life cycle, development colonisation survival and growth fertilisation. Marine ecological processes: ecological consequences, dispersal distances can be much greater and more variable in marine systems than in terrestrial systems *exam. Mean and spread greater: km (log scale: seaweed: short dispersal distances, invertebrates shows biggest range: hardly anything to very large. Receives individuals but doesn"t produce any new ones itself.
