Professor Dustin Marshall
Prior to working at Monash University, Dustin was at the University of Queensland, after a post-doctorate at the University of New South Wales and brief research stints at the Oregon Institute of Marine Biology.
Dustin is an editor of three journals — Ecology Letters, Functional Ecology and Evolution — and Deputy Editor-in-Chief of Oikos.
Dustin has published more than 100 scientific publications.
I am interested in variation, be it genetic or phenotypic, and how that variation affects the evolution and ecology of marine organisms.
My original research focus was on marine life-histories, specifically how phenotypic links among life-history stages affect the population dynamics of marine populations.
Since then, my interests have spread to include using quantitative genetics approaches to understand the limits of adaptation in marine organisms and the evolution of life histories.
I’ve become interested in how evolutionary processes affect the dynamics of marine communities as well how marine communities function more generally.
I think there are some unifying themes in our apparently disparate research programs, but I think it will take a few years for these threads to be drawn together. One thing that does unify the program already however is the study system — we focus almost entirely in sessile marine invertebrates. Specifically, we work on ‘fouling’ organisms, a term that covers the critters that grow on man-made structures in temperate coastal regions. This system is not particularly glamorous but is extremely tractable for asking ecological and evolutionary questions.
If you are interested in joining the lab, please email me.
Dr Robin Svensson (post-doctoral research fellow)
Much of my work has focused on tests of well-known hypotheses in these areas, such as the Intermediate Disturbance Hypothesis, the Dynamic Equilibrium Model and the Novel Weapons Hypothesis.
I primarily conduct manipulative field experiments in marine sessile systems, but I have also worked with bacterial communities and mathematical modelling.
Rolanda Lange (post-doctoral research fellow)
Environmental predictability, local adaptation, and phenotypic plasticity regulate connectivity in marine environments, which are often dominated by sessile organisms which propagate by planktonic larvae.
Both local adaptation and trans-generational plasticity can reduce an organisms ability to conquer novel habitats it is maladapted to.
I aim to understand the interplay of mechanisms that enable or hinder organisms to conquer new environments.
Diego Barneche (post-doctoral research fellow)
My research is focused on understanding how the relative importance of abiotic variables (temperature), properties of individuals (body size) and species (density) interplay to determine community energy flux.
I am combining a suite of mathematical and statistical models to test predictions of metabolic theories, which will be evaluated via lab experiments using sessile marine invertebrates.
Martino Malerba (post-doctoral research fellow)
In my experiments, I mostly grow phytoplankton species in laboratory conditions to test ecological and evolutionary theories. I have also worked with ecological modelling, bacteria, and reef fish.
My current project uses experiment evolution processes with phytoplankton species to test hypotheses about their physiological adaptation.
In my PhD, I used process-based quota models to investigate nitrogen utilisation in phytoplankton populations.
Giulia Ghedini (post-doctoral research fellow)
Currently, I am using communities of marine sessile invertebrates as model systems to test for the influence of individual size, population density and the abiotic environment in determining community use of resources.
In my PhD, I explored how individual responses to varying abiotic conditions can aggregate to generate compensatory dynamics that buffer community change and the extent to which such processes contribute to stability.
Amanda Pettersen (PhD candidate)
I am interested in life-history theory, particularly the evolution of offspring size.
The allocation of maternal energy reserves towards different reproductive strategies can pose significant consequences for the fitness of both mother and offspring.
My project integrates life-history theory with metabolic theory and tests previously unexplored mechanisms in order to explain common patterns observed regards to offspring size.
Karin Svanfeldt (PhD candidate)
Known for modular plants is that they use partial mortality as a way of recycling nutrients from less effective leaves (modules) to more profitable ones, which makes leaf lifespan possible to predetermine. Is a similar scenario also true for colonial marine invertebrates? In that case, can we predict at what time a particular zooid in a colony will die based on simple life history and environmental cues?
To answer these questions, I am estimating the isolated life history traits of the colonial marine bryozoan Watersipora subtorquata during laboratory trials, as well as monitoring the life spans of zooids planted in the field manipulated to various environments.
Hayley Cameron (PhD candidate)
Broadly, I am interested in the evolution of life-history strategies in marine invertebrates and seaweeds.
In particular, I am interested in the links between maternal phenotype, offspring size and offspring fitness.
The primary aim of my PhD research program is to investigate correlations between maternal size and offspring size, focusing on two specific questions:
- Why larger mothers might produce larger offspring
- Whether larger mothers produce higher quality offspring
Colin Olito (PhD candidate)
I study the metabolic costs of reproduction and the evolution of spawning strategies in externally fertilizing marine invertebrates with an emphasis on the the challenges associated with sperm dispersal in the sea.
Evatt Chirgwin (PhD candidate)
I am interested in how natural populations adapt to environmental change.
My PhD intends to investigate how marine invertebrate populations may respond to the predicted effects of future climate change through adaptive evolution and phenotypic plasticity.
Lukas Schuster (PhD candidate)
My main interests are the evolution and ecology of physiological traits in marine invertebrates. In particular, I am focusing on the resting metabolism of the arborescent marine bryozoan Bugula neritina.
It is well known that different species differ in their metabolic rate, but this variation in metabolism has also been repeatedly reported for individuals within the same species. The primary aim of my PhD research program is to investigate the eco-evolutionary consequences of such an intra-specific variation in metabolic rate, focusing on two specific questions:
- How does selection act on resting metabolic rate in different environments?
- How do intra-specific differences in resting metabolic rate affect population dynamics?
Annie Guillaume (Research Assistant)
For my honours, I manipulated both adult and offspring thermal environments to determine maternal and paternal effects on fertilisation and larval success in the marine polychaete Galeolaria caespitosa.
I am currently working on Ciona intestinalis to determine how changes in sperm temperatures alter offspring survival and performance.
Lucy Chapman (Research Assistant)
For my honours, I assessed the southern commercial scallop Pecten fumatus within Port Phillip Bay to determine whether the population had successfully adapted to the newly established predator, the invasive Northern Pacific sea star Asterias amurensis.
I am currently assisting with a diverse range of projects with the Marine Evolutionary Ecology Group including field and laboratory studies, and data bank collaborations.