Influence of temperature and nutrient supply on the biogeochemical function and diversity of ocean microbes

Investigating how ocean circulation in eastern Australia influences the diversity and function of microbial communities.
Voyage No

IN2016_V04

30 Aug, 2016

to

23 Sep, 2016

Sydney

to

Brisbane

Chief Scientist

Dr Martina Doblin

Institution

University of Technology Sydney

Voyage summary

Research voyage to the east coast of Australia to study ocean microbes.

Microbes drive ocean biogeochemical cycles and regulate Earth’s climate yet are poorly represented in ocean-climate models. This project will use state-of-the-art cell sorting and molecular analysis techniques to gain a deeper understanding of microbial diversity and nutrient utilisation in waters influenced by Australia’s warming and strengthening East Australia Current (EAC). This research will provide managers and industry with more accurate insight into the effects of ongoing ocean change on the delivery of essential ecosystem services in eastern Australian waters.

One supplementary project is included on this voyage:

  • Natural iron fertilisation of oceans around Australia: Linking terrestrial dust and bushfires to marine biogeochemistry (Dr Andrew Bowie, UTAS): Project to sample and conduct experiments on atmospheric particles containing terrestrial dust, bushfire smoke and anthropogenic emissions that are transported from Australia to its surrounding oceans.

Voyage blog:
Life in the EAC - Investigator voyage highlights

To help tell the story of our most recent voyage, we were joined by a guest writer on board RV Investigator, April Abbott from Macquarie University. On this voyage, April led a sediment coring project to measure the chemical composition of sediments off eastern Australia.

After a busy time at sea, April gives us her highlight reel from the trip.

Read more on CSIROscope
A squid with green eyes

Voyage impact

This voyage has provided a better understanding of the composition of microbes in relation to natural gradients of temperature and nutrients, and how microbes adapted to warm tropical conditions in north-eastern Australian waters change in structure or function as they are transported southward into temperate regions.

Zooplankton were found to be more abundant in cool water, including cyclonic eddies, and that these oceanographic features influence in the development of commercially important fish. Data collected will help to better understand this critical foodweb link. A program of research was also commenced that includes exploring the ocean microbiome, and understanding the links between oceanography and the marine foodweb, including larger consumers such as penguins.

Primary ocean productivity was mapped at unprecedented spatial resolution. Seafloor surveys during the voyage identified previously unknown underwater mountains and accurately determined the location of a shallow reef south of Montague Island.

Research resulting from this voyage will provide managers and industry with more accurate insight into the effects of ongoing climate change on the delivery of ecosystem services in eastern Australian waters. This information is essential to safeguard the biodiversity of our oceans, as well as the food and livelihoods of the people that depend on them.