Data Trawler - Survey Details

IN2024_V05    - is a Marine National Facility voyage

Title: Multi-year: Untangling the causes of change over 25 years in the southeast marine ecosystem - Voyage 3

Period: 2024-11-12 21:00 to 2024-12-12 08:00 UTC

Duration: 29.46 days

From: Hobart To: Hobart

Ship: Investigator (RV) [details]

Description: The marine waters of southeast Australia are one of a series of global ocean hotspots. Species abundances are changing. Many are shifting their distributions southward. Extreme events, such as marine heatwaves, are leading to additional impacts. In this hotspot lies the Australian Commonwealth Southeast Marine Park Network (SE-MPN). It is unclear whether ecosystem changes have also affected the marine parks, or whether the network has mitigated them. Also, in this hotspot lie important fisheries, providing the bulk of fresh fish to Melbourne and Sydney markets. Observations from the fisheries in the region over the past 20 years have indicated declines in abundance and commercial catch rates of several species. Stocks that were historically over-fished seem not to have recovered as expected, despite active fisheries management and a reduction in fishing effort. A recent review of the fisheries concluded that physical and ecosystem factors are likely to be affecting the main species, directly or indirectly. The last survey of the ecosystem was conducted 25 years ago. This project will repeat this survey to document changes in the ecosystem and establish a new biological and environmental baseline to help answer three broad questions: 1. How and why have fish assemblages and species abundances changed in the southeast ecosystem, and can the causes be mitigated? 2. How does this affect the multiple-use management of the region, particularly conservation and biodiversity management of Australian Marine Parks and the range of human activities in it? 3. What are the implications for marine spatial planning and adaptive management in the sectors that use the marine ecosystem? The survey is also testing new monitoring techniques including environmental DNA, and AI technology to detect and count seabirds. IN2024_V05 is the third of four monitoring surveys planned to help answer the above questions. For more details, please refer to the voyage documentation.

Leader: Little, Rich

Projects:

• Untangling the causes of change over 25 years in the southeast marine ecosystem [details] Primary

• Carbonate chemistry sampling in Bass Strait [details] Piggy-back

• FishSOOP Sensor Testing [details] Piggy-back

Marlin Metadata:-

Participants - on ship:-

This list includes those that may have only been on part of the voyage. See voyage reports on 'Reports and Maps' tab for details.

Marine National Facility Reports - plans, summaries and data processing

• IN2024_V05 Voyage Plan - includes objectives, investigator details, proposed data collection, voyage track and equipment to be used.

• View Survey map

Data publishing - No datasets have been published

Caveat: this event log was authored on the voyage using either a standalone logging system called ELOG or more recently an inhouse event logging tool called Everlog. For this reason, some positions are unknown and may be resolved using the logged time and the underway dataset for the voyage.

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