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Mysteries of the Deep: Tracking Whale Journeys After Death

July 9, 2024
in Science
Mysteries of the Deep: Tracking Whale Journeys After Death
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Beached Humpback Whale

A new study explores sustainable methods of handling whale strandings on the East Australian Coastline, focusing on offshore disposal. The study involved tracking a deceased humpback whale, which provided insights into predicting drift trajectories and preserving ecosystem benefits by preventing shoreline wash-up.

Research on sustainable whale disposal methods reveals effective offshore strategies that help maintain marine ecosystem balance by utilizing deceased whales, aiding in nutrient cycling and biodiversity.

The study involved tracking a deceased humpback whale, which offered insights into predicting drift trajectories and keeping the ecosystem benefits by preventing shoreline wash-up.

Sustainable Disposal of Whale Remains

A string of whale strandings on the East Australian Coastline and questions about the appropriate disposal methods for the remains have prompted a new study that highlights a sustainable, cultural, and ecosystem-beneficial offshore removal or decomposition.

Dr. Olaf Meynecke, from Griffith University’s Whales and Climate Research Program, led the case study, in which a 14m female humpback whale was found floating deceased – likely to due to a ship strike – in the coastal waters off Queensland’s Noosa Heads in July 2023.

The remains were intercepted before washing up on the shoreline, then repositioned 30 km (~20 miles) offshore and fitted with a satellite tag that tracked its position as it drifted with the wind and currents for 6 days before falling to the seabed.

Whale Remains Tiger Sharks

Whale remains being consumed by tiger sharks on the seabed. Credit: Laura Gourgas

Predictive Tracking and Ecological Impact

While Dr. Meynecke said it was always unfortunate to see these gentle giants deceased, the remains provided a first-ever scientific opportunity to test and develop a prediction method for the whale drift trajectory, allowing the whales’ nutrients to stay in the marine ecosystem and assisting authorities with decision-making.

“As we’ve seen more and more whales stranding on Australian beaches in past years, the effective, safe, and culturally sensitive removal of whale remains near or on public beaches has become a major issue,” he said.

“Our study shows that forecasting of where whale remains might end up when floating at sea is possible with surprisingly high accuracy.”

Disposal Methods and Challenges

There are seven known methods to remove the remains of washed-up whales from our beaches, the most common of all in Australia is to have them transferred to a landfill.

Other methods include transporting to a rendering facility for by-products, composting, burials, natural decomposition on the beach, sinking the remains, and using explosives to break the remains down – all of which can be costly, technically logistical, and can pose public health risks.

Benefits of Offshore Decomposition

Towing whale remains out to deeper waters, as in this pilot study led by Dr. Meynecke, has also been used in Australia and internationally previously, but not all these disposal methods were successful due to the remains drifting back to shore or interrupting shipping lanes.

Dr. Meynecke said these findings now provided an initial forecasting tool to predict where whale remains would drift, and would offer the additional benefit of retaining the nutrients from decomposition within the marine ecosystem. Scavengers such as tiger sharks also play a crucial role in breaking down whale remains quickly.

“Perished whales provide a substantial nutrient source for marine ecosystems, and strategically placing whale remains offshore can enhance nutrient cycling and foster biodiversity, contribute to carbon removal and marine floor enrichment for up to seven years,” Dr. Meynecke said.

“Their gradual decomposition sustains scavengers and detritivores, and supports microbial communities and deep-sea organisms.

“The best strategy for handling whale remains depends on multiple factors and should be decided on a case-by-case basis. Offshore disposal can be an ethical, cost-effective, and safe option if managed appropriately.

“By integrating scientific research and practical management strategies presented in our study, we can enhance our ability to predict and effectively manage the drift of whale remains, ensuring that ecological benefits are maximized while minimizing adverse impacts.”

Reference: “Dead on the beach? Predicting the drift of whale remains improves management for offshore disposal” 9 July 2024, Journal of Marine Science and Engineering.

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Copyright for syndicated content belongs to the linked Source : SciTechDaily – https://scitechdaily.com/mysteries-of-the-deep-tracking-whale-journeys-after-death/

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