Please help us keep orca habitats clean, quiet, and full of fish

by oceansadminAcoustics, Conservation, Habitat, Killer Whale Conservation, Ocean Noise, Populations, Protecting Species, WhalesPosted on No Comments

 

 

The critically endangered southern resident killer whale population now numbers 74 individuals. The ability of the population to recover is hindered by a perfect storm of threats—not enough salmon, too much noise, and toxic chemicals affecting calf survival—but lack of access to salmon is at the eye of that storm.

We need to recover Chinook salmon stocks throughout the whales’ range. 

We support all efforts to do so. We support dam removal, where this will get more salmon into the environment. We applaud the recent announcement to reduce salmon fishing quotas until the whales recovery, which will reduce our competition with the whales. While we wait for those measures to take effect, we need your help to give the whales a fighting chance to find as many of those salmon as possible in a noisy ocean.

We need to give the whales a quiet place to hunt for salmon

Our work has shown that killer whales spend 18-25% less time feeding on salmon when boats are around than when they are undisturbed. We have found that the southern resident killer whale population needs 662 big, fat Chinook salmon each day. We have found that mothers with calves need 43% more calories, more salmon, than adult females without calves.

A protected area can help the whales if we put it in the right place. 

We have found that killer whales are more vulnerable to disturbance when they are feeding than when they are travelling from A to B. They also need more salmon. We have identified areas that whales use preferentially for feeding. (One is called Salmon Bank. We have a feeling the whales knew this before people did.) We need to bring together all dedicated datasets we can use to identify areas where the whales are finding salmon, so we can prioritize those for protection. Protecting key feeding areas is essential to protecting the whales.

Please support our efforts to keep orca habitat clean, quiet, and full of fat, wild salmon.

PS Thanks to our team, especially Toby Hall, for the great footage, and to our friends at SeaLegacy for help editing this video.

Our Vision for Recovering Killer Whales: A Clean, Quiet Ocean Full of Salmon

by oceansadminAcoustics, Conservation, Exploration, Habitat, Human Impacts, Killer Whale Conservation, Ocean Noise, Protecting Species, Sustainable Fisheries, Wildlife Health, Women in SciencePosted on No Comments
Southern resident killer whales in Haro Strait. Photo by Toby Hall
Southern resident killer whales in Haro Strait. Photo by Toby Hall

Southern resident killer whales are in decline.  Our recent population viability analysis on southern resident killer whales predicted that, if threats remained constant, it should take several decades for the population to decline from 80 to 75 whales. In fact, that decline took only three years. We fear that the decline is accelerating, and we may be reaching a tipping point.

By studying killer whales from land, we can measure their responses to noise without adding the noise of a research boat to the equation. We use noninvasive techniques to measure swimming speeds, breathing rates, and other behavior. Our work on both northern and southern resident orca has shown us that the whales spend 18-25% less time feeding in the presence of boats than in their absence.

We recently joined an international, interdisciplinary study to understand the relative importance of the three main threats to recovery in the endangered killer whale population. The whales are facing a perfect storm of threats–not enough salmon, too much noise, and too many toxic chemicals in their bodies–but lack of prey is at the eye of the storm. This research shows it will take 30% more big, fatty, Chinook salmon than we’ve seen on average over the last 40 years for the population to reach our recovery goals. That will take time, but we have to start now. Meanwhile, reducing noise and disturbance can help make it a little bit easier for whales to find the salmon we have now. In the coming months, we will be revisiting our study on identifying critical foraging areas in the Salish Sea and strengthening their protection.

Counting and protecting Amazon river dolphins

by oceansadminConservation, Dolphins, Ecosystems, Habitat, PopulationsPosted on One Comment

Did you know two species of river ‪dolphin‬ live in the ‪Amazon‬? The pink one is called ‪boto‬, or Inia; the grey one is called ‪tucuxi‬, or Sotalia. Both are gorgeous, ancient species that have become adapted to live their entire lives in freshwater. They are also incredibly tough to spot in muddy waters, and have a cryptic behaviour that makes them difficult to count.

That’s a problem, because a key task in‪ ‎conservation‬ ‪science‬ is knowing whether a species is increasing or decreasing.

We partnered with scientists at Fundación Omacha, University of St Andrews & NOAA to survey river dolphins in a stretch of the Amazon at the border of‪ Colombia‬ & ‪Peru‬. Using some simple field methods [learn more about our small-boat survey toolkit here] & fairly sophisticated analytical methods, we found that tucuxi is likely to be stable or increasing, but boto are likely to be declining.

Our findings are worrisome, given reports from‪ Brazil‬ that there is a major problem with deliberate killing of boto for bait in a lucrative catfish fishery. Our next steps are to (a) continue surveys withFundación Omacha to improve our understanding of seasonal and annual trends; and (b) work with Dr Fernando Trujillo (founder of Omacha) to identify solutions. If poaching is the problem, we can work toward finding alternative sources of fish bait. Dr Trujillo points out that more than 150 major hydroelectric dams are proposed for Amazonia. These would fragment dolphin habitat, and our research shows that we have very low statistical power to detect declines — possibly until they become irreversible.

Want to learn more?

Please check out our video describing the project and showing the animals swimming through flooded rainforest (underwater footage courtesy BBC Natural History Unit).  Science Magazine wrote a news article describing our work — a first for our team.  And of course, let us know if you’d like to read the original, technical paper published in Biological Conservation. 

It’s a fish-eat-fish world: does noise affect them?

by oceansadminAcoustics, Ecosystems, Habitat, Ocean Noise, Women in SciencePosted on 3 Comments

We’re so grateful for this week’s special guest post from Inge van der Knaap, a Erasmus Mundus Master’s student in Marine Biodiversity and Conservation. Inge and her assistant, Sofya Reger, recently completed a beautiful experiment on noise and fish in collaboration with Salmon Coast Field Station.  Inge produced a great video introducing people to her study.  We’ll post it here, with her description and some photos below.  Let us know what you think!  And many, many thanks to those of you who donated to our charity to support this work.  

 

Inge’s guest post:

Noise pollution is a relatively new topic in marine sciences. Little is known about the impact of underwater noise on marine life, while the number of ships travelling the seas still increases every year. This might not seem of major concern since our oceans are large and take up more than 70% of the planet’s surface; however noise travels 5 times faster and further in water than in air!
In a busy shipping area like the Strait of Georgia, where thousands of cargo ships pass through every year, the underwater noise production will have consequences for the marine life. This will become an even bigger concern in relation to proposed increase in tanker traffic to and from the port of Vancouver.

Many marine species are vocal and rely on their auditory senses to locate their prey. Numerous studies have investigated the effect of boat noise on cetaceans; however, effects on the largest group of marine vertebra; the fish, has not been studied much yet. In the quiet surroundings of the Broughton Archipelago myself, Inge van der Knaap (a marine conservation master’s student) and Soyna Reger (an undergrad biology student) have conducted a pilot study designed to investigate the effect of boat noise on the behaviour of a Pacific salmon and herring, and a rockfish species:  fish species of ecological, cultural and economic value.

This pilot study was done during the summer of 2014 at the Salmon Coast field station under the supervision of Dr Rob Williams, of Oceans Initiative. Soyna and I collected the fish with the help of the experienced Salmon Coast staff and local people living around the area. We made sure that the fish were not harmed during the collection and all of them were released after our study was completed.
The fish where held inside large net pens and their behaviour was monitored using underwater camera’s. The noise was produced by a small motor boats passing the nets at different speeds and distances and noise levels in the net pens were recorded with a hydrophone (provided by David Hannay of JASCO Applied sciences).

The analysis of the data is still ongoing as part of my master thesis dissertation, which will be finishing in June this year. The results will hopefully give us an indication of the impact vessel noise can have on different fish species and provide a baseline for future studies in this area.

Inge and Sofya

 

Saving the whales by saving their habitat

by oceansadminHabitat, Human Impacts, Killer Whale Conservation, Ocean Noise, WhalesPosted on No Comments
3rd International Conference on Marine Mammal Protected Areas
3rd International Conference on Marine Mammal Protected Areas

It’s not rocket science. Much of the work we do involves conserving whale & dolphin populations by identifying the habitats most critical to their survival, and keeping the habitat quiet, and full of fish.

We’ve published extensively on the value of Marine Protected Areas to survival of endangered killer whale populations.  This week, we’re thrilled to participate in the 3rd International Conference on Marine Mammal Protected Areas in Adelaide.  Rob is chairing a workshop on extreme challenges in marine mammal conservation, when critical habitats occur in heavily industrialized coastlines.

This is a topic that consumes much of our time, because the killer whales we study live in habitats that have noisy shipping lanes running through them.  The dolphins and humpback whales generally live in quieter habitats in BC, but few laws exist to keep the habitat quiet, and proposed industrial activities have the potential to make quiet habitats noisy.

Thanks so much for your support for our charity.  We couldn’t do this work without your support.  If you like the work we do, please share our work through your social networks, or consider making a donation.