Marine Life

Just keep swimming

This little critter is a limpet.  From the photo they may not look like the most exciting of creatures.  If you’ve ever been down to the coast and taken a look at them yourself… your opinion may not have changed.  They don’t seem to move around a lot, or do a lot.  Of course looks can be deceiving.  Under that shell is the limpet’s squishy body – and their big, muscular foot which, alongside a pretty amazing adhesive secretion, they use to cling onto rocks and other hard surfaces.  Anyone who has ever had a go at trying to get a limpet off a rock knows how good a grip they can have.  This fabulous foot isn’t just used to stop them from drying out when the tide leaves them exposed to the air, or keep pesky predators (or nosy humans) at bay.  Limpets are grazers, feeding on tiny algae on the surface of rocks with their raspy “tongue” (called a radula).  See that empty space behind the limpet in the photo?  That’s where it’s been grazing.  Once they have grazed an area they need to find more food.  That foot gets to work, and along moves the limpet, munching up all the algae in its path.  Some limpet species even appear to have a home – a particular crevice that they return to just before the tide will expose them to the air.

But this isn’t a post about how amazing limpets are.  This is a post about animal movements in the ocean.. Or at least 3 different types of animal movement.  Some of them move a lot further than you think.  Yes, even limpets.

Continue reading “Just keep swimming”

Conservation & Sustainable Management, Marine Life, PhD / Graduate School

Where the wild things roam: Dispersal, connectivity, marine protected areas, and my PhD project

 

In my last post I mentioned that I am starting a PhD.  I promised to tell you a little more about what my research will be looking at, so here we go!

The project outline

My research comes very broadly defined already – the work’s raison d’être if you like.  Here it is:

“Movement and dispersal connects marine populations, allowing restoration of depleted local populations by immigrants that renew genetic diversity. Although Canada’s Oceans Act prioritizes ‘linking Canada’s network of marine protected areas (MPA)’, connectivity has not weighed significantly in MPA network design in Canada. This study will optimize regional marine connectivity among protected areas in the Atlantic region by determining optimal locations for new MPAs and evaluating how commercially important species would be representative in the entire MPA network. To model species distribution based on larval dispersal, fishery pressure, and climate change, we will use 3-D ocean circulation models. Then, based on metapopulation theory, we will develop novel spatial network algorithms to optimise the number and spatial connectivity between MPAs under current and future scenarios of climate and fishery pressure that may alter larval supply”.

Sounds complex?  Yep, for me too. Continue reading “Where the wild things roam: Dispersal, connectivity, marine protected areas, and my PhD project”

Conservation & Sustainable Management, PhD / Graduate School, Science Communication

On being MIA – and what’s next

Hello my fellow readers

You may have noticed that I have been away for some time.  Some of you have even gotten in contact with me to find out why, and encourage me back – thank you!  Your words of kindness and encouragement were very much appreciated.  I honestly did not mean to disappear for so long, but I did get incredibly busy.  I thought I’d share with you all some of the questions I’ve been asked during my time away – and my responses! Continue reading “On being MIA – and what’s next”

Conservation & Sustainable Management

Protecting Kenya’s dolphin habitat

Marine protected areas (MPAs) are pretty nifty tools for marine conservation. You take an area, you give it a designations and (hopefully… but the reality can be quite different) you attach some regulations/legislation to remove harmful activities to whatever it is you are trying to protect inside the MPA and make efforts to rebuild and conserve this spot. The situation of picking an area to designate can become trickier when dealing with ocean wanderers – species that move around a lot, and over great distances. It is safe to say that it is politically unfeasible to designate one area big enough to encompass, for example the movement of sea turtles. Instead, sea turtles may find critical habitat – feeding areas or nesting beaches for instance, covered by an MPA. We can’t protect them everywhere, but we can build a case to protect them where we know they hang out in large numbers. Some species are a little less predictable – or we simply don’t know where their critical areas are. Take southern Kenya’s populations of Indo-Pacific bottlenose dolphins (Tursiops aduncus) for instance. Apparently these critters are the most abundant of the marine mammals in Kenya’s Kisite-Mpunguti MPA. Abundance does not mean we know much about them though. The species is listed as data deficient on the IUCN Red List. Continue reading “Protecting Kenya’s dolphin habitat”

Marine Life

Cool critter of the month: the chambered nautilus (Nautilus pompilius)

Phylum: Mollusca

Family: Nautilidae

Where do they live?
These ocean dwellers can be found throughout the Pacific and Indian Oceans.  As it turns out, there are two sub-species of (Nautilus pompilius).  Nautilus pompilius polpilius is the larger of the two subspecies.  These guys can be found in the Andaman Sea down to Western Australia in the Indian Ocean, and from southern Japan down to Northern Australia in the Pacific.  Nautilus pompilius suluensis has a much more restricted range, staying in the Sulu Sea between Malaysia and the Philippines.

Continue reading “Cool critter of the month: the chambered nautilus (Nautilus pompilius)”

Marine Life

With ever-warming waters, some European fish are on the move

We all have our favourite types of environment and weather.  Some love those warm, sunny days spent on a beach of golden sands.  Some love those rainy days in the forest, when everything glistens with the raindrops.  Some love nothing more than a cold crisp day in snowy mountains.  We humans are lucky.  We can not only survive but enjoy a wealth of different environmental conditions.  Many other species are not so adaptive.  In the oceans some creatures live in the seabed itself, others on top.  Some may stay in the water column dominated by a particular type of habitat like a kelp forest, whilst others roam into a variety of different locations throughout their lives.  Then there are the varying conditions of the ocean itself.  Some areas are generally calm whilst others may experience a lot of movement.  Salinity levels also vary, as does oxygen, as does temperature.  Actually temperature – as many a fisher will know – is a super important driver of species distribution.  There are a few reasons for this.  First, unlike us, most fish do not have the ability to control their own body temperature.  Their internal body temperature reflects that of the environment they are in.  The second primary reason relates to food.  If the major food of a fish – be it plant (phytoplankton) or animal – changes its abundance (how many) or its distribution (where it is), then the fish may follow. Continue reading “With ever-warming waters, some European fish are on the move”