Applause, so im out rock balling today and i came across this magnificent wall now i know i am very short. I am only five foot, but still this is a very interesting wall, because we can look at the amazingness of how the sea affects where species grow in just over five feet. So this is into total zone. We can tell that because i am not yet underwater, but i will be in a couple of hours if i stay here and everything in the ocean and in the intertidal zone, water is key its key, how long theyre in water for because it all affects how You need to adapt now. I have a whole documentary on this, so go and check that out. If you want some longer lessons, however, for todays quick example, im going to show you just on this simple wall, how we can read the rocky shore and tell how long everything has been underwater. So this section here is right at the top of our wall, and that means its going to be out of the water for the longest. What we can see here is theres, not a lot of color and theres, not a lot of seaweed. What we do have are barnacles which are well adapted to live out of water for a long time, and we have a couple of limpets which again are extremely well adapted to living and drying out, because they just clamp down on the wall.

You cant get these off theyre so tightly attached that they are keeping their cells attached to the rock so that no water escapes their body and they can survive. But as we start to move down and a bit further, we start to notice these patches now. This is seaweed starting to grow. Seaweeds uh are very different. Each type of seaweed has different adaptations, so at the start we get some species that are adapted to surviving out of water like this teeny weeny little seaweeds here um, but as we go further down, we start to introduce new species. Now what really cant stand? Um drying out is often a lot of species that are red, seaweeds, and so you wont find so many red seaweeds youll find browns and potentially you will then start to find green seaweeds as well as we move slightly down well start to see more and more Color, this is more and more seaweeds being able to live in a zone where theres enough water for them to live theyre not having to adapt as much to living outside of water, and so more species can find a home. But as we get further down, more and more competition happens because more species are able to live there, and so more species are fighting for the real estate of the rock. We then start to hit things like mussels. Now mussels can close up, which means they can survive out of water for a long time but theyre not as well adapted as some of the other species, so theyre not found higher up.

This is also a species of muscle called modulus. You wont find bigger muscles. Sometimes you wont find them higher up on the shore, because they need a lot more time in water to survive. Now we start to work our way right down the wall and you may notice that a lot of this is the same. Its not so different. Youve got youve got the top zone, which is about that big and thats. Just a species really really adapted for the shore and then youve got this, which is all really the same. Now you can call this midshore. This is the midshaw where species are in this water for a bit theyre out of water for a bit theres adaptations needed, but you still cant live here if youre not adapted very well to live out of water, but youll notice a really stark change. All of a sudden here now this is what you can call low tide. We start to get some of the red seaweeds that i was talking about this stuff here. This pink stuff is crustose coraline algae. This is an algae that grows along the surface and forms a calcium carbonate skeleton a bit like coral. We also start to get some fabulous animals here. This is a an anemone loads of different, more green seaweeds. This is a red sea. We call bunny ears, and this is another red seaweed. Green seaweeds, limpets weve got lots of snails. This is a much more productive zone and lots more species that live here, because the water is literally here its only out of water for maybe an hour every day, and this here is kelp, and this is always found at the lowest of the low shore.

It marks the boundary really between an intertidal zone and a subtidal zone, so a zone will always stay in the water and you can tell that by the kelp beds. That start to form at the bottom. But whats interesting about this zone will be that theres. There will be a lot more species, but it will be a lot more competition. There isnt many gaps in the rock here where there are gaps its because limpets have been feeding and theres a lot of stuff going on here. Within you know, within the space of a few um weve got sponges, crosstalk, coral and algae. This is condis. Crispus weve got a type of mussel. Weve got another species of algae. Weve got kelp, weve got tubeworms, weve got sea lettuce, weve got an anemone uh. What else have we got? Weve got bryce owens growing on this piece here limpets. This is a type of fucus seaweed which can live here. This is another type of red seaweed, another anemone in the water there theres a lot of life only really in the space of you know, just this tiny area and thats, because its low tide and productive. So if the bottom of the shore is so productive, then why do we even have things growing in the midship and at the top of the shore well thats, because its so competitive down there that some species have decided? You know what would be easier for me to spend millions of years adapting two or hundreds of thousands of years adapting to move myself up a little bit and uh live out of the way of all of the hassle down here.

What we didnt find in that tiny section is also in the water. There are a lot more predators, lots of big fish and lots of scary crabs, so by living out of the water for half of your life, basically youre avoiding predators for half of your life. Unless the birds get you now, whats really cool about this wall, showing it with in the space of six foot. Is that usually you will see this same pattern but stretched out and across an entire shore? It could be. I dont know 50 60 100 meters between each of the zones. It could stretch back depending on what shore youre at, but when its were looking at this, like height vertically its really easy to see the clear and distinct differences that has been probably slightly over a five minute marine biology lesson. Please like and subscribe im your marine biology, sharing the weirdest and most wonderful sea creatures with you, but, more importantly, im sharing the species that you can find in just a pair of wellies, so that you can go out and experience the joys of nature. Yourself too. I post videos every single wednesday, so check back then and ill see you next week.

https://www.youtube.com/watch?v=-KFfKTjOumU