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Julie Hatcher - The Essential Guide to Rockpooling

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The Essential Guide to Rockpooling
Author:
Julie Hatcher / Steve Trewhella
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The Essential Guide to Rockpooling: summary, description and annotation

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The marine environment is a remarkable place - otherworldly and a source of endless fascination. The rocky shore where land meets sea, its array of life ever-changing with the tides, offers us a chance to explore this hidden world.This book reveals the astonishing diversity of wildlife on rocky shores and in the rockpools around the coast of Britain and gives readers a greater under-standing of the myriad creatures that can be found using a bit of simple detective work.Rockpooling is an activity enjoyed by children and adults alike. This guide will make your exploration even more rewarding, whether you are enjoying a day out at the seaside or seeking to expand your knowledge of a unique habitat. Detailed descriptions of around 400 common and rare rocky shore speciesClear colour photographs of all the species describedTips and techniques describing how to find the more cryptic animalsIdeas for rockpool-related family activitiesInformation on threats to the intertidal environmentMeasures we can all take to safeguard the future of our rocky shore wildlife

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The Essential Guide to

Rockpooling

Published in 2019 by

Wild Nature Press Ltd

Registered address

7 Sandy Court,

Ashleigh Way,

Plymouth

PL7 5JX

The rights of Julie Hatcher and Steve Trewhella to be identified as the authors of this work has

been asserted by them in accordance with the Copyright, Designs and Patents Act 1988.

or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording

or otherwise, without the prior permission of the publishers.

A CIP catalogue record for this book is available from the British Library.

ISBN 978-0-9955673-1-3

Printed and bound in Slovenia on behalf of Latitude Press

10 9 8 7 6 5 4 3 2 1

www.wildnaturepress.com

By the same authors

THE ESSENTIAL GUIDE TO BEACHCOMBING AND THE STRANDLINE

IN THE COMPANY OF SEAHORSES

The Essential Guide to

Rockpooling

Julie Hatcher and Steve Trewhella

Contents

Introduction

Introduction 7 Introduction

or most people, the marine environment is almost entirely inaccessible and

impossible to explore. It is an unfamiliar place but a source of endless fascination.

The rockpools and shore, where the land ends and the sea begins, offer us a

glimpse into this mysterious world. It is no wonder that rockpooling is a popular activity,

which we enjoy as children but do not outgrow as adults.

In this book we introduce the reader to the extraordinary diversity of wildlife that can

be found in rockpools and on rocky shores around the coast at low tide. Many people

will be familiar with the crabs and small fish found on trips to the seaside. Our aim is to

enhance this knowledge and create a better understanding of these animals and the

myriad others that can be found using a bit of simple detective work. We have included

a selection of activities that will add a new dimension to this popular pastime.

What are rockpools?

Rockpools are pools of seawater left behind when the tide retreats. The natural process

of coastal erosion results in the formation of hollows, gullies and crevices which trap

water and form microhabitats supporting a fascinating and diverse array of marine life.

Rockpools are dependent on the local geology and vary from soft, easily eroded chalk

pools to hard, granite exposures.

What is found there?

Rockpools are formed in areas of intertidal bedrock and the activity of rockpooling

necessarily includes the surrounding rocky seashore. This book encompasses the whole

experience of the rocky shore and explains why some creatures are found within the

rockpools while others survive on the surrounding rock. It is sometimes assumed that

the animals found in rockpools have been temporarily trapped, caught out by the

ebbing tide. While this may be the case for some species, for the majority, the rockpool

is their permanent home. Many are permanently attached, for example seaweed and

barnacles, and moving is not an option.

When is the best time for rockpooling?

Rockpools only appear as the tide recedes, so you will need to have a knowledge of tide

times. These vary around the coast and from day to day. As there is no point turning up

at the beach when the tide is in, a certain amount of planning is required. Tide times for

a particular area can be found either by buying a tide table, available from chandlers and

tackle shops, or by looking online.

Plan to visit as the tide is going out so you will have more time to explore, following

the tide down the shore. It is important to ensure you will not be cut off by the incoming

tide. Remember that the incoming tide will flood low-lying gullies and channels before

it reaches higher ground, so plan your retreat carefully. As the tide varies each day

throughout the lunar cycle you should be aware of the difference between spring and

neap tides. The lowest part of the shore, home to the widest variety of marine life, is only

uncovered during spring tides.

new moon first-quarter moon

neap tides

full moon last-quarter moon

sun

moon

earth

neap tidal range

spring tidal range

high spring tide

high neap tide

low neap tide

mean tidal level

low spring tide

spring tides

LUNAR CYCLE

last-quarter moon

1day 2 3 5 6 74 8 9 11 13 14 1512 16 17 18 20 21 2219 23 24 25 27 2826

8 Introduction 8 Introduction

Tides

Tides are governed by the moon and sun and their relative position to the Earth. At

times of new and full moon, when the Earth, sun and moon are all in alignment and their

gravitational pull on the ocean is combined, the tidal range is larger, which means the

low tide is lower and the high tide reaches higher up the shore. These are called spring

tides. At times of half-moon, the moon and sun form right angles with the Earth so that

the gravity of the moon and sun are pulling in opposing directions. The result is a smaller

tidal range with a not-so-low low tide and not-so-high high tide on the shore. These are

neap tides.

The returning tide brings relief to creatures of the intertidal zone

Introduction 9 Introduction

The tidal range the maximum vertical height between high and low tide varies

around the country, with some locations experiencing large tidal ranges of up to

15m and others very small tidal ranges of just 2 to 3m. This variation is caused by the

topography of the seabed and coastline which may restrict the normal flow of the tide,

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