Field Trip to Bogil Hole No

No.09 Field trip to Bogil Hole

Come prepared to college preferable light weight waterproofs (trousers and coat) As can get very wet and can be cold Either water proof foot wear but may be difficult walking on rocks on beach, perhaps better to except will get feet wet so wear old pliable shoes and have clean shock and shoes on coach. If warm day Sun lotion as beach can be deceptive or stay covered up.

Collect equipment put out at college before setting off on coach

Follow teachers onto beach and starting point then follow instructions.

Aim is to complete a line transect running up the shore and lying roughly right angles to the lines of high and low water. The organisms are to be examined at a series of stations located at 0.5m vertical intervals, at each station the fauna and flora is identified, abundance assessed and recorded.

1. Choose a section of the shore with a fairly regular slope avoiding patches of sand, large pools, high outcrops of rock and other disruptive feature.

The transect should run from low water as far up the shore as the highest marine organism.

Start at low

Succeeding stations are established at 0.5 m vertical intervals. A simple way of doing this is to use a pair of canes 1m and 1.5m long. The longer cane is held upright on the lower station and the shorter one is taken up the shore along the line of transect until when it is stood upright top of the 2 canes are in line with the horizon.

The horizon ------

Station 2.

Station one Study the area for 2.or 3 M either side of the station marker and halfway vertically to the next station above and below.

Place the quad down and record no. Of each species in area use scale over leaf

(Ignore organism in pools, gullies, crevices, under boulders or on landward facing slopes)

Record distance between each station. Later Present the results as a kite diagram

Draw a profile.

How to estimate the abundance of common plants and animals of rocky shores

A= abundance C= Common F= frequent 0=Occassional R=Rare N= absent

Sea weed (algae)

A= more than 30% cover C= 5-30% cover F= less than 5% cover ,Zone still apparent 0= Scattered plants, zone indistinct R=less than one plant or small patch per square decameter

Barnacles

A =more than 1 per square centimetre C= 10- 100 per square decimetre F= 1-10 per “ “ “ O =10 -100per square meter R =less than 10 per square metre.

Limpets and winkles

A= more than 50 per square metre C =10-50 per square metre F= 1-10 per square metre 0= 1-10 per square decametre R= less than 1 per square decemetre

Topshells, anemones, dogwhelks

A= more than 10 per square metre C=1-10 per square metre F= less than 1 per square metre, locally more O= always less than1 per square metre R= less than 1 per square decametre

Mussels A= more than 20% cover C =larger patches forming less than 20% cover F =Scattered in small patches O =Scattered, forming no patches R =less than 1 per square metre