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  • 6th Form Open Evening 2019

  • Therfield School - KS4 Results - Press Release

  • Therfield School - KS5 Results - Press Release

  • GCSE Art Exhibition

  • Therfield Presents Alice in Wonderland

Year 12 Biology Field Days!

DAY 1: Tuesday 18th June

Seven Year 12 students went to Pagham Harbour and Selsey Beach to use a range of field sampling techniques to study the two areas.  They started by studying zonation on the salt water marsh at Pagham Harbour.  The Year 12s carried out a systematic sampling technique by laying a 100m transect tape from the footpath into the middle of the salt marsh.  Using this they recorded samples every 10m with either a frame quadrat (seen being used by the girls) or a point quadrat (seen being used by the boys).  Other than nearly losing a few wellies to the marsh, all went very well and some textbook data was skilfully collected.  Both groups were able to identify the red fescue, sea purslane and sea aster growth zones on the salt marsh.

After Pagham Salt Marsh we headed to Selsey Beach, a pebble beach that clearly shows the stages of succession of plants the further back from the shoreline you sample.  The Year 12s carried out a random sampling technique that is used to compare different sample areas.  They marked out two large areas and then randomly placed frame quadrats to estimate percentage cover of different plant species.

DAY 2: Wednesday 26th June

With six Year 12 students, we travelled to Newlands Corner to carry out two different field studies.  One on a grasshopper population (Chorthippus parallelus) and the other on the infestation of holly leaves by miners.  The students used sweep nets to catch as many grasshoppers as they could.  Christian gets the prize for catching the most.  They then had to paint a small green spot on the grasshoppers before releasing them again.  Later in the day we recaptured the grasshoppers and recorded the ratio of marked to unmarked.  This technique is called mark-release-recapture and is used to estimate population sizes for mobile species, in this instance, grasshoppers.  At Newlands Corner we also put on gardening gloves to collect bags full of holly leaves.  These were used to identify the various stages of the holly leaf miners (Phytomyza ilicis) food chain, by identifying tell-tell signs on the holly leaves.

From Newlands Corner we drove to two sampling points along the Tillingbourne River.  The river’s source is on Leith Hill, from here it flows through Wotton, Abinger, Shere and Shalford before it merges with the River Wey near Guildford.  The students used a wide range of sampling techniques to carry out a full river survey on the Tillingbourne.  This included using a new water sampling kit seen here in use by the boys.  The girls found and catch some minnows and we cheered on a homemade boats race between 30 plus kids from a local primary school!