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TOAD LIFT 1999 REPORT

APPENDICES

 

APPENDIX 1: JUVENILE MIGRATIONS


The report 'Toads On Roads, In Car Parks and Down Drains' was produced in 1998 by Marcus and Susan Phillips. As a result of this, in early 1999 a toad lift was organised and a subsequent 1999 report produced. This text forms Appendix 1 of the 1999 report and concentrates on the monitoring and rescue of amphibians produced from spawn laid during the period February to April 1999.


ABSTRACT
The disruption to froglet and toadlet migration routes caused by roads and drains can greatly influence the outcome of a successful spawning. This appendix summarises the findings of a detailed study on the migration of amphibians produced from spawn laid during the period February to April 1999.

INTRODUCTION
The spawning site is a balancing pond at 'Saxon Gate'; a new housing development just off the Al at Biggleswade in Bedfordshire. Until 1990 the whole area formed part of Kennel Farm and was 'arable desert' i.e. intensively farmed arable land and allotments inimical to most wild life. There were, however, ditches with adjoining scrub, the remains of an old moat and a pond whose area was given on the map as 0.3 acres (0.12 hectares). The construction of a housing estate began in 1992 but was slightly delayed when a medieval village was revealed on the site. In 1993 a circular 'balancing pond' approximately 50 metres across was dug on the site of (or close to) the pond to take surface run off. We noticed a few toad tadpoles there in the spring of 1994. Since this pond is steeply shelved it was fenced off with metal railings. This did not stop quantities of refuse being dumped in it. Some shrubs have been planted alongside which are regularly sprayed with glyphosate ("Roundup"). An indoor swimming pool and car park was built in 1996 to the north of the pond. Raised flower beds, also sprayed, are a feature of the car park.

The pond is bounded by roads on the south, east and west which function as access roads to residential areas, to a new housing development and to the swimming pool car park. A boundary hedgerow running north to south has been retained. To the east of this is the new road. A toad tunnel has been constructed at the southern end of the new road (Refer to Figure 1). Building is continuing to the north and a linear wood some 45 metres deep will be planted to the east alongside the new road.

The new road was laid towards the end of the adult migration in April. The road was not opened to traffic and thus provided an opportunity for detailed monitoring of the juvenile migration. The road's high kerb stones and  26 gulley pot drains provided an ideal combination for pitfall traps. Laying of the toad tunnel did not interfere with the juvenile migration.

The main toad lift recorded 2500 amphibians rescued between late February and May. The metamorph lift commenced in June and finished in July. Over 14,000 froglets and toadlets were rescued from the site, 8000 were collected from the drains on the new road. Detailed records were kept of where and when metamorphs were rescued. These records have revealed a great deal about juvenile migration away from the spawning site.

GENERAL OBSERVATIONS
Froglets and toadlets are good climbers up the sides of wet buckets. We were constantly having to force them to go to the bottom and start again. Many were seen consistently trying to climb up the sides of drains.

The juvenile migration commenced with movement of froglets observed on 6th June. Froglets appeared to wander around the banks of the pond most of the time, only moving away during and after rainy weather. Froglet activity peaked after the 11th of June, approximately 3.5 months after the start of the adult migration.

Prior to commencement of the main toadlet migration, signs were put up in the swimming pool building asking the public to contact the IWG if large numbers of baby frogs and toads were seen trying to cross roads.

 
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