Pyrophilic Plants Respond to Postfire Soil Conditions in a Frequently Burned Longleaf Pine Savanna.

AbstractFire-plant feedbacks engineer recurrent fires in pyrophilic ecosystems like savannas. The mechanisms sustaining these feedbacks may be related to plant adaptations that trigger rapid responses to fire's effects on soil. Plants adapted for high fire frequencies should quickly regrow, flower, and produce seeds that mature rapidly and disperse postfire. We hypothesized that the offspring of such plants would germinate and grow rapidly, responding to fire-generated changes in soil nutrients and biota. We conducted an experiment using longleaf pine savanna plants that were paired on the basis of differences in reproduction and survival under annual ("more" pyrophilic) versus less frequent ("less" pyrophilic) fire regimes. Seeds were planted in different soil inoculations from experimental fires of varying severity. The more pyrophilic species displayed high germination rates followed by species-specific rapid growth responses to soil location and fire severity effects on soils. In contrast, the less pyrophilic species had lower germination rates that were not responsive to soil treatments. This suggests that rapid germination and growth constitute adaptations to frequent fires and that plants respond differently to fire severity effects on soil abiotic factors and microbes. Furthermore, variable plant responses to postfire soils may influence plant community diversity and fire-fuel feedbacks in pyrophilic ecosystems.

Supracondylar fractures of the humerus in children: is departmental documentation hitting national standards?

BACKGROUND/AIMS: The British Orthopaedic Association's Standards for Trauma for the management of supracondylar humerus fractures in children specify that: 'A documented assessment of the limb, performed on presentation, must include the status of radial pulse, digital capillary refill time and the individual function of the radial, median (including anterior interosseous) and ulnar nerves.' METHODS: The documentation of cases of supracondylar humerus fractures over 1 year was retrospectively analysed. An electronic pro forma for supracondylar humerus fractures was introduced, with prompts for the pieces of documentation required to meet national standards. The use of this pro forma was audited after 6 months and 12 months use. RESULTS: Documentation ranged from 10% for anterior interosseous nerve to 53% for radial pulse. In the second reaudit, documentation ranged from 86% for anterior interosseous nerve to 95% for median nerve function. There were 17 patients for whom all documentation was present, and for these patients the pro forma had been used. Use of an electronic clerking pro forma improves adherence. CONCLUSIONS: Full documentation of neurovascular status in paediatric supracondylar fractures is vital to allow for effective preoperative and postoperative further assessment. With the move into paperless documentation, online pro formas can help clinicians with effective assessment and documentation.