The colony size and breeding success of Southern giant petrels (Macronectus giganteus) on Signy Island has been monitored annually since 1996. The data presented here includes the number of breeding pairs (occupied nests) and the number of chicks present in their nests prior to fledging. Breeding pairs and chicks are monitored by direct counts at nine sites on the west coast of the island. The nest surveys are undertaken from December to January, with chick counts completed in mid-March. This work was funded by Natural Environment Research Council (UK) core funding to the British Antarctic Survey.

The dataset consists of ACi (net CO2 assimilation rate, A, versus calculated substomatal CO2 concentration, Ci) curve data from an ozone experiment during which Trifolium repens and Lolium perenne were exposed as both monocultures and two-species mixtures to an episodic rural ozone regime in large, well-watered containers within solardomes for 12 weeks. Treatments were elevated ozone (AOT40 (Accumulated Ozone Threshold exposure of 40 parts per billion) of 12.86 ppm h) or control conditions (AOT40 of 0.02 ppm h). ACi curves were carried out mid-way and at the end of the exposure period using a Portable Photosynthesis System, CIRAS (PP-Systems) to calculate the photosynthetic parameters Jmax (maximum rate of photosynthetic electron transport) and Vcmax (maximum rate of Rubisco carboxylase activity). The observed decreases in photosynthetic efficiency and capacity in elevated ozone indicate that the ability of such ubiquitous vegetation to act as a sink for atmospheric carbon may be reduced in future climates. The experiment was carried out at the CEH Bangor Air Pollution Facility. This work was funded by the Centre for Ecology & Hydrology Integrating Fund Initiative. Full details about this dataset can be found at https://doi.org/10.5285/f14b9056-ccc0-4887-812e-c004f613a138

Data comprise bracken biomass, soil and bracken chemistry (for example mass, bulk density, pH, carbon, nitrogen and the concentration of a range of other elements) precipitation, percentage ground cover of plant species and site information. Samples were collected between 21st July and 6th August 2014 at 49 plots in the English lake district and Snowdonia in Wales. Plots were located in stands with minimum 80% bracken cover and which had not been trampled by grazing animals. The study was funded by the UK Natural Environment Research Council under the Macronutrient Cycling Research Programme, as part of the Long-Term, Large-Scale (LTLS) project (Grant no. NE/J011533/1), and by the University of Liverpool (Grant no. NE/J011630/1). Full details about this dataset can be found at https://doi.org/10.5285/5b89d8f3-86f0-431c-844f-eda5ddae9042