David López-Idiáquez

@davididiaquez.bsky.social

354 Followers 299 Following

Behavioural and Evolutionary Ecologist at the Edward Grey Institute of Field Ornithology. Expect science, wildlife pictures and bike stuff (but not in that particular order). davididiaquez.wixsite.com/zurrimicle

Temperature anomalies in May in Wytham Woods between 2023 and 2026. Each line represents the temperature departure from the 4-year mean each hour. In orange, we can see 2026 temperatures which between the 23rd and 28th of May were 8.11º C higher on average than the mean of the 2023-2025 period (representing a difference of 2.6 standard deviations). Data comes from 8 thermologgers. Thick lines represent the average of these 8 loggers and thin lines temperature from each individual logger.
2024 cohort of fieldworker in Wytham Woods (c) K. McMahon
Relationship between the temperature experienced by each brood at laying and their synchrony with the peak of food availability. Lines represent the trends predicted by the model before and after the temperature that minimises mismatch (black dot). Big green dots represent the mean raw abs. mismatch in temperature bins of 1 degree. The small green dot the mean temperature experienced by the tits during laying. Results from this model were obtained following an approach similar to the figure showing the links between temperature and reproductive success.
Links between the temperature experience by each brood at egg-laying (one of the relative periods) and four metrics of breeding success, clutch size (A), number of fledglings (B), fledging success (C) and number of recruits (D). Lines represent the trends predicted by the models before and after the peak (black dot), and the green big dots mean breeding success in temperature bins of 1 degree ± one standard deviation. The (small) green and black dots on the top of the each plot represent the temperature that maximised reproductive success (black) and the mean temperature experienced by the population at egg-laying (green). The temperature value that maximises reproductive success (black dot) of obtained from a model fitting non-linear associations between temperature and breeding success, while the trends after and before this temperature were obtained by fitting linear models between temperature and reproductive success.
Plot representing the slopes of the temporal trends in temperature using different time intervals. First, the grey dot shows that temperature in Wytham Woods has increased at a rate of ~0.032 degrees per year (1.88 degrees in the whole time series) when using a fixed time interval between the 15th of February and June 5th. The coloured dots represent the temperature change in 5 time intervals relative to individual broods corresponding to relevant reproductive stages for the birds (egg-laying, incubation, and the hatching, nestling and fledgling periods of the chicks). In those the slopes of temperature change are non-significant and close to 0, showing that temperature in those periods has not shown any significant temporal trends. (For more information see the main text)
Temporal trends in adult great tit body mass showing a decrease in mass at the population level and an increase in mass with year within each cohort
Great tit flying away after being ringed in Wytham Woods
Association between nestling mass and great (C) and blue tit numbers (D). The line and ribbon represent the trends predicted by the model and the dots and whiskers the mean ± 1 standard deviation of the raw data in bins of 20 pairs. Density plots represent the distribution of number of blue and great tits in each analysis (and hence give information about the sample size).
Great tit from Wytham Woods
Decline in body mass in adult (left) and nestling great tits. In the nestling plot, the purple line represents all nestling and the green line those that recruited to the population as breeders. Their different slope suggest an increase in the strength of selection on nestling mass something confirmed in the MS by analysing the temporal trends in selection differentials (see link for further information)
Port Meadow from Wolvercote
Azud del rio Lobos before dawn
Skull of a badger found in Wytham woods
A fox in front of a brick wall in Marston, Oxford
mallard with a strange colour variation, potentially a hybrid.
Video taken with phone through scope of a kingfisher at Otmoor
Adult marsh tit feeding its brood in a natural cavity in Wytham Woods
Daily cycling routine during fieldwork
Map showing the tracks (yellow lights) followed to check my set of boxes (red dots) in Wytham Woods
Marsh tit breeding in a nest box. As opposed to the video above which describes a marsh tit leaving a natural cavity
Marsh tit leaving a natural cavity in Wytham woods
Blue tit incubating eggs in the nest with a ver long feather potentially of a buzzard.
Video of a badger in Wytham woods
Map depicting a track in Wytham woods
Nest box in Wytham Woods