Beached fledglings have heavier plastic loads than do road-killed fledglings in the Short-tailed Shearwater

Airam Rodríguez (Conservation Department, Phillip Island Nature Parks, Cowes, Victoria, Australia) and colleagues have published in the journal Environmental Pollution on plastic pollution in the Short-tailed Shearwater Ardenna tenuirostris (Least Concern)

The paper’s abstract follows:

“Despite the increase of literature on seabird plastic ingestion in recent years, few studies have assessed how plastic loads vary according to different sampling methods. Most studies use necropsies of seabirds with a natural cause of death, e.g. beached or predated [sic], to determine plastic loads and monitor marine debris. Sampling naturally dead seabirds may be biased as they have perished because of their intrinsic factors, e.g. poor body condition, high parasite loads, sickness or predation, affecting estimates of plastic loads. However, seabirds killed accidentally may be more representative of the population. Here, we used the short-tailed shearwater Ardenna tenuirostris to test different sampling methods: naturally beached fledglings and accidentally road-killed fledglings after being attracted and grounded by artificial lights. We compared plastic load, body condition, and feeding strategies (through using feathers’ δ¹³C and δ¹⁵N isotope niche) between beached and road-killed fledglings. Beached birds showed higher plastic loads, poorer body condition and reduced isotopic variability, suggesting that this group is not a representative subsample of the whole cohort of the fledgling population. Our results might have implications for long-term monitoring programs of seabird plastic ingestion. Monitoring plastic debris through beached birds could overestimate plastic ingestion by the entire population. We encourage the establishment of refined monitoring programs using fledglings grounded by light pollution if available. These samples focus on known cohorts from the same population. The fledgling plastic loads are transferred from parents during parental feeding, accumulating during the chick-rearing period. Thus, these fledglings provide a higher and valuable temporal resolution, which is more useful and informative than unknown life history of beached birds.”

Short-tailed Shearwater at sea, photograph by Kirk Zufelt

Reference:

Rodríguez, A., Ramírez, F., Carrasco, M.N. & Chiaradia, A. 2018.  Seabird plastic ingestion differs among collection methods: examples from the short-tailed shearwater.  Environmental Pollution 243B: 1750-1757.

John Cooper, AAP Information Officer, 13 November 2018