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A quantitative analysis linking sea turtle mortality and plastic debris ingestion
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Researchers analyzed two datasets covering hundreds of sea turtles and found a quantitative link between the amount of plastic debris ingested and the probability of death. The study estimated that ingesting as few as 14 pieces of plastic significantly increases mortality risk, providing some of the first direct statistical evidence connecting plastic ingestion volume to lethal outcomes in marine turtles.
Plastic in the marine environment is a growing environmental issue. Sea turtles are at significant risk of ingesting plastic debris at all stages of their lifecycle with potentially lethal consequences. We tested the relationship between the amount of plastic a turtle has ingested and the likelihood of death, treating animals that died of known causes unrelated to plastic ingestion as a statistical control group. We utilized two datasets; one based on necropsies of 246 sea turtles and a second using 706 records extracted from a national strandings database. Animals dying of known causes unrelated to plastic ingestion had less plastic in their gut than those that died of either indeterminate causes or due to plastic ingestion directly (e.g. via gut impaction and perforation). We found a 50% probability of mortality once an animal had 14 pieces of plastic in its gut. Our results provide the critical link between recent estimates of plastic ingestion and the population effects of this environmental threat.
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Researchers analyzed over 10,000 necropsies of seabirds, marine mammals, and sea turtles to quantify the risk of death from swallowing large plastic debris. The study found that sea turtles faced the highest mortality rate at 4.4%, and the type of plastic mattered: rubber was most dangerous for seabirds, fishing debris for marine mammals, and soft plastics for sea turtles.
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Researchers developed a modeling approach to quantify how plastic ingestion affects the growth, reproduction, and population dynamics of marine wildlife, using loggerhead turtles as a test case. They found that having 3-25% plastics in digestive contents could reduce reproductive output by 10-88% compared to unaffected turtles. The study introduces a method for identifying ecological breakpoints where plastic pollution could cause population declines in affected species.
Plastic Ingestion in Post-hatchling Sea Turtles: Assessing a Major Threat in Florida Near Shore Waters
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Plastic fragments were found in the digestive tracts of 93% of stranded juvenile loggerhead sea turtles examined in Florida, with up to 287 fragments and a plastic-to-body weight ratio as high as 1.23%. The high ingestion rates in animals this young suggest that plastic pollution poses a serious threat to sea turtle survival from the earliest life stages.
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Researchers developed a standardized protocol for collecting and analyzing marine litter ingested by sea turtles, providing methodology for extracting and quantifying litter items from dead turtles to fulfill EU Marine Strategy Framework Directive requirements for assessing Good Environmental Status.
Association of ocean macroplastic debris with stranded sea turtles in the Central Gulf of Thailand
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Researchers retrospectively analyzed records of 388 stranded sea turtles in the Central Gulf of Thailand from 2017-2020 and examined macroplastics from the gastrointestinal tracts of 30 dead turtles and 13 beaches, finding that green turtles (Chelonia mydas) comprised the majority of strandings and that plastic ingestion and entanglement were significant mortality factors.
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When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.