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What drives differences between sympatric species?,

This study compared marine debris ingestion of the coastal dolphins Pontoporia blainvillei and Sotalia guianensis in a sympatric area in Atlantic Ocean.

Among the 89 stomach contents samples of P. blainvillei, 14 (15.7%) contained marine debris. For S. guianensis, 77 stomach contents samples were analyzed and only one of which (1.30%) contained marine debris.

The debris recovered was plastic material: nylon yarns and flexible plastics. Differences in feeding habits between the coastal dolphins were found to drive their differences regarding marine debris ingestion. The feeding activity of P. blainvillei is mainly near the sea bottom, which increases its chances of ingesting debris deposited on the seabed. In contrast, S. guianensis has a near-surface feeding habit.

In the study area, the seabed is the main zone of accumulation of debris, and species with some degree of association with the sea bottom may be local bioindicators of marine debris pollution.

Ana Paula Madeira Di Beneditto, Renata Maria Arruda Ramos,

(http://www.sciencedirect.com/science/article/pii/S0025326X14002008)

 

BLOG STATS As of 01.29.2017 onward have been counting the number people who have read each post. WHY CUT PLASTIC About 100 million tons of plastic are produced each year and much of it is used to make one-use, disposable items. Because plastic doesn't biodegrade these items, though only used for moments can last for decades, centuries, possibly forever. We are creating ever lasting rubbish in unsustainable amounts. It is polluting the environment, maiming even killing animals, poisoning fish and may be poisoning us.

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