Summary written by Sofia Denkovski
Protecting Migratory Species
- Migratory species often show spatial/temporal segregation of sexes, which can lead to sex-biased mortalities.
- Sea-birds commonly exhibit sexual segregation in migration, winter, and sex-biased mortality. Magellanic penguin females have higher mortality than males in winter.
- To protect these species, an understanding of distributions of the sexes is essential.
Sexual Segregation of Magellanic Penguins
- Females stayed approx. 47 km closer to shore than males.
- Females were found in northern areas more than males.
- Females departed the colony earlier than males.
- Mates did not overlap at sea.
Effects of sex-biased distribution on females
- Increased likelihood of gill-net entanglements and beach strandings.
- Increased effects from pollutants in the Rio de la Plata river plume.
- Northern foraging areas are utilized by various marine mammals, sea turtles, sea birds, etc.
What does this tell us?
- Northern and near-shore distribution of females increases their vulnerability to pollution, entanglement, and harmful algal blooms
- Further protection of female non-breeding and migration areas is essential!