Ep 7. Tidal Seas

The Blue Planet - Seas of Life season 1 episode 7 titled Tidal Seas explores the unique and diverse ecosystems that exist within the intertidal zone, the stretch of land that exists between the high and low tide marks.

Narrated by David Attenborough, the episode takes viewers on a journey across the world's oceans, from the rocky shores of the Pacific Northwest to the sandy beaches of the Galapagos Islands, to witness the fascinating adaptations of the animals and plants that call the intertidal zone their home.

The episode begins by showcasing the impressive strength and resilience of the gumboot chiton, a mollusk that can withstand the crushing force of waves that crash onto rocky shores. Viewers are then introduced to the sea otter, a charismatic and playful mammal that relies heavily on the abundant shellfish found in the intertidal zone for its diet.

The episode then shifts its focus to the Galapagos Islands, where marine iguanas have evolved to become the world's only marine lizards. These reptiles can hold their breath for up to 45 minutes and can dive as deep as 30 feet to feed on algae growing on underwater rocks.

The intertidal zone is also home to a vast array of crabs, including the strikingly blue Sally Lightfoot crab found along the rocky shores of the Galapagos. These crabs are excellent climbers and can move along vertical rock faces with ease.

The episode also highlights the intricate relationship between anemones and clownfish, famously depicted in the movie Finding Nemo. These fish take shelter among the stinging tentacles of anemones, which provide protection from predators in exchange for small bits of leftover food.

As the tide begins to recede, viewers are shown the intricate and mesmerizing patterns left behind by moon snails as they hunt for prey in the sand. The episode also explores the phenomenon of tidal pools, small bodies of water that are left behind as the tide goes out. These pools provide crucial habitat for a variety of marine creatures, including sea stars and urchins.

The episode ends with a reminder of the delicate balance that exists within the intertidal zone, and the importance of preserving these ecosystems for future generations to enjoy and learn from.

Overall, Tidal Seas is a visually stunning and informative episode of Blue Planet - Seas of Life, showcasing the incredible diversity and adaptability of life within the intertidal zone. Fans of nature documentaries and marine biology will find this episode to be a must-watch.