Segments in this Video

Introduction: Episode 2: Toxic Waters (01:51)


Hundreds of algae species inhabit the oceans. This film examines harmful algal blooms and their impact on marine life and human health.

Algae (04:20)

The aquatic plant-like organism consists of various species and are the seas' energy producers. Harmful algal blooms are increasing in frequency. Brian Lapointe samples Sargassum to investigate how nutrient pollution affects algal blooms.

Algal Blooms (02:19)

Dr. Malcolm McFarland regularly samples water from Indian River Lagoon. Agricultural runoff, sewage treatment plants, and septic systems increase nutrient pollution. Experts discuss brown tide and its effects.

Red Tide (08:43)

Red tides produce brevetoxin and are a regular occurrence off the Florida coast. Experts discuss characteristics of karenia brevis and its impact on marine life and humans; causes of red tide blooms remain unclear.

Cyanobacteria (06:25)

Dr. Larry Brand samples waters around Lake Okeechobee and the Caloosahatchee River. Water discharges introduce nutrients into the Gulf of Mexico and Atlantic Ocean, causing algal blooms. Experts discuss cyanobacteria effects and toxins.

Toxins (02:05)

Dr. John Berry searches for compounds in harmful algal blooms that can benefit humans. He tests cyanobacteria toxins on cancer cells. The length and severity of algal blooms in Florida increases and people are looking for help. Experts reflect on nutrient pollution and recovery.

Credits: Episode 2: Toxic Waters (Changing Seas, Season 11) (01:03)

Credits: Episode 2: Toxic Waters (Changing Seas, Season 11)

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Episode 2: Toxic Waters (Changing Seas, Season 11)

Part of the Series : Changing Seas (Season 11)
DVD (Chaptered) Price: $129.95
DVD + 3-Year Streaming Price: $194.93
3-Year Streaming Price: $129.95



Florida experiences many types of harmful algal blooms, some of them annually. Several species of algae, like sargassum, aren’t toxic, but can cause economic and environmental stress when they pile up on beaches and clog up coastlines. Others, like red tide and blue-green algae, release neurotoxins, causing massive wildlife kills and affecting beachgoers. While residents demand answers from their local and state officials, scientists are studying what causes the blooms in the first place and what needs to be done to stop them. Experts are also uncovering alarming evidence that some of these harmful algal blooms have serious impacts on human health, making their research more critical than ever.

Length: 27 minutes

Item#: BVL283020

ISBN: 979-8-88678-501-2

Copyright date: ©2019

Closed Captioned

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