Water, Coasts and Ice

With increasing sea surface temperatures due to climate change, harmful algal blooms in Alaska marine waters are becoming more severe, threatening food security and public health by reducing availability and safety of shellfish and other marine food resources. Paralytic shellfish poisoning, a neurotoxin primarily produced by marine phytoplankton Alexandrium, is the most severe and...

Major floods in Southeast Alaska and Hawaiʻi that potentially threaten life, property, and culturally significant resources and ecosystems are caused by mechanisms related to intense precipitation for both locations as well as snow melt-based processes for Alaska. Small, high-gradient, and heavily vegetated watersheds with direct contribution to the ocean are common in both locations. To

The southeast United States has many lakes, streams and reservoirs that serve as important drinking water sources, recreational, agricultural, and ecological uses. Unfortunately, harmful algal blooms are becoming more common in these waters, causing health issues for humans and animals. While it is clear that nutrients stimulate algae growth, it isn’t clear if there are other parameters...

Marine shellfish are an important diet and cultural resource for many Alaskans. Harmful algal blooms can produce toxins which accumulate in shellfish and can cause disease and death in consumers. Climate change is predicted to expand the timing and strength of harmful algal blooms which may affect food security for many Alaska Native Tribes and communities. Predicting when the shellfish...

Assessments that incorporate areas from land-to-ocean, or “ridge-to-reef", are critical to examine how land-use practices are altering stream discharge and nearshore marine health and productivity. Stream systems in both Alaska and Hawaiʻi are expected to experience changes in water quality associated with changing environmental conditions and increased human-use. Watershed systems...

Elodea spp. (Elodea) is Alaska’s first known invasive aquatic plant, first discovered in urban lakes in 2010. The combination of human pathways and climate change related shifts in seasonality and temperature have resulted in Elodea’s range expansion into Alaska’s freshwater resources. Elodea transmission often occurs when plant fragments get entangled in seaplane rudders and are carried...

Coral reefs are declining worldwide due to a combination of stressors, but climate induced ocean warming is the biggest threat. Warming oceans lead to ‘coral bleaching’ and frequent death, compromising the structure and function of reefs. The increasing frequency and severity of bleaching means that human intervention is needed to support the adaptive capacity of reefs. Most proposed...

For the past few years, “king tides,” or the highest tides of the year, have been occurring more frequently and significantly affecting coastal environments across Hawaiʻi. Now, disappearing beaches and waves crashing over roadways are seemingly the “new normal.” In response, the state of Hawaiʻi is implementing adaptation strategies to combat tidal flooding in coastal areas. While flood

One of the most visible signs of climate change is less mountain snow. In the Western U.S., deep snow has historically been a cornerstone of life for many plants and animals. For example, snow can provide denning shelter for certain species like the wolverine, and snowmelt provides dependable water to mountain streams that are home to fish like the bull trout. Yet snow losses driven by...

In the Western U.S., approximately 65% of the water supply comes from forested regions with most of the water that feeds local rivers coming from snowmelt that originates in mountain forests. The Rio Grande headwaters (I.e. the primary water generating region of the Rio Grande river) is experiencing large changes to the landscape primarily from forest fires and bark beetle infestations...

Coregonines are a sub-family of freshwater fishes within the well-known Salmonidae family. In the upper midwestern U.S., these fishes have provided a key food source to Native Americans for millennia. Since the mid-20th century, however, their diversity and abundance has declined owing to several anthropogenic stressors including overfishing, declining quality of key habitat (e.g., dams

Increasing water usage and demands, combined with potentially less source water as a result of climate change impacts, are causing water resource managers to evaluate and implement alternative solutions for reducing water shortages, maximizing water availability, and reducing costs. The capture and reuse of wastewater is a promising strategy for increasing available water, but the costs...