Status and Trends

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Threatened and Endangered Species

Mollusks+Lakes
Mollusks are invertebrates that have soft, non-segmented bodies and are often covered by a hard shell. This group of invertebrates includes snails, clams, oysters, whelks, mussels, slugs, octopuses, and squids. Ranging from minute snails and clams to large organisms such as squid and octopus, many mollusks live in intertidal marine environments, shallow subtidal and the continental shelf. Not all mollusks are marine organisms, however. Nearly 300 species of mussels inhabit freshwater rivers and lakes in North America. This is the richest diversity of mussels found in the world. Freshwater mussels are sedentary, long-lived (some live over 100 years) mollusks that live in sediments and filter water to feed.

Did You Know...?

Squid: Bermuda's Beauties
Squid are an important source of food for many animals, and support expanding fisheries.Oceanic squid migrate long distances, and these delicate creatures are challenging to rear in captivity. These characteristics make squid hard to study, and because they are susceptible to handling mortality, they have been uncommonly difficult to tag.

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Genetic population structure of the green floater (Lasmigona subviridis): Identification of management units and associated fish hosts

Publisher: USGS | Science Center: Leetown Science Center (LSC, Kearneysville) | Format: URL

www.lsc.usgs.gov — Freshwater bivalves, which are among the most threatened animals in North America, present significant challenges to conservation biologists that attempt to maintain ecological and evolutionary processes within and among populations. Effective management of this rare fauna is often complicated because inadequate information exists for More...

Zebra Mussels

Publisher: USGS | Science Center: Upper Midwest Environmental Sciences Center (UMESC, LaCrosse) | Format: URL

www.umesc.usgs.gov — Zebra mussels have caused drastic declines in native clam and mussel populations in some locations. Zebra mussels compete with other invertebrates and young fish for plankton, the primary food source for these groups. UMESC scientists are investigating the effects zebra mussels are having on the riverine ecosystem. This study examines the effects More...

Deep Water Science Project, Great Lakes

Publisher: USGS | Science Center: Great Lakes Science Center (GLSC, Ann Arbor) | Format: URL

www.glsc.usgs.gov — The USGS Great Lakes Science Center (GLSC) has a long history of significant contributions to the understanding of aquatic resources in the Great The main focus of the Center's research is on the long-term dynamics of native and non-native aquatic species and the sustainability of Great Lakes fisheries. Since the Center was established, the fish More...

Evaluation of sampling designs to monitor populations of freshwater mussels in small- to mid-sized drainages in the northeastern ecoregion

Publisher: USGS | Science Center: Leetown Science Center (LSC, Kearneysville) | Format: URL

www.lsc.usgs.gov — Freshwater mussels are declining rapidly in response to habitat degradation associated with anthropogenic changes. Williams et. al. (1993) reported that 213 of the 297 recognized taxa are considered endangered, threatened, or of special concern. There is a documented need for BRD centers to provide guidance on freshwater mussel ecology in general, More...

Reports & Publications

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Fish

Insects

Other Invertebrates

Inland Waters

Wetlands

Invasives

Threatened and Endangered Species

Genetic population structure of the green floater (Lasmigona subviridis): Identification of management units and associated fish hosts

Zebra Mussels

Deep Water Science Project, Great Lakes

Evaluation of sampling designs to monitor populations of freshwater mussels in small- to mid-sized drainages in the northeastern ecoregion