Search results for: the-american-horseshoe-crab

The American Horseshoe Crab

Author : Carl Nathaniel Shuster
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This book brings together 20 scientists who have worked on all aspects of horseshoe crab biology to compile the first fully detailed, comprehensive view of Limulus polyphemus. An indispensable resource, the volume describes behavior, natural history, and ecology; anatomy, physiology, distribution, development, and life cycle.

Biology and Conservation of Horseshoe Crabs

Author : John T. Tanacredi
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Horseshoe crabs, those mysterious ancient mariners, lured me into the sea as a child along the beaches of New Jersey. Drawn to their shiny domed shells and spiked tails, I could not resist picking them up, turning them over and watching the wondrous mechanical movement of their glistening legs, articulating with one another as smoothly as the inner working of a clock. What was it like to be a horseshoe crab, I wondered? What did they eat? Did they always move around together? Why were some so large and others much smaller? How old were they, anyway? What must it feel like to live underwater? What else was out there, down there, in the cool, green depths that gave rise to such intriguing creatures? The only way to find out, I reasoned, would be to go into the ocean and see for myself, and so I did, and more than 60 years later, I still do.

Spatial Ecology of American Horseshoe Crab Limulus Polyphemus in Chatham Cape Cod MA

Author : Sarah Elizabeth Dorothea Martinez
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Information regarding spawning site fidelity and movement patterns of the American horseshoe crab (Limulus polyphemus) is crucial for developing effective conservation and management strategies on the correct spatial scale. To investigate the spatial ecology of American horseshoe crabs, 75 adult animals were tracked off the coast of Chatham, Cape Cod, MA from June 2010 to November 2011 using acoustic telemetry. Two groups of horseshoe crabs were tagged in spawning habitats (separated by ~2.0 km) with differing commercial harvesting pressure: one group inside Stage Harbor, where harvesting is permitted and the other within a Marine Protected Area (MPA) where harvesting is prohibited. Network analysis revealed that horseshoe crabs exhibited fidelity to spawning habitat, but not necessarily to the habitat where they were initially tagged. Fifty-nine percent of horseshoe crabs tagged inside Stage Harbor were detected in the MPA and 13% of horseshoe crabs tagged in the MPA were detected inside Stage Harbor. Although horseshoe crabs were utilizing both spawning habitats, predictive modeling revealed little temporal overlap, suggesting that horseshoe crabs from the two spawning habitats represent local populations. Isolated and local populations are more susceptible to overexploitation than are larger populations with many migrants. To protect against overharvest and extinction of isolated and local populations, the correct identification of management units (MUs) must be a priority of fisheries managers. Horseshoe crab populations around Cape Cod, Massachusetts and New England behave differently, requiring the collection of more information so that conservation tools such as MUs or MPAs can be used most effectively.

Limulus in the Limelight

Author : John T. Tanacredi
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Limulus in the Limelight: A Species 350 Million Years in the Making and in Peril? contains 14 chapters covering the horseshoe crab's biology, ecology and evolutionary development. The book is a result of three mini-conferences held between 1996 and 2000 celebrating the populations in NY harbor. This book exposes the impacts of over fishing on this species; clarifies the future research agenda for the species worldwide and emphasizes the need for conservation of this fascinating creature's estuaries/ocean habitats. Biologists, ecologists, science educators, and conservationists will welcome this book because it is aimed at the preservation of Limulus, not only for its pharmacological interest but for the mystery related to its longevity. Limulus is a unique animal which has provided numerous uses for man over the years, from fertilizer to bait to medical research. However, if this species is not protected soon, it will be lost for the future.

Biological Rhythms of the American Horseshoe Crab Limulus Polyphemus

Author : Rebecca L. Anderson
File Size : 25.8 MB
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Pharmaceutical Induced Behavioral Changes in the American Horseshoe Crab Limulus Polyphemus

Author : Amber R. Pippins
File Size : 55.57 MB
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Changing Global Perspectives on Horseshoe Crab Biology Conservation and Management

Author : Ruth H. Carmichael
File Size : 89.17 MB
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This book reports significant progress of scientific research on horseshoe crabs, including aspects of evolution, genetics, ecology, population dynamics, general biology and physiology, within the recent 10 years. It also highlights the emerging issues related to world-wide conservation threats, status and needs. The contributions in this book represent part of an ongoing global effort to increase data and concept sharing to support basic research and advance conservation for horseshoe crabs.

High Tide for Horseshoe Crabs

Author : Lisa Kahn Schnell
File Size : 61.52 MB
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Dual-layered text introduces the life cycle of the horseshoe crab, with a focus on the annual mass-spawning event at Delaware Bay.

Digestive Proteases of the American Horseshoe Crab L i m u l u s P o l y p h e m u s

Author : Marjorie Jean Ray
File Size : 51.22 MB
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Spawning Behavior and Larval Biology of the American Horseshoe Crab Limulus Polyphemus in a Microtidal Coastal Lagoon

Author : Gretchen Sarah Ehlinger
File Size : 51.2 MB
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Multiple Stressor Interactions and Effects on Embryo Development of the American Horseshoe Crab Limulus Polyphemus

Author : Maria Christina Vasquez
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Organisms in coastal marine habitats experience environmental stressors that may affect their survival and performance. Exposure to thermal stress, hypo-salinity stress and hypoxia occur in coastal habitats and exposure to each stressor in isolation may inhibit growth and development, and even result in death. However, organisms in their natural habitat experience multiple environmental stressors that can interact in ways that may not be predicted from single stressor exposures. The goal of my dissertation research was to investigate how multiple environmental stressors interacted and affected development of a coastal marine invertebrate, the American horseshoe crab, Limulus polyphemus. I first examined whether nesting horseshoe crabs from the Florida Gulf Coast deposited their eggs in microclimate conditions within the sand that maximized embryo development.

A Mid Atlantic Study of the Movement Patterns and Population Distribution of the American Horseshoe Crab Limulus Polyphemus

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In conjunction with Cambrex, a biomedical company that utilizes horseshoe crabs for the production of Limulus Amoebocyte Lysate (LAL), a study was conducted to investigate movement patterns and population distributions of horseshoe crabs to increase understanding of mid-Atlantic horseshoe crab populations. In addition, areas of the shoreline of Tom's Cove, Assateague Island, Virginia were investigated as possible locations for annual spawning surveys. Twelve thousand five hundred horseshoe crabs were tagged and released in Chincoteague, Virginia and Ocean City, Maryland as part of a movement study; 431 (3.45%) were reported as resights. The mean distance between site of release and site of recapture for all resighted crabs was 68.3 km; maximum distance moved was 493.7 km. During 1999-2004, demographic data were collected from horseshoe crabs harvested in Chincoteague, VA and Ocean City, MD. The proportion of females (p

Searching for the American Eel Anguilla Rostrata Attractant in American Horseshoe Crab Limulus Polyphemus

Author : Jason D. Rager
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The American horseshoe crab (Limulus polyphemus) experienced a population decline in the 1990s. The intensified harvest for use as bait in the whelk and American eel pot fisheries was recognized as a potential stressor upon the population. Identification of the American eel attractant in Limulus for inclusion into an artificial bait would relieve some of this pressure. A laboratory choice bioassay was developed to identify Limulus extracts retaining attractive properties. Laboratory bioassay results suggest the American eel attractant in female Limulus is heat stable to 95° C and cannot be precipitated by ethanol. It is also shown that free amino acids and small molecules occurring in Limulus extracts, including betaine, a compound known to induce feeding in fish, are not responsible for the extract's attractive properties at the concentrations tested. A biodegradable non-soluble, heat stable carrier matrix was formulated from alginic acid sodium salt and other common food industry components for use in laboratory experiments. Field trials were conducted to test the efficacy of the carrier matrix in a real world setting. Field trials confirmed that the carrier matrix is suitable for use in the American eel pot fishery. It was also found that only 1/2 of the traditional bait, by weight, was needed to retain positive control catch rates when using the carrier matrix.

A Biochemical Analysis of Developing Eggs and Larvae of the American Horseshoe Crab Limulus Polyphemus from Delaware Bay and the Gulf of Mexico

Author : Meagan Alma McNamara Williams
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Circadian Clocks in Two Intertidal Species the American Horseshoe Crab and the Mummichog

Author : Brendan Michael Reilly
File Size : 59.83 MB
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Biology of Horseshoe Crabs

Author : Sekiguchi, K.
File Size : 81.6 MB
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The Environmental Influences on American Horseshoe Crab Limulus Polyphemus Behavior and Distribution in the Great Bay Estuary New Hampshire U S A

Author :
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Official Meeting Program

Author : Ecological Society of America. Meeting
File Size : 21.35 MB
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Abstracts of the Annual Meeting of the American Society for Microbiology

Author : American Society for Microbiology. Meeting
File Size : 89.58 MB
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Videnskabelige meddelelser fra Dansk naturhistorisk forening

Author : Dansk naturhistorisk forening
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