Download Biology and Conservation of Horseshoe Crabs by Koichi Sekiguchi, Carl N. Shuster Jr. (auth.), John T. PDF

By Koichi Sekiguchi, Carl N. Shuster Jr. (auth.), John T. Tanacredi, Mark L. Botton, David Smith (eds.)

Biology and Conservation of Horseshoe Crabs, edited by way of Dr. John T. Tanacredi, Dr. Mark L. Botton, and Dr. David R. Smith, deals court cases from a ground-breaking 2007 overseas symposium at Dowling university at the technological know-how and conservation of the horseshoe crab. Horseshoe crabs are famous as "living fossils" with a geological heritage protecting 1000s of thousands of years and an ancestry attaining again 455 million years to your doorstep of the Cambrian. however toughness, each one species now faces universal and growing to be threats. lack of crucial spawning habitat because of erosion and coastline improvement, coastal toxins, and overfishing all threaten horseshoe crab populations. Symposium contributors from around the globe collected to proportion wisdom, current learn effects, and establish conservation demanding situations dealing with horseshoe crabs. This shared overseas wisdom and event is gifted right here as a starting in our collective efforts to preserve the world’s horseshoe crab species. during the e-book, the reader will locate result of new stories, and authoritative experiences at the technological know-how and conservation of all 4 of the world’s horseshoe crab species.

About the editors:

Dr. John T. Tanacredi is Chair and Professor of Earth and Marine Sciences at Dowling university. he's a study affiliate within the Invertebrate Zoology division on the American Museum of normal heritage.

Dr. Mark L. Botton is a Professor of Biology at Fordham collage.

Dr. David R. Smith is a study organic Statistician for the U.S. Geological Survey.

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Additional info for Biology and Conservation of Horseshoe Crabs

Sample text

We tend to generalize, but at the same time we are mindful that horseshoe crabs do not always do what they are expected to do – hence their behavior may fall outside a generality under certain circumstances. 4 Significance of the Discreteness of Populations When morphometric data (Fig. 7) on nearby and on widely separated populations of Limulus polyphemus were obtained it led to the deduction that there were discrete populations (Shuster 1955, 1979). The discovery that morphometric Limits on the Global Distribution of Horseshoe Crabs (Limulacea) 11 Fig.

Hard, decay-resistant ‘skeletal’ components of abundant bottom-dwelling organisms that lived in environments with repeated or rapid sediment input Horseshoe Crabs – An Ancient Ancestry Revealed 29 (and hence burial opportunities) were far more likely to endure the largely destructive rigors of fossilization. Organisms entirely lacking mineralized hard parts (up to 79% of modern marine biotas – see Allison and Briggs 1991), or those that inhabited environments where sediments were continually recycled or not deposited at all, are correspondingly rare as fossils.

Survival of a single xiphosurid lineage through the end-Permian mass extinction events was followed by a minor secondary radiation during the Triassic Period. The Jurassic to Recent fossil record of horseshoe crabs is relatively impoverished in both taxa and known occurrences. Overall, the rarity of fossil xiphosurids reflects both taphonomic biases inherent in the unusual conditions required for preservation of their non-biomineralized exoskeletons and complex ecological factors related to a long-term association with shallow marginal aquatic habitats.

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