Author: Maria Berenice DuranPublisher:
ISBN:
Category : Fiddler crabs
Languages : en
Pages : 80
Book Description
Correlation of Genetic Diversity with Habitat Type in the Fiddler Crab Uca Pugnax
Author: Maria Berenice DuranPublisher:
ISBN:
Category : Fiddler crabs
Languages : en
Pages : 80
Book Description
Testing Correlations Between Habitat Structure and Signal Variation in Fiddler Crabs, Genus Uca
Author: Emily Marie GriffenBehavioral Ecology and Population Biology in Populations of of Fiddler Crabs, Uca Pugnax (Smith), on the New Jersey Coast
Author: Lauren L. BergeyPublisher:
ISBN:
Category : Aquatic ecology
Languages : en
Pages : 268
Book Description
Aspects of Population Ecology in Two Populations of Fiddler Crabs, Uca Pugnax
Author: Lauren L. BergeyMolecular Population Genetics of the Atlantic Sand Fiddler Crab, Uca Pugilator, Along the Atlantic Coast
Author: David Andrew WeesePublisher:
ISBN:
Category : Fiddler crabs
Languages : en
Pages : 63
Book Description
Author's abstract: The Atlantic sand fiddler crab, Uca pugilator, is an extremely abundant fiddler crab found along the eastern and Gulf coast of the United States. Fiddler crabs have a life cycle with an obligatory planktonic larval phase of 30-90 days, which might be expected to lead to widespread larval dispersal and consequent genetic homogeneity over considerable distances. However a large amount of morphological and behavioral variation is found between northern and southern populations along the eastern coast. This study was undertaken to determine the population genetic structure of U. pugilator and to determine whether these differences may have a genetic basis. The population structure of the fiddler crab was analyzed using 576 individuals collected from 12 sites along the eastern coast. PCR-base single stand conformation polymorphism (SSCP) was used to analyze segments of the mitochondrial 16S rRNA and the nuclear internal transcribed spacer 1 (ITS1) genes of these individuals. The ITS1 marker did not prove to be informative when screened by SSCP for this study. The 16S marker revealed a moderate amount of population structure (FST = 0.292) between populations. The results of this study reveal frequent gene flow between nearby localities, but reduced levels between populations separated by large distances. Despite the potential for high dispersal by planktonic larvae, population differentiation and isolation by distance was found between populations U. pugilator. Northern and southern regions are separated by a genetic distance of 0.3866 suggesting the potential for morphological and behavioral differentiation across the species range. INDEX WORDS: Uca pugilator, Fiddler crab, Population structure, Gene flow, Larval dispersal, Single-stand conformational polymorphism, 16S rDNA, ITS-1.
Sex Ratio and Body Condition in Female Uca Pugnax Fiddler Crabs Along the Eastern Coast of the United States
Author: Jessica EspinosaPublisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
The fiddler crab Uca pugnax is a semi-terrestrial estuarine crab that lives in salt marshes along the Eastern coast of North America from northern Florida to New Hampshire (Sanford et al. 2006). Uca pugnax is an important study organism because it impacts the surrounding ecosystem, as fiddler crabs can maintain Spartina growth, are a major staple in the diet of many fish species and other predators, and eat many of the meiofaunal organisms present in the surrounding Spartina. There is an interest in studying these crabs in particular because their coastal range is expanding north, and this expansion could lead to a modification in the structure of the surrounding ecosystem. The farthest north scientists previously found these crabs was in Cape Cod, MA, but in recent years climate change has caused a northern range expansion of both the species and of fiddler crabs as a whole (Sanford et al. 2006). In the northern part of Uca pugnax's range, water temperature is the limiting factor, and therefore explains the range expansion north due to the increasing global temperatures. In fiddler crabs, fat is mobilized for reproduction, and since fitness means the ability to survive and reproduce, fitness equals fatness, or body condition. It is hypothesized that latitude is correlated with Uca pugnax body condition, and that there is also some seasonal variation in body condition along the range. When four different locations along the range were sampled, no differences in body condition were found between sites. This is interesting because in the northern end of the range, adult fiddler crabs spend nearly half of the year underground, and thus have a much shorter feeding season than southern fiddler crabs. However, a significant difference was found between seasons for fall 2012 and the interaction of season and location. The number of ovigerous females was lowest in the fall throughout all locations, and a male-skewed sex ratio was seen in Georgia. These results are preliminary, but suggest that crabs in all locations share a similar body condition despite the varying global temperatures. There is also a seasonal difference, which may be more prominent at the southern end of the range.
Biology of the Land Crabs
Author: Warren W. BurggrenPublisher: Cambridge University Press
ISBN: 9780521306904
Category : Nature
Languages : en
Pages : 504
Book Description
Interest in land crabs has burgeoned as biologists have increasingly focused on the evolution of terrestriality. Before the publication of this volume in 1988, there had been no single comprehensive source of information to serve biologists interested in the diverse aspects of terrestrial decapod crustacean. Biology of the Land Crabs was the first synthesis of recent and long-established findings on brachyuran and anomuran crustaceans that have evolved varying degrees of adaptation for life on land. Chapters by leading researchers take a coordinated evolutionary and comparative approach to systematics and evolution, ecology, behaviour, reproduction, growth and molting, ion and water balance, respiration and circulation, and energetics and locomotion. Each discusses how terrestrial species have become adapted from ancestral freshwater or marine forms. With its extensive bibliography and comprehensive index, including the natural history of nearly eighty species of brachyuran and anomuran crabs, Biology of the Land Crabs will continue to be an invaluable reference for researchers and advanced students.
Maritime Traffic Effects on Biodiversity in the Mediterranean Sea
Author: Ameer AbdullaPublisher: IUCN
ISBN: 2831710790
Category :
Languages : en
Pages : 170
Book Description
Biodiversity
Author: Takuya AbePublisher: Springer Science & Business Media
ISBN: 146121906X
Category : Science
Languages : en
Pages : 291
Book Description
Despite acknowledgment that loss of living diversity is an international biological crisis, the ecological causes and consequences of extinction have not yet been widely addressed. In honor of Edward O. Wilson, winner of the 1993 International Prize for Biology, an international group of distinguished biologists bring ecological, evolutionary, and management perspectives to the issue of biodiversity. The roles of ecosystem processes, community structure and population dynamics are considered in this book. The goal, as Wilson writes in his introduction, is "to assemble concepts that unite the disciplines of systematics and ecology, and in so doing to create a sound scientific basis for the future management of biodiversity."
Environmental Physiology of Marine Animals
Author: W. B. VernbergPublisher: Springer Science & Business Media
ISBN: 3642653340
Category : Science
Languages : en
Pages : 351
Book Description
Within recent years man has become increasingly aware of the disastrous environmental changes that he has introduced, and therefore society is now more concerned about understanding the adaptations organisms have evolved in order to survive and flourish in their environment. Because much of the information pertaining to this subject is scattered in various journals or special symposia proceedings, our purpose in writing this book is to bring together in a college-and graduate-student text the principal concepts of the environmental physiology of the animals that inhabit one of the major realms of the earth, the sea. Our book is not meant to be a definitive treatise on the physiological adap tation of the animals that inhabit the marine environment. Instead, we have tried to highlight some of the physiological mechanisms through which these animals have been able to meet the challenges of their environment. We have not written this book for anyone particular scientific discipline; rather, we hope that it will have an interdisciplinary appeal. It is meant to be both a reference text and a text for teaching senior undergraduate and graduate courses in marine biology, physiological ecology of marine animals, and envi ronmental physiology of marine animals.