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Testing Correlations Between Habitat Structure and Signal Variation in Fiddler Crabs, Genus Uca

Testing Correlations Between Habitat Structure and Signal Variation in Fiddler Crabs, Genus Uca PDF Author: Emily Marie Griffen
Publisher:
ISBN:
Category :
Languages : en
Pages : 70

Book Description


Testing Correlations Between Habitat Structure and Signal Variation in Fiddler Crabs, Genus Uca

Testing Correlations Between Habitat Structure and Signal Variation in Fiddler Crabs, Genus Uca PDF Author: Emily Marie Griffen
Publisher:
ISBN:
Category :
Languages : en
Pages : 70

Book Description


Fiddler Crabs of the World

Fiddler Crabs of the World PDF Author: Jocelyn Crane
Publisher: Princeton University Press
ISBN: 1400867932
Category : Science
Languages : en
Pages : 766

Book Description
Jocelyn Crane presents a survey of the members of the genus Uca, with special reference to their morphology, social behavior, and evolution. Her account is firmly based on numerous field studies along the world's warmer shores and on comparative work in laboratories and museums. Originally published in 1975. The Princeton Legacy Library uses the latest print-on-demand technology to again make available previously out-of-print books from the distinguished backlist of Princeton University Press. These editions preserve the original texts of these important books while presenting them in durable paperback and hardcover editions. The goal of the Princeton Legacy Library is to vastly increase access to the rich scholarly heritage found in the thousands of books published by Princeton University Press since its founding in 1905.

Studies on the Physiological Variation

Studies on the Physiological Variation PDF Author: F. John Vernberg
Publisher:
ISBN:
Category :
Languages : en
Pages : 593

Book Description


Correlation of Genetic Diversity with Habitat Type in the Fiddler Crab Uca Pugnax

Correlation of Genetic Diversity with Habitat Type in the Fiddler Crab Uca Pugnax PDF Author: Maria Berenice Duran
Publisher:
ISBN:
Category : Fiddler crabs
Languages : en
Pages : 80

Book Description


Studies on the Physiological Variation Between Tropical and Temperate-zone Fiddler Crabs of the Genus Uca. IV. Oxygen Consumption of Larvae and Young Crabs Reared in the Laboratory

Studies on the Physiological Variation Between Tropical and Temperate-zone Fiddler Crabs of the Genus Uca. IV. Oxygen Consumption of Larvae and Young Crabs Reared in the Laboratory PDF Author: F. John Vernberg
Publisher:
ISBN:
Category :
Languages : en
Pages : 21

Book Description


Molecular Population Genetics of the Atlantic Sand Fiddler Crab, Uca Pugilator, Along the Atlantic Coast

Molecular Population Genetics of the Atlantic Sand Fiddler Crab, Uca Pugilator, Along the Atlantic Coast PDF Author: David Andrew Weese
Publisher:
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.

Behavioral Variation in Natural Populations of Two Species of Fiddler Crabs (Uca) and Some Preliminary Observations on Directed Modifications

Behavioral Variation in Natural Populations of Two Species of Fiddler Crabs (Uca) and Some Preliminary Observations on Directed Modifications PDF Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 8

Book Description


On the Color Changes of Fiddler Crabs (genus Uca) in the Field

On the Color Changes of Fiddler Crabs (genus Uca) in the Field PDF Author: J. Crane
Publisher:
ISBN:
Category :
Languages : en
Pages :

Book Description


Selection for Sexually Dimorphic Traits and Signal Diversity in Fiddler Crabs

Selection for Sexually Dimorphic Traits and Signal Diversity in Fiddler Crabs PDF Author: Daniela Perez
Publisher:
ISBN:
Category :
Languages : en
Pages : 0

Book Description
The evolution of diverse sexual signals and traits in animals is a promising yet challenging field in behavioural ecology. Sexual features are under the influence of a multitude, and often cryptic, mechanisms. In addition, the composition and strength of selection varies for each study species. Fiddler crabs are ideal subjects for investigating the evolution of diverse sexual traits. Males possess one sexually dimorphic enlarged claw. The structure is used as a weapon in conflicts over territory and signaled in the form of wave displays as courtship to females and warning to intruders. The displays are diverse on the interspecific level, characterized by species-specific movement patterns. In this thesis, I explore the forces behind the evolution of sexually dimorphic claws and the great diversification of fiddler crab signals. In the first two chapters of my thesis I search for a clearer understanding of sexual selection in shaping the species-specific diversity of wave displays in fiddler crabs. First, I investigate if wave displays are cues for species identity in sympatric populations. I use robotic crabs in my experiments and verify that females are able to choose the conspecific over a heterospecific wave movement. In chapter II, I direct my focus to female natural choices and identify their preferences on wave displays and claw size. This final approach allows me to reveal other selective mechanisms, such as constraints from natural selection in male signaling effort. In the second part of my thesis, I expand my approach to the level of social context and its effects on fiddler crab sexual traits. In chapter III, I look into the laterality of the sexually dimorphic claw and examine the different fight endurances when opponents are same- or different-handed. I point out how distinct handedness ratios in fiddler crab populations set contrasting selective pressures in male-male coalitions. In chapter IV, I explore differential social situations in the production of wave signals, and take a step further to explore the social contexts that stimulate the emergence of a rare signal phenomenon, the synchronous waving. Finally, in chapter V, I look into signal diversity from a wider perspective by applying comparative approach to understand the evolution of the wave displays. I gather structural and temporal information of the wave displays of 28 species to predict the likelihood and evolutionary paths of presenting waves in synchrony. Lastly, I indicate how the phenomenon may stem from the particularities of a species mating systems and ecological adaptations.

Habitat Preferences of Gulf Coast Fiddler Crabs and Responses of Plant and Soil Characteristics to Their Burrowing

Habitat Preferences of Gulf Coast Fiddler Crabs and Responses of Plant and Soil Characteristics to Their Burrowing PDF Author: Gwendolyn A. Murphy
Publisher:
ISBN:
Category : Animal burrowing
Languages : en
Pages : 198

Book Description
Positive rather than negative species interactions dominate in stressful environments like tidal marshes. Fiddler crabs have been shown to ameliorate environmental stress and increase primary productivity through their burrowing behavior. Most notably, bioturbation may facilitate growth of tidal marsh plants by altering soil oxygen concentration, decomposition rates, and soil drainage. In turn, plants provide protection from the elements, refuge from predators and roots provide structural support for burrows in soft substrate. However, dense vegetation may limit the fiddler crab's ability to maneuver on the surface and burrow. Similarly, there may be a threshold where fiddler crab activity becomes destructive to plant growth instead of facilitative. Relatively few fiddler crab and plant interaction studies have been conducted on the Gulf Coast compared to Atlantic Coast. Gulf Coast tidal marshes have distinct climate, dominant vegetation zones and dominant fiddler crab species, and consequently it is likely that community dynamics will differ from Atlantic Coast tidal marshes. To explore interactions between Gulf Coast fiddler crabs and tidal marsh plants, I conducted a seasonal fiddler crab habitat survey and a fiddler crab enclosure study. Both studies were conducted at Grand Bay National Estuarine Research Reserve in Mississippi, across four dominant tidal marsh vegetation zones (salt marsh, brackish marsh, fresh marsh and salt panne). Fiddler crab burrows and associated vegetation were randomly surveyed across the vegetation zones to determine fiddler crab burrow density and habitat preferences. Fiddler crab enclosures were established across the four vegetation zones. Enclosures provided a method to test impacts of fiddler crab burrowing on soil and plant parameters as well as to survey fiddler crab populations. Results of the habitat survey indicated that fiddler crabs utilized all four vegetation zones, but burrow density was statistically higher in the fresh marsh during winter compared to other zones. These results suggest that the fresh marsh may be important habitat for overwintering Gulf Coast fiddler crabs. Additionally, the fresh marsh was found to host higher fiddler crab species diversity and a more balanced sex ratio compared to other zones. The enclosure study established that fiddler crab activity had negligible impacts on plant growth in the salt and fresh marsh yet influenced plant growth in the brackish marsh (positively) and salt panne (negatively). The brackish marsh and salt panne are habitats of intermediate environmental stress for plants and fiddler crabs. Brackish marsh is more frequently inundated than the salt panne and hence bioturbation is likely to be more beneficial in the brackish marsh. Furthermore, brackish marsh below-ground structure is substantial and fiddler crab burrow density was low relative to the salt panne. My work indicates that vegetation abundance and fiddler crab burrow density may balance environmental stresses in tidal marshes and influence nature of fiddler crab and plant interactions.