+ Resolve Article
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter

+ Translate
+ Subscribe to Site Feed
GeoScience Most Shared ContentMost Shared Content

The relative importance of substratum characteristics and recruitment in determining the spatial distribution of the fiddler crab Uca uruguayensis Nobili

, : The relative importance of substratum characteristics and recruitment in determining the spatial distribution of the fiddler crab Uca uruguayensis Nobili. Journal of Experimental: 99-111

The roles of sediment characteristics and the pattern of recruitment in influencing the abundance of the fiddler crab Uca uruguayensis on Argentinean mudflats were evaluated. The density of adult crabs showed a patchy distribution related to the sediment thickness (depth at which a layer of fossil shells are buried), but the density of juvenile crabs was not coupled with the density of adult crabs. In a field experiment, fossil shells were removed and the density of crabs significantly increased, which demonstrates that the presence of the layer of shells is a structure that may hinder the establishment of burrows. The density of crabs was related to sediment thickness, sediment torque and organic matter content. The importance of each of these variables was different for adult and juvenile crabs, indicating that the distribution of adult crabs may be caused by mechanisms affecting adult crabs themselves and is not established by the recruitment pattern. Moreover, in a field experiment, the density of juveniles decreased when adult crabs were added, and increased when adult crabs were removed.The morphology of burrows was related to sediment characteristics. Burrows were deeper, longer and more voluminous when sediment thickness was high. The volume of burrows decreased with increasing sediment torque. These results suggest that the morphology of burrows is related to the space available and the ease with which sediment it can be excavated. However, an important amount of variability remained unexplained, suggesting the presence of additional environmental variables or behavioural plasticity not considered by this study. Together, these results demonstrate that the spatial heterogeneity in the environmental factors can be translated to a spatial heterogeneity in the distribution of fiddler crabs.


DOI: 10.1016/j.jembe.2004.09.014

Other references

Nair, B.G.; Rashed, H.M.; Patel, T.B., 1989: Epidermal growth factor stimulates rat cardiac adenylate cyclase through a GTP-binding regulatory protein. In isolated perfused rat hearts, epidermal growth factor (EGF; 15 nM) increased cellular cyclic AMP (cAMP) content by 9.5-fold. In rat cardiac membranes, EGF also stimulated adenylate cyclase activity in a dose-dependent manner, with maximal stimu...

Silva, E.J.; Gatto, I.; Simões, J.B.; Vilela, O., 1968: Use of methyl polysiloxane in opaque injections. Revista Brasileira de Medicina 25(8): 521-522

Adams, J.D.; Garcia, C., 2006: Women's health among the Chumash. Plants were, and still are, widely used for a number of conditions affecting women in California. This article discusses traditional remedies of the Chumash for dysmenorrhea, premenstrual syndrome, feminine hygiene, heavy menstruation, urinary tra...

French, S.W.; Miyamoto, K.; Wong, K.; Jui, L.; Briere, L., 1988: Role of the Ito cell in liver parenchymal fibrosis in rats fed alcohol and a high fat-low protein diet. Eight pairs of young adult rats were pair-fed a high fat-low protein diet and ethanol or isocaloric glucose by permanent intragastric cannula for up to 6 months. Biopsies of the liver were taken monthly and the fibrosis was quantitated morphometri...

Pham, V.H.T.; Kim, J.; Jeong, S-Woo., 2015: Enhanced isolation and culture of highly efficient psychrophilic oil-degrading bacteria from oil-contaminated soils in South Korea. It is known that isolation of oil-degrading bacterial strains is difficult at low temperatures, and the biodegradation efficiency of oil-contaminated soil is significantly reduced in cold weather. In this study, 14 strains were isolated from oil-c...

Porte, W.S., 1947: Success in growing tomatoes de-pends on both heredity and environment. The kind of a tomato crop that farmers will grow next summer will depend on such factors as soil fertility, rainfall, temp. and cultural methods, as well as the hereditary characteristics bred into the vars. Since vars. produce best under the cond...

Macia, M.; Coronel, F., 1995: Serum phosphate control: what about calcium salts of keto-amino acids?. Nephrology, Dialysis, Transplantation 10(11): 2159-2160

Ortega, S.Suárez.; Brito, J.López.; Lémes, H.Mendoza.; Socorro, C.R.Hernández.; Sánchez, E.Melado.; Martínez, J.Delgardo., 2007: Circulating anticoagulant and focal liver lesions associated to rich clinical expression in the secondary syphilis. A 37-year-old male was admitted at our hospital for evaluation of clinical presentation of 8 weeks evolution of malaise, fever, sore throat and nose, arthralgias, holocraneal headache, photophobia and nausea. With the shower he noticed spots in pa...

Sugaya, K.; Sekiguchi, Y.; Satoh, T.; Shiroma, K.; Kadekawa, K.; Ashitomi, K.; Nishijima, S., 2015: Effect of propiverine hydrochloride on stress urinary incontinence. To investigate whether the anticholinergic agent, propiverine hydrochloride, is clinically effective for stress urinary incontinence. The participants were adult female patients with the chief complaint of stress incontinence. Propiverine (20 mg...

Bartel's, A.V., 1960: On late postpartum hemorrhages. Akusherstvo i Ginekologiia 36: 21-27