Chemical and live feeding stimulants of the sand fiddler crab, Uca pugilator (Bosc)

Diversity of benthic organic matter flows through polychaetes and crabs in a mangrove estuary: δ13C and δ34S signals

“…This is not an uncommon feeding habit in some fiddler crabs (Robertson et al 1981, Hoffman et al 1984, Wolfrath 1992. However, we think such a diet is less likely here, at least in the case of U. lactea because this species is situated at a low trophic position (δ 15 N: 1.5 ‰, H. L. Hsieh unpubl.…”

Effects of Low Tide Rainfall on Intertidal Zone Material Cycling

“…Euglenoids, green algae and cyanobacteria may also be present, and extensive cyanobac terial mat formation may occur. These benthic microalgae and their products represent nutritious particulate matter [Decho, 1988;Kneib et aI., 1980;Peterson and Howarth, 1987;Robertson et al, 1981;Sullivan and Moncreiff, 1990], and therefore are important participants in nutrient cycles [Hopner and Wonneberger, 1985;Rizzo, 1990]. Additionally, these benthic microalgal assemblages help stabilize soft sediment" [Delgado et al, 1991;Holland et al, 1974;Paterson et al, 1990].…”

Distribuição e abundância dos caranguejos Uca Leach (Crustacea, Decapoda, Ocypodidae) na Baía de Guaratuba, Paraná, Brasil

“…Estes caranguejos alimentam-se de uma variedade de bactérias e microflora bentônicas, tais como diatomáceas e algas azuis que estão associadas com o complexo substrato organo-mineral (CRANE 1975). A detecção de alimento é feita através de quimiosensores localizados nas quelas e, possivelmente na região bucal (ROBERTSON et al 1980, 1981, ROBERTSON & NEWELL 1982. Experimentos com Uca rapax (Smith, 1870) demonstraram que estes animais cavam tocas em núme-ro maior do que o de indivíduos ali presentes e, portanto, cada animal não se limita a escavar apenas a sua toca.…”