CHROMATOPHORE CONTROL AND NEUROSECRETION IN THE MUD SHRIMP, UPOGEBIA AFFINIS

The complete larval development of the mud shrimp Upogebia vasquezi (Gebiidea: Upogebiidae) reared in the laboratory.

The larval development of Upogebia vasquezi consists of four zoeal stages and a megalopa. In the present study, each larval stage was described and illustrated in detail. The first two stages are re-described in order to provide a detailed comparison with the data available for this species recorded in a previous study. The morphological features of all the stages are compared with those of the...

Physiological consequences of parasite infection in the burrowing mud shrimp, Upogebia pugettensis, a widespread ecosystem engineer

The burrowing mud shrimp, Upogebia pugettensis, is an important ecosystem engineer throughout bays and estuaries along the Pacific coast of North America. Populations of U. pugettensis have recently declined throughout its range. A likely reason for this decline is the arrival of an invasive bopyrid isopod parasite, Orthione griffenis, which has colonised the system and increased in prevalence....

Identification of calcium channels that control neurosecretion.

The Dermal Chromatophore Unit

Rapid color changes of amphibians are mediated by three types of dermal chromatophores, xanthophores, iridophores, and melanophores, which comprise a morphologically and physiologically distinct structure, the dermal chromatophore unit. Xanthophores, the outermost element, are located immediately below the basal lamella. Iridophores, containing light-reflecting organelles, are found just beneat...

the relationship between learners critical thinking ability and their performance in the reading sections of the tofel and ielts test

the study reflected in this thesis aims at finding out relationships between critical thinking (ct), and the reading sections of tofel and ielts tests. the study tries to find any relationships between the ct ability of students and their performance on reading tests of tofel and academic ielts. however, no research has ever been conducted to investigate the relationship between ct and the read...