The action of OXA-24/40 and OXA-58 β-lactamase-like enzymes represents the main mechanism underlying resistance to carbapenems in Spain in the last decade. AbkA/AbkB proteins in the toxin/antitoxin system may be involved in the successful dissemination of plasmids carrying the bla(OXA-24/40)-like gene, and probably also the bla(OXA-58)-like gene, thus contributing to the plasmid stability.

ABSTRACT. Fiddler crabs are common decapods of intertidal zones; thirteen species have been reported along the coast of the Gulf of Mexico, inhabiting different zones. For the southern region of the Tamiahua Lagoon, Veracruz, Mexico, five species have been identified: Uca panacea, U. rapax, U. spinicarpa, U. virens and U. vocator particularly in the southern region of the Tamiahua Lagoon, Veracruz, Mexico. Here we analysed the fecundity of U. virens in 25 ovigerous females out of 387 individuals collected between December 2008 and December 2009 during eight field trips and from five collection sites. Morphological measurements like carapace length (CL) and carapace width (CW), and total wet weight (TWW) for all individuals collected were taken, and total egg number was counted for ovigerous females. The total population was divided in nine size class intervals. Total egg number varied between 3,617 and 41,099. Egg number increased with CW (ranging from 9.0 to 18.6 mm CW) and TWW. Values of fecundity observed for U. virens in Tamiahua Lagoon vs other Uca species were similar to results reported in literature.

No abstract

We studied reproductive characteristics of the phantom shrimp Tozeuma carolinense inhabiting sea-grass beds to test hypotheses about seasonality of reproduction, sex ratio and sexual system, and fecundity values in 3 Mexican collecting sites in the Gulf of Mexico. Four hundred and eighty collected individuals were measured and separated to 3 groups. Based on discriminant analysis, carapace length (CL) was selected as morphometric feature to define 10 size-class intervals. The relationship between sexes were analyzed. Embryos were counted, measured and classified into 4 stages of development. Regression analyses were performed to determine the correlation between the number and size of embryos vs. CL. Sex ratio was 1:1, however, for each location, the sex ratio was different. Males were smaller than females; ovigerous females were larger than non-ovigerous females and males. Fecundity analysis have a significant positive relationship, both in the number and size of embryos vs. female CL. Ovigerous females were found at all dates, and confirmed in El Cayo populations with monthly samples in a year, so that we conclude that T. carolinense belongs to the species category with a seasonal-continuous reproduction.

No abstract