Relationships among salinity, egg size, embryonic development, and larval biomass in the estuarine crab Chasmagnathus granulata Dana, 1851

2001 ◽  
Vol 260 (2) ◽  
pp. 241-257 ◽  
Author(s):  
Luis Giménez ◽  
Klaus Anger
Keyword(s):  
Embryonic Development ◽  
Egg Size ◽  
Chasmagnathus Granulata ◽  
Crab Chasmagnathus Granulata

Antioxidant Defenses and DNA Damage Induced by UV-A and UV-B Radiation in the Crab Chasmagnathus granulata (Decapoda, Brachyura)¶

2005 ◽  
Vol 81 (2) ◽  
pp. 398 ◽  
Author(s):  
Glauce R. Gouveia ◽  
Daiane S. Marques ◽  
Bruno P. Cruz ◽  
Laura A. Geracitano ◽  
Luiz E. M. Nery ◽  
...  
Keyword(s):  
Dna Damage ◽  
Antioxidant Defenses ◽  
Chasmagnathus Granulata ◽  
Crab Chasmagnathus Granulata

scholarly journals Anticholinesterase effect of eserine (physostigmine) in fish and crustacean species

2001 ◽  
Vol 44 (1) ◽  
pp. 63-68 ◽  
Author(s):  
José M. Monserrat ◽  
Adalto Bianchini
Keyword(s):  
Cholinesterase Activity ◽  
Fish Larvae ◽  
Kinetic Characteristic ◽  
Natural Substrate ◽  
Crustacean Species ◽  
Lower Affinity ◽  
Substrate Analogues ◽  
Farfantepenaeus Paulensis ◽  
Chasmagnathus Granulata ◽  
Crab Chasmagnathus Granulata

The kinetic characteristic (Km) of cholinesterase from the crab Chasmagnathus granulata, the shrimp Farfantepenaeus paulensis and the fish Odontesthes bonaeriensis were compared and correlated with the anticholinesterasic effect of eserine (physostigmine). For the crustaceans, the estimated Km values were about 5-8 times higher than that estimated for the fish (0.04 mM). In the crab and the shrimp, the concentration of eserine which inhibited 50% of cholinesterase activity (IC50) was estimated as 5.33x10-4 and 4.33x10-4 mM, respectively. In both cases, it was significantly higher (P < 0.05) than that estimated for the fish larvae (7.43x10-5 mM). A high Km could reflect a lower affinity of the cholinesterase for its natural substrate, acetylcholine, or for substrate analogues such as carbamates and organophosphorous pesticides. If we consider the IC50 for eserine as an index of enzyme susceptibility to pesticide inhibition, the cholinesterase from the fish larvae may be a better useful tool in assays for pesticide biomonitoring than that from crustacean species.

Variation in Peregrine Falcon Eggs

The Auk ◽  
1984 ◽  
Vol 101 (3) ◽  
pp. 578-583 ◽  
Author(s):  
William A. Burnham ◽  
James H. Enderson ◽  
Thomas J. Boardman
Keyword(s):  
Embryonic Development ◽  
Representative Sample ◽  
Shell Thickness ◽  
Egg Size ◽  
Peregrine Falcon ◽  
Eggshell Thickness ◽  
Fresh Weight ◽  
Initial Weight ◽  
Future Studies ◽  
Peregrine Falcons

Abstract Eggs collected from captive and wild Peregrine Falcons (Falco peregrinus) were used to examine variation in eggshell thickness, length, breadth, and initial weight to resolve questions about eggshell data from wild falcons. For captive falcons, shell thickness of first clutches did not change over the years a falcon laid or with embryonic development. Eggshells in third clutches, but not second clutches, were significantly thinner than those from first clutches. Greatest variation in shell thickness existed between eggs within a clutch and did not differ significantly between wild and captive eggs. Entire clutches of wild falcons should be represented in future studies to maximize the chance of obtaining a representative sample in regard to shell thickness. Egg size (L, B, and fresh weight) decreased over the years a captive falcon laid. A significant decrease in size (B and fresh weight) also occurred in second and third clutches laid the same year. Ratcliffe's Index generally appeared to be a reliable indicator of shell thickness in captive-laid eggs.

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