LOTT,D.B.; ACKERMAN,R.A.*: Thermal dose and embryonic sex determination in Chelydra serpentina. The thermal dose (degree hours) necessary to determine the sex of Chelydra serpentina embryos was assessed over two nesting seasons (1996,1997) using programmable incubators. A total of 48 clutches from Iowa, Illinois, Minnesota and Louisiana were divided among treatments and among experimental boxes within […]
year: 2001
Maximum titers of vitellogenin and storage protein occur during the canalized phase of grasshopper oogensis
HATLE, J.D.*; BORST, D.W.; ESKEW, M.R.; JULIANO, S.A.: Maximum titers of vitellogenin and storage protein occur during the canalized phase of grasshopper oogensis Many organisms meet the challenge of unpredictable environmental conditions by remaining developmentally flexible early in their development and only later enter a canalized (inflexible) phase of development. Our ultimate goal is to […]
Lead analysis of snapping turtle (Chelydra serpentina) hatchlings exposed to lead nitrate at various times during incubation
Rimkus, T.A.*; Siebert, C.A.; Selby, D.M.: Lead analysis of snapping turtle (Chelydra serpentina) hatchlings exposed to lead nitrate at various times during incubation. Eggs from three female snapping turtles were incubated in sand with a water content of 4% by mass. This is equivalent to being exposed to a water potential of -7 kPa. Three […]
Experimental and Demographic Analyses of Growth and Sexual Size Dimorphism in a Lizard, Sceloporus undulatus
JOHN-ALDER, H.B.*; HAENEL, G.J.: Experimental and Demographic Analyses of Growth and Sexual Size Dimorphism in a Lizard, Sceloporus undulatus Sexual size dimorphism (SSD) is a common phenomenon caused by a variety of environmental and genetic mechanisms in animals. In the current study, we investigate the demography of a population of eastern fence lizards (Sceloporus undulatus) […]
Body size evolution in a laboratory strain of Manduca sexta Implications for studies in insect physiology and endocrinology
D’AMICO, L.J.*; DAVIDOWITZ, G.; NIJHOUT, H.F.: Body size evolution in a laboratory strain of Manduca sexta : Implications for studies in insect physiology and endocrinology The tobacco hornworm, Manduca sexta, has been used as a model organism for the study of insect developmental physiology and endocrinology for more than 30 years. Many of the connections […]
The study of shrimp CHHMIHGIH gene family gene structure, expression and biological assay of recombinant neuropeptides
CHAN, S.-M.; GU, P.-L.: The study of shrimp CHH/MIH/GIH gene family: gene structure, expression and biological assay of recombinant neuropeptides The crustacean CHH/MIH/GIH neuropeptide family constitutes a group of important hormone that regulates important processes such as molting, glucose metabolism and reproduction. The characterization of these neuropeptides has attracted much attention due to their potential […]
The effects of sinus gland extracts on transcript levels of farnesoic acid O-methyl transferase (MeT) in the lobster mandibular organ
HOLFORD, K.C.*; BORST, D.W.: The effects of sinus gland extracts on transcript levels of farnesoic acid O-methyl transferase (MeT) in the lobster mandibular organ. Methyl farnesoate (MF) appears to have important roles in the regulation of crustacean reproduction, molting, and behavior. In decapod crustaceans, the mandibular organ (MO) is the principle site of MF synthesis […]
Inhibitory effects of methyl farnesoate (MF) on the reproductive development of tadpole shrimp (TS), Triops longicaudatus
LINDER, C.J.; TSUKIMURA, B.*: Inhibitory effects of methyl farnesoate (MF) on the reproductive development of tadpole shrimp (TS), Triops longicaudatus To identify a reproductive regulator for the invasive TS, T. longicaudatus, the hormone MF was administered to growing juveniles. To administer MF, aquatic vectors (Artemia nauplii) incubated in 0.05% albumin and 5 �g/ml MF for […]
Influence of Melatonin on Hemolymph Metabolites in the Fiddler Crab Uca Pugilator
Tilden, A.R.*; Schwartz, J.; McGann, L.: Influence of Melatonin on Hemolymph Metabolites in the Fiddler Crab Uca Pugilator Melatonin levels were measured in the eyestalks of fiddler crabs (Uca pugilator) acclimated to a LD 12:12 photoperiod, constant dark, and constant light. Melatonin cycled with a photophase peak during the LD 12:12 photoperiod. The cycle persisted […]
Deviants of gas exchange adaptations of the tadpole shrimp
Harper, S.L.; Reiber, C.L.: Deviants of gas exchange: adaptations of the tadpole shrimp Tadpole shrimp Triops longicaudatus inhabiting a rock pool in southern Nevada experience prolonged hypoxia. Diel oxygen concentrations (Po2) in the pool range from 0-20 kPa O2. Tadpole shrimp were reared under low (1-3 kPa) and high (10-13 kPa) Po2‘s to determine the […]