SPEER, T.*; MARTIN, K.: Events at hatching in eggs of the California grunion fish, Leuresthes tenuis The moment of hatching is a turning point in the life of any animal, but when an egg hatches quickly in response to an environmental trigger, the process is particularly intriguing. California grunion fish spawn terrestrially during semilunar high […]

TILLMAN, EG*; OLSON, JR; HATLE, JD; JULIANO, SA: Estimating a threshold of hemolymph proteins necessary for reproduction of lubber grasshoppers The reproductive cycle of Romalea microptera is divided into two phases: an early plastic phase during which feeding rate affects timing of reproduction, and a later canalized phase during which feeding does not affect timing. […]

PERNET, B.*; JAECKLE, W.: Egg size and energy content in polychaete annelids: a comparison with echinoderms Eggs of many polychaete species are smaller than the smallest echinoderm eggs. In addition, polychaete eggs greater than about 100 µm in diameter typically develop without a feeding larval stage, but among echinoderms the transition between feeding and non-feeding […]

TILDEN, Andrea R.; DANZIGER, Andrew; OWEN, Jeffrey; STERIO, Thomas; THURSTON, Kristy: Effects of Melatonin on Locomotor and Cardiac Activity in the Fiddler Crab Uca pugilator We previously measured melatonin in fiddler crabs (Uca pugilator) and determined that melatonin cycles over a 24 hr period, with a mid-photophase peak that persists under constant conditions. Under some […]

KOHEL, K.A.*; EALES, J.G.: Effects of Chronic Dietary Triiodothyronine and Thyroxine on Acute In vivo Absorption of Radioactive Triiodothyronine and Thyroxine from the Intestine and Uptake into Enterohepatic Tissues in Rainbow Trout In teleost fish, peripheral tissues regulate thyroidal status. Hence, the intestine, with access to thyroid hormones (TH), may contribute to TH availability through […]

WIENS, S.C.*; EALES, J.G.: Effects of 17-β-estradiol on thyroid hormone deiodination in liver and brain of rainbow trout (Oncorhynchus mykiss) at different reproductive states Reproductive hormones affect thyroid system function in rainbow trout. 17-β-estradiol (E2) effects on thyroid hormone (TH) deiodination in sexually differentiated rainbow trout were investigated by measuring liver and brain microsomal deiodination […]

TAMONE, SL; GEHRINGER, DB: Effect of eyestalk-ablation on circulating ecdysteroids in the Tanner crab, Chionoecetes bairdi Growth of decapod crustaceans is a periodic process that is under both environmental and hormonal regulation. The primary molt-promoting hormone is 20-hydroxyecdysone, a derivative of the hormone ecdysone, which is regulated by numerous factors. One important hormone, molt-inhibiting hormone […]

NELSON, W.K.; LINDER, C.J.; TSUKIMURA, B.: Effect of Methyl Farnesoate Incorporated into Feed on the Development of Tadpole Shrimp, Triops longicaudatus Triops longicaudatus, inhabitants of ephemeral pools, have a short life cycle, being reproductive one week after hatching. This life cycle was useful to examine the effects of methyl farnesoate (MF), a putative crustacean hormone, […]

VEGA, Rebecca/L; EPEL, David: Early Embryonic Programmed Cell Death in the Sea Urchin, Strongylocentrotus purpuratus: Developmental Timing, Control, and Responses to Environmental Disturbance Marine larva are exposed to a variety of biotic and abiotic stresses during development. Variations in water and light conditions, predator and prey abundance, as well as exposure to xenotoxins may all […]

HYDE, L.L.*; LARSON, B.A.: ELISA Measurement of Plasma Melatonin Levels in the Fish Fundulus heteroclitus Housed under Two LD Cycles The purpose of these studies was to (1) gain information on the feasibility of using a commercially available melatonin ELISA kit to measure melatonin in Fundulus heteroclitus and (2) determine the plasma melatonin levels throughout […]