Abstract To elucidate the osmoregulatory mechanisms underpinning invasion of fresh water by palaemonid Crustacea, we investigate contribution free amino acids (FAA) to intracellular isosmotic regulation in selected ontogenetic stages two diadromous, neotropical shrimps, Macrobrachium amazonicum and M. olfersi, exposed or saline media. We also evaluate anisosmotic/ionic extracellular regulatory capability adult alone; all data for olfersi are from McNamara et al. (2004). Adult shrimps show...

Intertidal organisms rely on physiological and behavioral adjustments to maintain homeostasis under warm exposure. We examined the effects of temperature increase related climate warming physiology behavior two fiddler crab species: Leptuca uruguayensis, which inhabits mostly vegetated areas, leptodactyla, that unvegetated areas. hypothesized L. uruguayensis would be more sensitive than leptodactyla. Crabs were exposed different temperatures: 27 °C (control), 31 33 (+4 +6 °C, respectively)...

AB Aquatic Biology Contact the journal Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsTheme Sections 7:113-122 (2009) - DOI: https://doi.org/10.3354/ab00183 Evolutionary transition freshwater by ancestral marine palaemonids: evidence from osmoregulation in a tide pool shrimp Alessandra Augusto1, Adriana Silva Pinheiro2, Lewis Joel Greene3, Helen Julie Laure3, John Campbell McNamara2,* 1Centro de Aquicultura, Universidade Estadual...

To examine osmotic regulation during long-term acclimation to a hyperosmotic medium, hemolymph osmolality, [Na+] and total protein, tissue hydration, free amino acid (FAA) pools in abdominal muscle, gills, central nervous were quantified the diadromous freshwater (FW) shrimp, Macrobrachium olfersii, direct exposure 21‰S seawater over 20-day period. Hemolymph osmolality reach stable maxima within 24 h while protein is unchanged. Muscle nerve tissues rapidly lose water gills hydrate; all...

Abstract To evaluate putative adaptive changes underpinning the invasion of freshwater by Brachyura, this investigation examines anisosmotic extra and isosmotic intracellular osmoregulatory capabilities in Dilocarcinus pagei , a neotropical, hololimnetic crab, including its embryonic juvenile phases. All ontogenetic stages show remarkable ability to survive high salinity medium (25‰, 750 mOsm/kg H 2 O, 350 mm Na + 400 mM Cl − ). Adults hyper‐regulate hemolymph osmolality up isosmoticity at...

A comparison was made of the metabolism, nitrogenous excretion, growth, oxidized energy substrate, ingestion rate, and fecal production males three morphotypes (CC, GC1, GC2) palaemonid shrimp Macrobrachiumamazonicum (Heller, 1862). The proportion these in population is fixed, individuals can change from one type to another (TC CC, CC GC1 maintain this proportion. were evaluated for 30 days, during which fed daily with commercial food. Food debris, feces, exuviae collected daily. Oxygen...

Probably as a function of their wide geographical distribution, the different population Macrobrachium amazonicum shrimp may present distinct physiological, biochemical, reproductive, behavioral, and ecological patterns. These differences are so accentuated that existence allopatric speciation has been suggested, although initial studies indicate genetic variability populations happen at an intraspecific level. Among biological responses described for M. populations, those regarding...

The aim of this study was to evaluate differences in various physiological measures (growth, fecal production, feed intake, nitrogenous excretion, oxygen consumption, energy substrate used, and budget) among males, ovigerous females non-ovigerous the freshwater prawn Macrobrachium amazonicum. This species exhibits pronounced sexual dimorphism different male morphotypes has potential for use aquaculture. Males were studied 30 days. Ovigerous 10 Prawns fed commercial food, all males...

Minuca mordax is a model for studies on ocean acidification and sea-level rise because lives in mangroves riverbanks with low pH. We investigated the physiology of crabs exposed to differents pH (6.5 5.8) salinity (25, 30, 35, 40 45S). There was not mortality or alterations hypo-osmoregulation, suggesting that factors did affect salt absorption/secretion. Reduced changed metabolism, ammonia excretion, hepatosomatic index relation animals kept control At elevated salinities, metabolism...

A technological package has been developed in South America for culturing prawn Macrobrachium amazonicum; however, little information is available on its physiology and diet. We investigated the effect of different protein levels diet (32%, 35%, 38% crude -P) feed conversion rate (FCR), hepatosomatic index (HSI), energy balance, calculated through ingested channeled toward growth, metabolism, feces, excretion, exuviae 30 days. Animals fed with 35% P more growth (8.6% intake), defecated less...

Abstract Climate changes are altering the chemistry of oceans, and knowing their effects on biology animals is urgent. Since physiological responses crustaceans may be different given seasons year, this work evaluated synergistic effect ocean acidification seasonality physiology sea-bob shrimp, Xiphopenaeus kroyeri . Experimental groups were exposed for 5 days to two levels pH, representing present-day mean ambient conditions (pH 8.0) distant-future 7.3) during summer winter. Metabolism,...

An energy budget allows an understanding about the way in which ingested is distributed among various functions. In this study, by Zoeae, Decapodids and Juveniles of M. amazonicum allocated to growth, metabolism, nitrogen excretion, feces, exuviae was measured. Also main organic substrates oxydized were determined. Feces produced estimated difference between assimilated plus excreted. Metabolism assessed based on oxygen consumption. Ammonia excretion measured using a spectrophotometer. The...

Abstract Increasing ocean acidification combined with other impacts may cause changes in homeostatic mechanisms of intertidal invertebrates. Stressors do not act isolation, and experimental work is needed to assess their synergistic potential. We evaluated the effect exposure multiple stressors on survival, osmoregulation, metabolism, Q10, excretion, hepatosomatic index, energy substrate oxidation fiddler crab Leptuca thayeri (Rathbun, 1900). Crabs were exposed two pH values (7.0, 6.3)...

We present the spectral evolution of shell Nova Vel 1999 during first 3 years after visual maximum. monitored ionization in ejecta and verified an increase about 200 days outburst. In addition, blue continuum was observed 565 outburst, which is probably due to reestablishment accretion disk system. The forbidden lines' FWHM followed shows a significant velocity decrease period. main results our study suggest that highly heterogeneous nonspherical. also estimate electron temperatures...

Bycatch refers to all the animals caught with species of economic interest. These economically unattractive are later discarded at sea. Protein hydrolysate antioxidant potential was extracted by our research group from two main fish (Paralonchurus brasiliensis and Micropogonias furnieri) shrimp fishing bycatch fauna São Paulo coast, Brazil. This study tested inclusion different concentrations (0.0, 2.5, 5.0, 10.0%) in diet Macrobrachium rosenbergii. Survival, growth, physiological processes...