Elimination of diurnal rhythm of respiration by methyl parathion in the crab, Oziotelphusa senex senex Fabricius

Reddy, P. Sreenivasula; Bhagyalakshmi, A.

doi:10.1007/bf00192032

Cited by 4 publications

(5 citation statements)

References 3 publications

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“…Among ectotherms, circadian patterns in metabolic rate are displayed by aquatic invertebrates (Chacón et al, 2003; Rosas et al, 1992; but see Diawol et al, 2016), by fishes (Kim et al, 1997; Ross & McKinney, 1988; Svendsen et al, 2014), and by reptiles (Birchard et al, 2006; Blem & Killeen, 1993; da Cruz et al, 2008; Klein et al, 2006; Roe et al, 2004, 2005). In terrestrial arthropods, circadian rhythmicity in SMR has been exhibited by insects (Banks et al, 1975; Crozier, 1979; Shipp & Otton, 1976; Woodring & Clifford, 1986), spiders (Humphreys, 1977; but see Stoltey & Shillington, 2009), and crustaceans (Reddy & Bhagyalakshmi, 1994; Van Senus, 1985). In this study, flight‐capable (LW[f]), but not flight‐incapable (SW and LW[h]), G. lineaticeps exhibited circadian rhythmicity in SMR (Figure 1).…”

Section: Discussionmentioning

confidence: 99%

Flight capacity drives circadian patterns of metabolic rate and alters resource dynamics

Stahlschmidt

2022

J Exp Zool Pt A

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Animals must acquire, use, and allocate resources, and this balancing act may be influenced by the circadian clock and life-history strategy. Field (Gryllus) crickets exhibit two distinct life-history strategies during early adulthood-flight-capable females invest in flight muscle at a cost to ovary mass, whereas flight-incapable females instead invest solely into ovaries. In female Gryllus lineaticeps, I investigated the role of life-history strategy in resource (food) acquisition and allocation, and in circadian patterns of energy use. Flight capacity increased the standard metabolic rate (SMR) due to greater late-day SMR and flight-capable crickets exhibited greater circadian rhythmicity in SMR. Flight-capable crickets also ate less food and were less efficient at converting ingested food into body or ovary mass. Thus, investment into flight capacity reduced fecundity and the amount of resources available for allocation to other life-history traits. Given the increasing uncertainty of food availability in many global regions, work in Gryllus may clarify the important roles of food and circadian patterns in life-history evolution in a changing world.

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Section: Discussionmentioning

confidence: 99%

Flight capacity drives circadian patterns of metabolic rate and alters resource dynamics

Stahlschmidt

2022

J Exp Zool Pt A

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“…Circadian rhythms have been reported for various physiological functions and behaviors in a number of crustacean species. Endogenous circadian pacemakers modulate the sensitivity of sensory organs like the eyes (3) and caudal photoreceptors (4), determine the movements of pigments (5) and regulate blood sugar (6,7), glutathione levels (8), the capacity to take up oxygen (6,9) and the activity of effector systems such as heart rate and ventilation (10)(11)(12). Most behavioral studies investigated spontaneous locomotor activity and found a robust circadian rhythm with maxima at the beginning and ongoing activity throughout dark phases (13)(14)(15)(16)(17).…”

Section: Introductionmentioning

confidence: 99%

The circadian biology of the marbled crayfish

Reischig¹

2010

Front Biosci

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The parthenogenetic marbled crayfish (Procambarus spec.) has recently been introduced as a new preparation for neuroethological studies. Since isogeneity apparently limits inter-individual variation, this otherwise typical decapod species may be especially valuable for circadian studies. Locomotor activity of isolated marbled crayfish and agonistic activity of small social groups maintain circadian rhythmicity in constant darkness. As potential signals of circadian time information, levels of 5HT, N-acetylserotonin and melatonin were determined in brains of marbled crayfish at different daytimes. However, location and structural organization of crustacean circadian pacemakers are still elusive. Immunocytochemical and backfill studies in the marbled crayfish revealed neural structures that may correspond to portions of circadian pacemaker systems in the insect optic lobe. Position and additional chemical contents in two pigment-dispersing hormone-expressing neuron groups resembled insect pigment-dispersing factor-expressing cells in the lamina and the accessory medulla, a neuropil discussed as center for integration of timing information. Here, we discuss new findings about the possible organization of the circadian system of the marbled crayfish in the light of current knowledge about circadian clocks in crustacea.

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“…Metabolic rates in decapod crustaceans provide a reliable measure of their response to stress conditions (Reddy and Bhagyalakshmi, 1994;Aagaard, 1996). Several types of stress affect their physiology during trawl fishing (Bergmann et al, 2001).…”

Section: Introductionmentioning

confidence: 99%

Temporal modification in cardiac rhythmicity of <i>Nephrops norvegicus</i> (Crustacea: Decapoda) in relation to trawl capture stress

et al. 2005

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SUMMARY: The effects of trawling on cardiac rhythmicity of Nephrops norvegicus (L.) are still mostly unknown. Ultradian rhythms reported in previous studies may result from trawling capture stress, thus disappearing following acclimatisation to laboratory conditions. To test this hypothesis, 34 time series of cardiac activity data recorded in constant darkness were studied by Fourier analysis. Spectral decomposition of time series was obtained by defining the fundamental or circadian harmonic (CH) in 24-h together with 9 submultiples of this period. The power content (PC) of each harmonic was estimated in data segments of 24-h duration (days), giving graphic matrices of PC values over consecutive days. Values of PC for 9 submultiples were summed and studied in a block named ultradian band (UB). The modification in the PC of the CH and of the UB was evaluated during laboratory acclimatisation. A significant increase in the PC of the circadian harmonic component (CH) over consecutive days of testing was observed. These findings suggest that, rather than being a product of dim light environmental fluctuations experienced by the animals from the deep waters of the continental slope, ultradian periodicity could well be caused by the stress of capture.Keywords: Nephrops norvegicus, stress, cardiac rhythms, constant darkness, Fourier analysis, circadian and ultradian rhythms. RESUMEN: MODIFICACIÓN TEMPORAL DE LA RITMICIDAD CARDÍACA DE NEPHROPS NORVEGICUS EN RELACIÓN AL ESTRÉS DE CAP-TURA POR ARRASTRE. -Los efectos de la pesca de arrastre sobre la ritmicidad cardíaca de Nephrops norvegicus (L.) son aún desconocidos y los ritmos ultradianos descritos en estudios previos podrían ser consecuencia del estrés de captura por el arte de pesca de arrastre, desapareciendo éstos al continuar la aclimatación en el laboratorio. Para probar esta hipótesis, 34 series temporales de datos de actividad cardíaca registrados en oscuridad constante fueron estudiadas mediante análisis de Fourier. Se obtuvo la descomposición espectral de las series definiendo el armónico fundamental o armónico circadiano (CH) en 24 h junto con 9 submúltiplos de este período. Se estimó el contenido de potencia (PC) de cada armónico en segmentos de datos de 24 h de duración (días) obteniéndose matrices gráficas de valores del PC en días consecutivos. Los valores del PC de los 9 submúltiplos fueron sumados y estudiados en un bloque llamado banda ultradiana (UB). Fue evaluada la modificación diaria del PC del CH y de la UB durante la aclimatación en el laboratorio. Se observó un incremento significativo en el PC del componente armónico circadiario (CH) durante los días consecutivos. Estos hallazgos sugieren que la periodicidad ultradiana no sería producida por las fluctuaciones ambientales de luz ténue experimentadas por el animal en aguas profundas del talud continental, sino que estarían provocadas probablemente por el estrés de captura.Palabras clave: Nephrops norvegicus, estrés, ritmos cardíacos, oscuridad constante, análisis de Fourier, ritmos circadianos y...

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Elimination of diurnal rhythm of respiration by methyl parathion in the crab, Oziotelphusa senex senex Fabricius

Cited by 4 publications

References 3 publications

Flight capacity drives circadian patterns of metabolic rate and alters resource dynamics

Flight capacity drives circadian patterns of metabolic rate and alters resource dynamics

The circadian biology of the marbled crayfish

Temporal modification in cardiac rhythmicity of <i>Nephrops norvegicus</i> (Crustacea: Decapoda) in relation to trawl capture stress

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