Sources of diel variation in energetic physiology in an Arctic-breeding, diving seaduck

2015 ◽  
Vol 216 ◽  
pp. 39-45 ◽  
Author(s):  
Rolanda J. Steenweg ◽  
Holly L. Hennin ◽  
Joël Bêty ◽  
H. Grant Gilchrist ◽  
Tony D. Williams ◽  
...  
Keyword(s):  
Diel Variation ◽  
Energetic Physiology

Diel variation of limnological parameters in a reservoir in northeastern Brazil (Boa Esperança, Maranhão/Piauí): Rainy period

2007 ◽  
Vol 12 (1) ◽  
pp. 35-42 ◽  
Author(s):  
Paulo Roberto Saraiva Cavalcante ◽  
Maria do Socorro Rodrigues ◽  
Marcel Felipe Sousa Barroso ◽  
Ricardo Barbieri ◽  
Carmen Lúcia Martins Serra ◽  
...  
Keyword(s):  
Northeastern Brazil ◽  
Diel Variation ◽  
Rainy Period ◽  
Limnological Parameters

scholarly journals Quantifying seasonal and diel variation in Anopheline and Culex human biting rates in Southern Ecuador

2017 ◽  
Vol 16 (1) ◽  
Author(s):  
Sadie J. Ryan ◽  
Catherine A. Lippi ◽  
Philipp H. Boersch-Supan ◽  
Naveed Heydari ◽  
Mercy Silva ◽  
...  
Keyword(s):  
Diel Variation ◽  
Southern Ecuador

scholarly journals Soil moisture modifies the response of soil respiration to temperature in a desert shrub ecosystem

2014 ◽  
Vol 11 (2) ◽  
pp. 259-268 ◽  
Author(s):  
B. Wang ◽  
T. S. Zha ◽  
X. Jia ◽  
B. Wu ◽  
Y. Q. Zhang ◽  
...  
Keyword(s):  
Soil Moisture ◽  
Soil Respiration ◽  
Seasonal Cycle ◽  
Northwest China ◽  
Interactive Effects ◽  
Co2 Efflux ◽  
Diel Variation ◽  
Desert Ecosystems ◽  
Volumetric Soil Water Content ◽  
Desert Shrub

Abstract. The current understanding of the responses of soil respiration (Rs) to soil temperature (Ts) and soil moisture is limited for desert ecosystems. Soil CO2 efflux from a desert shrub ecosystem was measured continuously with automated chambers in Ningxia, northwest China, from June to October 2012. The diurnal responses of Rs to Ts were affected by soil moisture. The diel variation in Rs was strongly related to Ts at 10 cm depth under moderate and high volumetric soil water content (VWC), unlike under low VWC. Ts typically lagged Rs by 3–4 h. However, the lag time varied in relation to VWC, showing increased lag times under low VWC. Over the seasonal cycle, daily mean Rs was correlated positively with Ts, if VWC was higher than 0.08 m3 m−3. Under lower VWC, it became decoupled from Ts. The annual temperature sensitivity of Rs (Q10) was 1.5. The short-term sensitivity of Rs to Ts varied significantly over the seasonal cycle, and correlated negatively with Ts and positively with VWC. Our results highlight the biological causes of diel hysteresis between Rs and Ts, and that the response of Rs to soil moisture may result in negative feedback to climate warming in desert ecosystems. Thus, global carbon cycle models should account the interactive effects of Ts and VWC on Rs in desert ecosystems.

Diel Variation of Hydrochemistry and Carbon Flux in the Banzhai River, SW China

2021 ◽  
Author(s):  
Shi Yu ◽  
Shiyi He ◽  
Zhenyu Liu ◽  
Pingan Sun ◽  
Haiyan Zhu
Keyword(s):  
Carbon Fixation ◽  
Carbon Sink ◽  
Sampling Period ◽  
Sampling Interval ◽  
Diel Variation ◽  
Migration Process ◽  
Karst Terrain ◽  
13C Isotope ◽  
Carbon Pump ◽  
In Situ Sensors

Abstract This study was undertaken in the Banzhai, a small groundwater-fed stream flowing over carbonate karst terrain in the southwest of Guizhou, China. To assess the biogeochemical processes behind carbon fluxes and sinks and calculate the end-member contribution to the geological carbon sink, samples were collected at a 2-h sampling interval during a two-day period, and the diel-variation of δ13CDIC, δ13CPOC, and C/N were analyzed. During the sampling period, temperature, pH, electrical conductivity (EC), dissolved oxygen (Do), and chlorophyll were measured at a 15-min interval using in situ sensors. The results showed that (1) the hydro-chemical variations reflected the photosynthesis of subaquatic plants and degassing. These processes likely turned a part of HCO3- to organic carbon, which subsequently precipitated. (2) The 13C isotope ratios indicated a varying intensity of photosynthesis and degassing during the HCO3- migration process. Moreover, subaquatic plants changed their metabolic pathway from C3 to C4 carbon fixation due to the lack of CO2 in the water and utilized HCO3- in the water as their carbon source. (3) The net carbon sink flux was 1784.54 kg CO2, where carbonate weathering, the biological carbon pump, and weathering of silicate rocks accounted for 85.80 %, 13.64 %, and 0.56 %, respectively. (4) In the Banzhai ground river, the DIC during the migration process was mainly lost through degassing, allogenic acid, and consumption by photosynthesis of subaquatic plants.

Diel variation in vertical distribution of hairtails caught by vertical longlines

2017 ◽  
Vol 53 (2) ◽  
pp. 126-131 ◽  
Author(s):  
Mun-Kwan KIM ◽  
◽  
Su-Hyeon PARK ◽  
Hyeong-Cheol KANG ◽  
Tae-Cheol OH ◽  
...  
Keyword(s):  
Vertical Distribution ◽  
Diel Variation

scholarly journals Diel Variation in Abundance and Size of the South American Red Shrimp Pleoticus Muelleri (Spence Bate, 1888) (Decapoda, Solenoceridae) in the Ubatuba Region, Southeastern Brazil

2014 ◽  
Vol 62 (3) ◽  
pp. 225-234
Author(s):  
Mateus Lopes ◽  
Adilson Fransozo ◽  
Antonio Leão Castilho ◽  
Rogerio Caetano da Costa
Keyword(s):  
Catch Rate ◽  
Southeastern Brazil ◽  
Sediment Type ◽  
Diel Variation ◽  
South American ◽  
Bottom Temperature ◽  
The South ◽  
Kolmogorov Smirnov ◽  
Mean Size

Diel variation in the abundance and size of Pleoticus muelleri in the Ubatuba region was investigated during 2000. During each season of the year, sampling was conducted during the day and at night at 8 depths, from 5 to 40 m. The estimated number of shrimp was 955 individuals, 272 collected during the day and 683 at night. There was a difference in the abundance of P. muelleri between day and night (χ², p=2.33E-40). The abundance during the day and at night differed by season with the exception of the spring (χ², p=0.06). The abundance during both periods also differed by depth, except at 15 and 30 m, where it was not significant (χ², p=0.84 and 0.06, respectively). The shrimp caught at night were generally smaller than those caught during the day (Kolmogorov-Smirnov, p<0.01). Pleoticus muelleri juveniles were found primarily at night. This tendency could have influenced the lower mean size for this period. The sediment type and the bottom temperature appear to influence the behavior of this species and consequently the catch rate during the periods analyzed.

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