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emmarrogers

Study shows crayfish exhibit anxiety-like behavior when stressed - 0 views

phys.org/...ty-like-behavior-stressed.html

crayfish HSR-2025 HSR environmental biology behavioralscience behavior

shared by emmarrogers on 26 Sep 24 - No Cached
  • Spontaneous behavior of unstressed crayfish in the aquatic dark/light plus-shaped maze
    • emmarrogers
      emmarrogers on 26 Sep 24
       
      video of crayfish in maze
  • The researchers found that when the stressed crayfish were placed into the tank, they tended to avoid the well lit wings
  • a protective sort of behavior
emmarrogers

Herbicide concentrations in the Mississippi River Basin-the importance of chloroacetani... - 0 views

www.sciencedirect.com/...S0048969703005084

crayfish HSR-2025 HSR environmental pesticide

shared by emmarrogers on 12 Sep 24 - No Cached
  • eethylatrazine
  • deisopropylatrazine
  • atrazine
    • emmarrogers
      emmarrogers on 12 Sep 24
       
      Atrazine is one of the main pesticides used in Agriculture
  • ...2 more annotations...
  • DEA was detected in 61%, and DIA was detected in 42% of water samples collected from the Mississippi River at Baton Rouge
  • In 1991, alachlor ESA concentrations ranged from 0.2 to 0.9 μg/l, whereas alachlor concentrations ranged from 0.05 to 0.1 μg/l for multiple samples collected from the mouth to the headwaters of the Mississippi River
emmarrogers

Sustaining America's Aquatic Biodiversity - Crayfish Biodiversity and Conservation | VC... - 0 views

www.pubs.ext.vt.edu/...420-524.html

crayfish HSR HSR-2025 behavioralscience environmental

shared by emmarrogers on 11 Sep 24 - No Cached
  • Crayfish are ecologically and economically valuable animals.
  • nearly 75 percent crayfish.
  • Crayfish are important indicators of water quality
  • ...1 more annotation...
  • sensitive to water pollution
emmarrogers

Overlooked keystone species in conservation plans of fluvial ecosystems in Southeast Eu... - 0 views

www.kmae-journal.org/...kmae210127.html

crayfish HSR HSR-2025 questions

shared by emmarrogers on 11 Sep 24 - No Cached
  • Since crayfish species are known to cover a wide spectrum of ecological functions they are considered as keystone species and ecosystem engineers. Therefore, their decline may substantially impair local biodiversity and ecosystem services.
emmarrogers

Trends in pesticide concentrations and use for major rivers of the United States - Scie... - 0 views

www.sciencedirect.com/...S0048969715302928

HSR-2025 environmental pesticide crayfish

shared by emmarrogers on 11 Sep 24 - No Cached
  • The pesticides include the herbicides cyanazine, alachlor, atrazine and its degradate deethylatrazine (DEA), metolachlor, and simazine; and the insecticides chlorpyrifos, malathion, diazinon, carbofuran, and carbaryl.
  • All 11 compounds are among the top 20 most frequently detected in US streams and rivers
emmarrogers

Analysis of pesticides in surface water, stemflow, and throughfall in an agricultural a... - 0 views

www.sciencedirect.com/...S0045653518311913

HSR HSR-2025 science environmental chemistry pesticide

shared by emmarrogers on 11 Sep 24 - No Cached
  • The highest pesticide concentration observed was 10.50 μg/L of metolachlor
  • sticide in surface water and stemflow samples was metolachlor (0.09–10.5 μg/L), h
  • he most commonly detected pesticide in throughfall samples was biphenyl (0.02–0.07 μg/L).
emmarrogers

Herbicides in Water Sources: Communicating Potential Risks to the Population of Mangaun... - 0 views

www.ncbi.nlm.nih.gov/...PMC10302186

shared by emmarrogers on 13 Sep 24 - No Cached
  • The mean concentrations of atrazine, metolachlor, simazine and terbuthylazine were 0.02 mg/L, 0.01 mg/L, 0.03 mg/L and 0.02 mg/L, respectively
  • Algae and invertebrates were also sensitive to atrazine,
  • Their corresponding average concentrations were 0.02 mg/L, 0.12 mg/L, 0.03 mg/L, and 0.01 mg/L.
  • ...1 more annotation...
  • The mean concentrations of atrazine, metolachlor, simazine, and terbuthylazine were 0.03 mg/L, 0.01 mg/L, 1.82 mg/L, and 0.06 mg/L
emmarrogers

Acute toxicity of triazine pesticides to juvenile signal crayfish (Pacifastacus leniusc... - 0 views

pubmed.ncbi.nlm.nih.gov/24362090

crayfish HSR-2025 HSR pesticide environmental

shared by emmarrogers on 13 Sep 24 - No Cached
  • The aim of this research was to evaluate the acute toxicity of atrazine, hexazinone, metribuzine, prometryne, simazine, and terbutryne
  • 96hLC50
    • emmarrogers
      emmarrogers on 17 Sep 24
       
      96 hours for the lethal concentration to kill 50 percent of the population
  • mg.l-1
    • emmarrogers
      emmarrogers on 17 Sep 24
       
      Milligrams per litre
emmarrogers

Acute exposure to chlorpyrifos and glyphosate induces changes in hemolymph biochemical ... - 0 views

pubmed.ncbi.nlm.nih.gov/31055068

shared by emmarrogers on 25 Sep 24 - No Cached
  • glyphosate
    • emmarrogers
      emmarrogers on 25 Sep 24
       
      this is the most common herbicide in use agriculturally, and in common use. The trade name for this herbicide is Round up, which is a very common herbicide.
  • 49.55 ± 4.66 μg L-1
  • 7.83 ± 0.50 mg L-1
Kylie John

Drought-induced injury is associated with hormonal alteration in Kentucky bluegrass - PMC - 0 views

www.ncbi.nlm.nih.gov/...PMC6768267

HSR-2025 HSR botany hormones lawngrass

shared by Kylie John on 20 Sep 24 - No Cached
  • Mature KBG (cv. ‘Wildhorse’) plugs (10 cm diameter, 5 cm deep)
  • The grass was transplanted into pots (15 cm diameter, 15 cm deep, with 8 holes on the bottom) filled with either top soil and sand mixture (2:1, v/v). A piece of plastic screen was placed in the bottom of the pot to prevent soil from leaching.
  • at optimum conditions (mean±SD) at 22 ± 0.8/16 ± 0.6°C (day/night), 70%±8% relative humidity, PAR at 400 ± 9 µmol m−2 s−1 and 12-h photoperiod. Nitrogen was applied at 2 g m−2 (from 28–8-18 complete fertilizer with micronutrients) at transplanting and then 1 g m−2 biweekly on all treatments until the end of the trial.
  • ...22 more annotations...
  • trimmed at 7 cm and irrigated two times a week to field capacity.
  • Six weeks after transplanting
  • For drought stress treatment, the amount of irrigation water was determined based on evapotranspiration (ET) loss by weighing the pots every other day and the irrigation was provided to compensate 30% to 50% ET loss. ET was determined by weighing the pots.
  • VWC was reduced from 34.6% to 27.9% between day 0 and day 7, from 27.9% to 23.4% between day 7 and day 14, from 23.4%% to 14.5% between day 14 to day 21, and from 14.5% to 5.1% between day 21 and day 28.
  • Leaf chlorophyll was extracted with acetone and measured using a spectrophotometer
  • Leaf photosynthetic rate and stomatal conductance were measured using a portable photosynthetic system
  • turf quality started to decline at day 7 due to drought stress.
  • Drought stress reduced turf quality rating by 14.8% relative to the control at the end of drought stress (28 d).
  • The electrolyte leakage increased gradually from day 7 through day 21 due to drought stress.
  • Drought stress increased electrolyte leakage by 35.6% at day 14, 95.7% at day 21, and 105.4% at day 28 when compared to the control.
  • chlorophyll began to decline after day 7 due to drought stress
  • educed chlorophyll content by 39.0% relative to the control.
  • photosynthetic rate due to drought stress was observed as early as day 7
  • Stomatal conductance decline was first observed at day 4 of drought stress
  • day 28 when drought stress reduced stomatal conductance by 84.4%
  • The ZR level declined gradually from day 14 through day 28 due to drought stress. Drought stress reduced ZR by 28.5% at day 14, 35.1% at day 21, and 59.1% at day 28 relative to the control.
  • 1 week after ZR did. At the end of drought stress (day 28), drought stress reduced iPA by 50.4% relative to the control.
  • Drought stress reduced leaf IAA by 14.3% and 26.7% at day 21 and day 28, respectively, when compared to the control.
  • The ABA started to accumulate after day 4 of drought stress and the difference between drought stress and the control was observed as early as 7 d of drought stress
  • The ABA content gradually increased from day 7 through day 28. Drought stress increased leaf ABA by 23.6% at day 7, 30.7% at day 14, 87.6% at day 21, and 108.5% at day 28 relative to the control.
  • drought stress did not impact leaf GA4 content
  • We found that ABA/CK increased sharply from day 14 through day 28 due to increase in ABA and decline in CK (ZR + iPA) during the same period. At the end of trial (day 28), drought stress induced an increase in leaf ABA/CK ratio by 3.4-fold relative to the control.
emmarrogers

Effect of Chronic Exposure to Prometryne on Oxidative Stress and Antioxidant Response i... - 0 views

www.ncbi.nlm.nih.gov/...PMC3976930

crayfish pesticide HSR-2025 HSR environmental biology behavioralscience

shared by emmarrogers on 20 Sep 24 - No Cached
  • oxidative stress
    • emmarrogers
      emmarrogers on 20 Sep 24
       
      Is this the same a phycological stress, or is it a different kind of stress?
emmarrogers

Effects of Prometryn Exposure on Hepatopancreas Oxidative Stress and Intestinal Flora i... - 0 views

www.ncbi.nlm.nih.gov/...PMC10451815

crayfish pesticide HSR-2025 HSR environmental biology behavioralscience

shared by emmarrogers on 20 Sep 24 - No Cached
  • Eriocheir sinensis
    • emmarrogers
      emmarrogers on 20 Sep 24
       
      Chinese mitten crab
  • alternative to atrazine due to its low toxicity
  • In addition, due to its low toxicity to fish, prometryn can be applied directly to aquatic activities for the removal of harmful algae and weeds in aquaculture waters
  • ...3 more annotations...
  • However, there is a paucity of studies on the negative effects of prometryn on aquatic crustaceans.
  • could affect the physiological behavior of crustacean aquatic organisms
  • Previous studies have shown that the commonly used herbicides glyphosate and atrazine are capable of causing oxidative stress,
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