Atrazine, a potent herbicide for weeds removal during the growing season, has been widely used in China. It is known to be distributed aquatic ecosystems with long half-life, thus presenting potential risk species and consumers. This study analyzed concentrations of degraded atrazine residues marine organisms (N = 129) including 3 mollusks, 2 crustaceans, 15 fish from semi-enclosed bay, Jiaozho...

Carpenter et al. (1998) investigated how nutrients (i.e., phosphorus [P] input), dissolved organic carbon (DOC), and grazing are related to phytoplankton biomass and production in four manipulated lakes intensely sampled during five summers. Multivariate probability distributions of algal biomass and production were constructed for varying data on P input rates, DOC, and grazer length, where DO...

Chironomids, diatoms and microcrustaceans that inhabit aquatic ecosystems of the Northern Neotropics are abundant and diverse. Some species are highly sensitive to changes in water chemical composition and trophic state. This study was undertaken as a first step in developing transfer functions to infer past environmental conditions in the Northern lowland Neotropics. Bioindicator species abund...

The determinants of the structure, functioning and resilience of pelagic ecosystems across most of the polar regions are not well known. Improved understanding is essential for assessing the value of biodiversity and predicting the effects of change (including in biodiversity) on these ecosystems and the services they maintain. Here we focus on the trophic interactions that underpin ecosystem s...

Mesoscale eddies stimulate biological production in the ocean, but knowledge of energy transfers to higher trophic levels within eddies remains fragmented and not quantified. Increasing the knowledge base is constrained by the inability of traditional sampling methods to adequately sample biological processes at the spatio-temporal scales at which they occur. By combining satellite and acoustic...

We examined mercury concentrations in three fish assemblages to estimate biomagnification rates in the Iténez main river, affected by anthropogenic activities, and two unperturbed rivers from the Iténez basin, Bolivian Amazon. Rivers presented low to moderate water mercury concentrations (from 1.25 ng L(-1) to 2.96 ng L(-1)) and natural differences in terms of sediment load. Mercury biomagnific...

Concentrations of mercury (Hg), methylmercury (MMHg), arsenic (As), selenium (Se), and cadmium (Cd) were measured in atmospheric deposition, stream water, and biota in two streams in western Maryland. Overall, concentrations were slightly higher in the water of the lower pH Herrington Creek tributary (HRCT). Bioaccumulation factors were also higher for HRCT compared to Blacklick Run (BLK). MMHg...

We reviewed our experience of tibialis anterior transfer and anterior release for calcaneus deformity in 46 feet of 26 ambulant patients with myelomeningocele. At an average follow-up of 8.4 years (2 to 17.6) there were 89% who had satisfactory results; 64% of the patients having tibialis anterior transfers were able to stand on their toes. Hip abductor power was a good predictor of a functiona...

The purpose of this study was to determine the effect of chronic sympathetic denervation on cerebral vessels of the spontaneously hypertensive rat when superior cervical ganglionectomy was performed in adulthood. In a previous study, we have demonstrated increased protein transfer across the cerebral vessels of the chronically denervated hemisphere when superior cervical ganglionectomy was perf...

In the present study, a trophic structure model for some fish species of the northern Oman Sea is developed through using mass balance modeling software, Ecopath with Ecosim (EwE). In this model, we simulated 16 functional groups spread across an area of 3998.20 km2 from 2017 to 2018. Mean trophic level in the area of the present study was 3.49. Values calculated for system omnivory and connect...