Estimation of forest biomass using spaceborne SAR data is an active field of investigation. C-band backscatter is known to provide little information on biomass because of the weak sensitivity to forest biophysical properties. However, if a large multitemporal dataset is used, it should be possible to improve the estimation. This assumption has been tested with ENVISAT ASAR Wide Swath (WS) data...

In this paper we continue our systematic analysis of the operatorial approach previously proposed in an economical context and we discuss a mixed toy model of a simplified stock market, i.e. a model in which the price of the shares is given as an input. We deduce the time evolution of the portfolio of the various traders of the market, as well as of other observable quantities. As in a previous...

Fisheries agencies around the Baltic Sea use hydroacoustics to assess stock sizes of herring and sprat. These assessments rely on the assumption that the acoustic properties of Baltic clupeids are the same as North Sea herring. This may lead to biased results, as system-specific differences in salinity and fish fat content may influence acoustic target strength. The acoustic properties of the B...

Manuscript accepted 17 August 1999. Fish. Bull. 98:75–85 (2000). Abstract.–For fish populations with an annual breeding cycle, a biological reference point based on the Leslie matrix is presented and compared with percent maximum spawning potential (%MSP) and Fmed reference points. For deterministic population projections, the reference point is defined as the level of fishing mortality (Fst) t...

EXECUTIVE SUMMARY Terms of Reference (TOR): 1. Characterize the commercial catch including landings and discards. Characterize recreational landings. This TOR was completed. See Section 2.0. 2. Estimate fishing mortality and total stock biomass for the current year and characterize the uncertainty of those estimates. 3. Evaluate and either update or re-estimate biological reference points as ap...

Forests have a vital role in maintaining global climate stability by removing greenhouse gases like carbon dioxide from environment. Estimation of stock is crucial quantifying the amount that present forest. The estimation forest biomass and through field measurements challenging timeconsuming task. Here this scenario, our study aims to estimate area using hybrid technique i.e., aerial survey g...

The intrinsic population growth rate (r) of the surplus production function used in the biomass dynamic model and the steepness (h) of the stock-recruitment relationship used in age-structured population dynamics models are two key parameters in fish stock assessment. There is generally insufficient information in the data to estimate these parameters that thus have to be constrained. We develo...