Chesapeake Bay Abundandance Estimates

Estimates of abundance were developed for striped bass (Morone saxatilis) and spot (Leiostomus xanthurus) as part of a NOAA Chesapeake Bay Office funded research project. Estimates of abundance for striped bass were developed for four spatial, multi-stock models. The models included alternative assumptions about natural mortality and ageing error. Two spatial models were developed to estimate spot abundance: one with time-varying occupancy in the Chesapeake Bay and one with spatially-varying mortality.

Striped Bass Abundance

Striped Bass Abundance Estimation Methods

Spot Abundance

Spot Abundance Estimation Methods

GENECAP

We created GENECAP to assist the wildlife researcher or manager in efficient analysis and formatting of nuclear DNA genotypes for the purpose of population estimation. GENECAP is a Microsoft Excel macro with the primary input of multi-locus genotypes. GENECAP compares each individual multi-locus genotype with all other genotypes within the dataset to determine matching genotypes. One major feature of GENECAP is the ability to include genotypes with missing scores for loci. After matches are determined, GENECAP creates capture histories and calculates match probabilities in a worksheet that can then be used to derive population estimates in such programs as CAPTURE (White et al. 1982) and MARK (White and Burnham 2000). In addition, GENECAP calculates allele frequencies, probability of identity (PI) values, reports genotypes that are problematic, and multi-locus genotypes that differ by 1 and 2 alleles. GENECAP is no longer being maintained.
(last updated 10-1-2010) - Fixed problem with reporting 1 and 2 allele mismatches.

Download GENECAP

Download User Manual

Download MEN paper on GENECAP