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- This is !HowMany, version 0.01 (28 March 1995)
-
-
- Intro:
- ======
-
- The Capture/Mark/Release method
- ================================
-
- This program is designed to illustrate a technique used to estimate the
- number of individual animals in a population, in a closed environment. In
- this case the animals are fish, in a pond.
-
- The program on start up determines a sensible random number for the
- population of fish. The user is invited to position the pointer over the
- pond, and click to catch a sample of fish. The numbers are shown. When the Tag
- button is pressed, the fish are tagged and released. This operation is
- repeated a number of times, 5 by default.
-
- At this point the pond is left for a period of time, during which the fish
- are assumed to have dispersed in a random way.
-
- Five more catches are made, and some are caught tagged and some not. The
- proportion that are tagged is assumed to be the same as the proportion
- tagged in the whole pond.
-
- The computer, and indeed the user now has the data to estimate the population
- of fish in the pond.
-
-
-
- It is the total caught in second catch * total tagged in first batch
- -----------------------------------
- tagged fish in second batch
-
-
- The computer puts up the raw data, so that students can try to work it out.
- It then shows the user both the estimate, and the actual number in the
- population.
-
- This technique is widely used in environmental biology, and can be used in
- other closed ecosystems.
-
- The program enables the user to start again, and assigns the pond a
- different number of fish.
-
-
- Copyright
- =========
- This program is Public Domain. It may be distributed or
- copied freely as long as no part of this software may is used in any other
- program, whether commercial or public domain, without my prior written
- consent, though any files created by this software are not bound by this
- condition. This software may not be distributed for a profit, save that
- required to cover packaging and media costs..
-
- Copyright (©) is retained by the author, who may be contacted at the address
- beneath. No liability can be accepted by the author for any loss or damage
- arising from use or misuse of this software.
-
- The Fractal trees are copyright of RiscUser and used with their permission.
-
- EventShell
- =========
-
- Thanks to Paul Hobbs for his very useful !EventShell System.
-
- This application uses the library of routines of the above name, which
- provide an easy way of genereating a Wimp Program.
-
- I recommend this system which can be obtained from APDL or other PD
- Libraries.
-
- This program has been written using the routines supplied with the EvntShell
- library which is copyright Paul Hobbs. The library routines may be
- distributed subject to the following conditions:
-
- You have permission to use any part or the whole library in a project you
- intend to place in the public domain, as long as I am fully credited (via
- the inclusion of this file in the program documentation). If you wish to use
- these routines in a program that is for sale (for however much and for
- whatever reasons) or released as copyright material then my express
- permission in writing must be obtained. I maintain copyright on all the
- material supplied and reserve the right to amend these conditions in cases
- where I deem misuse.
-
- The library code is supplied free of charge to everyone 'as is'. There is no
- guarantee that it is free from bugs and no warranty is given about its
- suitability for use.
-
- Further details about EvntShell may be obtained from the author:
-
- Paul Hobbs Rheinpfalzstrasse 2 85049 Ingolstadt Germany
-
- The heap manager routines used by EvntShell are copyright Risc User and are
- used with permission.
-
- -----------------------------------------------------------------------------
- Any improvements or bugs, please report to :-
-
- Robert Seago.
-
- 40 Alton Park Road
- Clacton On Sea
- Essex.
-
- CO15 1ED
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