Based on the assumptions of the Petersen Method, why might the mark-recapture me
ID: 174152 • Letter: B
Question
Based on the assumptions of the Petersen Method, why might the mark-recapture method be more accurate in the pond setting compared to a stream or river? [2 pt; L2; II.B]
it is easier to catch fish in a lake than in a stream or river
a lake is a fairly stable environment, whereas rivers and streams are in motion and so the population is much more dynamic
the tags get caught on rocks in rivers or streams and kill the fish which messes up the population estimate; this happens less in lakes
it is harder to randomize selection of fishing locations in a stream or river because they are uniform environments, whereas a lake is a more varied environment
it is easier to catch fish in a lake than in a stream or river
a lake is a fairly stable environment, whereas rivers and streams are in motion and so the population is much more dynamic
the tags get caught on rocks in rivers or streams and kill the fish which messes up the population estimate; this happens less in lakes
it is harder to randomize selection of fishing locations in a stream or river because they are uniform environments, whereas a lake is a more varied environment
Explanation / Answer
The mark-recapture method is more accurate in the pond setting compared to a stream or river because a lake is a fairly stable environment, whereas rivers and streams are in motion and so the population is much more dynamic
The reasons for this are
The river plain systems have significant forested areas which are regularly inundated and contribute significantly to production of larger individuals of some fish species. and this biotope is not found in true lakes,
High rate of turbid water input in river restricts phytoplankton concentration in riversand the , benthic algal production is comparitively less in lakes.
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