Monitoring Rusty Crayfish in Southern Ontario Streams and Rivers

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Recommendations for Monitoring• combination of seining with either handpickingor electrofishing would:– permit a variety of habitat conditions to besampled– improve likelihood of species detection– broad range of size classes– additional information on fishes• removal sampling not reliable for estimatingpopulation density– frequent lack of depletion across samplingpasses– generally low estimates of capture prob.
Threat to Endangered Queensnake?Queensnake, Regina septemvittata• medium-sized, semi-aquatic snake• restricted distribution in SW Ontario• freshly molted crayfish nearly 100% of its diet• extremely vulnerable to changes in preyavailability
Page 6 and 7: MethodsField sampling• removal sa
Page 8 and 9: Population Size & Catchability70.86
Page 13 and 14: Sampling Method10m1m- study reach l
Page 15 and 16: Variation in River Crayfish Fauna2C
Page 17 and 18: Implications for Queensnake?• pre

Monitoring Rusty Crayfish in Southern Ontario Streams and Rivers

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