Effects of an Inadvertent Introduction of Northern Pike on an Established Fish Community Modified from Case 8 in Murphy et al. (2010)

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Presentation transcript:

Effects of an Inadvertent Introduction of Northern Pike on an Established Fish Community Modified from Case 8 in Murphy et al. (2010)

N Sandhill Region of Nebraska

West Long Lake 25-ha natural lake Shallow (mean D=1.2 m, max D=1.8 m) Vegetation ~80% of surface area in mid-summer Historically, Yellow Perch, Bluegill, Largemouth Bass, Black Bullhead

Northern Pike Invasion Year 1 – two fish (34 & 37 cm) Year 5 – 36 fish/ha, 22kg/ha Typical biomasses –9.5 (L. Windermere) –11.6 (Wisconsin) –18.4 (Colorado)

Group Think/Research Describe the diet of NOP. Do NOP select prey by species or size? What impact do NOP have on prey populations?

Fish Community Indices Bluegill –Fyke nets Yellow Perch –Fyke nets Largemouth Bass –Night electrofishing Year 1 Year 5 (predict) Year 5 (actual) CPUE > stock (80 mm)28.2 (4.5) PSD68 (9) PSD-P40 (10) Mean length (mm) at age 2121 (3.5) Mean length (mm) at age 3157 (5.4) Year 1 Year 5 (predict) Year 5 (actual) CPUE > stock (200 mm)143.7 (32.1) PSD29 (9) PSD-P9 (6) Mean length (mm) at age 3227 (3.5) Mean length (mm) at age 4270 (9.3) Mean length (mm) at age 5304 (5.3) Year 1 Year 5 (predict) Year 5 (actual) CPUE > stock (130 mm)14.2 (2.9) PSD74 (9) PSD-P62 (10) Mean length (mm) at age 2151 (3.8) Mean length (mm) at age 3181 (5.6)

Group Think For each species … –Describe the population from the metrics. –Predict (with explanation) how you think each of the metrics would change in year 5 after the discovery of NOP.

Group Think Instructor will provide actual Year 5 results. For each species … –Describe the population in year 5 from the metrics. –How did the metrics change form year 1 to year 5 after the discovery of NOP? –Did anything surprise you (i.e., were your predictions upheld)?