Spatial distribution and seasonal variation in Undaria pinnatifida ...

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BTemperature data recorded at Coromandel and Westhaven sites is shown in Figure 12. Monitoring of Undaria populationsbegan in June 2011 when the average monthly temperatures were 13.4˚C and 12.8˚C at Coromandel and WesthavenMarina respectively. Temperature then increased through until February with average monthly temperatures of 24˚C atWesthaven and 23˚C at Coromandel. From the end of February temperatures began to drop rapidly, there is a monthlyaverage in May of 16˚C at both Westhaven Marina and Coromandel as temperatures head down towards 12 ˚C in June2012.Figure 12: Average daily water temperature. Note: Coromandel temperature loggers were stolen from the monitoringsite three times during the study and hence data from this site is missing for some months.18
4.2.2 Temporal distribution and population dynamics of Undaria populationsPlant densities were much higher on a per meter square basis at Westhaven Marina compared to on mussel floats at theCoromandel study site (Figure 13). Plant densities were highly variable among floats at Coromandel but generally followedthe same temporal pattern as Westhaven Marina, with an increase from June through until November, followed by largedeclines, down to near zero, at both locations between December and February. Densities at the Coromandel site beganto increase again in April 2012.Figure 13: Average plant density at Westhaven Marina (A) and Coromandel (B). Error bars are ± one standard error.ABThe percentage of plants with reproductive tissue, sporophylls, is shown in Figure 14A and the average sporophyll volumeis shown in Figure 14B. Both sites had maximal reproductive plant numbers between early November and late December2011. At Westhaven Marina, 95% of the plants measured had sporophylls by late December, whereas at Coromandel a19
Page 1 and 2: Waikato Regional Council Technical
Page 3 and 4: Approved for release by:Peter Singl
Page 5 and 6: 11. Executive SummaryUndaria pinnat
Page 7 and 8: 2. IntroductionUndaria pinnatifida
Page 9 and 10: 3. Methods3.1. Spatial distribution
Page 11 and 12: For mapping purposes the Undaria ca
Page 13 and 14: 3.2.2. Westhaven monitoringWesthave
Page 15 and 16: Figure 4: Western Coromandel Penins
Page 17 and 18: 4.1.2. Mussel farm surveyUndaria wa
Page 19 and 20: Figure 8: Mussel length and Undaria
Page 21: Figure 10: Seawater nutrient data:
Page 25 and 26: Figure 15: Average plant length at
Page 27 and 28: 5. Discussion5.1. Spatial distribut
Page 29 and 30: perennial macroalgae. Instead, plan
Page 31 and 32: and Johnson, 2003). Through this su
Page 33 and 34: Jessop, J., (2006). An investigatio
Page 35 and 36: 5Moturua Island6101112897Koputauaki
Page 37 and 38: 33Takawhare Bay, Windy Point/Puhe R
Page 39 and 40: 3/02/2012 Kereta South 36º 54’ 1
Page 41 and 42: 2/02/2012 Manaia7/12/20116/12/20116
Page 43 and 44: Appendix 4 - Size frequency distrib

Spatial distribution and seasonal variation in Undaria pinnatifida ...

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