Spatial distribution and seasonal variation in Undaria pinnatifida ...

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maximum of 52% of the plants measured had sporophylls at any one time. The numbers of plants with sporophylls presentat both sites collapsed from early January. No plants with sporophylls were recorded at either site in March 2012.Sporophyll volume peaked between early November and mid-December at both Westhaven Marina and Coromandel.Figure 14: Reproductive status of Undaria populations. Percentage of reproductive plants with sporophylls (A) andAverage Sporophyll Volume (B). Error bars are ± one standard error.ABAverage plant length increased steadily from June 2011 and peaked during October at Westhaven Marina and atCoromandel (Figure 15). The largest individual plants were recorded in October, with maximum sizes of 102 cm atWesthaven and 120 cm at Coromandel. Average length shows a steady decline from October as plants decay from theapex. Although no plants were seen in the survey area in Coromandel in February Undaria was seen on surroundinginfrastructure. A gradual increase in plant length is evident from February to April 2012 as new recruits appear.20
Figure 15: Average plant length at Westhaven Marina and Coromandel. Error bars are ± one standard error.Average growth rate of Undaria plants at Westhaven is shown in figure 16. The average growth rate peaked during August2011 at 0.59cm dayˉ¹. Growth rate then declined steadily down to 0.28cm dayˉ¹ in November. All tagged plants had thendied and were no longer present by December 2011.Figure 16: Average growth rate at Westhaven Marina. Error bars are ± one standard error.Note: growth was only recorded at Westhaven and from July to November 2011 as tagged plants were all gone byNovember 2011.Size frequency graphs showing plant sizes at Westhaven Marina and Coromandel are shown in Appendix 4. Plantlets(
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 and 22: Figure 10: Seawater nutrient data:
Page 23: 4.2.2 Temporal distribution and pop
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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