Mangrove biodiversity survey south of the Onilahy River - Frontier ...

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Density (m² per hectare) 0.005 0.004 0.003 0.002 0.001 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 Figure 9 Graph to show the density of L. racemosa in each transect in the Lavadanora mangal. Where more than one quadrat was sampled the results are displayed from left to right for each transect. Error bars = 95% confidence interval. Transect number 4 3.5 3 Density (m² per hectare) 2.5 2 1.5 X. granatum A. marina B. gymnorrhiza R. mucronata L. racemosa 1 0.5 0 T1Q1 T2Q1 T2Q2 T3Q1 T3Q2 T3Q3 T3Q4 T4Q1 T4Q2 T4Q3 T5Q1 T5Q2 T5Q3 T6Q1 T6Q2 T7Q1 T8Q1 T9Q1 T9Q2 T9Q3 T10Q1 T10Q2 T10Q3 T11Q1 T11Q2 T11Q3 T12Q1 T13Q1 T13Q2 T13Q3 T14Q1 T15Q1 T16Q1 T17Q1 T18Q1 Transect and Quadrat numbers Figure 10. Graph to show the comparative density of each tree species in each quadrat in the Lavadanora mangal. Error bars = 95% confidence interval. In addition to X. granatum accounting for the greatest basal area and density in the mangal it also has the maximum density of any species within a surveyed quadrat (see Table 3). Species Maximum density (m²/ha) X. granatum 1.764 A. marina 0.419 B. gymnorrhiza 0.079 R. mucronata 0.078 L. racemosa 0.003 Table 3. Showing the maximum density of each species within a surveyed quadrat. 15
No. of trees / ha Area of mangal (ha) Total number of trees X. granatum Adults 1,620 ± 347 80 129,600 ± 27,760 Saplings 1,011 ± 479 80 80,880 ± 38,320 Seedlings 574 ± 184 80 45,920 ± 14,720 Adults 229 ± 101 80 18,320 ± 8,080 A. marina B. gymnorrhiza R. mucronata Saplings 20 ± 21 80 1,600 ± 1,680 Seedlings 34 ± 38 80 2,720 ± 3,040 Adults 83 ± 77 80 6,640 ± 6,160 Saplings 94 ± 60 80 7,520 ± 4,800 Seedlings 611 ± 472 80 48,880 ± 37,760 Adults 11 ± 11 80 880 ± 880 Saplings 0 80 0 Seedlings 0 80 0 Adults 9 ± 12 80 720 ± 960 L. racemosa Saplings 6 ± 11 80 480 ± 880 Seedlings 3 ± 6 80 240 ± 480 Table 4. Showing the number of trees per hectare. This figure was multiplied by the total area of the mangal excluding creeks to give the total number of trees in the mangal per species. ± 95% confidence interval. Table 4 shows an average number of trees per hectare for each of the species surveyed in this mangal. By multiplying this by the area of the mangal (~80ha) an assessment of the total number of trees in the mangal can be made. X. granatum was the most abundant species in the mangal with a total number of 256,400 ± 80,800 trees including adults saplings and seedlings, followed by B. gymnorrhiza with 63,040 ± 48,720 trees, A. marina had 22,640 ± 12,800 trees, L. racemosa had 1,440 ± 2,320 trees, and the least abundant species in the mangal was R. mucronata with 880 ± 880 trees. This is also depicted in Figure 11. 16
Page 1 and 2: Frontier Madagascar Environmental R
Page 3 and 4: Suggested Technical Paper citation:
Page 5 and 6: TABLE OF CONTENTS: List of Tables:
Page 7 and 8: LIST OF FIGURES Figure 1. Showing a
Page 9 and 10: EXECUTIVE SUMMARY Madagascar posses
Page 11 and 12: Miller, Ms. Sophie Miller, Mr. Thom
Page 13 and 14: Where zonation of species does occu
Page 15 and 16: CHAPTER TWO: THE LAVADANORA MANGAL
Page 17 and 18: Other • All environmental damage
Page 19: The densities of each species in ea
Page 23 and 24: 1400 1200 1000 Height (cm) 800 600
Page 25 and 26: Discussion Figure 4 shows a detaile
Page 27 and 28: Results Figure 16 shows a detailed
Page 29 and 30: Density (m² per hectare) 200 180 1
Page 31 and 32: Figure 20. Graph to show the densit
Page 33 and 34: Figure 22 shows the dominance of A.
Page 35 and 36: 100% 80% Percentage 60% 40% Seedlin
Page 37 and 38: 120 Percentage of species present 1
Page 39 and 40: throughout this mangal (see Figure
Page 41 and 42: Methods The surveys were carried ou
Page 43 and 44: 1000 900 800 700 Height (cm) 600 50
Page 45 and 46: CHAPTER FIVE: CONCLUSIONS Compariso
Page 47 and 48: 1400 1200 1000 Height (cm) 800 600
Page 49 and 50: REFERENCES Battistini R., Jouannic

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