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Sex ratio of Pygospio elegans - Throughout the study period, females were always more abundant than males, resulting in a female-biased sex ratio (Figure 3.3). Numbers of each sex rose fairly steadily during spring to a mean density of 30.0±3.18 females and 25.0±5.2 males per core in May. However, during the summer the abundance of females increased sharply to 60±8.39 per core in July, whilst the abundance of males decreased to a mean density of 11±2.89 per core in August. This produced a sharp increase in the female:male ratio from 1.35±0.33 in May to 6.19±0.48 in October. The mean number of males increased rapidly during winter, to 41.7±2.73 per core, whilst the female density remained relatively constant. In February 1998, the female:male sex ratio was low (1.4:1±0.07), similar to that in March 1997, although the densities of each sex were higher. 70 — No of males 60 r---] No. of females 50 — 20 10 — sex ratio 7 —6 —5 — 4 ±) [J4 Er) 3 0 2 ICI Figure 3.3 : Mean numbers of male and female P. elegans (bar graph) and sex ratio (line graph) from March 1997 to February 1998 (± S.E.Mean, n=3). 70 ci)
- Page 34 and 35: Holme and McIntyre (1984). Percenta
- Page 36 and 37: Pattern Analysis - Grid Surveys Sur
- Page 38 and 39: 57 64 1=1 0 0 0 0 0 0 0 O 0 0 0 0 0
- Page 40 and 41: Maps produced by kriging and other
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- Page 44 and 45: 2.5 1.5 0.5 0 3 T (i) % Silt/clay%
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- Page 50 and 51: The results show that at the smalle
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- Page 54 and 55: (vii) G. duebeni (ix) % Organic con
- Page 56 and 57: 8m survey - spatial patterns Figure
- Page 58 and 59: (1) P. elegans (iii) L. conchilega
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- Page 62 and 63: 200m 150m 100m 50m (ix) C. edule 56
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- Page 66 and 67: DISCUSSION The main aims of this st
- Page 68 and 69: formed patches less than 1m2 and th
- Page 70 and 71: stutchbutyi, at Wirroa island, New
- Page 72 and 73: exhibited by the tube-building poly
- Page 74 and 75: CHAPTER 3 THE POPULATION STRUCTURE
- Page 76 and 77: Asexual reproduction by fragmentati
- Page 78 and 79: METHODS Survey design - It has been
- Page 80 and 81: RESULTS The species abundances in e
- Page 82 and 83: corresponds to 44 setigers using Eq
- Page 86 and 87: Reproductive activity of Pygospio e
- Page 88 and 89: P. elegans larvae at Drum Sands hav
- Page 90 and 91: Pygospio elegans showed great seaso
- Page 92 and 93: Previous studies have produced simi
- Page 94 and 95: The sole reliance on a planktonic m
- Page 96 and 97: abundance are highly seasonal, were
- Page 98 and 99: CHAPTER 4 THE EFFECTS OF MACROALGAL
- Page 100 and 101: studies may have been completely di
- Page 102 and 103: METHODS Study site - The exact posi
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- Page 106 and 107: sediment sampling, together with re
- Page 108 and 109: RESULTS Species abundances - The me
- Page 110 and 111: ; 15 35 — 30 — 25 — 10 — 5
- Page 112 and 113: statistical difference from net plo
- Page 114 and 115: Pygospio elegans size distribution
- Page 116 and 117: used, approximately equivalent to t
- Page 118 and 119: artefacts associated with the metho
- Page 120 and 121: present in high numbers around sewa
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- Page 124 and 125: CHAPTER 5 THE EFFECTS OF MACROALGAL
- Page 126 and 127: METHODS Survey design - During late
- Page 128 and 129: The sediments could not be sampled
- Page 130 and 131: RESULTS Species abundances - Table
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Sex ratio of Pygospio elegans - Throughout the study period, females were always<br />
more abundant than males, resulting in a female-biased sex ratio (Figure 3.3).<br />
Numbers of each sex rose fairly steadily during spring to a mean density of 30.0±3.18<br />
females and 25.0±5.2 males per core in May. However, during the summer the<br />
abundance of females increased sharply to 60±8.39 per core in July, whilst the<br />
abundance of males decreased to a mean density of 11±2.89 per core in August. This<br />
produced a sharp increase in the female:male ratio from 1.35±0.33 in May to<br />
6.19±0.48 in October. The mean number of males increased rapidly during winter, to<br />
41.7±2.73 per core, whilst the female density remained relatively constant. In<br />
February 1998, the female:male sex ratio was low (1.4:1±0.07), similar to that in<br />
March 1997, although the densities of each sex were higher.<br />
70 —<br />
No of males<br />
60 r---] No. of females<br />
50 —<br />
20<br />
10 —<br />
sex ratio<br />
7<br />
—6<br />
—5<br />
— 4 ±)<br />
[J4<br />
Er)<br />
3<br />
0<br />
2 ICI<br />
Figure 3.3 : Mean numbers of male and female P. elegans (bar graph) and sex ratio<br />
(line graph) from March 1997 to February 1998 (± S.E.Mean, n=3).<br />
70<br />
ci)
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