The ecology and conservation of threatened damselflies

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Table 2.8 Significant predictors of gross lifetime movement (log10) by I. pumilio derived by multiple regression. The F-value and associated P-value, df, R 2 and adjusted R 2 are shown. For each significant variable the P-value derived from ttests, parameter estimates and standard errors (SE) are shown (* P
log10 distance (m) 1.9 1.8 1.7 1.6 1.5 1.4 1.3 1.2 1.1 1.0 Males Females d N G R Figure 2.10. The effect of sex on mean distance moved for each of the movement parameters considered. log 10 d 1.5 1.4 1.3 1.2 1.1 1.0 0.9 1 2 3 4 5 6 7 Order of movement Figure 2.11. Effect of order of movement on log10 mean distance moved. Error bars represent 95 per cent confidence intervals. 2.3.5 Direction of movements The direction of first mature movements for each individual in 2005 is summarised in Fig. 2.12. There was a slight tendency for individuals to move along the axis eastnorth-east to west-south-west (circular mean of movement direction = 209°, where north - 0°) which was the direction of the main watercourse across the site and the orientation of the distribution of suitable habitat. However, there were many tributaries Science Report – The ecology and conservation of threatened damselflies 31
Page 1 and 2: The ecology and conservation of thr
Page 3 and 4: Science at the Environment Agency S
Page 5 and 6: their survival rates. Ischnura pumi
Page 7 and 8: Contents 1 Introduction 1 1.1 Conse
Page 9 and 10: 1 Introduction This report presents
Page 11 and 12: eputed to be capable of long range
Page 13 and 14: (Fraser 1941; Fox 1987). It rapidly
Page 15 and 16: Cordero Rivera and Andrés 1999), a
Page 17 and 18: 1.6 Dispersal One of the reasons fo
Page 19 and 20: In Chapter 4, the results of popula
Page 21 and 22: if a conservation effort is to be m
Page 23 and 24: 2.2 Methods 2.2.1 Study sites The p
Page 25 and 26: Figure 2.3. Above: an illustration
Page 27 and 28: Table 2.1 Movement parameters calcu
Page 29 and 30: (a) (b) Figure 2.4. (a) Capture loc
Page 31 and 32: % Recaptured 80 60 40 20 0 2005 200
Page 33 and 34: Table 2.4 Total numbers of adult I.
Page 35 and 36: Nine individuals were captured in t
Page 37: N (Log 10 ) 2.0 1.8 1.6 1.4 1.2 1.0
Page 41 and 42: Figure 2.12. Rose diagrams showing
Page 43 and 44: habitat and stepping-stone habitat
Page 45 and 46: fence” hypothesis (Hestbeck 1982;
Page 47 and 48: 2.4.5 Conservation implications The
Page 49 and 50: may have niches that are narrower t
Page 51 and 52: Table 3.1 Table of site names and c
Page 53 and 54: Plant species were grouped to reduc
Page 55 and 56: NMDS2 DCA2 -2.0 -1.5 -1.0 -0.5 0.0
Page 57 and 58: distributed variables were subjecte
Page 59 and 60: Table 3.4 Plant species occurring i
Page 61 and 62: CCA2 -2 -1 0 1 2 shade water Ac L.q
Page 63 and 64: GLM analysis supported the results
Page 65 and 66: Proportion male 0.55 0.60 0.65 0.70
Page 67 and 68: 3.4 Discussion 3.4.1 Odonate habita
Page 69 and 70: that shade alone reduced dragonfly
Page 71 and 72: Figure 3.5. From top left to bottom
Page 73 and 74: water and females between 130 and 1
Page 75 and 76: 4 Estimating survival rates and pop
Page 77 and 78: epeat sightings of individuals on s
Page 79 and 80: environmental conditions and to var
Page 81 and 82: 4.2.5 Model specification In all an
Page 83 and 84: atio test of JMV vs. CAS was perfor
Page 85 and 86: Recapture probability 1.0 0.8 0.6 0
Page 87 and 88: Values of deviance, AIC, difference
Page 89 and 90:
Table 4.3 Probability of transition
Page 91 and 92:
Estimates and error bars representi
Page 93 and 94:
Population size (HT estimate) 1200
Page 95 and 96:
The 2006 population did not exhibit
Page 97 and 98:
survival would be expected as the e
Page 99 and 100:
log 10 time (days) 1.8 1.6 1.4 1.2
Page 101 and 102:
and engorge on the internal tissues
Page 103 and 104:
15 directly followed days of relati
Page 105 and 106:
captures by the minimum handling ti
Page 107 and 108:
smaller effort-per-site requirement
Page 109 and 110:
Thompson 2005). The species is also
Page 111 and 112:
5.3 Results 5.3.1 Itchen Initial GO
Page 113 and 114:
Survival 1.0 0.8 0.6 0.4 0.2 0.0 Ma
Page 115 and 116:
Figure 5.3. Maximum likelihood esti
Page 117 and 118:
Numbers Numbers 14000 12000 10000 8
Page 119 and 120:
5.4.2 Itchen Estimated survival rat
Page 121 and 122:
also more variable during this time
Page 123 and 124:
The calculated daily survival value
Page 125 and 126:
Table 5.6. Sex ratio of C. mercuria
Page 127 and 128:
5.4.5 Summary Coenagrion mercuriale
Page 129 and 130:
considerably. It includes the first
Page 131 and 132:
The lack of observations of the upw
Page 133 and 134:
The indicated high mortality of imm
Page 135 and 136:
These are the first estimates of su
Page 137 and 138:
References Åbro, A., 1990. The imp
Page 139 and 140:
Cham, S. A., 1990. A study of Ischn
Page 141 and 142:
Daly, D., Waltham, K., Mulley, J.,
Page 143 and 144:
Hambler, C. & Speight, M. R., 1996.
Page 145 and 146:
Léonard, N. J., Forbes, M. R. & Ba
Page 147 and 148:
Remsburg, A. J., Olson, A. C. & Sam
Page 149 and 150:
Strange, A. M., 1999. Distribution
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The ecology and conservation of threatened damselflies

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