154 J. Patino‐Martinez et al.
FIG. 1 Maio Island, Cabo Verde, West Africa, showing the eight geographical divisions according to the eight points of the compass, used to examine consistency in loggerhead turtle Caretta caretta nesting site selection. Nesting habitats (km of sandy beaches) available and monitored in each study area were NNE= 3.3, ENE = 2.4, ESE = 2.5, SSE = 3.6, SSW = 8.0, WSW= 6.2, WNW= 2.6 and NNW= 6.2. The per cent values within the curved arrows indicate the observed re-nesting rates within each of the eight areas. The pyramids of circles represent the relative abundance of loggerhead turtle nests (one pyramid, ,5%; two pyramids, 5–10%; three pyramids, 10–15%; seven pyramids, 30–35%). The circle on the inset map shows the location of Cabo Verde off the West African coast.
TABLE 1 Loggerhead turtle Caretta caretta nesting zone selection matrix on Maio Island, Cabo Verde, during 2012–2019. The island was divided into eight geographical areas according to the eight points of the compass (Fig. 1). ‘From’ is the first nesting area chosen by a single female. ‘To’ is the location of the next nesting record for the same female. The number in each cell indicates the number of events of each specific behaviour. R is the per cent of re-nesting events in the same area; n is the absolute number of re-nesting events per area. The diagonal line of cells highlighted in dark grey indicates the number of re-nesting events in the same area. The cells highlighted in light grey indicate the most commonly chosen new area in each case (note that the selection of new sites is mostly on the east coast at ENE and ESE).
To
From NNE
ENE ESE SSE
SSW
NNE ENE 3
3
1 1 0 0
WSW 0 WNW 0 NNW 0
Results
Geographical distribution of nesting We observed 34,253 aborted nesting attempts and 28,848 successful nesting events at Maio Island during 2012–2019.Ofthe 1,060 females monitored that had three or more re-nesting activities, 77%
601 173 71 19 35 14 16
ESE 1
244 662 95 34 29 17 17
SSE SSW WSW WNW NNW R (%) 1
0
35 27 77 29 16 6 3
26 42 45
129 24 1 6
0
15 11 10 10 83 12 9
0 8
10 5 5
19 45 2
0 4 8 2 0 2 0 6
37.5 64.3 70.9 25.2 57.1 39.9 47.4 10.2
n 8
934 934 305 226 208 95 59
dispersed their nests by up to 15 km (Table 2) both between and within nesting seasons. Female loggerhead turtles did not re-nest randomly in the different geographical areas of the island, but tended to re-nest frequently on the east coast of the island (east-south-east 70.9% and east-north- east 64.3%) and less frequently elsewhere (north-north-west
Oryx, 2023, 57(2), 152–159 © The Author(s), 2022. Published by Cambridge University Press on behalf of Fauna & Flora International doi:10.1017/S0030605321001496
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