Means for (A) seed size (area in mm 2 ), (B) percentage of seed germination, and (C) multiplicative fitness estimates (w) for the different pollination treatment performed in Guánica and Mona Island. Error bars are standard error of the mean. Different letters indicate significant differences (Tukey's post hoc tests, P < 0.05) among treatments.

Means for (A) seed size (area in mm 2 ), (B) percentage of seed germination, and (C) multiplicative fitness estimates (w) for the different pollination treatment performed in Guánica and Mona Island. Error bars are standard error of the mean. Different letters indicate significant differences (Tukey's post hoc tests, P < 0.05) among treatments.

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Insular pollination systems are more extinction-prone and vulnerable to invasive species than mainland ones. They often have plants with reproductive mechanisms allowing for self-compatibility and low species-rich communities of pollinators. Here, we document different reproductive traits of the tropical tree Guaiacum sanctum on two insular populat...

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... (χ 2 1,59 = 4.74, P = 0.09). The mean value for the ISI index for G. sanctum was 0.60 and 0.63 in Guánica and Mona respectively. These ISI values were not significantly different between the two islands (t = -0.29, df =18, P = 0.77). Finally, significant differences were detected for seed size among treatments (χ 2 2,89 = 13.22, P < 0.001, Fig. 6A). Seeds produced via selfing were significantly smaller than seeds from outcross-and openpollination treatments (P < 0.05 in all cases), but this pattern was the same on both islands (χ 2 1,89 = 1.12, P = 0.29, Fig. ...
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... df =18, P = 0.77). Finally, significant differences were detected for seed size among treatments (χ 2 2,89 = 13.22, P < 0.001, Fig. 6A). Seeds produced via selfing were significantly smaller than seeds from outcross-and openpollination treatments (P < 0.05 in all cases), but this pattern was the same on both islands (χ 2 1,89 = 1.12, P = 0.29, Fig. ...
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... germination rates were low (< 50%) regardless of pollination treatment and island. Moreover, no significant differences were detected for the percentage of seed germination when comparing the different pollination treatments (χ 2 2,59 = 0.76, P = 0.68) and islands (χ 2 1,59 = 0.87, P = 0.39, Fig. 6B). Significant differences were observed when comparing the multiplicative fitness among pollination treatments (χ 2 2,59 = 14.76, P < 0.001, Fig. 6C). In Guánica, multiplicative fitness was highest for the outcrossed (wx = 1.5) and open progenies (wn = 1.6) compared to the selfed progeny (ws = 0.43). A similar pattern was found on ...
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... no significant differences were detected for the percentage of seed germination when comparing the different pollination treatments (χ 2 2,59 = 0.76, P = 0.68) and islands (χ 2 1,59 = 0.87, P = 0.39, Fig. 6B). Significant differences were observed when comparing the multiplicative fitness among pollination treatments (χ 2 2,59 = 14.76, P < 0.001, Fig. 6C). In Guánica, multiplicative fitness was highest for the outcrossed (wx = 1.5) and open progenies (wn = 1.6) compared to the selfed progeny (ws = 0.43). A similar pattern was found on Mona, where the multiplicative fitness was highest for the outcrossed (wx = 0.9) and open progenies (wn = 0.97) relative to the selfed progeny (ws = ...
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... Fig. 6C). In Guánica, multiplicative fitness was highest for the outcrossed (wx = 1.5) and open progenies (wn = 1.6) compared to the selfed progeny (ws = 0.43). A similar pattern was found on Mona, where the multiplicative fitness was highest for the outcrossed (wx = 0.9) and open progenies (wn = 0.97) relative to the selfed progeny (ws = 0.40; Fig. 6C). These results also showed a significant island effect (χ 2 1,59 = 6.33, P = 0.01, Fig. 5C), indicating that Guánica has significantly higher multiplicative fitness than Mona for the outcrossed and open progenies (P < 0.05 in all ...