survival results |

*A. baeza* | high, mid and low | nest extinction | logrank (Mantel-Cox) test | H: 14, M: 18, L: 15 | *Χ*^{2} | 41.37 | <0.0001 | as predicted: high>mid>low |

*A. baeza* | high and mid | proportion of spiders remaining | HLM (mixed) | H: 12, M: 9 | *F* | 11.74 | 0.007 | as predicted: high>mid |

dispersal results |

*A. baeza* | high and mid | number of propagules | HLM (mixed) | H: 18, M: 17 | *F* | 7.96 | 0.009 | as predicted: high>mid |

*A. baeza* | high and mid | propagule survival | logrank (Mantel–Cox) test | H: 47, M: 18 | *Χ*^{2} | 2.88 | 0.045 | as predicted: high>mid |

rain exclosure |

*A. baeza* | low, exposed versus covered | proportion of spiders remaining | HLM (GLIMMIX) | C: 22, O: 22 | *F* | 3.68 | 0.032 | as predicted: covered>exposed |

*A. baeza* | low, exposed versus covered | number of web strands on plant | HLM (mixed) | C: 17, O: 19 | *F* | 5.58 | 0.05 | as predicted: covered>exposed |

*A. eximius* | low, exposed versus covered | proportion of spiders remaining | Wilcoxon test | C: 11, O: 10 | *Χ*^{2} | 0.24 | 0.31 | as predicted: covered>exposed |

*A. eximius* | low, exposed versus covered | nest volume | *t*-test | C: 11, O: 11 | *T* | 1.85 | 0.04 | as predicted: covered>exposed |

predation |

*A. baeza* | high, mid and low | presence/absence of ants | two-sided nested model | H: 18, M: 17, L: 50 | *Χ*^{2} | 26 | 0.038 | as predicted: high<mid<low |

*A. baeza* | high, mid and low | presence/absence of spiders | two-sided nested model | H: 18, M: 17, L: 50 | *Χ*^{2} | 42.9 | 0.0002 | opposite of predicted: high>mid>low |