Matter Stephen F
Department of Environmental Sciences, University of Virginia, 22902, VA, Charlottesville, USA.
Oecologia. 1996 Mar;105(4):447-453. doi: 10.1007/BF00330007.
Individual movement patterns and the effects of host plant patch size and isolation on patch occupancy were examined for red milkweed beetles, Tetraopes tetraophthalmus, residing in a heterogeneous landscape. Male beetles were found to move both more often and farther between host plant patches than female beetles, and this difference affected the patterns of patch occupancy observed. Overall, unoccupied milkweed patches were smaller and more isolated than patches occupied by beetles. Patches uninhabited by females tended to be more isolated, but not necessarily smaller, than patches with female beetles, indicating that females may be affected more by patch isolation than patch size. Presence of male beetles on patches showed a stronger response to patch size than to patch isolation. Differences in movement between males and females illustrate the need for demographically based dispersal data. Comparisons of Tetraopes interpatch movement patterns between landscapes composed of patches of different size revealed that landscapes with overall smaller patches may have greater rates of interpatch movement.
研究了生活在异质景观中的红斑纹马利筋甲虫（Tetraopes tetraophthalmus）的个体移动模式，以及寄主植物斑块大小和隔离程度对斑块占据情况的影响。结果发现，雄性甲虫在寄主植物斑块之间移动的频率更高、距离更远，这种差异影响了观察到的斑块占据模式。总体而言，未被占据的马利筋斑块比被甲虫占据的斑块更小且隔离程度更高。未被雌性甲虫占据的斑块往往比有雌性甲虫的斑块隔离程度更高，但不一定更小，这表明雌性甲虫可能比斑块大小更易受斑块隔离的影响。斑块上雄性甲虫的存在对斑块大小的反应比对斑块隔离程度的反应更强。雄性和雌性甲虫在移动方面的差异表明需要基于种群统计学的扩散数据。对由不同大小斑块组成的景观中红斑纹马利筋甲虫斑块间移动模式的比较表明，总体斑块较小的景观可能具有更高的斑块间移动速率。
