Rojas Carlos, Schnittler Martin, Biffi Daniella, Stephenson Steven L
Department of Biological Sciences, University of Arkansas, Fayetteville, Arkansas 72701, USA.
Mycologia. 2008 Nov-Dec;100(6):843-50. doi: 10.3852/07-197.
The eumycetozoan genus Ceratiomyxa appears to have a cosmopolitan distribution, although two of the three macroscopic species within the genus have been reported only from tropical regions of the world. In theory these two tropical species might be expected to display more narrow niches than their cosmopolitan counterpart due to their specialization for tropical environments. However ecological data documenting niche separation in eumycetozoans are largely lacking. As part of several investigations carried out in the neotropics the ecology of the three macroscopic species of Ceratiomyxa was studied. The results from in situ measurements of environmental factors associated with their fructifications reveal a clear separation of niches between the two tropical species, which might be an indication of resource partitioning within the genus. As expected in theory the cosmopolitan C. fruticulosa shows the broadest niche of the three species. Moreover the niche overlap value between C. morchella and C. sphaerosperma along with results from a multivariate CDA analysis seem to indicate that these two species are more specialized than C. fruticulosa.
黏菌纲的鹿角黏菌属似乎具有全球分布，尽管该属三个宏观物种中的两个仅在世界热带地区有报道。理论上，由于这两个热带物种对热带环境的适应性，它们可能比分布广泛的同类物种表现出更狭窄的生态位。然而，目前很大程度上缺乏记录黏菌生态位分离的生态数据。作为在新热带地区进行的几项调查的一部分，对鹿角黏菌属的三个宏观物种的生态学进行了研究。与其子实体相关的环境因素的原位测量结果表明，这两个热带物种之间存在明显的生态位分离，这可能表明该属内存在资源分配现象。正如理论预期的那样，分布广泛的鹿角黏菌在这三个物种中表现出最广泛的生态位。此外，皱柄鹿角黏菌和球形鹿角黏菌之间的生态位重叠值以及多变量CDA分析的结果似乎表明，这两个物种比鹿角黏菌更具专一性。
