Escoriza Daniel
GRECO Institute of Aquatic Ecology University of Girona Girona Spain.
Ecol Evol. 2020 Jan 22;10(3):1592-1601. doi: 10.1002/ece3.6013. eCollection 2020 Feb.
Mediterranean islands have complex reptile assemblages, but little is known about the factors that determine their organization. In this study, the structure of assemblages of Squamata was evaluated based on their species richness and two measures of phylogenetic diversity (variability and clustering). I evaluated the composition of the assemblages comparing distinct biogeographic subregions within the Mediterranean: Adriatic, Aegean, Balearic, Corsica-Sardinia, Crete, Gulf of Gabés, Ionian Sea, Ligurian Sea, Malta, Sicily, and Tyrrhenian Sea. The effect of island environments and geographical isolation on the diversity metrics was assessed using generalized linear models. The analyses indicated that species richness was mostly influenced by island area and geographical isolation. Assemblages on smaller islands were poorer in species and phylogenetically dispersed, possibly as an effect of interspecific competition. The species composition of the assemblages was determined by similar environmental drivers within the biogeographic subregions, including island area, island elevation, geographical isolation, and aridity. In several subregions, significant patterns of phylogenetic attraction were found in species co-occurrences, caused by the limits imposed by the island size on large predatory species.
地中海诸岛拥有复杂的爬行动物群落，但对于决定其群落构成的因素却知之甚少。在本研究中，基于有鳞目动物的物种丰富度以及两种系统发育多样性指标（变异性和聚类性）对其群落结构进行了评估。通过比较地中海内不同的生物地理亚区域（亚得里亚海、爱琴海、巴利阿里群岛、科西嘉 - 撒丁岛、克里特岛、加贝斯湾、伊奥尼亚海、利古里亚海、马耳他、西西里岛和第勒尼安海）来评估群落的组成。使用广义线性模型评估岛屿环境和地理隔离对多样性指标的影响。分析表明，物种丰富度主要受岛屿面积和地理隔离的影响。较小岛屿上的群落物种较少且系统发育分散，这可能是种间竞争的结果。群落的物种组成由生物地理亚区域内相似的环境驱动因素决定，包括岛屿面积、岛屿海拔、地理隔离和干旱程度。在几个亚区域中，由于岛屿大小对大型捕食性物种的限制，在物种共现中发现了显著的系统发育吸引模式。
