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From biggest to smallest mud dragons: size-latitude trends in a group of meiobenthic animals worldwide
Organisms Diversity & Evolution ( IF 1.9 ) Pub Date : 2021-01-06 , DOI: 10.1007/s13127-020-00471-y
Diego Cepeda , Fernando Pardos , Nuria Sánchez

Size-latitude trends in the meiobenthic phylum Kinorhyncha, commonly known as mud dragons, have been explored in oceans worldwide. Generalized least squares regression was used to assess relationships between size and latitude, as well as between size, latitude, and two selected environmental variables that exhibit latitudinal gradation: the sea surface temperature and the net primary productivity. Different structures of spatial autocorrelation and potential confounding factors, such as the species richness and the number of kinorhynch records that could affect latitudinal gradients, were also addressed. In addition, generalized mixed models were used to determine the influence of the phylogeny on body size. Size-latitude relationships of Kinorhyncha were commonly found globally, as well as for particular geographic regions (hemispheres and/or coastlines), with important differences between taxonomic groups. These size-latitude trends were heterogeneous and implied the influence of the latitude itself, environmental variables, and phylogeny. These facts indicate that a single underlying process is not likely to explain the observed relationships but a complex interaction of several macroecological patterns both present and past. Perhaps, the inclusion of future new reports, conducted in undersampled areas, may shed some light on the matter and reveal more generalized size-latitude patterns. Nevertheless, it is also likely that broadly generalizable size-latitude relationships may not exist in meiofaunal communities.



中文翻译:

从最大的泥龙到最小的泥龙:全球一群底栖动物的大小-纬度趋势

在世界范围内的海洋中,已发现了俗称泥龙的中底栖动物Kinorhyncha的大小-纬度趋势。广义最小二乘回归用于评估大小与纬度之间以及大小,纬度与两个表现出纬度等级的选定环境变量之间的关系:海表温度和净初级生产力。还探讨了空间自相关的不同结构和潜在的混杂因素,例如物种丰富度和可能影响纬度梯度的亲缘关系记录数。此外,使用广义的混合模型来确定系统发育对体型的影响。Kinorhyncha的大小-纬度关系在全球范围内普遍存在,以及特定地理区域(半球和/或海岸线),并且在分类组之间存在重大差异。这些大小-纬度趋势是异质的,暗示了纬度本身,环境变量和系统发育的影响。这些事实表明,单个基础过程不太可能解释所观察到的关系,而是当前和过去的几种宏观生态模式的复杂相互作用。也许,包括在抽样不足地区进行的未来新报告的发布可能会对此有所启发,并揭示出更普遍的大小-纬度模式。然而,在平原的社区中,可能也可能不存在广泛可概括的大小-纬度关系。这些大小-纬度趋势是异质的,暗示了纬度本身,环境变量和系统发育的影响。这些事实表明,单个基础过程不太可能解释所观察到的关系,而是当前和过去的几种宏观生态模式的复杂相互作用。也许,包括在抽样不足地区进行的未来新报告的发布可能会对此有所启发,并揭示出更普遍的大小-纬度模式。然而,在平原的社区中,可能也可能不存在广泛可概括的大小-纬度关系。这些大小-纬度趋势是异质的,暗示了纬度本身,环境变量和系统发育的影响。这些事实表明,单个基础过程不太可能解释所观察到的关系,而是当前和过去的几种宏观生态模式的复杂相互作用。也许,包括在抽样不足地区进行的未来新报告的发布可能会对此有所启发,并揭示出更普遍的大小-纬度模式。然而,在平原的社区中,可能也可能不存在广泛可概括的大小-纬度关系。这些事实表明,单个基础过程不太可能解释所观察到的关系,而是当前和过去的几种宏观生态模式的复杂相互作用。也许,包括在抽样不足地区进行的未来新报告的发布可能会对此有所启发,并揭示出更普遍的大小-纬度模式。然而,在平原的社区中,可能也可能不存在广泛可概括的大小-纬度关系。这些事实表明,单个基础过程不太可能解释所观察到的关系,而是当前和过去的几种宏观生态模式的复杂相互作用。也许,包括在抽样不足地区进行的未来新报告的发布可能会对此有所启发,并揭示出更普遍的大小-纬度模式。然而,在平原的社区中,可能也可能不存在广泛可概括的大小-纬度关系。

更新日期:2021-01-07
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