Landscape-scale spatial heterogeneity in phytodetrital cover and megafauna biomass in the abyss links to modest topographic variation

被引：40
作者：
Morris, Kirsty J. [1 ]
Bett, Brian J. [1 ]
Durden, Jennifer M. [1 ,2 ]
Benoist, Noelie M. A. [1 ,2 ]
Huvenne, Veerle A. I. [1 ]
Jones, Daniel O. B. [1 ]
Robert, Katleen [1 ,2 ]
Ichino, Matteo C. [1 ,2 ]
Wolff, George A. [3 ]
Ruhl, Henry A. [1 ]
机构：
[1] Univ Southampton Waterfront Campus, Natl Oceanog Ctr, European Way, Southampton SO14 3ZH, Hants, England
[2] Univ Southampton, Natl Oceanog Ctr Southampton, Ocean & Earth Sci, European Way, Southampton SO14 3ZH, Hants, England
[3] Univ Liverpool, Sch Environm Sci, Liverpool L69 3BX, Merseyside, England
来源：
SCIENTIFIC REPORTS | 2016年 / 6卷
基金：
英国自然环境研究理事会;
关键词：
NE ATLANTIC; ORGANIC-CARBON; TEMPORAL VARIABILITY; DEEP; MATTER; SEDIMENTS; COMMUNITY; DYNAMICS; CORALS; PLAIN;
D O I：
10.1038/srep34080
中图分类号：
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号：
07 ; 0710 ; 09 ;
摘要：
Sinking particulate organic matter (POM, phytodetritus) is the principal limiting resource for deepsea life. However, little is known about spatial variation in POM supply to the abyssal seafloor, which is frequently assumed to be homogenous. In reality, the abyss has a highly complex landscape with millions of hills and mountains. Here, we show a significant increase in seabed POM % cover (by similar to 1.05 times), and a large significant increase in megafauna biomass (by similar to 2.5 times), on abyssal hill terrain in comparison to the surrounding plain. These differences are substantially greater than predicted by current models linking water depth to POM supply or benthic biomass. Our observed variations in POM % cover (phytodetritus), megafauna biomass, sediment total organic carbon and total nitrogen, sedimentology, and benthic boundary layer turbidity, all appear to be consistent with topographically enhanced current speeds driving these enhancements. The effects are detectable with bathymetric elevations of only 10 s of metres above the surrounding plain. These results imply considerable unquantified heterogeneity in global ecology.
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页数：10
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