bioturbation


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bioturbation

[¦bī·o·tər′bā·shən]
(geology)
The disruption of marine sedimentary structures by the activities of benthic organisms.
References in periodicals archive ?
bioturbation, wave ripples, thick-walled macrofauna, etc.) indicates a short-lived gravitational settling event of sediment from suspension, rather than a gradual shift of the shore facies within the basin.
This impact of bioturbation on global biogeochemistry likely affected animal evolution through expanded ocean anoxia, high atmospheric CO2 levels and global warming and possibly contributed to a number of mass extinction events.
Organic coatings on pore walls suggest that social soil fauna, such as termites or ants, are important contemporary agents of bioturbation, leading to the possibility that some pore infillings may be parna pellets transported or redistributed by these fauna.
Zalasiewicz J, Waters CN and Williams M (2014) Human bioturbation, and the subterranean landscape of the anthropocene.
The common sedimentary structures such as trough cross bedding, plannar lamination, tabular cross bedding and herringbone are observed in grey sandstone units that clearly indicates strong fluvial system whereas hummocky cross stratification, ripple cross lamination and, bioturbation indicate marginal marine facies.
In many cases the massive aspect is probably due to homogenization derived from intense bioturbation. Some of the massive marly levels also show evidences of reworking, supported by the presence of bioclasts and/or reworked fossils, mainly of brachiopods, belemnites, bivalves, crinoids and ammonites, which are in cases concentrated in bioclastic rills.
Vertical distribution pattern for nauplii and Acari could be associated to predation pressure and bioturbation in surficial sediment where the competition for habitat and fresh food supply is very high.
The following search words or terms were used: ecosystem function, ecological function, amphibian, reptile, tadpole, frog, toad, caecilian, salamander, lizard, snake, caiman, turtle, tortoise, role, bioturbation, decomposition, primary/secondary production, sediment, consumption, nutrient cycling, nutrient flow, excretion, biological control, mosquito control, diet, predation, food habit, seed dispersal, seed ingestion, dispersers, frugivore, saurocory, pollination, foraging, and flower.
clarkii may be a source of bioturbation (Mueller 2007, Yamamoto 2010), however, results in this study showed no significant difference in turbidity between the RR and the NRR.
From our observations across multiple ROV surveys, we determined that the microtopographic complexity in the unconsolidated sandy sediments at the study depths primarily resulted from bioturbation. Bioturbation in this context refers to deviations from the plane of the sediment-water interface (such as ridges and mounds, burrows and hole) created by the movement of organisms such as sea stars and fishes or organisms such as mud urchins through the upper centimeters of the sediment.
The Lower Siwalik Subgroup comprises medium-to very fine-grained grey sandstone and variegated mudstone showing bioturbation. The mudstone proportion exceeds that of the sandstone in the lower part and becomes subequal in the middle part while fine- to coarse-grained sandstone dominates in the upper part.