Hydraulic activities by ghost shrimp Neotrypaea californiensis induce oxic−anoxic oscillations in sediments

First evidence of the Cretaceous decapod crustacean Protocallianassa from Sweden

“…In recent studies from the Upper Miocene deposits of Slovakia, Hungary and Austria, Hyžný (2011) and Hyžný et al (2015) showed that Callianassidae also produced burrows in brackish lake environments, causing significant bioturbation. The extant mud shrimp Neotrypaea californiensis excavates burrows up to 24 cm deep, and can incorporate as many as seven chambers (Volkenborn et al 2012). This is consistent with the Protocallianassa fossils from Å sen and Ivö Klack, which comprise isolated chelipeds (often represented by internal casts) but no recognizable cephalothoracic or abdominal components.…”

Mediation of macronutrients and carbon by post-disturbance shelf sea sediment communities

“…A similar effect is also true for non-cohesive sediments which, due to their inherent mobility, host a high proportion of opportunistic species (Collie et al 2000), but these communities also harbour large deep-burrowing fauna (e.g. decapod crustaceans, spatangoid urchins) that can form extensive galleries (Lohrer et al 2004) and disproportionately augment oxygen uptake (Volkenborn et al 2012) and the flux of dissolved substances across the water-sediment interface (Osinga et al 1995;Bird et al 1999;D'Andrea and DeWitt 2009). The presence of these species, in particular the spatangoid Echinocardium cordatum, offers an explanation for the enhanced [NH 4 -N] observed in noncohesive sediment communities that have experienced a high frequency of fishing activity.…”

Sedimentary Diagenesis, Depositional Environments, and Benthic Fluxes

“…A volume of sediment may be subject to multiple successive redox conditions which oscillate between oxic and anoxic, allowing for a repetitive spectrum and variable dwell times of redox reactions and reaction intermediates. This oscillating condition can itself be considered a biogeochemical state or end-member (Aller, 1994a;Volkenborn et al, 2010Volkenborn et al, , 2012. The development of optical imaging sensors (planar optodes; Glud et al, 1996) has allowed the direct visual documentation of such oscillations in two spatial dimensions and time and the quantification of the probability distributions of different redox conditions ( Figure 5; Volkenborn et al, 2010Volkenborn et al, , 2012.…”

“…This oscillating condition can itself be considered a biogeochemical state or end-member (Aller, 1994a;Volkenborn et al, 2010Volkenborn et al, , 2012. The development of optical imaging sensors (planar optodes; Glud et al, 1996) has allowed the direct visual documentation of such oscillations in two spatial dimensions and time and the quantification of the probability distributions of different redox conditions ( Figure 5; Volkenborn et al, 2010Volkenborn et al, , 2012. In addition to the introduction of O 2 into sediments by bioirrigation and physical ventilation of permeable sediments, the direct injection into overlying water of plumes of anoxic or low-O 2 water from burrows or more diffuse advective flow-through anoxic sediments results in small-scale redox oscillations and excursions in the bottom water boundary layer (Figure 5(c); Huettel et al, 1998;Volkenborn et al, 2010).…”