We investigated the sedimentation of copepod fecal pellets in three different sea areas representing a sheltered bay, an archipelago area, and the open sea on the southwestern coast of Finland in the northern Baltic Sea. Fecal carbon sedimentation was always ,0.05% of the total sedimentation of particulate organic carbon, whereas the fecal carbon production (estimated from copepod abundance, as...

We find that the marine 87 Sr/ 86 Sr record shows a significant periodicity of 59.3 ± 3 Myr. The 87 Sr/ 86 Sr record is 171° ± 12°out of phase with a 62 (± 3) Myr periodicity previously reported in the record of marine-animal diversity. These periodicities are close to 58 (± 4) Myr cycles found for the number of gap-bounded sedimentary carbonate packages of North America We propose that these p...

Human-induced changes to river loads of nutrients and sediments pose a significant threat to marine ecosystems. Ongoing land-use change can further increase these loads, and amplify the impacts of land-based threats on vulnerable marine ecosystems. Consequently, there is a need to assess these threats and prioritise actions to mitigate their impacts. A key question regarding prioritisation is w...

Sedimentation and burial affect a variety of habitats worldwide, especially within coastal marine systems. In the Mediterranean, seagrasses like Cymodocea nodosa are commonly subjected to sedimentation and, although the response of C. nodosa has been documented, few studies have included macrofaunal responses. We used a manipulative field experiment to examine the effects of a single small-scal...

Measurements of both horizontal gradients and vertical profiles of aerosols, cloud droplets and thermodynamic parameters in the cloud topped marine boundary layer off of central California are presented. They suggest that, while aerosols can indeed modulate cloud albedo, other parameters such as sea surface temperature may similarly affect cloud albedo. Additionally, the impact of aerosols, thr...

An intercomparison of methodology and of dating results, from a counting and from the more recent g -spectrometry method, has been made for marine sediment cores from several locations. The former method involves considerable chem ical manipulation, whereas the latter is more straightforward and enables direct interpretation of the results. Similar precisions ( ; 12%) were found for both method...

HARRIS, P.T., O'BRIEN, P.E., SEDWICK, P. & TRUSWELL, E.M., 1996 (xi): Late Quaternary History of sedimentation on the Mac. Robertson Shelf, East Antarctica: problems with 14C-dating of marine sediment cores. In Banks, M.R. & Brown, M.]. (Eds): CLIMA TIC SUCCESSIONSAND GLACIAL HIS TOR YOF THE SOUTHERN HEMISPHERE OVER IRE LASTHVE MILLION YEARS. Pap. Proc. R. Soc. Tasm. 130(2): 47-53. ISSN 0080-47...

Gram-positive spore-forming sulfate reducers and particularly members of the genus Desulfotomaculum are commonly found in the subsurface biosphere by culture based and molecular approaches. Due to their metabolic versatility and their ability to persist as endospores. Desulfotomaculum spp. are well-adapted for colonizing environments through a slow sedimentation process. Because of their abilit...