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Inproceedings Reference How ‘Shaun the sheep’ looked like in the past? Evolution and archaeological diversity of sheep morphotypes in Southwest Asia
Sheep husbandry has played a leading role in the economy of human societies over the last 10 millennia. While archaeological research focused on the study of early husbandry practices, little is known about the emergence and morphological evolution of sheep breeds. To what extent ancient sheep bones could help to understand this change and identifying the factors behind it? To answer these questions, we used 3D geometric morphometrics methods on 260 astragalus of modern and archaeological sheep from Southwest Asia and East Africa. Ancient sheep bones have been recovered from forty-two archaeological sites covering seven millennia of economic and cultural transformations, between the 8th and the 1st millennium BC. We have explored morphometric diversity of sheep bones, first according to biotic and abiotic factors on well-documented modern osteological collections and second, according to environmental, chronological and socio-economical contexts on modern and ancient bones. Our first results indicate significant differences in the variation of astragalus shape between modern and archaeological sheep in correlation with ecological and chronocultural factors.
Located in Library / RBINS Staff Publications 2023
Inproceedings Reference How do macrofaunal activities impact biogeochemical cycling in anthropogenically disturbed sediment?
Marine coastal areas are important for ecosystem functioning because they provide a wealth of goods and services. Hence, it is a major challenge nowadays to understand and predict how human activities will affect marine sediment communities, benthic biogeochemical cycling and the link between them. In this study, we investigate biogeochemical fluxes and the contribution of macrofaunal activities (bioturbation and bio-irrigation) in sediment ranging from muddy to coarse, including two coarse sediment stations affected by human activity (installation of an offshore windfarm and aggregate extraction). For each station, we conducted triplicate closed-core incubations to measure oxygen, nutrients and DIC fluxes as well as bioirrigation rates by following the decreasing concentration of bromide in the water column over time. After the incubation, the macrofaunal community was identified and the bioturbation potential of the community calculated (BPc). Our results show the highest Sediment Community Oxygen Consumption (SCOC) in a fine sandy station inhabited by an abundant bioirrigating and bioturbating macrofaunal community and characterized by relatively high organic matter content. In the muddy station, the SCOC was 4 times lower and the DIC efflux much higher than the SCOC reflecting anaerobic mineralization processes happening in absence of bioirrigators. Within the coarse sediment stations characterized by poor organic matter content and inhabited by a limited macrofaunal community, the undisturbed station shows the highest irrigation rates associated with moderate SCOC and DIC efflux. In the disturbed stations, irrigation rate, SCOC and DIC efflux were low suggesting that physical disturbance decreases the efficiency of mineralization processes in coarse sediments. The overall results show that irrigation of the sediment affects biogeochemical cycling along a range of coastal sediments.
Located in Library / RBINS Staff Publications 2017
Webpublished Reference How does landscape vegetation configuration regulate local channel initiation in rapidly expanding marsh?
Biogeomorphic interactions between tidal channels and marsh plants play a crucial role in enhancing coastal resilience to climate change. Previous studies linking the channel formation with vegetation dynamics predominantly focused on the early initiation, characterized by local-scale plant-flow feedbacks. However, the influence of rapid changes in landscape-scale vegetation pattern on the channel initiation remains poorly understood, especially in micro-tidal system. In this study, we investigated this relationship through biogeomorphic modeling combined with the analysis of satellite images in a rapidly expanding marsh in China under Spartina alterniflora invasion. The satellite images demonstrated the increase in drainage density and the decrease in unchanneled path length following plant encroachment. Our modeling results showed that local flow acceleration between vegetation patches was insufficient to initiate channels rapidly before the merging of isolated patches under micro-tidal conditions. With plant expansion, the continuous marsh caused landscape flow diversion from homogenous platform flow to concentrated channel flow, which promoted evident tributary channel initiation in the landward marsh zone. The vegetation removal scenarios further highlighted that the flow divergence from adjacent platforms due to the spatial heterogeneity in plant configuration amplified the magnitude of local hydrodynamics and further channel incision. Our findings emphasize that the initiation of tidal channels not only depends on local plant-flow interaction but is largely driven by landscape vegetation configuration under micro-tidal conditions.
Located in Library / RBINS Staff Publications 2024
Proceedings Reference How is benthic biogeochemical cycling affected by sediment fining arising from human activities?
Located in Library / RBINS Staff Publications 2018
Inproceedings Reference How is connectivity of flatfish impacted by reproductive strategy?
Located in Library / RBINS Staff Publications 2016
Inproceedings Reference How is connectivity of flatfish impacted by reproductive strategy?
Located in Library / RBINS Staff Publications 2016
Inproceedings Reference How is connectivity pattern of hard substrate species impacted by artificial structures in the North Sea?
Located in Library / RBINS Staff Publications 2017
Conference Reference How is the connectivity of sole larvae affected by wind and temperature changes in the Southern North Sea?
Connectivity throughout the life cycle of flatfish remains an open question, especially at the early life stages. Also the impact of anthropogenic factors, such as climate change, on larval dispersal remains poorly known. The case of sole (Solea solea) is of particular interest because it is one of the most valuable commercial species in the North Sea. It is important to understand how the retention/dispersal of larvae would be affected by climate change in order to propose appropriate measures for the management of the North Sea stock. The transport of sole larvae from the spawning grounds to the nurseries is driven by hydrodynamic processes but the final dispersal pattern and larval abundance may be affected by behavioural and environmental factors. An increase of temperature could affect for instance the spawning period, the duration of the pelagic stage and the mortality of eggs and larvae. Modifications in the magnitude, variability and/or direction of the wind regime might affect egg and larval retention and dispersal through changes in the hydrodynamics. We compare scenarios of a particle-tracking transport model (IBM) coupled to a 3D hydrodynamic model (COHERENS) to investigate the impact of climate change, through temperature increase and wind regime change. The model has been implemented in the area between 48.5°N-4°W and 57°N-10°E over the period 1995 to 2010. Sensitivity of connectivity between spawning grounds and nurseries to climate change is assessed by estimating the impact of hypothetical (i) temperature increase and (ii) changes in wind magnitude/direction.
Located in Library / RBINS Staff Publications
Inproceedings Reference How larval dispersal of flatfish is impacted by life traits?
Located in Library / RBINS Staff Publications 2016
Inproceedings Reference How larval traits impact connectivity: example of 6 commercial flatfish species in North Sea
Located in Library / RBINS Staff Publications 2017