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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
Inproceedings Reference PS document How larval traits of six flatfish species impact population connectivity?
Located in Library / RBINS Staff Publications 2018
Inproceedings Reference How much does a tropical forest elevational gradient contribute to biodiversity? Insights from the ant communities of Mt. Wilhelm.
Mountain slopes are known to promote the diversity and endemism of most taxa. Consequently, turnover of species is expected to be increased along elevational gradients compared to more uniform lowland areas of tropical forests. Mt. Wilhelm, the highest peak of Papua New Guinea, represents one of the last complete altitudinal forest transects with high-levels of biodiversity and pristine forests all along. We studied species diversity and distribution of the Mt. Wilhelm ant communities from 200 m a.s.l. up to tree line at 3700 m a.s.l., using a wide scope of sampling techniques. For the first time, the ants were sampled across different forest strata and at equally spaced elevational bands (500 m a.s.l.) along the complete gradient (257 species in total). The ants occurred up to 2700 m a.s.l. with general decline of their abundance and species richness with altitude, but not in the same way across forest strata. While the species occurrences linearly declined on the ground, they were highest at mid elevations on the vegetation. Species richness peaked at mid altitudes in all strata. Species composition varied both with sampled stratum and elevation, and there was an increase of soil-nesting species sampled on vegetation with increasing altitude. Most species occurred only in one or two elevational sites and there was no difference in the mean elevational range between ground-nesting and arboreal-nesting species. A simple model based on the species accumulation curves suggested that the Mt. Wilhelm ant species richness is two-fold increased, if rarefied to and compared with the same number of individuals as sampled in the lowlands. Our study demonstrates that pristine rainforests of Mt. Wilhelm considerably boost species diversity and endemism, and as such they should be of high conservation priority.
Located in Library / RBINS Staff Publications 2019
Inproceedings Reference How much does a tropical forest elevational gradient contribute to biodiversity? Insights from the ant communities of Mt. Wilhelm.
Mountain slopes are known to promote the diversity and endemism of most taxa. Consequently, turnover of species is expected to be increased along elevational gradients compared to more uniform lowland areas of tropical forests. Mt. Wilhelm, the highest peak of Papua New Guinea, represents one of the last complete altitudinal forest transects with high-levels of biodiversity and pristine forests all along. We studied species diversity and distribution of the Mt. Wilhelm ant communities from 200 m a.s.l. up to tree line at 3700 m a.s.l., using a wide scope of sampling techniques. For the first time, the ants were sampled across different forest strata and at equally spaced elevational bands (500 m a.s.l.) along the complete gradient (257 species in total). The ants occurred up to 2700 m a.s.l. with general decline of their abundance and species richness with altitude, but not in the same way across forest strata. While the species occurrences linearly declined on the ground, they were highest at mid elevations on the vegetation. Species richness peaked at mid altitudes in all strata. Species composition varied both with sampled stratum and elevation, and there was an increase of soil-nesting species sampled on vegetation with increasing altitude. Most species occurred only in one or two elevational sites and there was no difference in the mean elevational range between ground-nesting and arboreal-nesting species. A simple model based on the species accumulation curves suggested that the Mt. Wilhelm ant species richness is two-fold increased, if rarefied to and compared with the same number of individuals as sampled in the lowlands. Our study demonstrates that pristine rainforests of Mt. Wilhelm considerably boost species diversity and endemism, and as such they should be of high conservation priority.
Located in Library / RBINS Staff Publications 2019
Conference Reference How much of the sole early life stage mortality variabiltiy is explained by egg and larval dispersal and by mismatch with algal bloom in the North Sea?
Located in Library / RBINS Staff Publications
Conference Reference How sensitive is sole larval dispersal in the North Sea to the parametrization of larval duration? A modelling study.
Connectivity throughout the life cycle of flatfish remains an open question, especially at the early life stages. 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 crucial to understand how the spawning grounds and nurseries are connected and what are the processes influencing larval retention and dispersal in order to propose appropriate management measures. Especially, dispersal during the larval stage is still poorly known. 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 at nurseries might be affected by biological processes and environmental factors. Larval Transport Models (LTMs) coupled to Individual-Based Models (IBMs) are more and more commonly used to assess the relative contribution of these processes on the larval dispersal. IBMs allow to take into account growth to estimate the duration of dispersal based on environmental conditions met by the larvae. These models may be sensitive to process parametrization and may give different results for parametrizations derived from the same data set. The Larvae&Co model (Lacroix et al., 2013) used in the frame of B-FishConnect project couples the 3D hydrodynamic model Coherens with an IBM of sole larvae. It is used here to investigate the impact of parametrization of the stage duration on the dispersal of sole larvae in the North Sea. In this study, we compare two parametrizations (Rochette et ai, 2012 and Lacroix et ai, 2013) of the stage duration (temperature dependent) derived from the same data set (mainly Fonds, 1979). We show that only small differences of the stage duration parametrization may induce significant differences of the dispersal pattern, connectivity and larval recruitment at nursery. This highlights the importance to parametrize biological processes with accuracy and the need to collect sufficient data (samples, genotypes and otoliths) and conduct experimental studies to derive biological processes parametrizations in order to improve model’s reliability.
Located in Library / RBINS Staff Publications