Browsing Scheibling, Robert E. by Issue Date
Now showing items 1-20 of 38
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Fatty acids as dietary tracers in benthic food webs
Fatty acid (FA) analysis is a well-established tool for studying trophic interactions in marine habitats. However, its application to benthic food webs poses 2 particular challenges. First, unlike pelagic zooplankton, ... -
Detrital production in Nova Scotian kelp beds: patterns and processes
Connectivity via the transport of detrital material from areas of high to low productivity may be an important determinant of secondary productivity and biodiversity in receiving communities. On the Atlantic coast of ... -
Invasion-mediated shifts in the macrobenthic assemblage of a rocky subtidal ecosystem
We tracked changes in community composition that occurred with state shifts in the rocky subtidal ecosystem in Nova Scotia, Canada, from 1992 to 2008. At the beginning of our study, a dense aggregation of sea urchins was ... -
Killer storms: North Atlantic hurricanes and disease outbreaks in sea urchins
An increase in the incidence of disease in various marine organisms over the past few decades has been linked to ocean climate change. In Nova Scotia, Canada, mass mortalities of sea urchins, due to an amoebic disease, ... -
Disease outbreaks associated with recent hurricanes cause mass mortality of sea urchins in Nova Scotia
Field observations and laboratory experiments support the hypothesis that disease-induced mass mortality of the sea urchin Strongylocentrotus droebachiensis can be associated with hurricane events that introduce a ... -
Spatial and temporal variation in DMSP content in the invasive seaweed Codium fragile ssp fragile: effects of temperature, light and grazing
The methionine-derived secondary metabolite dimethylsulfoniopropionate (DMSP) is believed to function in cryoprotection, defense against herbivory, and reduction of oxidative stress in some seaweeds. The ability to produce ... -
Spatial dynamics, ecological thresholds and phase shifts: modelling grazer aggregation and gap formation in kelp beds
On the Atlantic coast of Nova Scotia, transitions between alternative states of the subtidal ecosystem, kelp beds and sea urchin barrens, occur on a decadal scale. To explore the process of urchin aggregation within kelp ... -
Temperature-mediated outbreak dynamics of the invasive bryozoan Membranipora membranacea in Nova Scotian kelp beds
We used underwater videography to examine seasonal and interannual patterns in the cover (on kelp) of the encrusting epiphytic bryozoan Membranipora membranacea, and associated changes in the structure and abundance of ... -
Herbivory and community organization on a subtidal cobble bed
We examined the role of molluscan mesograzers (periwinkles Littorina littorea, limpets Testudinalia testudinalis and chitons Ischnochiton ruber) in mediating macroalgal succession after a mass mortality of sea urchins ... -
Fatty acids tracers for native and invasive macroalgae in an experimental food web
We assessed the potential of fatty acid (FA) markers for tracing primary production from an invasive green alga (Codium fragile ssp. fragile) and a native kelp (Saccharina longicruris) through 2 trophic levels in an ... -
Modelling phase shifts in a rocky subtidal ecosystem
The rocky subtidal ecosystem of the Atlantic coast of Nova Scotia is characterised by 2 community states, kelp beds and urchin barrens that alternate on a decadal time scale. While the shift from barrens to a kelp bed ... -
Fecal production by sea urchins in native and invaded algal beds
To examine the role of fecal production by the sea urchin Strongylocentrotus droobachiensis in native and invaded algal assemblages in Nova Scotia, Canada, we examined the quantity (production rate by urchin feeding ... -
Modelling phase shifts in a rocky subtidal ecosystem
The rocky subtidal ecosystem of the Atlantic coast of Nova Scotia is characterised by 2 community states, kelp beds and urchin barrens that alternate on a decadal time scale. While the shift from barrens to a kelp bed ... -
Fatty acid profiles in the gonads of the sea urchin Strongylocentrotus droebachiensis on natural algal diets
We examined fatty acid (FA) compositions of gonads of the green sea urchin Strongylocentrotus droebachiensis collected from a grazing aggregation (front) at the edge of a kelp bed and from barrens dominated by coralline ... -
Behaviour of sea urchin Strongylocentrotus droebachiensis grazing fronts: food-mediated aggregation and density-dependent facilitation
The occurrence of destructive grazing fronts is a common phenomenon in sea urchins, but mechanisms governing front formation and dynamics remain poorly understood. We experimentally examined the effect of kelp biomass ... -
Competitive interactions between the invasive green alga Codium fragile ssp tomentosoides and native canopy-forming seaweeds in Nova Scotia (Canada)
Two concurrent 2 yr experiments were conducted along the Atlantic coast of Nova Scotia (1) to examine competitive interactions between the invasive green alga Codium fragile ssp. tomentosoides and canopy-forming native ... -
Role of grazing by sea urchins Strongylocentrotus droebachiensis in regulating the invasive alga Codium fragile ssp tomentosoides in Nova Scotia
To assess the potential of herbivory in regulating the invasive green alga Codium fragile ssp. tomentosoides, field and laboratory experiments were conducted with the green sea urchin Strongylocentrotus droebachiensis ... -
Estimating fertilization success in marine benthic invertebrates: A case study with the tropical sea star Oreaster reticulatus
Several factors can influence fertilization success, and for marine broadcast spawners, the main constraint is rapid dilution of gametes. Because the measurement of fertilization success in the field is logistically ... -
Predicting wave dislodgment of mussels: variation in attachment strength with body size, habitat, and season
Breaking waves impose large hydrodynamic forces which may dislodge mussels and other organisms living on exposed rocky shores. We examined the effect of variation in attachment strength with size, habitat and season on ... -
Variation in egg spawning among subpopulations of sea urchins Strongylocentrotus droebachiensis: a theoretical approach
Variation in zygote production, by determining the initial size of the larvalpool, can aff ect the population dynamics of marine invertebrates with a planktonic larval stage. In this paper, we model temporal and spatial ...
