Jorge Negrín Dastis

Fisheries and Oceans Canada | DFO

Context A variety of metrics can be used to measure connectivity of protected areas. Assumptions about animal movement and mortality vary among metrics. There is a need to better understand what to use and why, and how much conclusions depend on the choice of metric. Objectives We compare selected raster-based moving-window metrics for assessing t...

Ecosystems are connected by flows of nutrients and organisms. Changes to connectivity and nutrient enrichment may destabilise ecosystem dynamics far from the nutrient source. We used gradostats to examine the effects of trophic connectivity (movement of consumers and producers) versus nutrient-only connectivity in different metaecosystem configurat...

Context A variety of metrics can be used to measure connectivity of protected areas. Assumptions about animal movement and mortality vary among metrics. There is a need to better understand what to use and why, and how much conclusions depend on the choice of metric. Objectives We compare selected raster-based moving-window metrics for assessing t...

Ecosystem processes vary temporally due to environmental fluctuations, such as when variation in solar energy causes diurnal cycles in primary production. This normal variation in ecosystem functioning may be disrupted and even lost if taxa contributing to functioning go extinct due to environmental stress. However, when communities are exposed to...

Ecosystem processes vary temporally due to environmental fluctuations, such as when variation in solar energy causes diurnal cycles in primary production. This normal variation in ecosystem functioning may be disrupted and even lost by novel stress if taxa contributing to functioning go extinct. However, when communities are exposed to the stress a...

Ecosystem processes vary temporally due to variation in environmental variables, such as when diurnal variation in sunlight causes diurnal cycles in net primary production. This variability can be characterized by its frequency and amplitude, used to define “normal” functioning of an ecosystem. Relatively little research has addressed how normal mo...

In freshwater environments, extreme heatwave events can modulate producer-consumer (a)synchrony and plankton phenology, but they can also reduce primary production and promote the occurrence of algal blooms. We used data on the dynamics of a natural phytoplankton and zooplankton community sampled during two whole-pond mesocosm experiments (2017 and...

Evolutionary approaches are gaining popularity in conservation science, with diverse strategies applied in efforts to support adaptive population outcomes. Yet conservation strategies differ in the type of adaptive outcomes they promote as conservation goals. For instance, strategies based on genetic or demographic rescue implicitly target adaptive...

Maladaptation is widespread in natural populations. However, maladaptation has most often been associated with absolute population decline in local habitats rather than on a spectrum of relative fitness variation that can assist natural populations in their persistence at larger regional scales. We report results from a field experiment that tested...

Abiotic variables can significantly alter ecosystem processes as well as act as selective agents of evolutionary diversification across landscape gradients. However how abiotic variables can affect phenotypic variation for adaptive or maladaptive traits across landscapes with differing levels of spatial and temporal heterogeneity is largely unexplo...

We applied essential fatty acids as a biomarker to experimentally test the effects of a fish-mediated trophic cascade on calanoid copepod nutritional state and functional traits in north-temperate freshwater ponds. A whole-pond experiment was conducted where young-of-the-year brook trout (Salvelinus fontinalis) were introduced into three natural, f...

Evolutionarily-informed approaches in conservation typically focus on fostering adaptive responses to human modified environments. Goals guiding such approaches are generally aimed either at maintaining optimal traits (i.e. conservation for an adaptive state) or increasing adaptive potential (i.e. conservation for an adaptive process). When viewed...

Theoretical work has shown that spatial landscape context can contribute to reducing local adaptation in populations depending on the spatial pattern of environmental heterogeneity, the spatial scale of distances between habitats on landscapes, and the level of habitat connectivity. However, only a handful of empirical studies have addressed the im...

Expert Workshop on addressing biodiversity concerns in sustainable Fisheries. Bergen, Norway, 7-9-December 2011