Robert J. Rolls
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View article: Navigating the spatial and temporal aspects of beta diversity to facilitate understanding biodiversity change
Navigating the spatial and temporal aspects of beta diversity to facilitate understanding biodiversity change Open
Beta diversity is often assessed at different spatial and temporal scales and, consequently, has been defined in multiple ways. Here, we define four unique aspects of beta diversity that encompass the diverse applications of this concept i…
View article: Unravelling large-scale patterns and drivers of biodiversity in dry rivers
Unravelling large-scale patterns and drivers of biodiversity in dry rivers Open
The lack of data from non-perennial rivers, which regularly cease to flow and dry up, poses a significant challenge in understanding river biodiversity. These dynamic ecosystems, accounting for over half of the global river network, remain…
View article: Scale dependency in fish beta diversity–hydrology linkages in lowland rivers
Scale dependency in fish beta diversity–hydrology linkages in lowland rivers Open
Aim A key aspect of biodiversity research is to determine the environmental drivers affecting the degree to which ecological assemblages vary in space (beta diversity). The strength and significance of environmental drivers of beta diversi…
View article: Biotic homogenisation and differentiation as directional change in beta diversity: synthesising driver–response relationships to develop conceptual models across ecosystems
Biotic homogenisation and differentiation as directional change in beta diversity: synthesising driver–response relationships to develop conceptual models across ecosystems Open
Biotic homogenisation is defined as decreasing dissimilarity among ecological assemblages sampled within a given spatial area over time. Biotic differentiation, in turn, is defined as increasing dissimilarity over time. Overall, changes in…
View article: How Shall We Meet? Embracing the Opportunities of Virtual Conferencing
How Shall We Meet? Embracing the Opportunities of Virtual Conferencing Open
The SARS-CoV-2 (COVID-19) pandemic triggered dramatic shifts in the way that ecologists teach, research, and interact (e.g., Cooke et al. 2021). As the world now adjusts to a “new normal” era, there is notable and open discussion about the…
View article: Benefits of permanent adoption of virtual conferences for conservation science
Benefits of permanent adoption of virtual conferences for conservation science Open
Disruptive events can trigger societal transformations with beneficial outcomes (Walker et al., 2020). For scientific professions, the COVID-19 pandemic triggered a comprehensive shift from in-person workshops, seminars, and conferences to…
View article: Sediment Respiration Pulses in Intermittent Rivers and Ephemeral Streams
Sediment Respiration Pulses in Intermittent Rivers and Ephemeral Streams Open
Intermittent rivers and ephemeral streams (IRES) may represent over half the global stream network, but their contribution to respiration and carbon dioxide (CO 2 ) emissions is largely undetermined. In particular, little is known about th…
View article: Drought alters the functional stability of stream invertebrate communities through time
Drought alters the functional stability of stream invertebrate communities through time Open
Aim In fresh waters, most biogeographical understanding of how extreme events such as drought modify biodiversity and ecosystem functioning derives from static, spatial comparisons of ecological communities, between intact and disturbed si…
View article: Simulating rewetting events in intermittent rivers and ephemeral streams: A global analysis of leached nutrients and organic matter
Simulating rewetting events in intermittent rivers and ephemeral streams: A global analysis of leached nutrients and organic matter Open
Climate change and human pressures are changing the global distribution and the extent of intermittent rivers and ephemeral streams (IRES), which comprise half of the global river network area. IRES are characterized by periods of flow ces…
View article: Conceptualising the interactive effects of climate change and biological invasions on subarctic freshwater fish
Conceptualising the interactive effects of climate change and biological invasions on subarctic freshwater fish Open
Climate change and species invasions represent key threats to global biodiversity. Subarctic freshwaters are sentinels for understanding both stressors because the effects of climate change are disproportionately strong at high latitudes a…
View article: Climate and productivity shape fish and invertebrate community structure in subarctic lakes
Climate and productivity shape fish and invertebrate community structure in subarctic lakes Open
Summary Climate change and land‐use intensification are increasing productivity in subarctic lakes. Simultaneously, fish and invertebrate species adapted to temperate conditions are expanding their range northwards into subarctic habitats.…