A. L. Hargreaves

Clay larvae do not accurately measure biogeographic patterns in predation

The paper tests if clay larvae accurately reflect geographic predation patterns and finds they fail to capture true variation, especially for invertebrate predation.

Latitudinal gradients in predation persist in urban environments

The paper tests if urbanization disrupts latitudinal gradients in seed predation across 14,000 km of latitude, finding that gradients persist despite habitat modification.

Snow Buntings, an arctic cold-specialist passerine, risk overheating under intense activity even at low air temperatures

This study shows that snow buntings, despite being cold-specialists, can overheat during intense activity even at low air temperatures, risking negative impacts on reproduction.

Mapping nationally and globally at-risk species to identify hotspots for (and gaps in) conservation

The paper maps nationally and globally at-risk species in Canada to assess spatial overlap and identifies gaps in conservation protection.

Warming in the land of the midnight sun: breeding birds may suffer greater heat stress at high- vs low-Arctic sites

This study predicts the temperature threshold for snow bunting breeding performance and finds high-Arctic sites experience more severe heat stress than low-Arctic sites due to prolonged periods of exceeding the critical temperature.

Does pollen limitation limit plant ranges? Evidence and implications

This study investigates whether pollen limitation increases toward plant range edges using global data, finding little evidence for such a trend.

Biotic interactions are more important at species' warm vs. cool range-edges: a synthesis

The paper synthesizes evidence showing biotic interactions are more influential at species' warm range edges compared to cool edges, supporting Darwin's hypothesis with a meta-analysis of 886 range limits.

Climate warming weakens local adaptation

The paper quantifies how climate change impacts population performance by analyzing temperature and precipitation effects, finding that local adaptation to temperature is critical and deviations reduce performance.

Variation in adaptation across geographic ranges is consistent with strong selection in marginal climates and legacies of range expansion

This study uses transplant data to show that populations at geographic range edges have varying adaptation levels, with poleward edges showing lower fitness and equatorial edges showing higher fitness relative to foreign populations.

Spatial distribution and hotspots of mammals in Canada

The paper examines how mammal distributions in Canada relate to conservation status and species richness, finding that range-edge species are often concentrated in areas with high overall diversity.

Seed predation increases from the Arctic to the Equator and from high to low elevations

The paper finds that post-dispersal seed predation increases from the Arctic to the Equator and from high to low elevations, driven by climate seasonality rather than productivity or biodiversity.

Local adaptation primes cold-edge populationsfor range expansion but not warming-induced range shifts

The paper tests whether cold-edge populations of Rhinanthus minor can drive range expansion or warming-induced shifts, finding adaptive phenology enhances fitness above the range but warming eliminates the edge advantage.