Galen Holt

Galen Holt
The University of Arizona | UA · Department of Ecology and Evolutionary Biology

PhD

About

10
Publications
589
Reads
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101
Citations

Publications

Publications (10)
Article
Stream systems are characterized by a hierarchical dendritic branching pattern, which is thought to have important consequences for stream community structure. However, branching is associated with many other changes in stream condition, which make disentangling the effects of branching from associated environmental changes challenging. Moreover, m...
Article
The maintenance of species diversity occurs at the regional scale but depends on interacting processes at the full range of lower scales. Although there is a long history of study of regional diversity as an emergent property, analyses of fully multiscale dynamics are rare. Here, we use scale transition theory for a quantitative analysis of multisc...
Conference Paper
Background/Question/Methods Stream systems are characterized by a branched network structure. The branching itself is widely thought to be a significant driver of distinctive patterns of abundance and diversity. These patterns are likely to be modified by complex environmental variation and dispersal characteristics. The resulting mosaic of varyi...
Conference Paper
Background/Question/Methods Environmental variation has a strong potential to promote coexistence, but different types of variation have differing properties. In any natural system, the total environmental variation has three components: a fixed spatial pattern, such as pools and riffles along a stream; temporal fluctuations that affect all sites...
Conference Paper
Background/Question/Methods Stream systems exhibit environmental heterogeneity at multiple scales, from large-scale trends in temperature and discharge to very small scale variation in microhabitats within pools or riffles. In addition, streams have a dendritic branching pattern that has clear effects on the dispersal of aquatic species. These cha...
Conference Paper
Background/Question/Methods Species-specific responses to a variable environment can promote coexistence by the storage effect, relative nonlinearity, and the fitness-density covariance. These mechanisms depend on how the species respond to the environment rather than a direct measurement of the physical environment itself. Therefore, the way org...
Article
In sexual conflict, aggressive males frequently diminish the long-term reproductive success of females in efforts to gain a short-term advantage over rival males. This short-term advantage can selectively favour high-exploitation males. However, just as the over-exploitation of resources can lead to local extinction, the over-exploitation of female...
Conference Paper
Background/Question/Methods Streams are a unique environment to study population dynamics. Compared to most other types of spatial structure, they have a preferred direction of dispersal. For many species, movement is restricted to the stream itself, limiting dispersal to a single dimension. Permanent spatial variation is inherently found in stream...
Article
Abstract –  The salmonid Oncorhynchus mykiss tends to inhabit forested or snow-fed streams having cold reliable flows, but in the California chaparral they inhabit rain-fed stream networks with extensive areas of intermittent flow. We hypothesised that hydrological mechanisms in such watersheds tend to spatially segregate spawning and over-summerin...

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