Publications

@article{Rose2023,

title = {Identifying drivers of population dynamics for a stream breeding amphibian using time series of egg mass counts},

author = {JP Rose and SJ Kupferberg and RA Peek and D Ashton and JB Bettaso and S Bobzien and RM Bourque and KGH Breedveld and A Catenazzi and JE Drennan and E Gonsolin and M Grefsrud and AE Herman and MR House and MR Kluber and AJ Lind and KR Marlow and A Striegle and M Hattem and CA Wheeler and JT Wilcox and KD Wiseman and BJ Halstead},

editor = {AM Kramer},

url = {https://angelo.berkeley.edu/wp-content/uploads/sites/59/Ecosphere-2023-Rose.pdf},

doi = {10.1002/ecs2.4645},

year  = {2023},

date = {2023-08-24},

urldate = {2023-08-24},

journal = {Ecosphere},

volume = {14},

issue = {8},

pages = {e4645},

abstract = {The decline in amphibian populations is one of the starkest examples of the biodiversity crisis. For stream breeding amphibians, alterations to natural flow regimes by dams, water diversions, and climate change have been implicated in declines and extirpations. Identifying drivers of amphibian declines requires long time series of abundance data because amphibian populations can exhibit high natural variability. Multiple population viability analysis (MPVA) models integrate abundance data and share information from different populations to estimate how environmental factors influence population growth. Flow alteration has been linked to declines and extirpations in the Foothill Yellow-legged Frog (Rana boylii), a stream breeding amphibian native to California and Oregon. To date, no study has jointly analyzed abundance data from populations throughout the range of R. boylii in an MPVA model. We compiled time series of egg mass counts (an index of adult female abundance) from R. boylii populations in 36 focal streams and fit an MPVA model to quantify how streamflow metrics, stream temperature, and surrounding land cover affect population growth. We found population growth was positively related to stream temperature and was higher in the years following a wet year with high total annual streamflow. Density dependence was weakest (i.e., carrying capacity was highest) for streams with high seasonality of streamflow and intermediate rates of change in streamflow during spring. Our results highlight how altered streamflow can further increase the risk of decline for R. boylii populations. Managing stream conditions to better match natural flow and thermal regimes would benefit the conservation of R. boylii populations.},

keywords = {amphibian declines, amphibian populations, amphibians, Foothill yellow‐legged frog, population structure, stream ecosystems},

pubstate = {published},

tppubtype = {article}

}

@article{Bouma-Gregson2021b,

title = {Microcoleus (Cyanobacteria) form watershed-wide populations without strong gradients in population structure},

author = {K Bouma-Gregson and A Crits-Christoph and MR Olm and ME Power and JF Banfield},

url = {https://angelo.berkeley.edu/bouma-gregson_microcoleus_cyanobacteria_populations-2/},

doi = {https://doi.org/10.1111/mec.16208},

year  = {2021},

date = {2021-10-04},

urldate = {2021-10-04},

journal = {Molecular Ecology},

volume = {31},

pages = {86-103},

keywords = {cyanobacteria, ERCZO, population ecology, population structure},

pubstate = {published},

tppubtype = {article}

}

@article{Munshaw2014,

title = {Correlates and consequences of injury in a large, predatory stream salamander (Dicamptodon tenebrosus)},

author = {Robin G. Munshaw and W. I. Atlas and W. J. Palen and Danielle M. Courcelles and Zachary L. Monteith},

url = {https://angelo.berkeley.edu/wp-content/uploads/sites/59/Munshaw_2014_AmphRept.pdf},

issn = {0173-5373},

year  = {2014},

date = {2014-01-01},

journal = {Amphibia-Reptilia},

volume = {35},

number = {1},

pages = {107-116},

abstract = {Conspecific aggression is an important factor structuring population dynamics through intra- and interspecific interactions, but is rarely studied in un-manipulated populations. In this study, we evaluated rates of injury as a proxy for conspecific aggression using a depletion survey of predatory coastal giant salamanders (Dicamptodon tenebrosus) in a tributary of the South Fork Eel River, California. We tested a range of hypotheses including a suite of environmental and biotic factors for the rate of injury in a population by using an AIC model-selection approach that examined the weight of evidence for individual models. We examined both the probability of a given individual being injured, and the proportion of individuals within a given study pool being injured. We found strong support for models including salamander size, density of young-of-the-year steelhead, and density of the largest size-class of salamander as factors positively influencing the rate of injury at both the individual and habitat levels. We also found that density of older steelhead (1+ steelhead) had a strong, but highly variable positive impact on frequency of injury. This study shows that both conspecific and heterospecific factors influence intraspecific aggression for the dominant salamander throughout coastal Pacific Northwest streams. Our methodology demonstrates a non-manipulative approach to identifying correlates of natural injury in a cryptic species of amphibian. More work is needed to determine how these factors directly and indirectly influence the spatial distribution, individual fitness, and dynamics of salamander populations within streams.},

keywords = {aggression, Dicamptodon tenebrosus, population structure, resource competition, territorialism},

pubstate = {published},

tppubtype = {article}

}