Publications - Angelo Coast Range Reserve

@article{Kelson2019,

title = {Do precipitation extremes drive growth and migration timing of a Pacific salmonid fish in Mediterranean‐climate streams?},

author = {Suzanne J. Kelson and Stephanie M. Carlson},

url = {https://angelo.berkeley.edu/wp-content/uploads/sites/59/ecs2.2618.pdf},

doi = {10.1002/ecs2.2618},

year  = {2019},

date = {2019-03-20},

journal = {Ecosphere},

volume = {10},

number = {3},

pages = {e02618},

abstract = {Climate change is expected to increase weather extremes and variability, including more frequent weather whiplashes or extreme swings between severe drought and extraordinarily wet years. Shifts in precipitation patterns will alter stream flow regimes, affecting critical life history stages of sensitive aquatic organisms. Understanding how threatened fish species, such as steelhead/rainbow trout (Oncorhynchus mykiss), are affected by stream flows in years with contrasting environmental conditions is important for their conservation. Here, we report how extreme wet and dry years, from 2015 to 2018, affected stream flow patterns in two tributaries to the South Fork Eel River, California, USA, and aspects of O. mykiss ecology, including over‐summer fish growth and body condition as well as spring out‐migration timing. We found that stream flow patterns differed across years in the timing and magnitude of large winter–spring flow events and in summer low‐flow levels. We were surprised to find that differences in stream flows did not impact growth, body condition, or timing of out‐migration of O. mykiss. Fish growth was limited in the late summer in these streams (average of 0.02 ± 0.05 mm/d), but was similar across dry and wet years, and so was end‐of‐summer body condition and pool‐specific biomass loss from the beginning to the end of the summer. Similarly, O. mykiss migrated out of tributaries during the last week of March/first week of April regardless of the timing of spring flow events. We suggest that the muted response to inter‐annual hydrologic variability is due to the high quality of habitat provided by these unimpaired, groundwater‐fed tributaries. Similar streams that are likely to maintain cool temperatures and sufficient base flows, even in the driest years, should be a high priority for conservation and restoration efforts.},

keywords = {Drought, ERCZO, growth, headwaters, migration, Oncorhynchus mykiss, salmonids, stream flows},

pubstate = {published},

tppubtype = {article}

}

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Power, Mary E.; Holomuzki, Joseph R.; Lowe, Rex L.

Food webs in Mediterranean rivers Journal Article

In: Hydrobiologia, vol. 719, no. 1, pp. 119-136, 2013.

Abstract | Links | BibTeX | Tags: Algal production, Cross-ecosystem fluxes, Detritus Disturbance, Drought, fate Carbon sources, Floods, Food quality, food webs, hydrology, Insect emergence, interaction strength, Mediterranean rivers, River-to-ocean fluxes, seasonality

@article{Power2013,

title = {Food webs in Mediterranean rivers},

author = {Mary E. Power and Joseph R. Holomuzki and Rex L. Lowe},

url = {https://angelo.berkeley.edu/wp-content/uploads/sites/59/Power_2013_Hydrobio.pdf},

doi = {10.1007/s10750-013-1510-0},

year  = {2013},

date = {2013-05-28},

journal = {Hydrobiologia},

volume = {719},

number = {1},

pages = {119-136},

abstract = {River food webs are subject to two regimes of longitudinally varying ecological control: productivity and disturbance. Light-limited productivity increases as channels widen downstream. Time windows for growth, however, shrink as discharge increases, substrate particle size decreases, and the frequency of flood-driven bed mobilization increases downstream. Mediterranean rivers are periodically reset by hydrologic events with somewhat predictable timing. Typically, a rainy winter with high river discharge is followed by summer drought with little or no rainfall and slowly declining river flow. The magnitude and timing of winter floods and severity of subsequent summer drought can vary considerably from year to year, however. Episodic scouring floods or prolonged periods of drought are experienced as disturbances, stressors, or opportunities by river biota. The timing, duration, and intensity of these hydrologic controls affect performances of individuals, distribution and abundances of populations, and outcomes and consequences of species interactions. These interactions in turn determine how river food webs will assemble, develop, and reconfigure after disturbance. We discuss how spatial variation in solar radiation and spatial and temporal variations in disturbance affects river food webs under Mediterranean climate seasonality, focusing primarily on long-term observations in the Eel River of northwestern California, USA},

keywords = {Algal production, Cross-ecosystem fluxes, Detritus Disturbance, Drought, fate Carbon sources, Floods, Food quality, food webs, hydrology, Insect emergence, interaction strength, Mediterranean rivers, River-to-ocean fluxes, seasonality},

pubstate = {published},

tppubtype = {article}

}

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