2020
Kelson, Suzanne J.; Miller, Michael R.; Thompson, Tasha Q.; O’Rourke, Sean M.; Carlson, Stephanie M.
Temporal dynamics of migration‐linked genetic variation are driven by streamflows and riverscape permeability Journal Article
In: Molecular Ecology, vol. 29, no. 5, pp. 870-885, 2020.
Abstract | Links | BibTeX | Tags: ecology, ERCZO, genetic variation, landscape genetics, life history, O. mykiss, Oncorhynchus mykiss, partial barrier, partial migration, river networks
@article{Kelson2020,
title = {Temporal dynamics of migration‐linked genetic variation are driven by streamflows and riverscape permeability},
author = {Suzanne J. Kelson and Michael R. Miller and Tasha Q. Thompson and Sean M. O'Rourke and Stephanie M. Carlson},
url = {https://angelo.berkeley.edu/wp-content/uploads/sites/59/mec.15367-1.pdf},
doi = {10.1111/mec.15367},
year = {2020},
date = {2020-02-03},
journal = {Molecular Ecology},
volume = {29},
number = {5},
pages = {870-885},
abstract = {Landscape permeability is often explored spatially, but may also vary temporally. Landscape permeability, including partial barriers, influences migratory animals that move across the landscape. Partial barriers are common in rivers where barrier passage varies with streamflow. We explore the influence of partial barriers on the spatial and temporal distribution of migration‐linked genotypes of Oncorhynchus mykiss, a salmonid fish with co‐occurring resident and migratory forms, in tributaries to the South Fork Eel River, California, USA, Elder and Fox Creeks. We genotyped >4,000 individuals using RAD‐capture and classified individuals as resident, heterozygous or migratory genotypes using life history‐associated loci. Across four years of study (2014–2017), the permeability of partial barriers varied across dry and wet years. In Elder Creek, the largest waterfall was passable for adults migrating up‐river 4–39 days each year. In this stream, the overall spatial pattern, with fewer migratory genotypes above the waterfall, remained true across dry and wet years (67%–76% of migratory alleles were downstream of the waterfall). We also observed a strong relationship between distance upstream and proportion of migratory alleles. In Fox Creek, the primary barrier is at the mouth, and we found that the migratory allele frequency varied with the annual timing of high flow events. In years when rain events occurred during the peak breeding season, migratory allele frequency was high (60%–68%), but otherwise it was low (30% in two years). We highlight that partial barriers and landscape permeability can be temporally dynamic, and this effect can be observed through changing genotype frequencies in migratory animals.},
keywords = {ecology, ERCZO, genetic variation, landscape genetics, life history, O. mykiss, Oncorhynchus mykiss, partial barrier, partial migration, river networks},
pubstate = {published},
tppubtype = {article}
}
Landscape permeability is often explored spatially, but may also vary temporally. Landscape permeability, including partial barriers, influences migratory animals that move across the landscape. Partial barriers are common in rivers where barrier passage varies with streamflow. We explore the influence of partial barriers on the spatial and temporal distribution of migration‐linked genotypes of Oncorhynchus mykiss, a salmonid fish with co‐occurring resident and migratory forms, in tributaries to the South Fork Eel River, California, USA, Elder and Fox Creeks. We genotyped >4,000 individuals using RAD‐capture and classified individuals as resident, heterozygous or migratory genotypes using life history‐associated loci. Across four years of study (2014–2017), the permeability of partial barriers varied across dry and wet years. In Elder Creek, the largest waterfall was passable for adults migrating up‐river 4–39 days each year. In this stream, the overall spatial pattern, with fewer migratory genotypes above the waterfall, remained true across dry and wet years (67%–76% of migratory alleles were downstream of the waterfall). We also observed a strong relationship between distance upstream and proportion of migratory alleles. In Fox Creek, the primary barrier is at the mouth, and we found that the migratory allele frequency varied with the annual timing of high flow events. In years when rain events occurred during the peak breeding season, migratory allele frequency was high (60%–68%), but otherwise it was low (30% in two years). We highlight that partial barriers and landscape permeability can be temporally dynamic, and this effect can be observed through changing genotype frequencies in migratory animals.
2002
Power, Mary E.; Dietrich, William E.
Food webs in river networks Journal Article
In: Ecological Research, vol. 17, no. 4, pp. 451-471, 2002.
Abstract | Links | BibTeX | Tags: food chain length, food webs, landscape heterogeneity, river networks, stream ecosystems
@article{Power2002,
title = {Food webs in river networks},
author = {Mary E. Power and William E. Dietrich},
url = {https://angelo.berkeley.edu/wp-content/uploads/sites/59/Power_et_al-2002-Ecological_Research1.pdf},
doi = {10.1046/j.1440-1703.2002.00503.x},
year = {2002},
date = {2002-06-28},
journal = {Ecological Research},
volume = {17},
number = {4},
pages = {451-471},
abstract = {Food webs and river drainages are both hierarchical networks and complex adaptive systems. How does living within the second affect the first? Longitudinal gradients in productivity, disturbance regimes and habitat structure down rivers have long interested ecologists, but their effects on food web structure and dynamics are just beginning to be explored. Even less is known about how network structure per se influences river and riparian food webs and their members. We offer some preliminary observations and hypotheses about these interactions, emphasizing observations on upstream–downstream changes in food web structure and controls, and introducing some ideas and predictions about the unexplored question of food web responses to some of the network properties of river drainages.},
keywords = {food chain length, food webs, landscape heterogeneity, river networks, stream ecosystems},
pubstate = {published},
tppubtype = {article}
}
Food webs and river drainages are both hierarchical networks and complex adaptive systems. How does living within the second affect the first? Longitudinal gradients in productivity, disturbance regimes and habitat structure down rivers have long interested ecologists, but their effects on food web structure and dynamics are just beginning to be explored. Even less is known about how network structure per se influences river and riparian food webs and their members. We offer some preliminary observations and hypotheses about these interactions, emphasizing observations on upstream–downstream changes in food web structure and controls, and introducing some ideas and predictions about the unexplored question of food web responses to some of the network properties of river drainages.