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ABSTRACT Headwater forests serve many ecological functions and may be particularly responsive to changes in climate and land use. Riparian birds can serve as indicators of changes in their associated ecosystems. Little known, however, are... more
ABSTRACT Headwater forests serve many ecological functions and may be particularly responsive to changes in climate and land use. Riparian birds can serve as indicators of changes in their associated ecosystems. Little known, however, are combined influences of climate and land use on riparian birds and riparian ecosystems. We examined multiscale associations between these environmental conditions and reproduction of the Louisiana Waterthrush (Seiurus motacilla), a riparian-obligate songbird that breeds in the eastern United States. Specifically, we measured variables at multiple spatial and temporal scales to model crucial components of individual fecundity, using an information-theoretic approach. We monitored 190 nests in 139 territories within 13 drainages from 2002 to 2005. Daily nest survival reached a maximum when mean rainfall was intermediate (3–10 mm day–1) during the nesting period. Nestling survival, by contrast, reached its maximum with high amounts of rainfall (>14 ...
Louisiana Waterthrushes (waterthrushes; Seiurus motacilla) are infrequently studied Neotropical migratory songbirds that breed throughout much of the southeastern U.S, which is undergoing rapid urbanization. They may serve as effective... more
Louisiana Waterthrushes (waterthrushes; Seiurus motacilla) are infrequently studied Neotropical migratory songbirds that breed throughout much of the southeastern U.S, which is undergoing rapid urbanization. They may serve as effective indicators of stream biotic integrity because of their dependence on riparian systems for food and nesting. Furthermore, waterthrushes are easier to survey than complex assemblages of fish and macroinvertebrates. While the
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ABSTRACT
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ABSTRACT Migratory species provide economically beneficial ecosystem services to people throughout their range, yet often, information is lacking about the magnitude and spatial distribution of these benefits at regional scales. We... more
ABSTRACT Migratory species provide economically beneficial ecosystem services to people throughout their range, yet often, information is lacking about the magnitude and spatial distribution of these benefits at regional scales. We conducted a case study for Northern Pintails (hereafter pintail) in which we quantified regional and sub-regional economic values of subsistence harvest to indigenous communities in Arctic and sub-Arctic North America. As a first step, we used the replacement cost method to quantify the cost of replacing pintail subsistence harvest with the most similar commercially available protein (chicken). For an estimated annual subsistence harvest of ˜15,000 pintail, our mean estimate of the total replacement cost was ˜$63,000 yr−1 ($2010 USD), with sub-regional values ranging from $263 yr−1 to $21,930 yr−1. Our results provide an order-of-magnitude, conservative estimate of one component of the regional ecosystem-service values of pintails, providing perspective on how spatially explicit values can inform migratory species conservation.
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Six large-bodied, ≥ 120 g, woodpecker species are listed as near-threatened to critically endangered by the International Union for Conservation of Nature (IUCN). The small population paradigm assumes that these populations are likely to... more
Six large-bodied, ≥ 120 g, woodpecker species are listed as near-threatened to critically endangered by the International Union for Conservation of Nature (IUCN). The small population paradigm assumes that these populations are likely to become extinct without an increase in numbers, but the combined influences of initial population size and demographic rates, i.e., annual adult survival and fecundity, may drive
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Research Interests: Microbiology, Microbial Ecology, Ecology, Rivers, Georgia, and 15 moreHumans, Escherichia coli, Campylobacter, Animals, Cluster Analysis, Species identification, Antimicrobial resistance, Salmonella, River Basin, Anti-Bacterial Agents, Enterococcus, Microbial Sensitivity Tests, Total Coliform, Spatial Relationships, and Microbial community
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Research Interests: Partial Differential Equations, Academic Librarianship, Natural History, Evolutionary Ecology, Multidisciplinary, and 9 moreEcological Modelling, Seasonality, Conceptual Framework, Reproductive Success, Ecological, PARTIAL DIFFERENTIAL EQUATION, Markov chain, Population dynamic, and Individual Based Model
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... 1997); and (v) <35 km from Rice Lake National Wildlife Refuge (NWR) headquarters in Aitkin County, Minnesota to ensure logistical efficiency. ... the above criteria, we randomly selected six (mean = 70.0 years since... more
... 1997); and (v) <35 km from Rice Lake National Wildlife Refuge (NWR) headquarters in Aitkin County, Minnesota to ensure logistical efficiency. ... the above criteria, we randomly selected six (mean = 70.0 years since clear-cutting, range: 5791 years) (Mattsson and Niemi 2006). ...
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... levels of nest-predation by mammals or birds that concentrate in areas perforated by silviculture (Fenske-Crawford and Niemi 1997, Samson ... 1997); and (5) <35 km from Rice Lake National Wildlife Refuge (NWR)... more
... levels of nest-predation by mammals or birds that concentrate in areas perforated by silviculture (Fenske-Crawford and Niemi 1997, Samson ... 1997); and (5) <35 km from Rice Lake National Wildlife Refuge (NWR) headquarters in Aitkin County, Minnesota, to ensure logistical ...
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... nesting in riparian forests respond differently to altered patch and landscape conditions than ... dependence must also be taken into account when evaluating external influences on reproduction ... the territory and less time to... more
... nesting in riparian forests respond differently to altered patch and landscape conditions than ... dependence must also be taken into account when evaluating external influences on reproduction ... the territory and less time to reproduction after exceeding an optimal level of territory ...
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'^^ The Auk 124(4):1186-1200, 2007 {Jk ? The American Ornithologists' Union, 2007. W\_ Printed in USA. ... WHICH LIFE-HISTORY COMPONENTS DETERMINE BREEDING PRODUCTIVITY FOR INDIVIDUAL SONGBIRDS? A CASE... more
'^^ The Auk 124(4):1186-1200, 2007 {Jk ? The American Ornithologists' Union, 2007. W\_ Printed in USA. ... WHICH LIFE-HISTORY COMPONENTS DETERMINE BREEDING PRODUCTIVITY FOR INDIVIDUAL SONGBIRDS? A CASE STUDY OF THE LOUISIANA WATERTHRUSH ( ...