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Free-living species exhibit seasonal variation in various life history traits, including vital rates such as birth and death patterns. Different physiological mechanisms are thought to underlie the expression of life history traits that contribute to lifetime fitness. However, although the broad...
The San Francisco Estuary (SFE) is one of the most degraded ecosystems in the United States, and organisms that inhabit it are exposed to a suite of environmental stressors. The delta smelt (Hypomesus transpacificus), a small semi-anadromous fish endemic to the SFE and considered an indicator...
Cortisol, the primary glucocorticoid in fishes, is secreted into the bloodstream in response to stress. Circulating cortisol accumulates in scales, a durable calcified structure that can be easily sampled from many fish species. As such, the use of scale cortisol concentration (SCC) is currently...
High-latitude lizards are capable of activity at low winter temperatures and are active on warm nights (including in winter) with prior warmer temperatures during the day, with active field body temperature as low as 1.4#x00B0;C and air temperature less than 1#x00B0;C.
White sturgeon (Acipenser transmontanus) may be acclimated to different salinities in the Fraser River, which may impact their ability to recover from severe exercise induced by angling. Sturgeon acclimated to different salinities and subjected to stimulated angling stress showed differences in...
Hipposideros pratti called at higher intensities while keeping the constant frequencies of their echolocation pulses consistent under spectrally non-overlapping background noise conditions. The noise could decrease auditory sensitivity and sharp intensity tuning, suggesting an acoustic masking...
This study investigated how the deployment of juvenile Chinook salmon in ambient river conditions and the subsequent exposure to and infection by pathogens was associated with the changes in the expression of genes involved in immune system functioning, general stress and host development....
We measured the hypoxia tolerance and metabolic rate of the threatened eastern sand darter across multiple seasons in a field setting and demonstrated that temperature is a weak predictor of metabolic rate and hypoxia tolerance of this species.
Animal diversity is reflected not only in species numbers but can also include variability in size and fecundity, which the organism's environment can shape. Using a description of individual metabolism, we show how seasonal food availability can explain diversity in body size and reproduction.
Cochlospermum fraseri (‘Kapok’, Bixaceae) is a deciduous tree widely distributed throughout semi-arid and monsoon tropical northern Australia, and an important species for ecological restoration in the region. We aimed to better understand the seed biology and ecology of C. fraseri to determine...
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