Use of pop-up satellite archival tag technology to study postrelease survival of and habitat use by estuarine and coastal fishes: an application to striped bass (Morone saxatilis)

Pop-up satellite archival tags (PSATs) have been used to study movements, habitat use, and postrelease survival of large pelagic vertebrates, but the size of these tags has historically precluded their use on smaller coastal species. To evaluate a new generation of smaller PSATs for the study of postrelease survival and habitat use of coastal species, we attached Microwave Telemetry, Inc., X-tags to ten striped bass (Morone saxatilis) 94–112 cm total length (TL) caught on J hooks and circle hooks during the winter recreational fishery in Virginia. Tags collected temperature and depth information every five minutes and detached from the fish after 30 days. Nine of the ten tags released on schedule and eight transmitted 30% to 96% (mean 78.6%) of the archived data. Three tags were physically recovered during or after the transmission period, allowing retrieval of all archived data. All eight striped bass whose tags transmitted data survived for 30 days after release, including two fish that were hooked deeply with J hooks. The eight fish spent more than 90% of their time at depths less than 10 m and in temperatures of 6–9°C, demonstrated no significant diel differences in depth or temperature utilization (P>0.05), and exhibited weak periodicities in vertical movements consistent with daily and tidal cycles

Amenities and the labor earnings function

I was unable to copy/paste the abstract, but the paper argues that amenities exert an important effect on wage differentials over space. Indeed, we show that as much has half of the apparent effect of unionization on wages is actually compensation for less desirable climate in locations that are most unionized.amenities; climate; weather; wage compensation; return to unionization

Incorporating inventories into supply and demand analysis

While the paper lacks a formal abstract, it draws the important distinction between stocks and flows in supply and demand to better understand the business cycle

Incorporating inventories into supply and demand analysis

While the paper lacks a formal abstract, it draws the important distinction between stocks and flows in supply and demand to better understand the business cycle.Inventories; supply and demand; business cycles; stocks versus flows

Habitat Utilization and Vertical Movements of White Marlin (Tetrapturus albidus) Released from Commercial and Recreational Fishing Gears in the Western North Atlantic Ocean: Inferences from Short Duration Pop-up Archival Satellite Tags

behavioral and oceanographic parameters to standardize historical catch-per-unit-effort time-series data. These methods have allowed researchers to account for significant changes in the depths of pelagic longline (PLL) gear deployments over time. This study presents habitat-use data recovered from high-resolution 5- and 10-day pop-up satellite archival tags (PSATs) attached to 47 surviving white marlin released from commercial and recreational fishing gears offshore of the U.S. East Coast, the northern Caribbean, and Venezuela between 2002 and 2004. Data recovered from transmitting tags indicated that white marlin spent nearly half of their time associated with warm, near-surface waters (\u3c10 m). All fish displayed frequent short duration (mean: 39.8 min) vertical excursions from surface waters to depths averaging 51 m. Qualitative and multivariate classifications of data from completely transmitted movements of surviving white marlin revealed two major types of descents: one pattern was characterized by deep ‘V’-shaped excursions of relatively short duration (mean: 23.4 min) while the other featured descents that were more broadly ‘U’-shaped and confined to a specific depth range for an extended period of time (mean: 75.8 min). Based on the frequency, persistence, and patterns of these vertical movements, white marlin appear to direct a considerable proportion of foraging effort well below surface waters, a behavior that may account for relatively high catch rates of white marlin on some deep-set PLL deployments

Low Cost Magnetometer Calibration and Distributed Simultaneous Multipoint Ionospheric Measurements from a Sounding Rocket Platform

Low cost and low size-weight-and-power magnetometers can provide greater accessibility for distributed simultaneous measurements in the ionosphere, either onboard sounding rockets or on CubeSats. The Space and Atmospheric Instrumentation Laboratory at Embry-Riddle Aeronautical University launched a midlatitude sounding rocket named SpEED Demon from Wallops Flight Facility in August 2022. SpEED Demon has a comprehensive suite of instruments for electrodynamics and neutral dynamics measurements. Among this suite is one high performance Billingsley magnetometer (TFM65VQS) and six commercial-off-the-shelf magnetometers manufactured by the PNI Corporation (RM3100). Of the six, two PNI magnetometers are situated on a deployable boom on the main payload that also carries the Billingsley magnetometer. The remaining four PNI magnetometers are distributed among four ejectable subpayloads. These low-cost and low SWaP magnetometers can achieve a resolution of approximately 1.5 nT and a precision of +/- 4 nT (one sigma) at 15 Hz in a uniform magnetic field. This performance is sufficient for detecting and measuring field aligned currents as well as a variety of other geomagnetic disturbances. The magnetometers are calibrated against an independently calibrated flux-gate magnetometer inside a Helmholtz cage. Zero field offsets are quantified inside a triple-layer mu-metal zero gauss chamber. This work will present the calibration process, the calibration results, and the flight performance of these sensors from the SpEED Demon sounding rocket launch

The short-and long-run marginal cost curve: a pedagogical note

The brief paper lacks an abstract, but clarifies a point of considerable confusion among students of economics

Amenities and the labor earnings function

I was unable to copy/paste the abstract, but the paper argues that amenities exert an important effect on wage differentials over space. Indeed, we show that as much has half of the apparent effect of unionization on wages is actually compensation for less desirable climate in locations that are most unionized

The short-and long-run marginal cost curve: a pedagogical note

The brief paper lacks an abstract, but clarifies a point of considerable confusion among students of economics