Pelagic Longline Fishing Gear: A Brief History and Review of Research Efforts to Improve Selectivity

Pelagic longline gear had several independent evolutions, but the most widespread form appears to have been originally developed by the Japanese as early as the mid-19th century. Technological developments such as polyamide monofilament line and modern fishing vessel construction have resulted in the evolution and expansion of this gear type as the primary worldwide method of commercially harvesting large pelagic fishes such as broadbill swordfish and tunas.Although the adaptability of the gear through changes in materials, lengths, and deployment strategies has resulted in generally high selectivity for many target species, the bycatch of protected species by pelagic longlines is considered a global problem in the conservation effort to sustain populations of sea turtles, sea birds, and some istiophorid billfishes (sailfishes; spearfishes; marlins). Recent research on the modification of pelagic longline fishing strategies uses this inherent adaptability of the gear to avoid or reduce the mortality of bycatch species. This is an alternative to the traditional management strategy of closed areas, which fishermen view as less effective and generally more restrictive (limiting) with respect to target catches. This work with academic partners and commercial fishermen has resulted in the development of bycatch reduction strategies which include safe handling and release gear and protocols, use of circle hooks in place of traditional J-style hooks, restrictions on gangion and mainline lengths, and corrodible hooks

Evidence Of Shark Predation And Scavenging On Fishes Equipped With Pop-Up Satellite Archival Tags

Over the past few years, pop-up satellite archival tags (PSATs) have been used to investigate the behavior, movements, thermal biology, and postrelease mortality of a wide range of large, highly migratory species including bluefin tuna (Block et al., 2001), swordfish (Sedberry and Loefer, 2001), blue marlin (Graves et al., 2002), striped marlin (Domeier and Dewar, 2003), and white sharks (Boustany et al., 2002). PSAT tag technology has improved rapidly, and current tag models are capable of collecting, processing, and storing large amounts of information on light level, temperature, and pressure (depth) for a predetermined length of time before the release of these tags from animals. After release, the tags float to the surface, and transmit the stored data to passing satellites of the Argos system

Couples vacations and romantic passion and intimacy.

Despite limited empirical support, vacations are marketed as beneficial for romantic partners. Using the self-expansion model as a foundation, we tested how self-expanding (e.g., novel, interesting, challenging) vacation experiences are associated with passion, physical intimacy, and relationship satisfaction. Study 1 (n = 238 partners) found that higher individual self-expanding experiences on vacations predicted higher post-vacation romantic passion and relationship satisfaction for couples traveling with their partners, but not those that did not travel together. Study 2 examined 102 romantic dyads that traveled together and found that higher self-expanding experiences on vacations predicted more post-vacation physical intimacy. Our findings advance self-expansion research and provide evidence for the tourism industry to design and promote self-expanding vacation experiences for couples seeking improved relationships and meaningful vacations.</p

An Examination of Children\u27s Outdoor Time, Nature Connection, and Environmental Stewardship

Abstract This study examined the relationship between children’s time spent outdoors, nature connection, and environmental stewardship. It was hypothesized that time spent outdoors predicted a feeling of connection to nature, and that connection to nature, in turn, influenced environmental stewardship. A total of 218 fifth-grade students from central Pennsylvania participated in the study. Baron and Kenny’s (1986) method was used to establish mediation using ordinary least squares regression. It was found that nature connection partially mediated the direct effect of time spent outdoors on environmental stewardship and increased the amount of variance explained. In other words, a feeling of connection to nature explained a portion of the effect that time spent outdoors has on environmental stewardship behaviors. Future studies that examine predictors of nature connection, including direct experience with nature, environmental education programs, and underlying personality characteristics, are warranted

Diet of the Invasive Lionfish Pterois sp. in Broward County, Florida

The geographic range of invasive lionfish Pterois sp. currently extends throughout the Greater Caribbean in the western North Atlantic, prompting concerns about the impacts of its predation on local ecosystems. We focused on dietary habits of lionfish in Broward County, Florida, where there is only limited, anecdotal information on the species’ prey selection. Diet was determined using percent number, percent occurrence and percent weight, as well as the composite index of relative abundance (%IRI). A high percent teleost diet was documented during the third quarter (July-September) and a high crustacean diet in the fourth quarter (October-December), but seasonal effects by quarter or wet-dry analyses were insignificant. We observed an ontogenetic shift from a mainly crustacean diet to one consisting of mainly teleost fishes: the smallest lionfish size group (5-10 cm) had a 100% crustacean diet, whereas the largest size group (35-40 cm) had a 77% teleost and 23% crustacean diet. Our study results found no evidence that lionfish consumed commercially or recreationally targeted teleost species in these nearshore reef habitats

Community-Based Research: Analysis of Outcomes for Learning and Social Change: An Introduction

Broadly defined, community-based research (CBR) is a process of conducting research that embraces and integrates the participation and local knowledge of people in communities and organizations with the goal of informing efforts to achieve social change. Although several publications on CBR exist, they primarily focus on processes, methods, and tools for developing and implementing CBR projects. This special issue of the Journal of Rural Social Sciences builds from that knowledge base, analyzes the outcomes of real-world CBR projects, and assesses learning outcomes for students, faculty, organizations, and community residents. This introduction to the special issue provides an overview of the academic and practical applications of community-based research that aim to achieve learning outcomes and social change for both university- and community-based partners. It includes a review of theoretical concepts and methodological approaches comprising CBR, followed by a summary of the articles in this issue

Ubiquitous microplastics in the upper gastrointestinal tracts of Florida coastal seabirds

Plastic pollution is increasingly recognized as a global problem. In particular, plastic pieces \u3c5 mm in size (‘microplastics’) are of interest due to their prevalence and association with harmful, persistent organic pollutants (POPs). Very little is known about the prevalence of microplastics in coastal birds. Yet, these water-associated birds are at a high risk of ingesting microplastics that accumulate near the water’s surface. This study describes the microplastics found in the proventriculus and ventriculus of four species of coastal birds regarding quantity, size, type (fiber or fragment), and color (light, mid, or dark). A total of 643 microplastic particles were identified, with 43 of the 44 study specimens containing microplastics (97.7% frequency). The ‘fiber’ type and the ‘mid’ color were the most common microplastics. There were no significant differences between species for particle sizes, but Brown Pelicans contained significantly more particles than the other three species. These results highlight the prevalence of plastic pollution in medium-sized seabirds, but more work is needed to determine microplastic patterns between taxa and foraging environments

Energy Dependence of Energy Partition in Products of Direct Reactions: Crossed‐Beam Studies and a New Model

This is the publisher's version, also available electronically from http://scitation.aip.org/content/aip/journal/jcp/48/9/10.1063/1.1669778

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

Joint United States-Brazil Billfish Research in the Western South Atlantic

A joint research project between Brazilian and U.S. scientists was initiated in 2004 to investigate the interaction of istiophorid billfishes with pelagic longline fisheries in the western equatorial South Atlantic Ocean. This project incorporates two general themes (1) an investigation into several aspects of pelagic longline operations by comparing catch results between circle and “J” style hooks, time-of-capture with hook time recorders, and by direct monitoring of pelagic longline gear behavior, and (2) an additional evaluation of billfish trophic ecology using a combination of satellite tag technology and traditional analyses (e.g., gut contents and ageing). Data obtained from this research will provide additional data for the evaluation of habitat-based stock assessment modeling efforts for billfish and other pelagic fish species