Depredation: An old conflict with the sea DOI
J. Marcus Drymon,

Amanda E. Jargowsky,

Evan Gerald Prasky

et al.

Fish and Fisheries, Journal Year: 2024, Volume and Issue: 25(5), P. 806 - 810

Published: May 25, 2024

Abstract Depredation (the partial or complete removal of a hooked species by non‐target species) is human–wildlife conflict as old humans and the sea. In some ways, depredation no different today than it was century ago. But in many this has become more complicated. Following three decades successful management, US shark populations have begun to rebuild. However, anglers attribute perceived increases management measures, claiming they led ‘overpopulation’ sharks and/or learned behaviour sharks. We investigated whether these factors could explain reported depredation. Based on fishery‐independent surveys, neither population nor evident. angler effort provide an alternative explanation that not often considered. While far from smoking gun, at least four themes emerge thought exercise. First, important understand historical predator baselines. Second, acknowledge lifting baselines, is, instances where previously depleted are recovering. Third, remember there when stakeholder observations were initially misaligned with traditional scientific but ultimately recognized pivotal for filling data gaps. Finally, perhaps most important, acknowledgement potent real conflict. Arguably, may matter if increased decreased; overwhelming perception stakeholders increase depredation, (or real) must be addressed.

Language: Английский

The role of food industries in sustainability transition: a review DOI
S. R. Mahadeva Prasanna, Praveen Verma,

Suman Bodh

et al.

Environment Development and Sustainability, Journal Year: 2024, Volume and Issue: unknown

Published: Feb. 16, 2024

Language: Английский

Citations

18
A marine protected area network does not confer community structure resilience to a marine heatwave across coastal ecosystems DOI Creative Commons
Joshua G. Smith, Christopher M. Free, Cori Lopazanski

et al.

Global Change Biology, Journal Year: 2023, Volume and Issue: 29(19), P. 5634 - 5651

Published: July 13, 2023

Abstract Marine protected areas (MPAs) have gained attention as a conservation tool for enhancing ecosystem resilience to climate change. However, empirical evidence explicitly linking MPAs enhanced ecological is limited and mixed. To better understand whether can buffer impacts, we tested the resistance recovery of marine communities 2014–2016 Northeast Pacific heatwave in largest scientifically designed MPA network world off coast California, United States. The consists 124 (48 no‐take state reserves, 76 partial‐take or special regulation areas) implemented at different times, with full implementation completed 2012. We compared fish, benthic invertebrate, macroalgal community structure inside outside 13 across rocky intertidal, kelp forest, shallow reef, deep reef nearshore habitats California's Central Coast region from 2007 2020. also explored features, including age, size, depth, proportion rock, historic fishing pressure, habitat diversity richness, connectivity, fish biomass response ratios (proxy performance), conferred forest intertidal spanning 28 network. Ecological dramatically shifted due all four habitats, did not facilitate habitat‐wide recovery. Only significantly resist impacts. Community shifts were associated pronounced decline relative cold water species an increase warm species. features explain heatwave. Collectively, our findings suggest that ability mitigate impacts heatwaves on structure. Given mechanisms perturbations are complex, there clear need expand assessments ecosystem‐wide consequences resulting acute climate‐driven perturbations, potential role regulatory protection mitigating changes.

Language: Английский

Citations

27
Coupling state‐of‐the‐art modelling tools for better informed Red List assessments of marine fishes DOI
Arnaud Grüss, Henning Winker, James T. Thorson

et al.

Journal of Applied Ecology, Journal Year: 2024, Volume and Issue: 61(4), P. 647 - 657

Published: Feb. 14, 2024

Abstract In the face of biodiversity loss worldwide, it is paramount to quantify species' extinction risk guide conservation efforts. The International Union for Conservation Nature (IUCN)'s Red List considered global standard evaluating risks. IUCN criteria also inform national assessments. Bayesian models, including state‐of‐the‐art JARA (‘Just Another Assessment’) tool, deliver probabilistic statements about species falling into categories, thereby enabling characterisation and communication uncertainty in We coupled VAST (‘Vector Autoregressive Spatio‐Temporal’) modelling tool JARA, better informed assessments marine fishes. this framework, fitted scientific survey catch rate data provide indices whose propagated outcomes suggesting categories (under population reduction criterion). addition, delivers a valuable habitat assessment understand what may be driving study region. Here, we demonstrate VAST‐JARA framework by applying five contrasting North Sea species, with or without quantitative stock different statuses according latest application previous studies suggest that, among three elasmobranchs, starry ray most need urgent research (and actions where appropriate), followed spurdog, while lesser‐spotted dogfish increasing biomass. Moreover, both indicate European plaice not concern, cod has likely met being listed as Endangered recently. Synthesis applications . predictions output assessment, constitute supporting information make interpretations based on guidelines, which will help decision‐makers their next assessment. foresee assist numerous fishes worldwide. Our many potential advantageous uses, informing resource management climate change impacts

Language: Английский

Citations

5
Long‐term effects of climate change on juvenile bull shark migratory patterns DOI Creative Commons
Philip Matich, Jeffrey D. Plumlee, Walter J. Bubley

et al.

Journal of Animal Ecology, Journal Year: 2024, Volume and Issue: 93(10), P. 1445 - 1461

Published: July 17, 2024

Abstract Seasonal variability in environmental conditions is a strong determinant of animal migrations, but warming temperatures associated with climate change are anticipated to alter this phenomenon unknown consequences. We used 40‐year fishery‐independent survey assess how changing has altered the migration timing, duration and first‐year survival juvenile bull sharks ( Carcharhinus leucas ). From 1982 2021, estuaries western Gulf Mexico (Texas) experienced mean increase 1.55°C autumn water temperatures, delays cold fronts by ca. 0.5 days per year. Bull shark migrations more northern concomitantly changed, departures 25–36 later 2021 than 1982. Later, resulted reduced overwintering durations up 81 days, relative abundance post‐overwintering age 0–1 increased >50% during study period. Yet, reductions prey availability were most influential factor delaying migrations. Juvenile remained natal longer when less abundant. Long‐term declines reportedly occurred due spawning success based on published reports. Consequently, waters likely enabled indirectly caused observed changes migratory behaviour. As continue rise, north‐western could forgo their winter next 50–100 years current trends physiological limits, thereby altering ecological roles estuarine ecosystems recruitment into adult population. It unclear if food webs will be able support residency patterns as affects forage species. expect these not unique or sharks, predators subtropical latitudes similarly at global scale.

Language: Английский

Citations

5
High overexploitation risk due to management shortfall in highly traded requiem sharks DOI Creative Commons
C. Samantha Sherman,

Eric D. Digel,

Patrick Zubick

et al.

Conservation Letters, Journal Year: 2023, Volume and Issue: 16(2)

Published: Feb. 21, 2023

Abstract Most of the international trade in fins (and likely meat too) is derived from requiem sharks (family Carcharhinidae), yet only two 56 species currently regulated. Here, we quantify catch, trade, and shortfall national regional fisheries management (M‐Risk) for all shark based on 831 assessments across 30 countries four Regional Fisheries Management Organizations (RFMOs). Requiem comprise over half (60%) annual reported global Chondrichthyan catch with most (86%) identified fin trade. are inadequately managed by fisheries, an average M‐Risk (50%) ideal score, consequently 70% threatened globally. The high volume these iconic require worldwide sustainable supported full implementation CITES regulations this newly listed family.

Language: Английский

Citations

11
Warming waters lead to increased habitat suitability for juvenile bull sharks (Carcharhinus leucas) DOI Creative Commons
Lindsay Mullins, John Cartwright, Steven L. Dykstra

et al.

Scientific Reports, Journal Year: 2024, Volume and Issue: 14(1)

Published: March 14, 2024

Abstract Coastal ecosystems are highly vulnerable to the impacts of climate change and other stressors, including urbanization overfishing. Consequently, distributions coastal fish have begun change, particularly in response increasing temperatures linked change. However, few studies evaluated how natural anthropogenic disturbances can alter species conjunction with geophysical habitat alterations, such as changes land use cover (LU/LC). Here, we examine spatiotemporal distribution juvenile bull sharks ( Carcharhinus leucas ) using a multi-decadal fishery-independent survey Alabama. Using boosted regression tree (BRT) modeling framework, assess covariance environmental conditions (sea surface temperature, depth, salinity, dissolved oxygen, riverine discharge, Chl-a) well historic LU/LC sharks. Species models resultant from BRTs for early (2003–2005) recent (2018–2020) monitoring periods indicated mean increase suitability (i.e., probability capture) 0.028 0.082, concomitant substantial increases annual temperature (0.058°C/yr), Chl-a (2.32 mg/m 3 ), (increased LU/LC) since 2000. These results align observed five-fold relative abundance across study period demonstrate changing on their abundance. As persists, communities will continue altering structure ecological success nearshore fisheries.

Language: Английский

Citations

4
Long term declines in the functional diversity of sharks in the coastal oceans of eastern Australia DOI Creative Commons
Christopher J. Henderson, Ben L. Gilby, Mischa P. Turschwell

et al.

Communications Biology, Journal Year: 2024, Volume and Issue: 7(1)

Published: May 21, 2024

Abstract Human impacts lead to widespread changes in the abundance, diversity and traits of shark assemblages, altering functioning coastal ecosystems. The functional consequences declines are often poorly understood due absence empirical data describing long-term change. We use from Queensland Shark Control Program eastern Australia, which has deployed mesh nets baited hooks across 80 beaches using standardised methodologies since 1962. illustrate consistent richness quantified both ecological (e.g., feeding, habitat movement) morphological size, morphology) traits, this corresponds with declining functioning. demonstrate a community shift targeted apex sharks greater non-target species. Declines corresponding species may an anthropogenically induced trophic cascade. suggest that repairing diminished populations is crucial for stability

Language: Английский

Citations

4
Ecological erosion and expanding extinction risk of sharks and rays DOI
Nicholas K. Dulvy, Nathan Pacoureau, Jay H. Matsushiba

et al.

Science, Journal Year: 2024, Volume and Issue: 386(6726)

Published: Dec. 5, 2024

The true state of ocean biodiversity is difficult to assess, and there are few global indicators track the primary threat overfishing. We calculated a 50-year Red List Index extinction risk ecological function for 1199 sharks rays found that since 1970, overfishing has halved their populations worsened by 19%. Overfishing largest species in nearshore pelagic habitats risks loss ecomorphotypes 5 22% erosion functional diversity. Extinction higher countries with large human coastal but lower nations stronger governance, larger economies, greater beneficial fisheries subsidies. Restricting fishing (including incidental catch) trade sustainable levels combined prohibiting retention highly threatened can avert further depletion, widespread population connectivity, top-down predator control.

Language: Английский

Citations

4
The Spatial Distribution Dynamics of Shark Bycatch by the Longline Fishery in the Western and Central Pacific Ocean DOI Creative Commons
Shaohong Xia, Jiaqi Wang,

Xiaodi Gao

et al.

Journal of Marine Science and Engineering, Journal Year: 2025, Volume and Issue: 13(2), P. 315 - 315

Published: Feb. 8, 2025

Shark bycatch represents a substantial issue in the management of oceanic fisheries. Utilizing data on shark from longline fishery, as released by Western and Central Pacific Fisheries Commission, this study applied boosted regression tree model to examine impact environmental factors per unit effort (BPUE) key species, well predict spatial distribution dynamics both BPUE risk (BR). The findings emphasize that oxygen concentration, sea surface temperature, chlorophyll-a concentration are paramount sharks’ BPUE. Furthermore, compared variations preferences across diverse pinpointing attributes defining ecological niches distinct populations. predictions identified hotspots BR for bigeye thresher (Alopias superciliosus), longfin mako (Isurus paucus), silky (Carcharhinus falciformis), whitetip longimanus) tropical latitudes (10° S 15° N), blue (Prionace glauca) shortfin oxyrinchus) temperate zones (south 30° or north N). geometric center analysis indicated all species exhibited large annual fluctuations BR, most populations displayed significant shifting trends. Several grids (5° × 5°) were high-risk areas due their considerable contribution bycatch. centers observed shift eastward towards equatorial waters, This underscores necessity considering beyond when identifying critical implementation area-specific mitigation measures. insights derived can enhance support development enforcement targeted area-based fishery initiatives.

Language: Английский

Citations

0
Call to Action for Conservation of the Critically Endangered Ganges Shark (Glyphis gangeticus) DOI Open Access
Kritish De, Arvind Kumar Dwivedi

Aquatic Conservation Marine and Freshwater Ecosystems, Journal Year: 2025, Volume and Issue: 35(2)

Published: Feb. 1, 2025

Language: Английский

Citations

0