Trophic status of a shallow lake in Inner Mongolia: long-term, seasonal, and spatial variation

Ecological Indicators, Journal Year: 2023, Volume and Issue: 156, P. 111167 - 111167

Published: Oct. 27, 2023

The study of lake-trophic status drivers and their variable effects over space time can assist in the management lake eutrophication. Winter dynamics trophic are rarely evaluated, yet they could vary drastically from more commonly sampled summer patterns. This represents a key blindspot our knowledge because ice sheets affect nutrient distribution (e.g., nitrogen phosphorus), light infiltration (translucency), phytoplankton propagation (Chl-a concentration). We examined long-term (2011–2020) changes (trophic level index; TLI) Lake Wuliangsuhai, shallow situated cold arid region, using Generalized Additive Models (GAMs). results suggested significant decrease eutrophication Wuliangsuhai period, with TLI decreasing 61.7 (moderately eutrophic) 2011 to 49.9 (mesotrophic) 2020. was significantly higher winter (p < 0.05), rank seasons terms of: (58.7) > (54.7) autumn (54.2) spring (54.0). ice-covered period exceeded that ice-free (54.3) 0.05). There were also spatial differences Factors driving temporal heterogeneity levels included water supplement, depth, temperature, external inputs nutrients, hydrodynamic conditions (flow velocity), phragmites, location main diversion channel.

Language: Английский

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Humpback-krill relationships are strongest at fine spatial scales in the Northern California Current region

Marine Ecology Progress Series, Journal Year: 2024, Volume and Issue: 729, P. 219 - 232

Published: Jan. 4, 2024

Understanding scale-dependent variability in predator-prey relationships is essential to ecosystem management. The Northern California Current (NCC) an important foraging ground for humpback ( Megaptera novaengliae ) and other rorqual whales, but it also area that presents diverse anthropogenic threats. Clarifying the most meaningful spatial scale analyze between whales krill, a key prey item, understanding function informing research management efforts. To examine spatially explicit krill NCC, we analyzed concurrent whale sightings acoustically detected abundance estimates collected May September 2018 2022. We used generalized additive mixed models predict occurrence at series of ecologically relevant nested scales: 1, 2, 5, 20 km. found relative 5 km had greatest influence on occurrence. Our results suggest may be both energetically profitable optimize efficiency detectable using our traditional methodological approaches (paired observer echosounder surveys). recommend zooplankton data incorporated into future distribution considered applications this region.

Language: Английский

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North Atlantic right whale density surface model for the US Atlantic evaluated with passive acoustic monitoring

Marine Ecology Progress Series, Journal Year: 2024, Volume and Issue: 732, P. 167 - 192

Published: Feb. 13, 2024

The Critically Endangered North Atlantic right whale Eubalaena glacialis entered a population decline around 2011. To save this species without closing the ocean to human activities requires detailed information about its intra-annual density patterns that can be used assess and mitigate human-caused risks. Using 2.9 million km of visual line-transect survey effort from US Canadian Maritimes conducted in 2003-2020 by 11 institutions, we modeled absolute (ind. -2 ) using spatial, temporal, environmental covariates at monthly time step. We accounted for detectability differences between platforms, teams, conditions, corrected all data perception availability biases, accounting platform differences, dive behavior, group composition, size. produced maps predicted evaluated our results independently collected passive acoustic monitoring (PAM) data. Densities correlated positively (r = 0.46, ρ 0.58, τ 0.46) with detection rates obtained 492 stationary PAM recorders deployed across study area (mean recorder duration 138 d). This is first quantify concurrence observations waters. summarized predictions into mean uncertainty 2003-2009 2010-2020 eras, based on significant changes species’ spatial distribution began 2010. striking shifts provide effort- bias-corrected surfaces inform risk assessments, estimations take, marine planning.

Language: Английский

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Krill swarm biomass, energetic density, and species composition drive humpback whale distribution in the Northern California Current

ICES Journal of Marine Science, Journal Year: 2025, Volume and Issue: 82(1)

Published: Jan. 1, 2025

Abstract Prey abundance and quality are dynamic in time space, impacting predator ecology. We examine variation species-specific krill quantity as prey for humpback whales the Northern California Current region, using generalized additive models to assess metrics including biomass energy density derived from an integrated dataset of concurrent active acoustics, net tows, marine mammal observations (2018–2022). Overall, were positively correlated with whale presence, increasing trends modified by seasonal (early versus late foraging season) spatial (continental shelf offshore) (model deviance explained 36.3%–40.8%). Biomass had strong positive effects on suggesting target high-quality swarms that offer more per lunge. Elevated Thysanoessa spinifera near suggests they this species, particularly season when energetically richer than Euphausia pacifica, region’s other abundant species. Environmental change may decrease quality, whales’ ability meet energetic requirements potentially driving changes their distributions exposure anthropogenic threats. Clarifying drivers patch selection can improve species distribution aid managers mitigating risk whales.

Language: Английский

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Embracing social-ecological system complexity to promote climate-ready fisheries

Reviews in Fish Biology and Fisheries, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 27, 2025

Language: Английский

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Mapping the value of commercial fishing and potential costs of offshore wind energy on the U.S: West Coast: Towards an assessment of resource use tradeoffs

PLoS ONE, Journal Year: 2025, Volume and Issue: 20(3), P. e0315319 - e0315319

Published: March 6, 2025

The West Coast of the U.S. has a vast offshore wind energy (OWE) electricity generation potential with value on order billions USD, and pressure is mounting to develop large OWE projects. However, this seascape numerous existing resource extraction uses, including multi-billion dollar commercial fishing industry, which create for conflict. To date, spatially explicit comparisons fisheries have not been done, but are essential marine spatial planning investigating tradeoffs development uses. In analysis, we generate maps levelized cost total economic activity generated by top eight targets that account majority (~84%) landed revenue off Coast. We quantify overlap between these two ocean uses use multiobjective optimization tradeoff frontiers investigate implications both sectors from established state goals or mandates power capacity. There clear differences in exposure each fishery their traditional grounds as function differing capacity outcomes vary depending whether achieved at state-by-state level region-wide level. Responsible siting projects includes careful consideration activities, responsible transition renewable energies elsewhere accounts socio-economic consequences associated fishery.

Language: Английский

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A “war” over lobster and whales: The issue-attention cycle, media discourse, and political ecology of right whale science and conservation in six US newspapers

Frontiers in Communication, Journal Year: 2024, Volume and Issue: 9

Published: Aug. 23, 2024

News organizations and journalists are important influential actors in environmental politics. Their reporting on social issues often follows issue-attention cycles (IACs) that emphasize drama problematization to maintain public interest. This study examined nearly 13 years of news coverage understand the media discourse about Critically Endangered North Atlantic right whale (NARW) its conservation. Content analysis critical were used analyze 356 texts published six large US newspapers between January 1, 2010 March 15, 2023. NARW conservation management received increased attention an IAC began 2017 after Unusual Mortality Event began, with 75 percent sampled articles ( n = 267) from on. The Boston Globe a majority 209) reporter David Abel was most prolific journalist 50 bylines. featured themes representing threats species, science technological development, tourism, local lifestyle, culture. common topic American lobster fishing gear entanglements 162, 45.5%). In emphasized political ecology conservation, focusing disagreements experts advocates commercial fishermen their allies as they sought influence decision making by National Marine Fisheries Service. Journalists presented issue through conflict frame each group distinct discursive strategies attempt shape opinion related new or stricter regulations for fishery designed reduce risk entanglement NARWs. Findings suggest this has already moved at least three five key stages will inevitably lose interest, which implications future communication advocacy case demonstrates continued importance – forums discussion, essential parts organizational change, externality can outcomes. Support research practice vital successful

Language: Английский

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Modeling the spatiotemporal patterns and drivers of Dungeness crab fishing effort to inform whale entanglement risk mitigation on the U.S. West Coast

Journal of Environmental Management, Journal Year: 2023, Volume and Issue: 351, P. 119735 - 119735

Published: Dec. 19, 2023

Language: Английский

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Ecotype Origin of an Entangled Killer Whale (Orcinus orca) Identified with Remnant mtDNA

Aquatic Mammals, Journal Year: 2024, Volume and Issue: 50(1), P. 45 - 50

Published: Jan. 12, 2024

Language: Английский

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A longitudinal study of endocrinology and foraging ecology of subadult gray whales prior to death based on baleen analysis

General and Comparative Endocrinology, Journal Year: 2024, Volume and Issue: 352, P. 114492 - 114492

Published: March 11, 2024

Language: Английский

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