Animal migration in the Anthropocene: threats and mitigation options

Biological reviews/Biological reviews of the Cambridge Philosophical Society, Journal Year: 2024, Volume and Issue: 99(4), P. 1242 - 1260

Published: March 4, 2024

ABSTRACT Animal migration has fascinated scientists and the public alike for centuries, yet migratory animals are facing diverse threats that could lead to their demise. The Anthropocene is characterised by reality humans dominant force on Earth, having manifold negative effects biodiversity ecosystem function. Considerable research focus been given assessing anthropogenic impacts numerical abundance of species/populations, whereas relatively less attention devoted animal migration. However, there clear linkages, example, where human‐driven behaviour can population/species declines or even extinction. Here, we explore (in all domains – aquatic, terrestrial, aerial) using International Union Conservation Nature (IUCN) Threat Taxonomy classifications. We reveal (e.g. human development, disease, invasive species, climate change, exploitation, pollution) impact wildlife in varied ways spanning taxa, life stages type from direct mortality changes behaviour, health, physiology). Notably, these often interact complex unpredictable detriment wildlife, further complicating management. Fortunately, beginning identify strategies conserving managing Anthropocene. provide a set that, if embraced, have potential ensure animals, important ecological functions sustained migration, persist.

Language: Английский

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The physiological stress response of juvenile nurse sharks (Ginglymostoma cirratum) to catch-and-release recreational angling

PLoS ONE, Journal Year: 2025, Volume and Issue: 20(1), P. e0316838 - e0316838

Published: Jan. 3, 2025

Nurse sharks ( Ginglymostoma cirratum ), especially juveniles, are often encountered by near-shore and shore-based recreational anglers suggested to exhibit minimal behavioral physiological responses capture, largely based on studies of adults using commercial or scientific fishing methods. To quantify the sub-lethal effects angling juvenile nurse sharks, 27 individuals (across 31 events) were caught hook-and-line Over a 30-min period, 4 blood samples taken with variable time intervals between sampling i . e ., randomized ordering an interval 5, 10, 15 min each event). Lactate increased 611% (6.7 ± 2.17 mmol/L) average over fight, significant relationships identified lactate draw number, fight time, temperature, large effect sizes. Significant also detected glucose, hematocrit, while osmolality was only affected site. These results suggest may greater stress response when exposed than captured other

Language: Английский

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Warming waters lead to increased habitat suitability for juvenile bull sharks (Carcharhinus leucas)

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

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Impacts of artisanal fishing on elasmobranchs along the Brazilian Amazon Coast

Fisheries Research, Journal Year: 2025, Volume and Issue: 284, P. 107304 - 107304

Published: Feb. 27, 2025

Language: Английский

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A Review of Fisheries and Conservation of the Atlantic Nurse Shark, Ginglymostoma cirratum (Bonnaterre, 1788), (Orectolobiformes: Ginglymostomatidae) in the Atlantic Ocean

Fisheries Management and Ecology, Journal Year: 2025, Volume and Issue: unknown

Published: May 9, 2025

ABSTRACT The Atlantic nurse shark ( Ginglymostoma cirratum ) is listed as vulnerable by the IUCN, mainly due to overfishing. We reviewed literature on fishing for this species and identified catches in 26 locations nine countries Americas Africa, including artisanal 10 locations, incidental six, landing three, sport one, three not specified. Consumption of meat, cartilage, oil was also reported. Fishing methods included gillnets, longlines, trolling, traps, nets (trammel nets, cast, trawl), handlines, windlass, spearfishing. prohibited Brazil, Colombia, Guinea‐Bissau. All except São Tomé Príncipe USA have conservation strategies place. Without effective sustainable alternatives, populations could decline, thereby threatening marine ecosystems where it plays a key role.

Language: Английский

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Exploring the extensive movements and home range of one of North America’s most mobile fish: the freshwater drum (Aplodinotus grunniens)

Environmental Biology of Fishes, Journal Year: 2024, Volume and Issue: unknown

Published: Nov. 22, 2024

Abstract Freshwater drum Aplodinotus grunniens are a unique and ubiquitous freshwater species of the family Sciaenidae. Despite species’ wide distribution biogeography, life history, behavior, surprisingly little is known about movement ecology. In this study, we use passive acoustic telemetry tags broad-scale gridded receiver array to track interannual seasonal tagged in tributaries North South Basins Lake Winnipeg (Manitoba, Canada). First, had lower survival south basin where higher fishing pressure thought be cause mortality. We found that remarkably mobile, with mean monthly rates among highest on record for any fish. spring, fish entered rivers prior spawning. A few weeks later, most individuals moved into lake habitat they made extensive lateral movements. Home range hotspot analysis revealed population-specific patterns occupancy, elevated densities during ice-on period dispersed distributions open water. Both populations remained almost exclusively their respective basins. Homing site fidelity were apparent, nearly all returning original tagging river each successive spawning season. The results bolster existing information ecology may help enhance conservation management strategies, particularly toward addressing commercial bycatch.

Language: Английский

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Applying acoustic telemetry, vessel tracking and fisher knowledge to investigate and manage fisher-shark conflict at Lord Howe Island, Australia

Marine Biology, Journal Year: 2024, Volume and Issue: 171(12)

Published: Nov. 7, 2024

Abstract Fisher-shark conflict is occurring at Lord Howe Island, Australia due to high levels of Galapagos shark ( Carcharhinus galapagensis ) depredation (where sharks consume hooked fish) and bycatch. Depredation causes costly loss target catch fishing gear increased mortality species, can be injured or killed when bycaught. This study applied acoustic telemetry vessel tracking from 2018 2021 identify; (1) how the movements 30 tagged activity six vessels overlapped, (2) where key ‘hotspots’ overlap occurred. Fisher surveys were also conducted collect information about mitigating interactions. Residency index analysis indicated that three a fish waste dumping site had markedly higher residency. Core home ranges overlapped with four ‘hotspots’. Statistical modelling positive linear effects bathymetric complexity on detections present for 13% total time close receivers. Spatio-temporal overlaps between could potentially have occurred because learned associate food (i.e. fishers utilise highly productive shelf edge areas, however more research needed investigate these relationships. Fishers reported rotating areas reducing each location, deeper than 100 m, using electric reels lures instead bait, reduced bycatch depredation. The integrated approach used here identified practical methods fisher-shark conflict, improving socio-economic outcomes conservation prospects this unique population.

Language: Английский

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Both Environmental Conditions and Intra‐ and Interspecific Interactions Influence the Movements of a Marine Predator

Ecology and Evolution, Journal Year: 2024, Volume and Issue: 14(12)

Published: Nov. 28, 2024

Animal movements are typically influenced by multiple environmental factors simultaneously, and individuals vary in their response to this heterogeneity. Therefore, understanding how aspects, including biotic, abiotic, anthropogenic factors, influence the of wild animals is an important focus wildlife research conservation. We apply Exponential Random Graph Models (ERGMs) analyze movement networks a bull shark population network acoustic receivers identify effects environmental, social, or other types covariates on movements. found that intra- interspecific often had stronger than variables. ERGMs proved be potentially useful tool for studying animal data, especially context spatial attribute

Language: Английский

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Determining the role of environmental covariates on planktivorous elasmobranch population trends within an isolated marine protected area

Marine Ecology Progress Series, Journal Year: 2023, Volume and Issue: 722, P. 107 - 123

Published: Sept. 15, 2023

Studies have found predictable relationships between the behavior of planktivores and environmental conditions, suggesting that they may be especially sensitive to change. Most studies date, however, are based on limited observations, include few covariates influence planktivore behavior, often do not occur over long enough durations determine effects As such, exploration long-term data sets is necessary disentangle potential impacts oceanographic variability. To elucidate relationship 3 groups planktivorous elasmobranchs (whale sharks Rhincodon typus , mobula rays Mobula spp., manta Manta birostris) variability, we employ hierarchical modeling examine trends in elasmobranch counts from underwater visual censuses (UVCs), conducted last 27 yr (1993-2019) by divemasters Cocos Island, Costa Rica. Data UVCs were integrated with primarily remotely sensed data. Models revealed for elasmobranchs, variables (chlorophyll a lunar cycle, salinity) correlated occurrence predicted relative abundances. In phases lower illuminations, there significant increases abundances rays, increased chlorophyll decreased whale shark abundance, salinity abundance but did correlate observations mantas or sharks. Our findings highlight need consider conditions when evaluating efficacy marine protection demonstrate ranging variability at Cocos.

Language: Английский

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Humans influence shark behavior: Evidence from the COVID-19 lockdown

Ocean & Coastal Management, Journal Year: 2023, Volume and Issue: 248, P. 106965 - 106965

Published: Dec. 8, 2023

Achieving the UN SD Goals requires conservation of keystone marine species. As top predators, many sharks play a crucial role in balancing ecosystems; yet, they have been experiencing severe population declines. Overfishing is indisputably main threat to shark populations, but little known about impact non-extractive human pressure. This study tests effect varied presence on behavior at an insular reserve. In 2020, humans were virtually absent from Fernando de Noronha (FEN), Brazil, during 211-days lockdown period prompted by COVID-19 pandemics. A local tracking program rendered nearly 280000 acoustic detections coastal waters 2016 through 2021. Lemon sharks, Negaprion brevirostris, showed 43% increase detection rate which was ascribed concomitant decrease presence. contrast, tiger Galeocerdo cuvier, decreased 67% lockdown, this trend likely related seasonality behavior. After both species' rates tended return previous levels. Further, lemon increased diurnal residency and made more use areas less restrictive whilst nocturnal after period. Contrasting trends might relate with completing their life cycle FEN being migrants arriving older ages exposed anthropogenic stimuli across ontogeny. demonstrates that disturbance can induce significant changes way predators explore habitats for accomplishing trophic, reproductive, ontogenetic functions. Ascertaining ecological impacts marine-based development should thus consider cryptic responses megafauna landscape produced ever-growing population. The designation exclusion could emerge as single solution endow populations suitable optimizing resilience

Language: Английский

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