Impact of fisheries footprint on an early warning indicator of resilience reduction in marine net primary productivity

Zhao, Yu; Li, Yangfan

doi:10.1093/icesjms/fsac213

Cited by 4 publications

(1 citation statement)

References 49 publications

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“…Cairns (1987) pioneered an integrated approach to utilizing seabirds as indicators of marine food availability, and in a subsequent work (Cairns, 1992) he emphasized the imperative for enhanced collaboration between seabird biology and fisheries science to mutually advance the conservation of avian species and fish populations. In light of escalating apprehensions regarding the preservation of marine ecosystems, which support extensive fishing activities (Zhao & Li, 2022), the urgency of monitoring seabird diets and integrating seabird populations For each individual we reported the locality, date of recovery, status, age class and biometric measurements: body mass upon arrival at the center (BM); head length (HL) measured as the distance between the tip of the bill and the back of the head; beak length (BL) as the distance between the tip of the bill and feathers; bill depth (BD) as the distance between the top and bottom of the bill, measured at the gonys; as well as scores of the subcutaneous and abdominal fat and level of breast muscle in accordance with the EURING Code Manual (Du Feu et al, 2016; https://euring.org/data-and-codes/euring-codes). Stomach content was also indicated and the species identified and reported.…”

Section: Stomach Content Of Dead Razorbillsmentioning

confidence: 99%

First data on the diet of Razorbill Alca torda wintering in the Mediterranean Sea: insights from social media

MONTI,

MORI,

BALESTRIERI

et al. 2024

Mediterr. Mar. Sci.

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Understanding a species’ diet is of paramount importance to ecology as it provides vital insights into interactions between organisms and their environment. In this study, we report the first data on the diet of wintering Razorbills (Alca torda) in the Mediterranean Sea. Taking advantage of the irruption event that occurred in the Mediterranean in winter 2022/2023, a data mining search campaign was carried out on social media to collect photographs and videos documenting Razorbills feeding at sea. Additional information was gathered by analysing the stomach contents of dead individuals salvaged from the coastline of central Italy. Overall, we obtained records from 32 pictures and 7 videos as well as 7 dead individuals. All prey items belonged to class Actinopterygii. Overall, 12 fish prey were identified (2 at the family, 3 at the genus and 7 at the species level). Razorbills fed on small-medium sized fish species of the neritic zone such as Belone belone, Trachinotus ovatus, Atherina hepsetus and Engraulis encrasicolus. Razorbills were mostly observed foraging close to the coast and within harbours, as well as begging for food from humans, raising doubts about the feeding conditions encountered and the health status of individuals. Dead individuals mainly had empty stomachs, in line with the low weights and fat scores detected during necropsy. We underline how data from social media have made it possible to describe, using non destructive methods, the behaviour and feeding habits of an uncommon seabird typical of the North Atlantic Sea, which caught the attention of photographers, nature enthusiasts, and scientists.

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Section: Stomach Content Of Dead Razorbillsmentioning

confidence: 99%

First data on the diet of Razorbill Alca torda wintering in the Mediterranean Sea: insights from social media

MONTI,

MORI,

BALESTRIERI

et al. 2024

Mediterr. Mar. Sci.

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Ecosystem Resilience Monitoring and Early Warning Using Earth Observation Data: Challenges and Outlook

Bathiany,

Bastiaansen,

Bastos

et al. 2024

Surv Geophys

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As the Earth system is exposed to large anthropogenic interferences, it becomes ever more important to assess the resilience of natural systems, i.e., their ability to recover from natural and human-induced perturbations. Several, often related, measures of resilience have been proposed and applied to modeled and observed data, often by different scientific communities. Focusing on terrestrial ecosystems as a key component of the Earth system, we review methods that can detect large perturbations (temporary excursions from a reference state as well as abrupt shifts to a new reference state) in spatio-temporal datasets, estimate the recovery rate after such perturbations, or assess resilience changes indirectly from stationary time series via indicators of critical slowing down. We present here a sequence of ideal methodological steps in the field of resilience science, and argue how to obtain a consistent and multi-faceted view on ecosystem or climate resilience from Earth observation (EO) data. While EO data offers unique potential to study ecosystem resilience globally at high spatial and temporal scale, we emphasize some important limitations, which are associated with the theoretical assumptions behind diagnostic methods and with the measurement process and pre-processing steps of EO data. The latter class of limitations include gaps in time series, the disparity of scales, and issues arising from aggregating time series from multiple sensors. Based on this assessment, we formulate specific recommendations to the EO community in order to improve the observational basis for ecosystem resilience research.

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Productivity of Marine Ecosystem Components

Al-Sodany,

Diab

2023

Marine Ecology: Current and Future Developments

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The marine ecosystem is the greatest of all ecosystems. Marine ecosystems cover approximately seventy-one percent of the Earth's surface; moreover, they contain approximately ninety-seven percent of the planet's water. Thirty-two percent of the world's net primary production is generated by them. There are many marine ecosystems environmental problems, which include marine pollution, unsustainable exploitation of marine resources (as overfishing to certain species), building on coastal areas, and climate change. From the trophical standpoint, a marine ecosystem has two groups of components: autotrophic components and heterotrophic components. The primary or basic productivity of an ecosystem could be defined as the storing rate of radiant energy by producers (chemosynthetic and photosynthetic) activity as an organic substance that can be utilized as food. The productivity of marine ecosystem greatly refers to the organic matter production by producers or autotrophs “phytoplanktons and algae,” the produced organic carbon is supplied to “heterotrophs,” which obtain their energy only from the organic matter respiration. There are many carbon-nested cycles associated with marine productivity including Grass and Net Primary Productivity (GPP and NPP, respectively) as well as Net community and Secondary productivity (NCP and SP, respectively). Fisheries depend on secondary productivity; thus they rely on both Net primary productivity and the organic matter transferring efficiency to the food web. Environmental factors as well as the change of climate may strongly impact NPP in many ways that rely on the regional as well as local physical settings, ecosystem structure, and functioning medium. 

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Impact of fisheries footprint on an early warning indicator of resilience reduction in marine net primary productivity

Cited by 4 publications

References 49 publications

First data on the diet of Razorbill Alca torda wintering in the Mediterranean Sea: insights from social media

First data on the diet of Razorbill Alca torda wintering in the Mediterranean Sea: insights from social media

Ecosystem Resilience Monitoring and Early Warning Using Earth Observation Data: Challenges and Outlook

Productivity of Marine Ecosystem Components

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