LIVIVO - Search results -

Search results

Result 1 - 10 of total 24

Search options

Article: Food web model to assess the fishing impacts and ecological role of elasmobranchs in a coastal ecosystem of Southern Brazil

Rupp, Aurora / Bornatowski, Hugo

Environmental biology of fishes. 2021 Aug., v. 104, no. 8

2021

Abstract: Large sharks generally occupy the highest trophic levels and are important links in the structuring of trophic networks. However, the decline of these predators has been observed worldwide, with population reduction rates reaching over 90% for some ... ...

Abstract	Large sharks generally occupy the highest trophic levels and are important links in the structuring of trophic networks. However, the decline of these predators has been observed worldwide, with population reduction rates reaching over 90% for some species. Through these declines, it is believed that the effect of the loss of predators could result in the disturbances in ecosystems. Based on this, the present study aimed to test the role of elasmobranchs in a coastal ecosystem in southern Brazil. Also, we tested if the changes in fishing effort cause changes in trophic structure. For this, a trophodynamic model was performed, based on reliable data on biomass and species feeding in the region. The mass balance modeling software Ecopath with Ecosim (EwE) was used to assess the trophic position of sharks and rays, and to understand what their interactions are with other groups in the ecosystem. Among the parameters of the model, the Paraná coast showed to be an immature system, with high connectivity and medium complexity. The trophic levels of the coast varied from 1 to 4.4, with level > 4 composed of sharks, and rays belonging to the third trophic level. Sharks were strong impacted by fishing. According to changes in fishing effort simulations, we observed changes of intermediate levels due to the decline of large sharks. However, no cascade effects were observed from the simulations. The high diversity of the system, feeding overlap, and the redundancy between mesopredator and other teleosts can decrease the chances of a cascade effect occurring.
Keywords	Elasmobranchii ; biomass ; coastal ecosystems ; coasts ; computer software ; mesopredators ; models ; trophic levels ; Brazil
Language	English
Dates of publication	2021-08
Size	p. 905-921.
Publishing place	Springer Netherlands
Document type	Article
ZDB-ID	196790-3
ISSN	1573-5133 ; 0378-1909
ISSN (online)	1573-5133
ISSN	0378-1909
DOI	10.1007/s10641-021-01120-9
Database	NAL-Catalogue (AGRICOLA)

In stock of ZB MED Bonn / Germany

Z 78/723: Show issues
Z 6203: Show issues

Order via subito

This service is chargeable due to the Delivery terms set by subito. Orders including an article and supplementary material will be classified as separate orders. In these cases, fees will be demanded for each order.

Inter-library loan at ZB MED

Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

Details ▾
- See ZB MED holdings
- Order with fees

Article: A look at the unknown: Potential impact of marine recreational fishing on threatened species in the Southern Atlantic Ocean

Martinazzo, Giuliano Menegale / Giareta, Eloísa Pinheiro / Bornatowski, Hugo / Abilhoa, Vinicius / Freitas, Matheus

Ocean & coastal management. 2022 Mar. 01, v. 218

2022

Abstract: Brazil is currently facing one of the worst environmental crises in history. The over-exploitation of natural resources, unrestrained expansion of fisheries, and mostly ineffective conservation policies impose great difficulty in regulating and ... ...

Abstract	Brazil is currently facing one of the worst environmental crises in history. The over-exploitation of natural resources, unrestrained expansion of fisheries, and mostly ineffective conservation policies impose great difficulty in regulating and supervising fishing activities, whether commercial or recreational. Unreported and unregulated recreational fisheries are largely carried out along the Brazilian coast; however, their potential for exploitation of fish stocks remain unknown. To obtain data regarding this popular and poorly known leisure activity, we compiled information on catches posted by recreational anglers on a social media platform between 2008 and 2013. Photographic records of fish caught on the continental shelf off the southern Atlantic Ocean in Brazil were downloaded and assessed, and species were identified and quantified (trophies and total captures) for each fishing trip (day), including the number of anglers, totaling 788 fishing days, with an average of 4.2 anglers/day. A total of 50 species were recorded: eight elasmobranchs and 42 teleosteans. Regarding conservation status, 25 species were categorized as threatened (25.5%) and one as data deficient (25.5%) at the global level according to the International Union for Conservation of Nature. Notably, elasmobranchs, dolphinfishes, bluefishes, croakers, triggerfishes, Atlantic bigeyes, and sharks showed high capture frequencies. Our results indicate the need for an efficient system to monitor recreational fishing, as well as co-management plans discussed with all stakeholders to control and reduce the worrying rate of capture of threatened species.
Keywords	Balistidae ; Coryphaenidae ; Elasmobranchii ; coastal zone management ; coasts ; collaborative management ; conservation status ; continental shelf ; stakeholders ; threatened species ; Atlantic Ocean ; Brazil
Language	English
Dates of publication	2022-0301
Publishing place	Elsevier Ltd
Document type	Article
ISSN	0964-5691
DOI	10.1016/j.ocecoaman.2022.106044
Database	NAL-Catalogue (AGRICOLA)

Order via subito

Inter-library loan at ZB MED

Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

Article: Patterns and partitioning of food resources by elasmobranchs in southern Brazil

Hayata, Maiara A / Bornatowski, Hugo / Freitas, Renato H. A

Environmental biology of fishes. 2021 Apr., v. 104, no. 4

2021

Abstract: Our study sought to analyze patterns and overlap in prey items consumed by elasmobranch species in southern Brazil through a complex network analysis. We hypothesized that species with the same habitat use would show greater trophic niche overlap and ... ...

Abstract	Our study sought to analyze patterns and overlap in prey items consumed by elasmobranch species in southern Brazil through a complex network analysis. We hypothesized that species with the same habitat use would show greater trophic niche overlap and lower diet specialization than species with different habitat use. We conducted a literature survey of the species recorded in southern Brazil and analyzed publications with quantitative data on the diet of each species. We found records of 103 species in the region, of which 58 had their diets analyzed and had quantitative data to contribute to this analysis. The results suggest nested diet patterns in this community. Nestedness may arise for different reasons, and suggests that species might be balancing their high feeding niche overlap through compensatory mechanisms. There are no prior records of such a pattern in elasmobranch communities, which brings to light important information about their feeding niche. Data on prey consumption and temporal and spatial patterns of elasmobranch feeding may yield further insight into how these species are interacting in the environment and assist the investigation of the processes that shaped the current community’s trophic structure.
Keywords	Elasmobranchii ; diet ; habitat preferences ; nestedness ; surveys ; Brazil
Language	English
Dates of publication	2021-04
Size	p. 437-450.
Publishing place	Springer Netherlands
Document type	Article
Note	NAL-AP-2-clean
ZDB-ID	196790-3
ISSN	1573-5133 ; 0378-1909
ISSN (online)	1573-5133
ISSN	0378-1909
DOI	10.1007/s10641-021-01082-y
Database	NAL-Catalogue (AGRICOLA)

In stock of ZB MED Bonn / Germany

Z 78/723: Show issues
Z 6203: Show issues

Order via subito

Inter-library loan at ZB MED

Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

Details ▾
- See ZB MED holdings
- Order with fees

Article: Geographic bias in the media reporting of aquatic versus terrestrial human predator conflicts and its conservation implications

Bornatowski, Hugo / Hussey, Nigel E / Sampaio, Cláudio L.S / Barreto, Rodrigo R.P

Associação Brasileira de Ciência Ecológica e Conservação Perspectives in ecology and conservation. 2018 Dec. 19,

2018

Abstract: Interactions or conflicts between humans and large predators occur globally, but an understanding of their spatial occurrence and associated media reporting remains limited. Media reach is now global and rapid, particularly through western news outlets ... ...

Abstract	Interactions or conflicts between humans and large predators occur globally, but an understanding of their spatial occurrence and associated media reporting remains limited. Media reach is now global and rapid, particularly through western news outlets and amplified by social networks. This has consequences for how the public perceive human-predator conflicts and in turn how this impacts species' conservation and management. To address this point, a literature search was undertaken to synthesize global records of predator-human conflicts followed be an assessment of media reporting of conflicts, for both aquatic (sharks) and terrestrial (lion, tiger, leopard, cougar, puma, bear spp.) species. We show that predator-human conflicts involving terrestrial mammals occur predominantly in developing" nations (>90%) while aquatic predator-human conflicts occur (65%) and are principally reported from developed nations. Moreover, media reporting of sharks is dominated by attacks on humans and sensationalized documentation of incidences compared to those involving terrestrial species. As a result, high media coverage of shark-human conflicts may lead humans to overestimate the risk of being attacked. We recommend increased communication between stakeholders to establish ground rules for media reporting of shark-human conflicts, better informed reporting of attacks, further research undertaken to understand the public's perception of media reporting of conflicts and continued investment in communication, education, and public awareness programs. Through these actions it will be possible to rebalance the public perception of sharks to promote understanding and value of their ecological role and to minimize human-shark incidents.
Keywords	Puma concolor ; Ursidae ; developed countries ; education ; human-wildlife relations ; predators ; public opinion ; risk estimate ; sharks ; social networks ; stakeholders
Language	English
Dates of publication	2018-1219
Publishing place	Elsevier Editora Ltda.
Document type	Article
Note	Pre-press version
ISSN	2530-0644
DOI	10.1016/j.pecon.2018.12.004
Database	NAL-Catalogue (AGRICOLA)

Order via subito

Inter-library loan at ZB MED

Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

Article: Ecological role and historical trends of large pelagic predators in a subtropical marine ecosystem of the South Atlantic

Bornatowski, Hugo / Ronaldo Angelini / Marta Coll / Rodrigo R. P. Barreto / Alberto F. Amorim

Reviews in fish biology and fisheries. 2018 Mar., v. 28, no. 1

2018

Abstract: Large pelagic predators occupy high positions in food webs and could control lower trophic level species by direct and indirect ecological interactions. In this study we aimed to test the hypotheses: (1) pelagic predators are keystone species, and their ... ...

Abstract	Large pelagic predators occupy high positions in food webs and could control lower trophic level species by direct and indirect ecological interactions. In this study we aimed to test the hypotheses: (1) pelagic predators are keystone species, and their removals could trigger impacts on the food chain; (2) higher landings of pelagic predators could trigger fishing impacts with time leading to a drop in the mean trophic level of catches; and (3) recovery in the pelagic predators populations, especially for sharks, could be achieved with fishing effort reduction. We performed a food web approach using an Ecopath with Ecosim model to represent the Southeastern and Southern Brazil, a subtropical marine ecosystem, in 2001. We then calibrated the baseline model using catch and fishing effort time series from 2001 to 2012. Afterwards, we simulated the impact of fishing effort changes on species and assessed the ecological impacts on the pelagic community from 2012 to 2025. Results showed that the model was well fitted to landing data for the majority of groups. The pelagic predators species were classified as keystone species impacting mainly on pelagic community. The ecosystem was resilient and fisheries seem sustainable at that time. However, the temporal simulation, from 2001 to 2012, revealed declines in the biomass of three sharks, tuna and billfish groups. It was possible observe declines in the mean trophic level of the catch and in the mean total length of landings. Longline fisheries particularly affected the sharks, billfish and swordfish, while hammerhead sharks were mostly impacted by gillnet fishery. Model simulations showed that large sharks’ biomasses could be recovered or maintained only after strong fishing effort reduction.
Keywords	Sphyrnidae ; Xiphias gladius ; biomass ; environmental impact ; food chain ; gillnets ; keystone species ; longline fisheries ; marine ecosystems ; predators ; sharks ; simulation models ; time series analysis ; trophic levels ; tuna ; Brazil
Language	English
Dates of publication	2018-03
Size	p. 241-259.
Publishing place	Springer International Publishing
Document type	Article
ZDB-ID	1498719-3
ISSN	1573-5184 ; 0960-3166
ISSN (online)	1573-5184
ISSN	0960-3166
DOI	10.1007/s11160-017-9492-z
Database	NAL-Catalogue (AGRICOLA)

Order via subito

Article: Topological redundancy and âsmallâworldâ patterns in a food web in a subtropical ecosystem of Brazil

Bornatowski, Hugo / Rodrigo Barreto / AndrÃ©s F. Navia / Alberto Ferreira de Amorim

Marine ecology. 2017 Apr., v. 38, no. 2

2017

Abstract: According to graph theory, the frequency distribution of trophic interactions within a food web has deep structural implications, as it can highlight the presence of patterns associated with the web and indicate whether the properties of the web are ... ...

Abstract	According to graph theory, the frequency distribution of trophic interactions within a food web has deep structural implications, as it can highlight the presence of patterns associated with the web and indicate whether the properties of the web are independent of its size. A hypothesis is that âsmallâworldâ food webs are sensitive to the loss of species with the highest values. Therefore, the present work aimed to evaluate the degree to which a subtropical food web in Southern Brazil displays smallâworld patterns and their resistance. As part of the assessment, we evaluated the topological redundancy values of species in the food web and then we simulated the exclusion of these species (such as sharks and sea birds), and also the exclusion of high centrality species (such as squids Loligo sp., portunid swimming crabs and the cutlassfish Trichiurus lepturus). The food web showed a âbroadâscaleâ distribution of connections by node, and a smallâworld pattern. As expected, a simplification of the network was observed after elimination of some species with high centrality. However, the food web was resistant to the loss of species with low topological redundancy, probably because these species occupy a high trophic level and do not participate in lots of routes within the food web. We highlight however, the importance of the application of multiple analyses to evaluate the importance of components in food webs, and fisheries management plans should consider both species of high centrality values and species with low topological redundancy.
Keywords	Loligo ; Portunidae ; Trichiurus lepturus ; ecosystems ; fisheries management ; frequency distribution ; mathematical theory ; seabirds ; sharks ; squid ; topology ; trophic levels ; Brazil
Language	English
Dates of publication	2017-04
Size	p. .
Publishing place	John Wiley & Sons, Ltd
Document type	Article
Note	JOURNAL ARTICLE
ZDB-ID	2020745-1
ISSN	1439-0485 ; 0173-9565
ISSN (online)	1439-0485
ISSN	0173-9565
DOI	10.1111/maec.12407
Database	NAL-Catalogue (AGRICOLA)

Order via subito

Article ; Online: Macro-debris ingestion and entanglement by blue sharks (Prionace glauca Linnaeus, 1758) in the temperate South Atlantic Ocean.

Barreto, Rodrigo / Bornatowski, Hugo / Fiedler, Fernando N / Pontalti, Monica / da Costa, Ketyllen J / Nascimento, Caiame / Kotas, Jorge E

Marine pollution bulletin

2019 Volume 145, Page(s) 214–218

Language	English
Publishing date	2019-05-25
Publishing country	England
Document type	Journal Article
ZDB-ID	2001296-2
ISSN	1879-3363 ; 0025-326X
ISSN (online)	1879-3363
ISSN	0025-326X
DOI	10.1016/j.marpolbul.2019.05.025
Database	MEDical Literature Analysis and Retrieval System OnLINE

Order via subito

Article ; Online: Shark mislabeling threatens biodiversity.

Bornatowski, Hugo / Braga, Raul Rennó / Vitule, Jean Ricardo Simões

Science (New York, N.Y.)

2013 Volume 340, Issue 6135, Page(s) 923

MeSH term(s)	Animals ; Biodiversity ; Brazil ; Conservation of Natural Resources ; Fish Products/economics ; Food Labeling/legislation & jurisprudence ; Sharks
Language	English
Publishing date	2013-05-24
Publishing country	United States
Document type	Letter
ZDB-ID	128410-1
ISSN	1095-9203 ; 0036-8075
ISSN (online)	1095-9203
ISSN	0036-8075
DOI	10.1126/science.340.6135.923-a
Database	MEDical Literature Analysis and Retrieval System OnLINE

In stock of ZB MED Cologne/Königswinter

Zs.A 27: Show issues			Location: Je nach Verfügbarkeit (siehe Angabe bei Bestand) bis Jg. 1994: Bestellungen von Artikeln über das Online-Bestellformular Jg. 1995 - 2021: Lesesall (1.OG) ab Jg. 2022: Lesesaal (EG)
Zs.MG 77: Show issues

Order via subito

Details ▾
- See ZB MED holdings
- Order with fees

Article: Societal perception, impacts and judgment values about invasive freshwater stingrays

dos Santos, Daniel Alves / Bornatowski, Hugo / de Paiva Affonso, Igor / Gomes, Luiz Carlos / Message, Hugo José / Okada, Edson Kyioshi / Vitule, Jean Ricardo Simões

Biological invasions. 2019 Dec., v. 21, no. 12

2019

Abstract: We currently face a unique phase in the global biodiversity crisis because of massive introductions of non-native species into greatly altered ecosystems. These introductions frequently occur as a consequence of human constructions and structures such as ...

Abstract	We currently face a unique phase in the global biodiversity crisis because of massive introductions of non-native species into greatly altered ecosystems. These introductions frequently occur as a consequence of human constructions and structures such as dams that allow species to overcome historic established biogeographic barriers. There is a pressing need for study the socio-economic influence of invasive populations. Here we assessed the effects of one of the largest invasion events of elasmobranchs in the world. We investigated socio-economic impacts caused by invasive populations of freshwater stingrays in the upper Paraná River ecoregion (Brazil) using questionnaires to survey 125 artisanal fishers. The two study species are not tradable, may damage gear and cause accidents directly linked with their presence in the ecosystem, so are associated with economic losses for fishers. Thus, the local population perceives stingrays as a bycatch with strong negative socio-economic outcomes. Our results indicate that large-scale invasions triggered by enterprises (e.g. dams) can misguide conservation policies and management and cause multilevel damages to human well-being, especially if local information and local perception are not taken into account. The assessment of social perception demonstrated that invasive stingrays are not welcome or beneficial for the traditional resident human population.
Keywords	accidents ; biodiversity ; business enterprises ; bycatch ; ecological invasion ; ecoregions ; ecosystems ; financial economics ; freshwater ; geographical distribution ; human population ; humans ; introduced species ; invasive species ; issues and policy ; Myliobatiformes ; questionnaires ; rivers ; social welfare ; socioeconomic factors ; surveys ; traditional technology ; Brazil ; Parana River
Language	English
Dates of publication	2019-12
Size	p. 3593-3606.
Publishing place	Springer International Publishing
Document type	Article
ZDB-ID	1438729-3
ISSN	1573-1464 ; 1387-3547
ISSN (online)	1573-1464
ISSN	1387-3547
DOI	10.1007/s10530-019-02071-0
Database	NAL-Catalogue (AGRICOLA)

In stock of ZB MED Bonn / Germany

Z 7608: Show issues

Order via subito

Inter-library loan at ZB MED

Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

Details ▾
- See ZB MED holdings
- Order with fees

Article ; Online: In response to "Attack upon a bather by a swordfish".

Bornatowski, Hugo / Corrêa, Marco F M / Abilhoa, Vinícius

Wilderness & environmental medicine

2011 Volume 22, Issue 3, Page(s) 285–6; author reply 286

MeSH term(s)	Animals ; Behavior, Animal ; Humans ; Male ; Perciformes ; Wounds and Injuries/pathology
Language	English
Publishing date	2011-09
Publishing country	United States
Document type	Comment ; Letter
ZDB-ID	1238909-2
ISSN	1545-1534 ; 1080-6032
ISSN (online)	1545-1534
ISSN	1080-6032
DOI	10.1016/j.wem.2011.04.006
Database	MEDical Literature Analysis and Retrieval System OnLINE

In stock of ZB MED Cologne/Königswinter

Zs.A 3025: Show issues

Location:
Je nach Verfügbarkeit (siehe Angabe bei Bestand)
bis Jg. 1994: Bestellungen von Artikeln über das Online-Bestellformular
Jg. 1995 - 2021: Lesesall (2.OG)
ab Jg. 2022: Lesesaal (EG)

Order via subito

Details ▾
- See ZB MED holdings
- Order with fees

To top

More links

Kategorien

In stock of ZB MED Bonn / Germany

Order via subito

Inter-library loan at ZB MED

More links

Kategorien

Order via subito

Inter-library loan at ZB MED

More links

Kategorien

In stock of ZB MED Bonn / Germany

Order via subito

Inter-library loan at ZB MED

More links

Kategorien

Order via subito

Inter-library loan at ZB MED

More links

Kategorien

Order via subito

More links

Kategorien

Order via subito

More links

Kategorien

Order via subito

More links

Kategorien

In stock of ZB MED Cologne/Königswinter

Order via subito

More links

Kategorien

In stock of ZB MED Bonn / Germany

Order via subito

Inter-library loan at ZB MED

More links

Kategorien

In stock of ZB MED Cologne/Königswinter

Order via subito