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Gandra M, Winkler AC, Afonso P, Abecasis D. Long-distance migrations and seasonal movements of meagre (Argyrosomus regius), a large coastal predator, along the Iberian Peninsula coast. Mov Ecol 2024; 12:35. [PMID: 38725044 PMCID: PMC11080147 DOI: 10.1186/s40462-024-00469-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/15/2023] [Accepted: 04/06/2024] [Indexed: 05/12/2024]
Abstract
BACKGROUND The meagre, Argyrosomus regius, is a large coastal predatory fish inhabiting waters from the north-eastern Atlantic and Mediterranean Sea, where it is targeted by commercial and recreational fisheries. Previous genetic studies have found an unexpectedly high population differentiation not only between the Atlantic and the Mediterranean, but also along the Atlantic coast. However, the reasons underpinning this genetic barrier remained unclear. Likewise, even though the species is amongst the world's largest marine teleosts, knowledge about its movement ecology and migratory behaviour remains notably scarce, and primarily reliant on fisheries-dependent data. METHODS In this study, we used a combination of acoustic telemetry and pop-up satellite archival tags to investigate the movements of 22 adult meagre (70-143 cm total length) along the Southwestern coast of the Iberian Peninsula. RESULTS Our results strongly suggest that the previously reported genetic differentiation is not maintained by limited adult dispersal/movement, as hypothesized. On the contrary, we documented some of the longest individual annual migrations ever recorded for a coastal teleost, up to > 2000 km, with frequent back-and-forth movements between the West and Southern Iberian coasts. Moreover, their detected regional movement patterns support the existence of a marked seasonal behavioural shift, with individuals being less active and moving to deeper waters during winter, and are consistent with spawning philopatry associated to their summer reproductive movements. Finally, we identified putative aggregation areas that may harbour important feeding/overwintering grounds. CONCLUSIONS These findings shed new light on the movement and behaviour patterns of meagre that may be of particular importance for the conservation and spatial management of this species throughout its range, and open the door to further research on functional connectivity.
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Affiliation(s)
- Miguel Gandra
- Centre of Marine Sciences (CCMAR), University of the Algarve, Faro, Portugal.
| | - Alexander C Winkler
- Centre of Marine Sciences (CCMAR), University of the Algarve, Faro, Portugal
- Department of Ichthyology and Fisheries Science, Rhodes University, Makhanda, South Africa
| | - Pedro Afonso
- Institute of Marine Sciences - OKEANOS, University of the Azores, Horta, Portugal
- Institute of Marine Research - IMAR, University of the Azores, Horta, Portugal
| | - David Abecasis
- Centre of Marine Sciences (CCMAR), University of the Algarve, Faro, Portugal
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Abecasis D, Ogden R, Winkler AC, Gandra M, Khallahi B, Diallo M, Cabrera-Castro R, Weiller Y, Erzini K, Afonso P, Assis J. Multidisciplinary estimates of connectivity and population structure suggest the use of multiple units for the conservation and management of meagre, Argyrosomus regius. Sci Rep 2024; 14:873. [PMID: 38195638 PMCID: PMC10776566 DOI: 10.1038/s41598-023-50869-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2023] [Accepted: 12/27/2023] [Indexed: 01/11/2024] Open
Abstract
Information on population structure and connectivity of targeted species is key for proper implementation of spatial conservation measures. We used a combination of genomics, biophysical modelling, and biotelemetry to infer the population structure and connectivity of Atlantic meagre, an important fisheries resource throughout its distribution. Genetic samples from previously identified Atlantic spawning locations (Gironde, Tejo, Guadalquivir, Banc d'Arguin) and two additional regions (Algarve and Senegal) were analysed using genome-wide SNP-genotyping and mitochondrial DNA analyses. Biophysical models were conducted to investigate larval dispersal and connectivity from the known Atlantic spawning locations. Additionally, thirteen fish were double-tagged with biotelemetry transmitters off the Algarve (Portugal) to assess movement patterns and connectivity of adult individuals. This multidisciplinary approach provided a robust overview of meagre population structure and connectivity in the Atlantic. Nuclear SNP-genotyping showed a clear differentiation between the European and African populations, with significant isolation of the few known Atlantic spawning sites. The limited level of connectivity between these subpopulations is potentially driven by adults, capable of wide-ranging movements and connecting sites 500 km apart, as evidenced by tagging studies, whilst larval dispersal inferred by modelling is much more limited (average of 52 km; 95% of connectivity events up to 174 km). Our results show sufficient evidence of population structure, particularly between Africa and Europe but also within Europe, for the meagre to be managed as separate stocks. Additionally, considering the low degree of larvae connectivity, the implementation of marine protected areas in key spawning sites could be crucial towards species sustainability.
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Affiliation(s)
- D Abecasis
- CCMAR, Centre of Marine Sciences, University of Algarve, 8005-139, Faro, Portugal.
| | - R Ogden
- Royal (Dick) School of Veterinary Studies and the Roslin Institute, University of Edinburgh, Easter Bush Campus, Midlothian, EH25 9RG, UK
| | - A C Winkler
- CCMAR, Centre of Marine Sciences, University of Algarve, 8005-139, Faro, Portugal
| | - M Gandra
- CCMAR, Centre of Marine Sciences, University of Algarve, 8005-139, Faro, Portugal
| | - B Khallahi
- Institut Mauritanien de Recherches Océanographiques et des Pêches (IMROP), BP 22, Nouadhibou, Cansado, Mauritania
| | - M Diallo
- Conservation and Research of West African Aquatic Mammals (COREWAM), Dakar, Senegal
| | - R Cabrera-Castro
- Departamento de Biología, Facultad de Ciencias del Mar y Ambientales, Universidad de Cádiz. Campus de Excelencia Internacional del Mar (CEIMAR), Avda. República Saharaui, s/n, Puerto Real, 11510, Cádiz, Spain
- Instituto Universitario de Investigación Marina (INMAR), Campus de Excelencia Internacional del Mar (CEIMAR), Avda. República Saharaui, S/N, Puerto Real, 11510, Cádiz, Spain
| | - Y Weiller
- Parc naturel marin de l'estuaire de La Gironde et de la mer des Pertuis, OFB, 17320, Marennes, France
| | - K Erzini
- CCMAR, Centre of Marine Sciences, University of Algarve, 8005-139, Faro, Portugal
| | - P Afonso
- Ocean Sciences Institute (Okeanos), University of the Azores, 9901-862, Horta, Portugal
- Institute of Marine Research (IMAR), 9901-862, Horta, Portugal
| | - J Assis
- CCMAR, Centre of Marine Sciences, University of Algarve, 8005-139, Faro, Portugal
- Faculty of Bioscience and Aquaculture, Nord Universitet, Bodø, Norway
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Pringle BA, Duncan MI, Winkler AC, Mafwila S, Jagger C, McKeown NJ, Shaw PW, Henriques R, Potts WM. Ocean warming favours a northern Argyrosomus species over its southern congener, whereas preliminary metabolic evidence suggests that hybridization may promote their adaptation. Conserv Physiol 2023; 11:coad026. [PMID: 37179704 PMCID: PMC10170327 DOI: 10.1093/conphys/coad026] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/17/2022] [Revised: 03/21/2023] [Accepted: 04/14/2023] [Indexed: 05/15/2023]
Abstract
Anthropogenic-induced climate change is having profound impacts on aquatic ecosystems, and the resilience of fish populations will be determined by their response to these impacts. The northern Namibian coast is an ocean warming hotspot, with temperatures rising faster than the global average. The rapid warming in Namibia has had considerable impacts on marine fauna, such as the southern extension of the distribution of Argyrosomus coronus from southern Angola into northern Namibian waters, where it now overlaps and hybridizes with the closely related Namibian species, A. inodorus. Understanding how these species (and their hybrids) perform at current and future temperatures is vital to optimize adaptive management for Argyrosomus species. Intermittent flow-through respirometry was used to quantify standard and maximum metabolic rates for Argyrosomus individuals across a range of temperatures. The modelled aerobic scope (AS) of A. inodorus was notably higher at cooler temperatures (12, 15, 18 and 21°C) compared with that of A. coronus, whereas the AS was similar at 24°C. Although only five hybrids were detected and three modelled, their AS was in the upper bounds of the models at 15, 18 and 24°C. These findings suggest that the warming conditions in northern Namibia may increasingly favour A. coronus and promote the poleward movement of the leading edge of their southern distribution. In contrast, the poor aerobic performance of both species at cold temperatures (12°C) suggests that the cold water associated with the permanent Lüderitz Upwelling Cell in the south may constrain both species to central Namibia. This is most concerning for A. inodorus because it may be subjected to a considerable coastal squeeze.
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Affiliation(s)
- Brett A Pringle
- Department of Ichthyology and Fisheries Science, Rhodes University, Makhanda, South Africa
- Advance Africa Management Services, Johannesburg, South Africa
| | - Murray I Duncan
- Department of Ichthyology and Fisheries Science, Rhodes University, Makhanda, South Africa
- South African Institute for Aquatic Biodiversity, Makhanda, South Africa
- University of Seychelles and Blue Economy Research Institute, Anse Royale, Mahe, Seychelles
| | - Alexander C Winkler
- Department of Ichthyology and Fisheries Science, Rhodes University, Makhanda, South Africa
| | - Samuel Mafwila
- Department of Fisheries and Aquatic Sciences, Sam Nujoma Campus, University of Namibia, Henties Bay, Namibia
| | - Charmaine Jagger
- Department of Fisheries and Aquatic Sciences, Sam Nujoma Campus, University of Namibia, Henties Bay, Namibia
- Ministry of Fisheries and Marine Resources, Swakopmund, Namibia
| | - Niall J McKeown
- Institute of Biological, Environmental and Rural Sciences, Aberystwyth University, Aberystwyth, UK
| | - Paul W Shaw
- Institute of Biological, Environmental and Rural Sciences, Aberystwyth University, Aberystwyth, UK
| | - Romina Henriques
- Marine Genomics Group, Department of Biochemistry, Genetics and Microbiology, University of Pretoria, Pretoria, South Africa
| | - Warren M Potts
- Department of Ichthyology and Fisheries Science, Rhodes University, Makhanda, South Africa
- South African Institute for Aquatic Biodiversity, Makhanda, South Africa
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Kraft S, Gandra M, Lennox RJ, Mourier J, Winkler AC, Abecasis D. Residency and space use estimation methods based on passive acoustic telemetry data. Mov Ecol 2023; 11:12. [PMID: 36859381 PMCID: PMC9976422 DOI: 10.1186/s40462-022-00364-z] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/29/2022] [Accepted: 12/26/2022] [Indexed: 06/18/2023]
Abstract
Acoustic telemetry has helped overcome many of the challenges faced when studying the movement ecology of aquatic species, allowing to obtain unprecedented amounts of data. This has made it into one of the most widely used methods nowadays. Many ways to analyse acoustic telemetry data have been made available and deciding on how to analyse the data requires considering the type of research objectives, relevant properties of the data (e.g., resolution, study design, equipment), habits of the study species, researcher experience, among others. To ease this decision process, here we showcase (1) some of the methods used to estimate pseudo-positions and positions from raw acoustic telemetry data, (2) methods to estimate residency and (3) methods to estimate two-dimensional home and occurrence range using geometric or hull-based methods and density-distribution methods, a network-based approach, and three-dimensional methods. We provide examples of some of these were tested using a sample of real data. With this we intend to provide the necessary background for the selection of the method(s) that better fit specific research objectives when using acoustic telemetry.
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Affiliation(s)
- S Kraft
- Center of Marine Sciences (CCMAR), Universidade do Algarve, Faro, Portugal.
| | - M Gandra
- Center of Marine Sciences (CCMAR), Universidade do Algarve, Faro, Portugal
| | - R J Lennox
- Laboratory for Freshwater Ecology and Inland Fisheries at NORCE Norwegian Research Center, Bergen, Norway
- Norwegian Institute for Nature Research (NINA), Trondheim, Norway
| | - J Mourier
- MARBEC, Univ Montpellier, CNRS, Ifremer, IRD, Sète, France
| | - A C Winkler
- Center of Marine Sciences (CCMAR), Universidade do Algarve, Faro, Portugal
- Department of Ichthyology and Fisheries Science, Rhodes University, Makhanda, South Africa
| | - D Abecasis
- Center of Marine Sciences (CCMAR), Universidade do Algarve, Faro, Portugal
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Winkler AC, Butler EC, Attwood CG, Mann BQ, Potts WM. The emergence of marine recreational drone fishing: Regional trends and emerging concerns. Ambio 2022; 51:638-651. [PMID: 34145559 PMCID: PMC8800965 DOI: 10.1007/s13280-021-01578-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/21/2020] [Revised: 02/28/2021] [Accepted: 05/16/2021] [Indexed: 06/12/2023]
Abstract
Online evidence suggests that there has been an increase in interest of using unmanned aerial vehicles or drones during land-based marine recreational fishing. In the absence of reliable monitoring programs, this study used unconventional publicly available online monitoring methodologies to estimate the growing interest, global extent, catch composition and governance of this practice. Results indicated a 357% spike in interest during 2016 primarily in New Zealand, South Africa and Australia. From an ecological perspective, many species targeted by drone fishers are vulnerable to overexploitation, while released fishes may experience heightened stress and mortality. From a social perspective, the ethics of drone fishing are being increasingly questioned by many recreational anglers and we forecast the potential for increased conflict with other beach users. In terms of governance, no resource use legislation specifically directed at recreational drone fishing was found. These findings suggest that drone fishing warrants prioritised research and management consideration.
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Affiliation(s)
- Alexander C. Winkler
- Centro de Ciências do Mar (CCMAR), University of the Algarve, Faro, Portugal
- Department of Ichthyology and Fisheries Science, Rhodes University, Makhanda, South Africa
| | - Edward C. Butler
- Department of Ichthyology and Fisheries Science, Rhodes University, Makhanda, South Africa
| | - Colin G. Attwood
- Biological Sciences Department, University of Cape Town, Cape Town, South Africa
| | - Bruce Q. Mann
- South African Association for Marine Biological Research, Durban, South Africa
| | - Warren M. Potts
- Department of Ichthyology and Fisheries Science, Rhodes University, Makhanda, South Africa
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Muller C, Childs AR, Duncan MI, Skeeles MR, James NC, van der Walt KA, Winkler AC, Potts WM. Implantation, orientation and validation of a commercially produced heart-rate logger for use in a perciform teleost fish. Conserv Physiol 2020; 8:coaa035. [PMID: 32346480 PMCID: PMC7176915 DOI: 10.1093/conphys/coaa035] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/29/2019] [Revised: 03/10/2020] [Accepted: 03/30/2020] [Indexed: 05/04/2023]
Abstract
Quantifying how the heart rate of ectothermic organisms responds to environmental conditions (e.g. water temperature) is important information to quantify their sensitivity to environmental change. Heart rate studies have typically been conducted in lab environments where fish are confined. However, commercially available implantable heart rate biologgers provide the opportunity to study free-swimming fish. Our study aimed to determine the applicability of an implantable device, typically used on fusiform-shaped fish (e.g. salmonids), for a perciform fish where morphology and anatomy prevent ventral incisions normally used on fusiform-shaped fish. We found that ventrolateral incisions allowed placement near the heart, but efficacy of the loggers was sensitive to their orientation and the positioning of the electrodes. Electrocardiogram detection, signal strength and subsequent heart rate readings were strongly influenced by logger orientation with a significant effect on the quality and quantity of heart rate recordings. We provide details on the surgical procedures and orientation to guide future heart rate biologger studies on perciform-shaped fish.
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Affiliation(s)
- Cuen Muller
- Department of Ichthyology and Fisheries Science, Rhodes University, Prince Alfred Street, PO Box 94, Makhanda 6140, South Africa
| | - Amber-Robyn Childs
- Department of Ichthyology and Fisheries Science, Rhodes University, Prince Alfred Street, PO Box 94, Makhanda 6140, South Africa
| | - Murray I Duncan
- Department of Ichthyology and Fisheries Science, Rhodes University, Prince Alfred Street, PO Box 94, Makhanda 6140, South Africa
- South African Institute for Aquatic Biodiversity (SAIAB), Somerset Street, Makhanda 6140, South Africa
| | - Michael R Skeeles
- Department of Ichthyology and Fisheries Science, Rhodes University, Prince Alfred Street, PO Box 94, Makhanda 6140, South Africa
| | - Nicola C James
- South African Institute for Aquatic Biodiversity (SAIAB), Somerset Street, Makhanda 6140, South Africa
| | - Kerry-Ann van der Walt
- Department of Ichthyology and Fisheries Science, Rhodes University, Prince Alfred Street, PO Box 94, Makhanda 6140, South Africa
- South African Institute for Aquatic Biodiversity (SAIAB), Somerset Street, Makhanda 6140, South Africa
| | - Alexander C Winkler
- Department of Ichthyology and Fisheries Science, Rhodes University, Prince Alfred Street, PO Box 94, Makhanda 6140, South Africa
| | - Warren M Potts
- Department of Ichthyology and Fisheries Science, Rhodes University, Prince Alfred Street, PO Box 94, Makhanda 6140, South Africa
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Skeeles MR, Winkler AC, Duncan MI, James NC, van der Walt KA, Potts WM. The use of internal heart rate loggers in determining cardiac breakpoints of fish. J Therm Biol 2020; 89:102524. [DOI: 10.1016/j.jtherbio.2020.102524] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2019] [Revised: 01/13/2020] [Accepted: 01/19/2020] [Indexed: 11/15/2022]
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Gwilliam MP, Winkler AC, Potts WM, Santos CV, Sauer WHH, Shaw PW, McKeown NJ. Integrated genetic and morphological data support eco-evolutionary divergence of Angolan and South African populations of Diplodus hottentotus. J Fish Biol 2018; 92:1163-1176. [PMID: 29492972 DOI: 10.1111/jfb.13582] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/13/2017] [Accepted: 02/07/2018] [Indexed: 06/08/2023]
Abstract
The genus Diplodus presents multiple cases of taxonomic conjecture. Among these the D. cervinus complex was previously described as comprising three subspecies that are now regarded as separate species: Diplodus cervinus, Diplodus hottentotus and Diplodus omanensis. Diplodus hottentotus exhibits a clear break in its distribution around the Benguela Current system, prompting speculation that Angolan and South African populations flanking this area may be isolated and warrant formal taxonomic distinction. This study reports the first integrated genetic [mitochondrial (mt)DNA and nuclear microsatellite] and morphological (morphometric, meristic and colouration) study to assess patterns of divergence between populations in the two regions. High levels of cytonuclear divergence between the populations support a prolonged period of genetic isolation, with the sharing of only one mtDNA haplotype (12 haplotypes were fully sorted between regions) attributed to retention of ancestral polymorphism. Fish from the two regions were significantly differentiated at a number of morphometric (69·5%) and meristic (46%) characters. In addition, Angolan and South African fish exhibited reciprocally diagnostic colouration patterns that were more similar to Mediterranean and Indian Ocean congeners, respectively. Based on the congruent genetic and phenotypic diversity we suggest that the use of hottentotus, whether for full species or subspecies status, should be restricted to South African D. cervinus to reflect their status as a distinct species-like unit, while the relationship between Angolan and Atlantic-Mediterranean D. cervinus will require further demo-genetic analysis. This study highlights the utility of integrated genetic and morphological approaches to assess taxonomic diversity within the biogeographically dynamic Benguela Current region.
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Affiliation(s)
- M P Gwilliam
- Institute of Biological, Environmental and Rural Sciences, Aberystwyth University, Aberystwyth, SY23 3DA, U.K
| | - A C Winkler
- Department of Ichthyology & Fisheries Science, Rhodes University, Grahamstown, South Africa
| | - W M Potts
- Department of Ichthyology & Fisheries Science, Rhodes University, Grahamstown, South Africa
| | - C V Santos
- Faculdade Ciêncas da Universidade Agostinho Neto (FCUAN), Luanda, Angola
| | - W H H Sauer
- Department of Ichthyology & Fisheries Science, Rhodes University, Grahamstown, South Africa
| | - P W Shaw
- Institute of Biological, Environmental and Rural Sciences, Aberystwyth University, Aberystwyth, SY23 3DA, U.K
| | - N J McKeown
- Institute of Biological, Environmental and Rural Sciences, Aberystwyth University, Aberystwyth, SY23 3DA, U.K
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Noh PH, Cooper CS, Winkler AC, Zderic SA, Snyder HM, Canning DA. Prognostic factors for long-term renal function in boys with the prune-belly syndrome. J Urol 1999; 162:1399-401. [PMID: 10492223] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/14/2023]
Abstract
PURPOSE Renal failure develops in 25 to 30% of patients with the prune-belly syndrome. The clinical parameters associated with renal failure in this condition are not well understood. We determined which factors predict renal failure in children with the prune-belly syndrome. MATERIALS AND METHODS We reviewed the records of 35 patients with the prune-belly syndrome who were treated at our hospital during a 37-year period. Nadir serum creatinine, time to nadir creatinine, presence or absence of a patent urachus, presence and severity of urinary tract infection, and renal failure were analyzed. RESULTS Mean followup was 14 years 2 months. In 2 of the 17 patients with a nadir serum creatinine of less than 0.7 mg./dl. renal failure developed. Each of these 2 children also had clinical pyelonephritis and urosepsis. In 12 of the 13 patients nadir serum creatinine greater than 0.7 mg./dl. strongly predicted renal failure. Nonfebrile urinary tract infection within the first year of life was not predictive of outcome (p = 0.8) but a history of clinical pyelonephritis correlated with eventual renal failure (p<0.001). Urosepsis also correlated with renal failure (p = 0.008). Children with at least 1 normal kidney on renal ultrasound or renal scan had a significantly lower chance of renal failure (p<0.001). CONCLUSIONS Bilaterally abnormal kidneys on ultrasound or renal scan, a nadir serum creatinine of greater than 0.7 mg./dl. and clinical pyelonephritis are prognostic for renal failure.
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Affiliation(s)
- P H Noh
- Division of Urology, Children's Hospital of Philadelphia, Pennsylvania, USA
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