Maria João Ivens Collares Pereira

Past Publications

All Publications Before 2015

INTERNATIONAL PEER REVIEWED PAPERS (IN JOURNALS WITH IMPACT FACTOR)

72) PEREIRA, C.S., ABOIM, M.A., RAB, P. & COLLARES-PEREIRA, M.J. 2014. Introgressive hybridization as a promoter of genome reshuffling in natural homoploid fish hybrids (Cyprinidae, Leuciscinae). Heredity, 112: 343-350. (IF=3,805)

71) REIS, J., COLLARES-PEREIRA, M.J. & ARAUJO R. 2014. Host specificity and metamorphosis of the glochidium of the freshwater mussel Unio tumidiformis (Bivalvia: Unionidae). Folia Parasitologica, 61(1): 81-89. (IF=1,147)

70) COLLARES-PEREIRA, M.J., MATOS, I., MORGADO-SANTOS, M. & COELHO, M.M. 2013. Natural Pathways towards Polyploidy in Animals: The Squalius alburnoides fish complex as a model system to study genome size and genome reorganization in polyploids. Cytogenetic and Genome Research, 140(2-4): 97-116. (IF=1.905)

69) PEREIRA, C.S., RÁB, P. & COLLARES-PEREIRA, M.J. 2013. Chromosomes of Iberian Leuciscinae (Cyprinidae) revisited: Evidence of genome restructuring in homoploid hybrids using dual-color FISH and CGH. Cytogenetic and Genome Research, 141(2-3): 143-152. (IF=1.905)

68) RIBEIRO, F.V., MAGALHÃES, M.F. & COLLARES-PEREIRA, M.J. 2013. Spatial and temporal variation in assemblage structure of fish larvae in mediterranean–type streams: contrasts between native and non-native species. Environmental Biology of Fishes, 96(4): 467-480. (IF=1.305)

67) NABAIS, C., RAMPIN, M. & COLLARES-PEREIRA, M.J. 2013. Comparative cytogenetics of two endangered leuciscine fish, Squalius aradensis and S. torgalensis (Teleostei, Cyprinidae) from the Iberian Peninsula. Comparative Cytogenetics, 7(1): 33-42. (IF=0.755)

66) NABAIS, C., PEREIRA, C.S., CUNADO, N. & COLLARES-PEREIRA, M.J. 2012. Synaptonemal complexes in the hybridogenetic Squalius alburnoides fish complex: new insights on the gametogenesis of allopolyploids. Cytogenetic and Genome Research, 138(1): 31-35. (IF=1.839)

65) PEREIRA, C.S., RÁB, P. & COLLARES-PEREIRA, M.J. 2012. Chromosomes of European cyprinid fishes: comparative cytogenetics and chromosomal characteristics of ribosomal DNAs in nine Iberian chondrostomine species (Leuciscinae). Genetica, 140(10-12): 485-495. (IF=1.681)

64) RAMPIN, M., BI, K., BOGART, J. & COLLARES-PEREIRA, M.J. 2012. Identifying parental chromosomes and genomic rearrangements in animal hybrid complexes of species with small genome size using Genomic In Situ Hybridization (GISH). Comparative Cytogenetics, 6(3): 287-300. (IF=0.755)

63) KJÖLLERSTRÖM, H.J., COLLARES-PEREIRA, M.J. & OOM M.M. 2011. First evidence of sex chromosome mosaicism in the endangered Sorraia Horse breed. Livestock Science, 136(2-3): 273-276. (IF=1.506)

62) NETO, A., SILVA, M., MATOSO, D.A., VICARI, M.R., ALMEIDA, M.C., COLLARES-PEREIRA, M.J. & ARTONI, R.F. 2011. Karyotype variability in neotropical catfishes of the family Pimelodidae (Teleostei: Silutiformes). Neotropical Ichtyology, 9(1): 97-105. (IF=1.064)

61) FILIPE, A.F., MAGALHÃES, M.F. & COLLARES-PEREIRA, M.J. 2010. Native and introduced fish species richness in Mediterranean streams: the role of multiple landscape influences. Diversity and Distributions, 16(5): 773-785. (IF=4.248)

60) MATOS, I., MACHADO, M., SUCENA, E., COLLARES-PEREIRA, M.J., SCHARTL M. & COELHO M.M. 2010. Evidence for hermaphroditism in the Squalius alburnoides allopolyploid fish complex. Sexual Development, 4(3): 170-175. (IF=3.052)

59) COLLARES-PEREIRA, M.J. & COELHO, M.M. 2010. Reconfirming the hybrid origin and generic status of the Iberian cyprinid complex Squalius alburnoides. Journal of Fish Biology, 76(3): 707-715. (IF=1.330)

58) PIRES, D.F., PIRES, A.M., COLLARES-PEREIRA, M.J. & MAGALHÃES M.F. 2010. Variation in fish assemblages across dry-season pools in a Mediterranean stream: effects of pool morphology, physicochemical factors and spatial context. Ecology of Freshwater Fish, 19(1): 74-86. (IF=1.432)

57) MORGADO-SANTOS, M., MATOS, I., VICENTE, L. & COLLARES-PEREIRA, M.J. 2010. Scaleprinting: individual identification based on scale patterns. Journal of Fish Biology, 76(5): 1228-1232. (IF=1.330)

56) RIBEIRO, F. & COLLARES-PEREIRA, M.J. 2010. Life-history variability of non-native centrarchids in regulated river systems in the Lower Guadiana drainage (Southwest Iberian Peninsula). Journal of Fish Biology 76(3): 522-527. (IF=1.330)

55) OOM, M.M., SILVA, R., KJOLLERSTROM, J., RAMPIN, M., FERNANDES, C., PAS, A., VERCAMMEN, P., MARQUES PEREIRA, N., SANTOS-REIS, M. & COLLARES-PEREIRA, M.J. 2010. Chromosome differentiation in the two non-African isolates of Genetta genetta. Chromosome Research, 18: 726 (abstract).

54) PEREIRA, C.S., COLLARES-PEREIRA, M.J. & RAB, P. 2010. Revisiting the karyotypes of some Iberian nases by distinct FISH approaches: what is new? Chromosome Research, 18: 751 (abstract).

53) RAMPIN, M., BI, K., BOGART, J. & COLLARES-PEREIRA, M.J. 2010. Identification of putative chromosomal exchanges in S.alburnoides non-sexual fish complex by genomic in situ hybridization (GISH): a confirmation of preliminary results. Chromosome Research, 18: 752-753 (abstract).

52) FILIPE, A.F., ARAÚJO, M.B., DOADRIO, I., ANGERMEIER, P. & COLLARES-PEREIRA, M.J. 2009. Biogeography of Iberian freshwater fishes revisited: the roles of historical versus contemporary constraints. Journal of Biogeography, 36(11): 2096-2110. (IF=4.087)

51) MONTEIRO, R., CARVALHO, C. & COLLARES-PEREIRA, M.J. 2009. Karyotype and genome size of Iberochondrostoma almacai (Teleostei, Cyprinidae) and comparison with the sister-species I. lusitanicum. Genetics and Molecular Biology, 32(2): 268-275. (IF=0.583)

50) PEREIRA, C.S., NETO, A. & COLLARES-PEREIRA, M.J. 2009. Cytogenetic survey of species of two distinct genera of Iberian nases (Cyprinidae, Leuciscinae) that hybridize extensively in nature. I. Evidence of a similar and conserved chromosome pattern with some few species-specific markers at macro-structural level. Genetica, 137(3): 285–291. (IF=2.092)

49) LEUNDA, P., ELVIRA, B., RIBEIRO, F., MIRANDA, R., OSCOZ, J., ALVES, M.J. & COLLARES-PEREIRA, M.J. 2009. International standardization of common names for iberian endemic freshwater fishes. Limnetica, 28(2): 189-202.

48) RIBEIRO, F., COLLARES-PEREIRA, M.J. & MOYLE, P. 2009. Non-native fish in the fresh waters of Portugal, Azores and Madeira Islands: a growing threat to aquatic biodiversity. Fisheries Management and Ecology, 16(4): 255-264. (IF=1.264)

47) MAGALHÃES, M.F., RAMALHO, C.E. & COLLARES-PEREIRA, M.J. 2008. Assessing biotic integrity in Mediterranean streams: development and evaluation of a multimetric fish index. Fisheries Management and Ecology, 15(4): 273-289. (IF=1.404)

46) Pereira, C.S., Neto, A., Rab, P., Rabova, M. & Collares-Pereira, M.J. 2008. Evidence of high levels of polymophism in NOR-phenotypes of Iberian nases (Teleostei Cyprinidae) in hybrid zones caused by massive introgression processes. Chromosome Research, 16(7): 1062. (IF=3.405) (abstract)

45)  RAB, P., RABOVA, M., PEREIRA, C.S., COLLARES-PEREIRA, M.J. & PELIKANOVA, S. 2008. Chromosome studies of European cyprinid fishes: interspecific homology of leuciscine cytotaxonomic marker-the largest subtelocentric chromosome pair as revealed by cross-species painting. Chromosome Research, 16(6): 863-873. (IF=3.405)

44) RIBEIRO, F., ELVIRA, B., COLLARES-PEREIRA, M.J. & MOYLE, P.B. 2008. Life-history traits of non-native fishes in Iberian watersheds across several invasion stages: a first approach. Biological Invasions, 10(1): 89-102. (IF=2.788)

43) SOUSA, V., PENHA, F., COLLARES-PEREIRA, M.J., CHIKHI, L. & COELHO, M.M. 2008. Genetic structure and signature of population decrease in the critically endangered freshwater cyprinid Chondrostoma lusitanicum. Conservation Genetics, 9(4): 791-805. (IF=2.408)

42) MAGALHÃES, M.F., BEJA, P., SCHLOSSER, I.J. & COLLARES-PEREIRA, M.J. 2007. Effects of multi-year droughts on fish assemblages of seasonally drying Mediterranean streams. Freshwater Biology, 52(8): 1494-1510. (IF=2.650)

41) RIBEIRO, F., ORJUELA, R.L., MAGALHÃES, M.F. & COLLARES-PEREIRA, M.J. 2007. Variability in feeding ecology of a South American cichlid: a reason for successful invasion in mediterranean-type rivers? Ecology of Freshwater Fish, 16(4): 559–569. (IF=1.206)

40) SOUSA-SANTOS, C., COLLARES-PEREIRA, M.J. & ALMADA, V.C. 2007. Fertile triploid males – An uncommon case among hybrid vertebrates. Journal of Experimental Zoology Part A-Ecological Genetics and Physiology, 307(4): 220-225. (IF=1.549)

39) SOUSA-SANTOS, C., COLLARES-PEREIRA, M.J. & ALMADA, V.C. 2007. Reading the history of a hybrid fish complex from its molecular record. Molecular Phylogenetics and Evolution, 45(3): 981-996. (IF=3.871)

38) GROMICHO, M, COUTANCEAU, J-P, OZOUF-COSTAZ, C & COLLARES-PEREIRA, M.J. 2006. Contrast between extensive variation of 28S rDNA and stability of 5S rDNA and telomeric repeats in the diploid-polyploid Squalius alburnoides complex and in its maternal ancestor Squalius pyrenaicus (Teleostei, Cyprinidae). Chromosome Research, 14: 297-306.

37) SOUSA-SANTOS, C., COLLARES-PEREIRA, M.J. & ALMADA, V. 2006. Reproductive success of nuclear nonhybrid males of Squalius alburnoides hybridogenetic complex (Teleostei, Cyprinidae): an example of interplay between female choice and ecological pressures?Acta Ethologica, 9: 31-36.

36) SOUSA-SANTOS, C., COLLARES-PEREIRA, M.J. & ALMADA, V. 2006. Evidence of extensive mitochondrial introgression with nearly complete substitution of the typical Squalius pyrenaicus-like mtDNA of the Squalius alburnoides complex (Cyprinidae) in an independent Iberian drainage. J. Fish Biology, 68b: 292-301.

35)  GROMICHO, M., COELHO, M.M., ALVES, M.J. & COLLARES-PEREIRA, M.J. 2006. Cytogenetic analysis of Anaecypris hispanica and its relationship with the paternal ancestor of the diploid-polyploid Squalius alburnoides complex. Genome, 49: 1621-1627.

34) SOUSA-SANTOS, C., COLLARES-PEREIRA, M.J. & ALMADA, V.C. 2006. May a hybridogenetic complex regenerate the nuclear genome of both sexes of a missing ancestor? - First evidence on the occurrence of a nuclear nonhybrid Squalius alburnoides (Cyprinidae) female based on DNA sequencing. Journal of Natural History, 40(23-24): 1443-1448.

33) GOMES-FERREIRA, A., RIBEIRO, F., MOREIRA DA COSTA, L., COWX, I.G. & COLLARES-PEREIRA, M.J. 2005. Variability in diet and foraging behaviour between sexes and ploidy forms of the hybridogenetic Squalius alburnoides complex (Cyprinidae) in the Guadiana River basin, Portugal. J. Fish Biology, 66: 454-467.

32) COELHO, M.M., MESQUITA, M. & COLLARES-PEREIRA, M.J. 2005. Chondrostoma almacai, a new cyprinid species from the southwest of Portugal, Iberian Peninsula. Folia Zoologica, 54(1-2): 201-212.

31) GROMICHO, M., OZOUF-COSTAZ, C. & COLLARES-PEREIRA, M.J. 2005. Lack of correspondence between CMA3, Ag-positive signals and 28S rDNA loci in two Iberian minnows (Teleostei, Cyrinidae) evidenced by sequential banding. Cytogenet. Genome Res., 109: 507-511.

30) PROENÇA, S., COLLARES-PEREIRA, M.J. & SERRANO, A.R.M. 2005. Chromosome evolution in tiger beetles: karyotypes and localization of 18S rDNA loci in Neotropical Megacephalini (Coleotpera, Cicindelidae). Genetics and Molecular Biology, 28(4): 725-733.

29) PROENÇA, S., COLLARES-PEREIRA, M.J. & SERRANO, A.R.M. 2005. New contributions to the cytotaxonomy of tiger beetles (Coleoptera, Cicindelidae) from the Afrotropical Region: cytogenetic characterization of Prothyma concinna, Elliptica lugubris and Ropaloteres cinctus. Caryologia, 58(1): 56-61.

28) SOUSA-SANTOS, C., ROBALO, J.I., COLLARES-PEREIRA, M.J. & ALMADA, V.C. 2005. Heterozygous indels as useful tools in the reconstruction of DNA sequences and in the assessment of ploidy level and genomic constitution of hybrid organisms. DNA Sequence, 16(6): 462-467.

27) COLLARES-PEREIRA M.J., MAGALHAES M.F., PIRES A.M., PIRES D., RODRIGUES P., PENHA F., SOUSA G., MESQUITA N. & COELHO M.M. 2005. An integrated approach to fish assemblage conservation in a Mediterranean stream under a damming process: what future for the highly endangered species? Journal of Fish Biology, 67 (Supp. B): 280-281. (abstract)

26) FILIPE, A.F., MARQUES, T., SEABRA, S., TIAGO, P., RIBEIRO, F., MOREIRA DA COSTA, L., COWX, I.G. & COLLARES-PEREIRA, M.J. 2004. Selection of priority areas for fish conservation in Guadiana River Basin, Iberian Peninsula. Conservation Biology, 18(1): 189-200.

25) COLLARES-PEREIRA, M.J. & COWX, I.G. 2004. The role of catchment scale environmental management in freshwater fish conservation. Fisheries Management and Ecology, 11: 303-312.

24) ALVES, M.J., GROMICHO M., COLLARES-PEREIRA M.J., CRESPO-LOPEZ E. & COELHO M.M. 2004. Simultaneous production of triploid and haploid eggs by triploid Squalius alburnoides (Teleostei: Cyprinidae). Journal of Experimental Zoology, 301A: 552-558.

23) GROMICHO, M. & COLLARES-PEREIRA, M.J. 2004. Polymorphism of major ribosomal gene chromosomal sites (NOR-phenotypes) in the hybridogenetic fish Squalius alburnoides complex (Cyprinidae) assessed through crossing experiments. Genetica, 122: 291-302.

22) GROMICHO, M., OZOUF-COSTAZ, C. & COLLARES-PEREIRA, M.J. 2004. Molecular versus classical cytogenetic data on the Squalius alburnoides complex (Teleostei, Cyprinidae): what is new? Cytogenetic and Genome Research, 106: 16 (abstract).

21) PROENÇA S.J.R., COLLARES-PEREIRA M.J. & SERRANO, A.R.M. 2004. Cytogenetic variability in three species of the genus Cicindela (s.l.) (Coleoptera, Cicindelidae): karyotypes and localization of 18S rDNA genes. Genetics and Molecular Biology, 27(4): 555-560.

20) GANTE, H.F., COLLARES-PEREIRA, M.J. & COELHO, M.M. 2004. Introgressive hybridisation between two Iberian Chondrostoma species (Teleostei, Cyprinidae) revisited: new evidence from morphology, mitochondrial DNA, allozymes and NORs-phenotypes. Folia Zoologica, 5 (4): 423-432.

19) MAGALHÃES, M.F., SCHLOSSER, I.J. & COLLARES-PEREIRA, M.J. 2003. The role of the life history in the relationship between population dynamics and environmental variability in two Mediterranean stream fishes. Journal of Fish Biology, 63: 300-317.

18) RIBEIRO, F., COWX, I.G., TIAGO, P., FILIPE, A.F., MOREIRA DA COSTA, L. & COLLARES-PEREIRA, M.J. 2003. Growth and reproductive traits of diploid and triploid forms of the Squalius alburnoides cyprinid complex in a tributary of the Guadiana River, Portugal. Archiv für Hydrobiology, 156: 471-484.

17) SALGUEIRO, P., CARVALHO, G., COLLARES-PEREIRA, M.J. & Coelho, M.M. 2003. Microsatellite analysis of genetic population structure of the endangered cyprinid Anaecypris hispanica in Portugal: implications for conservation. Biological Conservation, 109: 47-56.

16) ALVES, M.J., COLLARES-PEREIRA, M.J., DOWLING, M.J. & COELHO, M.M. 2002. The genetics of maintenance of an all-male lineage in the Squalius alburnoides complex. J. Fish Biology, 60: 649-662.

15)  FILIPE, A.F., COWX, I.G. & COLLARES-PEREIRA, M.J. 2002. Spatial modeling of freshwater fish in semi-arid river systems: a tool for conservation. River Research and Applications (formerly Regulated Rivers Ecology and Management), 18: 126-136.

14) PROENÇA, S.R., SERRANO, A.R.M. & COLLARES-PEREIRA, M.J. 2002. Cytogenetic variability in the genus Odontocheila (Coleoptera, Cicindelidae): karyotypes, C-banding, NORs and localization of ribosomal genes of O. confusa and O. nodicornis. Genetica, 114: 237-245.

13) MAGALHÃES, M.F., BEJA, P., CANAS, C. & COLLARES-PEREIRA, M.J. 2002. Functional heterogeneity of dry-season refugia across a Mediterranean catchment: the role of habitat and predation. Freshwater Biology, 47: 1919-1934.

12) MAGALHÃES, M.F., BATALHA, D.C. & COLLARES-PEREIRA, M.J. 2002. Gradients in stream fish assemblages across a Mediterranean landscape: contributions of environmental factors and spatial structure. Freshwater Biology, 47: 1015-1031.

11) PRENDA, J., ARENAS, M.P., FREITAS, D., SANTOS-REIS, m. & COLLARES-PEREIRA, M.J. 2002. Bone length of Iberian freshwater fish, as a predictor of length and biomass of prey consumed by piscivores. Limnetica, 21 (1-2): 15-24.

10) COLLARES-PEREIRA, M.J. & COWX, I.G. 2001. Threatened fishes of the world: Anaecypris hispanica (Steindachner, 1866). Environmental Biology of Fishes, 60: 410.

9) MARTA, P., BOCHECHAS, J. & COLLARES-PEREIRA, M.J. 2001. Importance of recreational fisheries in the Guadiana River Basin in Portugal. Fisheries Management and Ecology, 8(4-5): 345-354.

8) COELHO, M.M., PIRES, A.M., COLLARES-PEREIRA, M.J., SOUSA, E.C. & ZALEWSKI, M. 2001. Buffering role of land/water ecotones in the structuring of the fish community of the Sorraia system. Ecohydrology & Hydrology, 1(1-2): 195-202.

7) ALVES, M.J., COELHO, M.M., COLLARES-PEREIRA, M.J. 2001. Evolution in action through hybridisation and polyploidy in an Iberian freshwater fish: a genetic review. Genetica, 111: 375-385.

6)  ALVES, M.J., COELHO, H., COLLARES-PEREIRA, M.J. & COELHO, M.M. 2001. Mitochondrial DNA variation in the highly endangered cyprinid fish Anaecypris hispanica:implications for conservation. Heredity, 87: 463-473.

5) LOPES, P.A., PINHEIRO, T., SANTOS, M.C., MATHIAS, M.L., COLLARES-PEREIRA, M.J. & VIEGAS-CRESPO, a. 2001. Response of antioxidant enzymes in freshwater fish populations (Leuciscus alburnoides complex) to inorganic pollutants exposure. The Science of the Total Environment, 280: 153-163.

4) PROENÇA, S.R., SERRANO, A.R.M. & COLLARES-PEREIRA, M.J. 2002. An unusual karyotype with low chromosome number in Megacephalini, a basal group of tiger beetles (Coleoptera, Cicindelidae): cytogenetic characterisation by C-banding and location of rDNA genes. Hereditas, 137: 202-207.

3) COLLARES-PEREIRA, M.J., COWX, I.G., RIBEIRO, F., RODRIGUES, J.A. & ROGADO, L. 2000. Threats imposed by water development schemes on the conservation of endangered fish species in the Guadiana River Basin in Portugal. Fisheries Management and Ecology, 7: 1-12.

2) PRÓSPERO, M.J. & COLLARES-PEREIRA, M.J. 2000. Nuclear DNA content variation in the diploid-polyploid Leuciscus alburnoides complex (Teleostei, Cyprinidae) assessed by flow cytometry. Folia Zoologica, 49(1): 53-58.

1) RIBEIRO, F.M., COWX, I.G. & COLLARES-PEREIRA, M.J. 2000. Life history traits of the endangered Iberian cyprinid Anaecypris hispanica and their implications for conservation. Archiv. fur. Hydrobiologia, 149: 569-586.

BOOKS (Editor)

1) COLLARES-PEREIRA, M.J., COWX, I.G. & COELHO, M.M. 2002. Conservation of Freshwater Fishes: Options for the Future. Fishing News Books, Blackwell Science, Oxford, 462 pp.

BOOKS (Author)

1) COLLARES-PEREIRA, M.J., FILIPE, A.F. & MOREIRA DA COSTA, L. 2008. Os Peixes do Guadiana – que futuro? Guia de Peixes do Guadiana Português. Edições Cosmos, Alpiarça, 296p.

BOOKS (Chapters)

6) COLLARES-PEREIRA, M.J. 2014. Prefácio In Cardoso A.C., Carrapato C., Farinha J.C., Rita P. & Silva E.P. Plano de Ação do Saramugo (Anaecypris hispanica), 2012-2016, ICNF & Somincor, Mertola, p.8

5) GROMICHO, M. & COLLARES-PEREIRA, M.J. 2007. The evolutionary role of hybridization and polyploidy in an Iberian cyprinid fish – a cytogenetic review. pp. 41-67. In: Fish Cytogenetics Eds: E Pisano, C Ozouf-Costaz, F Foresti & BG Kapoor. Science Publishers, Enfield, NH, USA. 

4) COELHO, M.M., SALGUEIRO, P., ALVES, M.J. & COLLARES-PEREIRA, M.J. 2002. Contribution of molecular markers to management options for the conservation of Anaecypris hispanica. pp. 331-336. In M.J. Collares-Pereira, I.G. Cowx & M.M. Coelho (editors), Conservation of Freshwater Fishes: Options for the Future. Fishing News Books, Blackwell Science, Oxford.

3) COLLARES-PEREIRA, M.J., COWX, I.G., RODRIGUES, J.A & ROGADO, L. 2002. The conservation strategy for Anaecypris hispanica: a picture of LIFE for a highly endangered Iberian fish. pp. 186-197. In M.J. Collares-Pereira, I.G. Cowx & M.M. Coelho (editors), Conservation of Freshwater Fishes: Options for the Future. Fishing News Books, Blackwell Science, Oxford.

2) COWX, I.G. & COLLARES-PEREIRA, M.J. 2002. Freshwater fish conservation: options for the future. pp. 443-452. In M.J. Collares-Pereira, I.G. Cowx & M.M. Coelho (editors), Conservation of Freshwater Fishes: Options for the Future. Fishing News Books, Blackwell Science, Oxford.

1) COWX, I.G. & COLLARES-PEREIRA, M.J. 2000. Conservation of endangered fish species in the face of water resource development schemes in the Guadiana River, Portugal: harmony of the incompatible. pp. 428-438. In Management and Ecology of River Fisheries. Ed. I.G. Cowx, Fishing News Books, Blackwell Science, Oxford.