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Maria José Lemos Boavida Volumen 31 (2) Diciembre de 2012 Diciembre de 2012 187 MARIA-JOSE´ BOAVIDA.Itall startedwith Margalef’s paperof 1951 193 CARMEN BETANCOURT,ROBERTO SUAREZ´ Y FANNY JORGE.Influencia de losprocesos naturalesy antropico´ ssobrela calidad delagua en cuatro embalses cubanos 205 MANUEL JESUS´ LOPEZ´ -RODR´IGUEZ,JULIO MIGUEL LUZON´ -ORTEGA AND JOSE´ MANUEL TIERNODE FIGUEROA.Onthe biology of twohighmountain populations of stoneflies (Plecoptera, Perlodidae) in the southern IberianPeninsula 213 CONCHA DURAN´ ,MUNIA LANAO,LUIS PEREZ´ Y PEREZ´ ,CARLOS CHICA,ANTONIA ANADON´ Y VINCENT TOUYA.Estimacion´ de loscostesdelainvasion´ delmejillon´ cebra en la cuenca del Ebro(periodo 2005-2009) 231 INMACULADADE VICENTE,RAQUEL LOPEZ´ ,INMACULADA POZO AND ANDY J. GREEN.Nutrientand sediment dynamics in aMediterranean shallowlakeinsouthwestSpain 251 ENRIQUE MORENO-OSTOS,JOSE´ MAR´IA BLANCO,ROBERTO L. PALOMINO-TORRES,JUAN LUCENA, VALERIANO RODR´IGUEZ,D.GLEN GEORGE,CARMELO ESCOT AND JAIME RODR´IGUEZ. The Gulf Stream positioninfluences thefunctionalcompositionofphytoplankton in El Gergal reservoir(Spain) 261 MIGUEL CANEDO˜ -ARGUELLES¨ AND MARIA RIERADEVALL.Anassessmentofthe changesinwater chemistryand in themacroinvertebratecommunity produced duringthe creationofthe newLlobregat river mouth(Barcelona,NESpain) 273 JAV IER SANCHEZ´ -HERNANDEZ´ ,MAR´IA J. SERVIA,RUFINO VIEIRA,SANDRA BARCA-BRAVO AND FERNANDO COBO.References data on thegrowthand populationparametersofbrown trout in siliceous rivers of Galicia (NWSpain) 289 ANA ISABEL LOPEZ´ -ARCHILLA,Ma CARMEN COLETO,CARLOS MONTES,IGNACIO PEN˜ ´IN AND Ma CARMEN GUERRERO.Temporal variationofphytoplankton in twoneighbouringMediterranean shallow lakesinDonana˜ NationalPark(Spain) 305 NUBIA LEON´ LOPEZ´ ,CARLOS A. RIVERA RONDON´ , A´ NGELA ZAPATA,JORGE JIMENEZ´ ,WILLIAM VILLAMIL,GERARDO ARENAS,CARLOS RINCON´ AND TULIO SANCHEZ´ .Factorscontrolling phytoplankton in tropical high-mountaindrinking-waterreservoirs 323 D. VERDIELL-CUBEDO,F.J.OLIVA -PATERNA,A.RUIZ-NAVA RRO AND M. TORRALVA. The first occurrenceof Cobitis paludica (deBuen, 1930) in theSeguraRiver Basin(SE IberianPeninsula) 327 PILAR LOPEZ´ ,JOSEP DOLZ,MARINA ARBAT AND JOAN ARMENGOL.Physical andchemical characterisationofsuperficial sediment of theRibarroja Reservoir(River Ebro, NE Spain) 341 MAR´IA EUGENIA GARC´IA-FERNANDEZ´ ,IARA SEGU´I-CHAPUISYMARINA ABOAL. Kyliniella latvica Skuja(Stylonemataceae, Stylonematophyceae),unrodofito´ indicador de buena calidad delagua ISSN 0213-8409 3 1 Volumen 31 (2) 9 7 7 0 2 1 3 8 4 0 0 2 1 Volumen 31 (2) Volumen Diciembre de 2012 coberta31(2).pdf 1 28/09/2012 12:20:16 Lomo = 9mm Volumen 31. Numero´ 2. 2012 LIMNETICA Revista de la Asociacion´ Iberica´ de Limnolog´ıa 14320 Limnetica 31(2), pàgina 3, 15/11/2012 c Asociacion´ Iberica´ de Limnolog´ıa Deposito´ legal: V-2404-1986 ISSN: 0213-8409 Impresion:´ Gra´ficas Rey Impreso en Espana/Printed˜ in Spain 14320 Limnetica 31(2), pàgina 4, 15/11/2012 Limnetica, 31 (2): i-ii (2012) Limnetica, 27 (1): x-xx (2008) c Asociacion´ Iberica´ de Limnolog´ıa, Madrid. Spain. ISSN: 0213-8409 Maria Jose´ Lemos Boavida: Limnologist and Teacher, in memoriam Maria Jose´ Caramujo R. de Carvalho Centro de Biolog´ıa Ambiental Universidade de Lisboa Maria Jose´ Boavida died on the 30th of August, 2012, aged 64. After graduating in Biology at the University of Lisbon, Portugal, she continued her studies at Kent State University (USA). It was at the end of her first year at Kent that, as she was so fond of mentioning, she became fascinated with a paper published by Ramon Margalef in 1951, relative to the production of phosphatases by Daphnia. This fascination led to her Master thesis topic and later to her Ph.D. studies and the demonstration that zooplankters were really producing their own phosphatases and not only re- leasing those ingested with their algal food (Boavida and Heath, 1984; Boavida, 2010). The role played by phosphorus, phosphorus regeneration and zooplankton interactions in lakes were a fundamental part of her scientific research which led to the development of limnology studies in Portugal. She was the national representative of the International Association of Theoretical and Applied Limnology (SIL), and the Portuguese members of SIL profited from her great effort in keeping us up to date with the latest limnology developments, and organising the bureaucratic aspects of SIL membership. Many of us who were her students, thank her the kindness of translating into Portuguese the book Limnology by her friend R.G. Wetzel, which was famously used as syllabus in her course of “Limnology” at the University of Lisbon. Her curiosity and scientific knowledge, further developed in cooperation with re- searchers both at the University of Lisbon and at several research centres throughout the world, granted her the esteem from co-workers and students alike. As a teacher, Maria Jose´ was well known for her care in preparing her classes and advising students, to whom she imparted her interest in the various phenomena shaping the dynamics of lakes. Many 14320 Limnetica 31(2), pàgina 1, 04/11/2012 ii Maria Jose´ Caramujo R. de Carvalho students and colleagues became interested in aquatic ecology through her influence and guidance. This enthusiasm for science required great dedication and discipline from her part, and often others felt she demanded a similar level of attention and dedication from them. Although the demand for scientific honesty and human decency was a requirement in her dealings with students and co-workers, she was generous with those in need of help, and often brought out the best in them. Allying her drive to help and her characteristic fight against scientific inaccuracy, she recently wrote a “Scientific Glossary of Limnology” in a small format so that “students may use it in the field or poster sessions in conferences, where often doubts arise and there is nobody (...) to ask” (Boavida, 2011). Considering her prolific career, it is fitting that her last book can be carried in the pocket as a protection against embarrassment and error. Maria Jose´ was born in 1948 in Mozambique where she spent her youth, and moved to Portugal in 1968. She always spoke fondly of her free upbringing, the wonderful nature of the land and a time when responsibility for the wellbeing of the fellow human and friendship were all important aspects of the human character. Her passing is a great loss for limnology in Portugal, yet, for those who had the privilege to know her personally, it is the loss of a loyal and generous friend. REFERENCES BOAVIDA, M. J. 2010. It all started with Margalef’s paper of 1951. Limnetica Internet (www.limnetica.es), 1: 1–6. Limnetica, 31: 187–192. BOAVIDA, M. J. 2011. Scientific Glossary of Limnology, 63 pp. Escolar Editora, Lisbon. BOAVIDA, M. J. and R. T. HEATH. 1984. Are the phosphatases released by Daphnia magna components of its food? Limnol. Oceanogr., 29: 641–645. MARGALEF, R. 1951. Role des entomostraces dans la reg´ eneration´ des phosphates. Verh. Internat. Verein. Lim- nol., 11: 246–247. 14320 Limnetica 31(2), pàgina 2, 04/11/2012 Limnetica, 31 (2): 187-192 (2012) Limnetica, 29 (2): x-xx (2011) c Asociación Ibérica de Limnología, Madrid. Spain. ISSN: 0213-8409 It all started with Margalef’s paper of 1951 Maria-José Boavida (†) Universidade de Lisboa, Faculdade de Ciências, Departamento de Biologia Animal e Centro de Biologia Ambiental, Campo Grande C2, 1749-016 Lisboa, Portugal. AIL’s committe has decided to publish this manuscript in this volume in homage to Dr. M. J. Boavida’s career. This paper was previously published in 2010 in Limnetica internet (www.limnetica.es). ABSTRACT It all started with Margalef’s paper of 1951 As early as 1951, Margalef speculated on the production of soluble phosphatases by zooplankton; “entomostracans” were producing their own phosphatases and so contributing to phosphate regeneration. After analytical techniques had been considerably improved and introduced into limnology laboratories, it was verified, almost three decades later, that the eminent scientist was right. The role of soluble phosphatase in fresh waters can be investigated either in straight relationship to plankton phosphatase producers or simply in connection with other chemical entities abundant in lake water, with capacity to condition enzyme activity. Such is the case of humic substances which complex with soluble phosphatase; the enzyme activity will be inactivated when making part of the complex (linked to the humic molecule) and reactivated again once the complex is broken down, e.g. by the action of UV light from the sun. Key words: Daphnia, phosphatase, hydrolysis, photolysis. RESUMEN Todo empezó con el trabajo de Margalef de 1951 Desde 1951 Margalef especuló sobre la producción de fosfatasas solubles por zooplancton; “entomostracans” produjeron sus propias fosfatasas contribuyendo así a la regeneración de fosfato. Casi tres décadas después se ha confirmado que el eminente cientista tenía razón, después de que las técnicas analíticas hayan mejorado significativamente y se hayan introducido en los laboratorios de limnología. El papel de la fosfatasa soluble en aguas dulces puede ser investigado en estrecha relación con el plancton productor o sencillamente en relación con otras entidades químicas que abundan en el agua de los lagos, con capacidad para condicionar la actividad de enzimas. Es el caso de las sustancias húmicas que forman complejos con fosfatasa soluble; la actividad enzimática será desactivada cuando hace parte del complejo (ligado a la molécula húmica) y reactivada
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