David José Nachón García- PhD in Biodiversity and Conservation of the Natural Environment
- M3 at Instituto Español de Oceanografia
David José Nachón García
- PhD in Biodiversity and Conservation of the Natural Environment
- M3 at Instituto Español de Oceanografia
Interdisciplinary Researcher - Bridging Ichthyology, Policy, Stakeholder Engagement & Ecosystem Services.
About
96
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Introduction
My research journey, enriched by competitive grants and international collaborations, focuses on ichthyology, otolith microchemistry, diadromous species, and statistical analysis. I've developed conservation tools—including a serious game and policy guidelines—served on seven committees, and mentored emerging researchers. Proficient in leadership, communication, and multiple languages, I bridge science, policy, and stakeholder engagement to advance ecosystem services.
Current institution
Additional affiliations
June 2019 - September 2022
March 2017 - February 2019
Position
- PostDoc Position
Description
- FAUNA projet
January 2008 - December 2016
Education
September 2003 - September 2008
Publications
Publications (96)
As global temperatures rise, the life-history traits of many marine species are changing, with important implications for sh stocks, ecosystems, and sheries. In sh populations, both plastic and genetic adaptations in traits like body size and maturity timing are in uenced by shing pressures and environmental changes. As ectothermic animals, sh rely...
Regular monitoring of diadromous fishes is critical to inform their management and conservation. Yet, the in-situ data collection these species is challenging due to their complex life cycle and low abundance. Focusing on the sea lamprey (Petromyzon marinus, Petromyzontidae) and the European shads (Alosa alosa and A. fallax, Clupeidae), emblematic...
Natural biocomplexity, characterized by genetic and phenotypic diversity, enhances the resilience of meta-populations by buffering against environmental fluctuations and stochastic events. This diversity acts as a natural bet hedge, where different populations may thrive under varying conditions, ensuring the overall stability and survival of the s...
Existe un creciente reconocimiento internacional de la necesidad de que la gestión pesquera pase de un manejo monoespecífico a un enfoque basado en los ecosistemas. De hecho, varios países han abogado por una estrategia de ordenación pesquera basada en el ecosistema (EBFM por sus siglas en inglés) y, en algunos casos, la han adoptado formalmente. E...
Los rasgos vitales de los peces explotados comercialmente, como la talla corporal y la talla de madurez o L50, están sujetos a cambios en respuesta a los efectos sostenidos, a lo largo del tiempo, de la pesca y el cambio climático. Por ello, el objetivo de la presente comunicación es comprender si los cambios a gran escala de la temperatura ambient...
Diadromous fish have exhibited a dramatic decline since the end of the 20th century. The allis shad (Alosa alosa) population in the Gironde‐Garonne‐Dordogne (GGD) system, once considered as a reference in Europe, remains low despite a fishing ban in 2008. One hypothesis to explain this decline is that the downstream migration and growth dynamics of...
Understanding the link between key life history parameters and environmental variables to evaluate climate change impact on European hake.
Maturity and growth are key life history traits to understand population dynamics, productivity and resilience of fish stocks and thus provide the basis for stock assessment and sustainable management of the sp...
Don't ask don't tell: when science answers unwelcome questions
Management strategy evaluation (MSE) generally involves defining a decision problem, specifying objectives, and simulating the managed system to help evaluate uncertainties, risks, and trade-offs of management alternatives. Stakeholders' involvement is a core component of MSE to design...
The anadromous clupeid allis shad, Alosa alosa (Linnaeus, 1758), and twaite shad, Alosa fallax (Lacépède, 1803), collectively called European shads, are diadromous fish migrating between their reproduction areas in rivers and marine feeding grounds. Both species are in decline due to cumulative impacts of human activities across their life cycle. A...
El sábalo, Alosa alosa (Linnaeus, 1758), y la saboga, Alosa fallax (Lacépède, 1803), son dos especies migradoras anádromas, que pasan la mayor parte de su ciclo vital en el medio marino. La captura en este medio y su desembarco en las lonjas gallegas se viene produciendo de manera recurrente desde hace décadas, por lo que se hacía necesario un estu...
El sábalo, Alosa alosa (Linnaeus, 1758), y la saboga, Alosa fallax (Lacépède, 1803), son dos especies migradoras anádromas y congenéricas, esto es, estrechamente emparentadas, llegando incluso a hibridar entre ellas; hecho que dificulta enormemente su diferenciación. La fase marina representa el grueso del ciclo vital de estas especies y, sin embar...
Allis shad, Alosa alosa (Linnaeus, 1758) and Twaite shad, Alosa fallax (Lacépède, 1803) are two anadromous Clupeidae species that spend most of their life cycle in the marine environment, where they have a coastal distribution, entering the rivers only during the spawning migration. There is no commercial shad fishery at sea; however, due to their...
Allis shad, Alosa alosa (Linnaeus, 1758), and twaite shad, Alosa fallax (Lacépède, 1803),
are two anadromous fish species belonging to the family Clupeidae. Like all other diadromous species, their populations in European rivers are in decline and their scarcity has become an emerging problem. Anthropogenic activities, mainly large dams and other r...
The Allis shad, Alosa alosa (Linnaeus, 1758) and the Twaite shad, Alosa fallax (Lacépède, 21 1803) are two anadromous and congeneric Clupeidae species, i.e. closely related, even hybridising 22 with each other, which makes it very difficult to differentiate between them. Marine phase repre-23 sents the major part of the life cycle of these species,...
Deciphering the effects of historical and recent demographic processes responsible for the spatial patterns of genetic diversity and structure is a key objective in evolutionary and conservation biology. Using population genetic analyses, we investigated the demographic history, the contemporary genetic diversity and structure, and the occurrence o...
Synthesis of the use of otolith microchemistry to resolve key aspects of European shads life such as dispersal capabilities and connection of populations in the marine environment, homing or the tactics of juveniles during downstream migration to the sea.
Dissemination article on the 1MARDEALOSAS project, in a magazine (CERNA) of an ecological association (ADEGA, stakeholder of the project).
Abstract (in Galician):
O sábalo e a saboga (zamborcas) son dúas especies migradoras anádromas, con reprodución fluvial e fase de crecemento mariño, onde pasan a meirande parte da súa vida. A pesares da import...
Deciphering the effects of historical and recent demographic processes responsible for the spatial patterns of genetic diversity and structure is a key objective in evolutionary and conservation biology. Using genetic analyses, we investigated the demographic history, the contemporary genetic diversity and structure, and the occurrence of hybridiza...
The increase of non-native species in rivers is of great concern. To assess the potential impact of a species it is necessary to consider the ecological state of the receiving ecosystem and the biology of the potentially invasive species. In this work we characterize two populations of Gobio lozanoi Doadrio & Madeira, 2004 (bio-metric and demograph...
Presentation, under invitation of the congress organisers, of the main results of the 1MARDEALOSAS project.
The European shads, Allis shad (Alosa alosa) and Twaite shad (Alosa fallax), are a complex of two sympatric sister species of anadromous Clupeidae species. These two anadromous species spend most of their life cycle in the marine environmen...
Dissemination article on the 1MARDEALOSAS project, in a magazine (CERNA) of an ecological association (ADEGA, stakeholder of the project).
Abstract (in Galician): O sábalo e a saboga son especies anádromas moi parecidas, con reprodución fluvial e fase de crecemento mariño. Aínda que non son obxecto de pesca comercial, o seu comportamento gregario,...
Hybridization dynamics between co‐occurring species in environments where human‐mediated changes take place is important to quantify for furthering our understanding of human impacts on species evolution and for informing management. The allis shad Alosa alosa (Linnaeus, 1758) and twaite shad Alosa fallax (Lacépède, 1803), two clupeids sister speci...
Scientists have a moral obligation
to clearly warn humanity of any
catastrophic threat and to “tell it like
it is.” On the basis of this obligation
and the graphical indicators presented
below, we declare, with more than
11,000 scientist signatories from
around the world, clearly and unequivocally that planet Earth is facing a
climate emergency.
Dissemination article on the European project DiadES, in a magazine (CERNA) of an ecological association (ADEGA, stakeholder of the project).
Abstract (in Galician)
As poboacións de peixes migradores atópanse en franco declive a nivel global. As causas subxacentes desta diminución son a perda do hábitat, a sobrepesca, a contaminación e o cambio c...
A comprehensive review of the natural history of the allis shad Alosa alosa in Spain.
Peces - Orden Clupeiformes - Familia Clupeidae en la Enciclopedia Virtual de Vertebrados Españoles, http://www.vertebradosibericos.org/
A comprehensive review of the natural history of the twaite shad Alosa fallax in Spain.
Peces - Orden Clupeiformes - Familia Clupeidae en la Enciclopedia Virtual de Vertebrados Españoles, http://www.vertebradosibericos.org/.
Alosa alosa
Allis shad (Alosa alosa) mature at 3–6 years of age and migrate many hundreds of kilometres upstream into their natal river to spawn. Spawning occurs during spring in the
main river and major tributaries, in shallow waters, and over gravel substrate (Baglinière
et al., 2003). The adults usually die after spawning. Allis shad larvae hatc...
The specific stock composition and dispersion of anadromous fish species aggregations in the marine environment are poorly known, while they can play a major role in the metapopulation dynamics. Otolith microchemistry has proven to be a powerful tool to address natal origins of anadromous fish. We used archived otolith microchemistry to investigate...
All around the world, diadromous fish are facing multiple anthropogenic pressures resulting in a global decline in these migratory species. In Gironde, the allis shad populations which were the most abundant in Europe are no exception and have dramatically declined since 2000. Failure in reproduction success is one of the proposed explanations for...
Allis shad, Alosa alosa (Linnaeus, 1758) and twaite shad, Alosa fallax (Lacépède, 1803), are a complex of two sister species of anadromous Clupeidae species, with A. alosa populations facing a great decline in the 2000s. Whereas the freshwater part of the biological cycle of these species was widely addressed (mainly for A. alosa), information abou...
Allis shad, Alosa alosa (Linnaeus, 1758) and twaite shad, Alosa fallax (Lacépède, 1803), are a complex of two sister species of anadromous Clupeidae species, with A. alosa populations facing a great decline in the 2000s. Whereas the freshwater part of the biological cycle of these species was widely addressed (mainly for A. alosa), information abou...
L’alose vraie, Alosa alosa (Linnaeus, 1758) et l’alose feinte, Alosa fallax (Lacépède, 1803), sont un complexe de deux espèces sœurs anadromes de Clupeidae, les populations d'alose vraie faisant face à un grand déclin dans les années 2000. Alors que la partie en eau douce du cycle biologique de ces espèces a été largement abordée (principalement po...
The non-native signal crayfish Pacifastacus leniusculus (Dana, 1852) has successfully been established in many catchments of Europe, causing detrimental impacts on both native flora and fauna. The aim of this paper was to report the anthropogenic introduction of P. leniusculus and its ectosymbionts (family Branchiobdellidae) in the River Tambre (NW...
POPULATION DYNAMICS AND MICROCHEMISTRY OF OTOLITHS OF TWAITE SHAD POPULATIONS, ALOSA FALLAX (LACÉPÈDE, 1803), IN THE RIVERS ULLA AND MIÑO
The twaite shad Alosa fallax (Lacépède, 1803), is a species that shows a great importance from the ecological, scientific, ethnographic and economical points of view. The lack of data and scientific work on the...
Entre octubre del año 2012 y febrero del 2015 se analizaron 181 muestras de agua de nueve embalses de la cuenca hidrográfica del Miño-Sil (As Conchas, Cachamuíña, Castadón, Faramontaos, Os Peares, Prada, Salas y Vilasouto). En las muestras se identificaron y cuantificaron las especies de cianobacterias presentes, se identificó la presencia de taxon...
After a juvenile haematophagous stage developed mainly at sea, the sea lamprey Petromyzon marinus Linnaeus, 1758 stop feeding and return to the river to spawn. One of the main pressures in this stage is the presence of obstacles that reduce the accessible habitat, the mobility of individuals within this section and the energy resources available fo...
Evaluation of fecundity is a key step to quantify the reproductive potential of individual fish and to understand the stock-recruitment relationship, increasing the knowledge of the state of a stock and improving the assessment of the spawning stock biomass. For the present work we investigated the fecundity and gonad development in anadromous fema...
Biliverdin and bilirubin are breakdown products of normal heme catabolism, caused by the body's clearance of aged red blood cells which contain hemoglobin. Bilirubin is created by the activity of biliverdin reductase on biliverdin, a green tetrapyrrolic bile pigment that is also a product of heme catabolism (bilirubin, when oxidized, reverts to bec...
After several years in freshwater, sea lamprey Petromyzon marinus L. 1758 ammocoetes undergo metamorphosis that allows postmetamorphic individuals to migrate to the sea and start the haematophagous feeding. Very little and fragmented information, based on scarce captures of lampreys or wounded preys, is available concerning the postmetamorphic phas...
Knowledge regarding the marine phase of twaite shad (Alosa fallax (Lacépède, 1803)) and allis shad (Alosa alosa (Linnaeus, 1758)) remains limited. To understand the coastal and continental distribution and dynamic of migration of these species, in the present study we collected official data records of marine landings (kg), separated according to s...
Allis shad (Alosa alosa) and twaite shad (Alosa fallax) are anadromous members of the family Clupeidae that have a pelagic behaviour at sea, especially in areas close to the shore, migrating into rivers to reproduce. The upstream spawning migration of adults usually starts in the late winter and continues throughout the spring. The larvae and juven...
Allis shad (Alosa alosa) and twaite shad (Alosa fallax) are anadromous clupeids that live mainly in coastal waters and have a pelagic lifestyle; they migrate to rivers for spawning. Nematodes of the genus Anisakis are marine parasites which use cetaceans as final hosts, zooplankton a sintermediate hosts and fish and cephalopods as paratenic hosts....
Samples of anadromous Alosa alosa (Clupeidae) (n = 163) and Alosa fallax (Clupeidae) (n = 223), caught in Western Iberian Peninsula Rivers from 2008 to 2013, were examined for buccal, branchial and internal macroparasites, which were identified using morphological and molecular methods. Alosa alosa were infected with Anisakis simplex s.s., Anisakis...
Las especies de peces migradores fueron históricamente capturadas mediante una gran variedad de artes y medios en el Baixo Miño. Entre ellas se hallan dos especies de alosas: el sábalo o sável, Alosa alosa (Linnaeus, 1758), y la saboga o savelha, Alosa fallax (Lacépède, 1803), que se encuentran pues en simpatría en esta cuenca. Por su importancia e...
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Spawning individuals of allis shad, Alosa alosa (Linnaeus, 1758), and twaite shad, Alosa fallax (Lacépède, 1803), were sampled from three rivers on the Atlantic coast of the Iberian Peninsula (Ulla, Minho, Mondego) during 2008 to 2013 to assess the presence of the zoonotic marine parasite Anisakis spp. larvae. The results revealed that both shad sp...
Understanding dispersal capacities for migratory species is crucial for their management. By coupling otolith microchemistry and microsatellite genetic analyses, we provided information on snapshot and long-term dispersal capacity of Allis shad (Alosa alosa), an anadromous clupeid in decline throughout its distribution range. The allocation of nata...
Approximately 6% of the freshwater living northern straight-mouth nase Pseudochondrostoma duriense in two Spanish rivers had attached post-metamorphic sea lamprey Petromyzon marinus. Minimum prey size was 16·1 cm fork length and 56·3 g mass. The condition factor of attacked P. duriense was 16% lower than that of unattacked conspecifics.
In order to contribute to a better understanding of feeding behaviour of adult twaite shad, Alosa fallax, in freshwater, we studied the stomach content composition of 147 A. fallax during their upstream spawning migration in the River Ulla (Galicia, NW Spain). The diet composition included 34 types of prey, aquatic invertebrates being the most impo...
Title: Vectors, age and origin of non-indigenous freshwater species naturalized in Galicia
The arrival of many non-indigenous freshwater species (NIFS) to Galicia is relatively recent. This work provides the updated list with the first record dates of NIFS naturalized in the Iberian Peninsula and Galicia, its vectors of introduction, native regions...
Title: On the invasive character of the freshwater exotic species available for sale in the pet shops of Galicia
Pet trade is an important pathway for introducing alien species. We surveyed 45 pet shops in Galicia looking for exotic freshwater species of molluscs, crustaceans, amphibians, reptilians and fishes. A questionnaire was designed to obtai...
Conservation guide for the Allis shad population of the Minho River.
