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1. Biological invasions are a population‐level rather than a species‐level phenomenon

Author

Haubrock, Phillip J., primary, Soto, Ismael, additional, Ahmed, Danish A., additional, Ansari, Ali R., additional, Tarkan, Ali Serhan, additional, Kurtul, Irmak, additional, Macêdo, Rafael L., additional, Lázaro‐Lobo, Adrián, additional, Toutain, Mathieu, additional, Parker, Ben, additional, Błońska, Dagmara, additional, Guareschi, Simone, additional, Cano‐Barbacil, Carlos, additional, Dominguez Almela, Victoria, additional, Andreou, Demetra, additional, Moyano, Jaime, additional, Akalın, Sencer, additional, Kaya, Cüneyt, additional, Bayçelebi, Esra, additional, Yoğurtçuoğlu, Baran, additional, Briski, Elizabeta, additional, Aksu, Sadi, additional, Emiroğlu, Özgür, additional, Mammola, Stefano, additional, De Santis, Vanessa, additional, Kourantidou, Melina, additional, Pincheira‐Donoso, Daniel, additional, Britton, J. Robert, additional, Kouba, Antonín, additional, Dolan, Ellen J., additional, Kirichenko, Natalia I., additional, García‐Berthou, Emili, additional, Renault, David, additional, Fernandez, Romina D., additional, Yapıcı, Sercan, additional, Giannetto, Daniela, additional, Nuñez, Martin A., additional, Hudgins, Emma J., additional, Pergl, Jan, additional, Milardi, Marco, additional, Musolin, Dmitrii L., additional, and Cuthbert, Ross N., additional

Published
2024
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2. Taming the terminological tempest in invasion science

Author

Soto, Ismael, primary, Balzani, Paride, additional, Carneiro, Laís, additional, Cuthbert, Ross N., additional, Macêdo, Rafael, additional, Serhan Tarkan, Ali, additional, Ahmed, Danish A., additional, Bang, Alok, additional, Bacela‐Spychalska, Karolina, additional, Bailey, Sarah A., additional, Baudry, Thomas, additional, Ballesteros‐Mejia, Liliana, additional, Bortolus, Alejandro, additional, Briski, Elizabeta, additional, Britton, J. Robert, additional, Buřič, Miloš, additional, Camacho‐Cervantes, Morelia, additional, Cano‐Barbacil, Carlos, additional, Copilaș‐Ciocianu, Denis, additional, Coughlan, Neil E., additional, Courtois, Pierre, additional, Csabai, Zoltán, additional, Dalu, Tatenda, additional, De Santis, Vanessa, additional, Dickey, James W. E., additional, Dimarco, Romina D., additional, Falk‐Andersson, Jannike, additional, Fernandez, Romina D., additional, Florencio, Margarita, additional, Franco, Ana Clara S., additional, García‐Berthou, Emili, additional, Giannetto, Daniela, additional, Glavendekic, Milka M., additional, Grabowski, Michał, additional, Heringer, Gustavo, additional, Herrera, Ileana, additional, Huang, Wei, additional, Kamelamela, Katie L., additional, Kirichenko, Natalia I., additional, Kouba, Antonín, additional, Kourantidou, Melina, additional, Kurtul, Irmak, additional, Laufer, Gabriel, additional, Lipták, Boris, additional, Liu, Chunlong, additional, López‐López, Eugenia, additional, Lozano, Vanessa, additional, Mammola, Stefano, additional, Marchini, Agnese, additional, Meshkova, Valentyna, additional, Milardi, Marco, additional, Musolin, Dmitrii L., additional, Nuñez, Martin A., additional, Oficialdegui, Francisco J., additional, Patoka, Jiří, additional, Pattison, Zarah, additional, Pincheira‐Donoso, Daniel, additional, Piria, Marina, additional, Probert, Anna F., additional, Rasmussen, Jes Jessen, additional, Renault, David, additional, Ribeiro, Filipe, additional, Rilov, Gil, additional, Robinson, Tamara B., additional, Sanchez, Axel E., additional, Schwindt, Evangelina, additional, South, Josie, additional, Stoett, Peter, additional, Verreycken, Hugo, additional, Vilizzi, Lorenzo, additional, Wang, Yong‐Jian, additional, Watari, Yuya, additional, Wehi, Priscilla M., additional, Weiperth, András, additional, Wiberg‐Larsen, Peter, additional, Yapıcı, Sercan, additional, Yoğurtçuoğlu, Baran, additional, Zenni, Rafael D., additional, Galil, Bella S., additional, Dick, Jaimie T. A., additional, Russell, James C., additional, Ricciardi, Anthony, additional, Simberloff, Daniel, additional, Bradshaw, Corey J. A., additional, and Haubrock, Phillip J., additional

Published
2024
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3. Understanding the complex dynamics of zebra mussel invasions over several decades in European rivers: drivers, impacts and predictions

Author

Haubrock, Phillip J., Soto, Ismael, Kourantidou, Melina, Ahmed, Danish A., Serhan Tarkan, Ali, Balzani, Paride, Bego, Kristi, Kouba, Antonín, Aksu, Sadi, Briski, Elizabeta, Sylvester, Francisco, De Santis, Vanessa, Archambaud‐Suard, Gaït, Bonada, Núria, Cañedo‐Argüelles, Miguel, Csabai, Zoltán, Datry, Thibault, Floury, Mathieu, Fruget, Jean‐François, Jones, John Iwan, Lizee, Marie‐Helene, Maire, Anthony, Murphy, John F., Ozolins, Davis, Jessen Rasmussen, Jes, Skuja, Agnija, Várbíró, Gábor, Verdonschot, Piet, Verdonschot, Ralf C. M., Wiberg‐Larsen, Peter, Cuthbert, Ross N., Haubrock, Phillip J., Soto, Ismael, Kourantidou, Melina, Ahmed, Danish A., Serhan Tarkan, Ali, Balzani, Paride, Bego, Kristi, Kouba, Antonín, Aksu, Sadi, Briski, Elizabeta, Sylvester, Francisco, De Santis, Vanessa, Archambaud‐Suard, Gaït, Bonada, Núria, Cañedo‐Argüelles, Miguel, Csabai, Zoltán, Datry, Thibault, Floury, Mathieu, Fruget, Jean‐François, Jones, John Iwan, Lizee, Marie‐Helene, Maire, Anthony, Murphy, John F., Ozolins, Davis, Jessen Rasmussen, Jes, Skuja, Agnija, Várbíró, Gábor, Verdonschot, Piet, Verdonschot, Ralf C. M., Wiberg‐Larsen, Peter, and Cuthbert, Ross N.

Abstract

The zebra mussel Dreissena polymorpha is one of the most successful, notorious, and detrimental aquatic invasive non-native species worldwide, having invaded Europe and North America while causing substantial ecological and socio-economic impacts. Here, we investigated the spatiotemporal trends in this species' invasion success using 178 macroinvertebrate abundance time series, containing 1451 records of D. polymorpha collected across nine European countries between 1972–2019. Using these raw (absolute) abundance data, we examined trends and drivers of occurrences and relative abundances of D. polymorpha within invaded communities. Meta-regression models revealed non-significant trends both at the European level and for the majority of the invaded countries, except for France (significant decreasing trend) and Hungary (marginally positive trend). At the European level, the number of D. polymorpha occurrences over time followed a flat-top bell-shaped distribution, with a steep increase between 1973–1989 followed by a plateau phase prior to significantly declining post-1998. Using a series of climatic and hydromorphological site-specific characteristics of invaded and uninvaded sites from two periods (1998–2002; 2011–2015), we found that native richness, non-native abundance, distance to the next barrier, and elevation were associated with the occurrence of D. polymorpha. We also found that higher native richness and lower latitude were related to lower relative abundances. Using Cohen's D as a measure of D. polymorpha impact, we found that biodiversity within the invaded sites was initially higher than in uninvaded ones, but then declined, suggesting differences in biodiversity trends across invaded and uninvaded sites. While our results emphasise the high invasion success of D. polymorpha, increasing stressors within the context of global change – particularly ongoing climate change – are likely to enhance invasion rates and the impact of D. polymorpha in the near f

Published
2024
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4. Taming the terminological tempest in invasion science

Author

Soto, Ismael, Balzani, Paride, Carneiro, Laís, Cuthbert, Ross N., Macêdo, Rafael, Serhan Tarkan, Ali, Ahmed, Danish A., Bang, Alok, Bacela‐spychalska, Karolina, Bailey, Sarah A., Baudry, Thomas, Ballesteros‐mejia, Liliana, Bortolus, Alejandro, Briski, Elizabeta, Britton, J. Robert, Buřič, Miloš, Camacho‐cervantes, Morelia, Cano‐barbacil, Carlos, Copilaș‐ciocianu, Denis, Coughlan, Neil E., Courtois, Pierre, Csabai, Zoltán, Dalu, Tatenda, De Santis, Vanessa, Dickey, James W. E., Dimarco, Romina D., Falk‐andersson, Jannike, Fernandez, Romina D., Florencio, Margarita, Franco, Ana Clara S., García‐berthou, Emili, Giannetto, Daniela, Glavendekic, Milka M., Grabowski, Michał, Heringer, Gustavo, Herrera, Ileana, Huang, Wei, Kamelamela, Katie L., Kirichenko, Natalia I., Kouba, Antonín, Kourantidou, Melina, Kurtul, Irmak, Laufer, Gabriel, Lipták, Boris, Liu, Chunlong, López‐lópez, Eugenia, Lozano, Vanessa, Mammola, Stefano, Marchini, Agnese, Meshkova, Valentyna, Milardi, Marco, Musolin, Dmitrii L., Nuñez, Martin A., Oficialdegui, Francisco J., Patoka, Jiří, Pattison, Zarah, Pincheira‐donoso, Daniel, Piria, Marina, Probert, Anna F., Rasmussen, Jes Jessen, Renault, David, Ribeiro, Filipe, Rilov, Gil, Robinson, Tamara B., Sanchez, Axel E., Schwindt, Evangelina, South, Josie, Stoett, Peter, Verreycken, Hugo, Vilizzi, Lorenzo, Wang, Yong‐jian, Watari, Yuya, Wehi, Priscilla M., Weiperth, András, Wiberg‐larsen, Peter, Yapıcı, Sercan, Yoğurtçuoğlu, Baran, Zenni, Rafael D., Galil, Bella S., Dick, Jaimie T. A., Russell, James C., Ricciardi, Anthony, Simberloff, Daniel, Bradshaw, Corey J. A., Haubrock, Phillip J., Soto, Ismael, Balzani, Paride, Carneiro, Laís, Cuthbert, Ross N., Macêdo, Rafael, Serhan Tarkan, Ali, Ahmed, Danish A., Bang, Alok, Bacela‐spychalska, Karolina, Bailey, Sarah A., Baudry, Thomas, Ballesteros‐mejia, Liliana, Bortolus, Alejandro, Briski, Elizabeta, Britton, J. Robert, Buřič, Miloš, Camacho‐cervantes, Morelia, Cano‐barbacil, Carlos, Copilaș‐ciocianu, Denis, Coughlan, Neil E., Courtois, Pierre, Csabai, Zoltán, Dalu, Tatenda, De Santis, Vanessa, Dickey, James W. E., Dimarco, Romina D., Falk‐andersson, Jannike, Fernandez, Romina D., Florencio, Margarita, Franco, Ana Clara S., García‐berthou, Emili, Giannetto, Daniela, Glavendekic, Milka M., Grabowski, Michał, Heringer, Gustavo, Herrera, Ileana, Huang, Wei, Kamelamela, Katie L., Kirichenko, Natalia I., Kouba, Antonín, Kourantidou, Melina, Kurtul, Irmak, Laufer, Gabriel, Lipták, Boris, Liu, Chunlong, López‐lópez, Eugenia, Lozano, Vanessa, Mammola, Stefano, Marchini, Agnese, Meshkova, Valentyna, Milardi, Marco, Musolin, Dmitrii L., Nuñez, Martin A., Oficialdegui, Francisco J., Patoka, Jiří, Pattison, Zarah, Pincheira‐donoso, Daniel, Piria, Marina, Probert, Anna F., Rasmussen, Jes Jessen, Renault, David, Ribeiro, Filipe, Rilov, Gil, Robinson, Tamara B., Sanchez, Axel E., Schwindt, Evangelina, South, Josie, Stoett, Peter, Verreycken, Hugo, Vilizzi, Lorenzo, Wang, Yong‐jian, Watari, Yuya, Wehi, Priscilla M., Weiperth, András, Wiberg‐larsen, Peter, Yapıcı, Sercan, Yoğurtçuoğlu, Baran, Zenni, Rafael D., Galil, Bella S., Dick, Jaimie T. A., Russell, James C., Ricciardi, Anthony, Simberloff, Daniel, Bradshaw, Corey J. A., and Haubrock, Phillip J.

Abstract

Standardised terminology in science is important for clarity of interpretation and communication. In invasion science – a dynamic and rapidly evolving discipline – the proliferation of technical terminology has lacked a standardised framework for its development. The result is a convoluted and inconsistent usage of terminology, with various discrepancies in descriptions of damage and interventions. A standardised framework is therefore needed for a clear, universally applicable, and consistent terminology to promote more effective communication across researchers, stakeholders, and policymakers. Inconsistencies in terminology stem from the exponential increase in scientific publications on the patterns and processes of biological invasions authored by experts from various disciplines and countries since the 1990s, as well as publications by legislators and policymakers focusing on practical applications, regulations, and management of resources. Aligning and standardising terminology across stakeholders remains a challenge in invasion science. Here, we review and evaluate the multiple terms used in invasion science (e.g. ‘non‐native’, ‘alien’, ‘invasive’ or ‘invader’, ‘exotic’, ‘non‐indigenous’, ‘naturalised’, ‘pest’) to propose a more simplified and standardised terminology. The streamlined framework we propose and translate into 28 other languages is based on the terms (i) ‘non‐native’, denoting species transported beyond their natural biogeographic range, (ii) ‘established non‐native’, i.e. those non‐native species that have established self‐sustaining populations in their new location(s) in the wild, and (iii) ‘invasive non‐native’ – populations of established non‐native species that have recently spread or are spreading rapidly in their invaded range actively or passively with or without human mediation. We also highlight the importance of conceptualising ‘spread’ for classifying invasiveness and ‘impact’ for management. Finally, we propose a protocol for class

Published
2024
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5. Biological invasions are a population‐level rather than a species‐level phenomenon

Author

Haubrock, Phillip J., Soto, Ismael, Ahmed, Danish A., Ansari, Ali R., Tarkan, Ali Serhan, Kurtul, Irmak, Macêdo, Rafael L., Lázaro‐Lobo, Adrián, Toutain, Mathieu, Parker, Ben, Błońska, Dagmara, Guareschi, Simone, Cano‐Barbacil, Carlos, Dominguez Almela, Victoria, Andreou, Demetra, Moyano, Jaime, Akalın, Sencer, Kaya, Cüneyt, Bayçelebi, Esra, Yoğurtçuoğlu, Baran, Briski, Elizabeta, Aksu, Sadi, Emiroğlu, Özgür, Mammola, Stefano, De Santis, Vanessa, Kourantidou, Melina, Pincheira‐Donoso, Daniel, Britton, J. Robert, Kouba, Antonín, Dolan, Ellen J., Kirichenko, Natalia I., García‐Berthou, Emili, Renault, David, Fernandez, Romina D., Yapıcı, Sercan, Giannetto, Daniela, Nuñez, Martin A., Hudgins, Emma J., Pergl, Jan, Milardi, Marco, Musolin, Dmitrii L., Cuthbert, Ross N., Haubrock, Phillip J., Soto, Ismael, Ahmed, Danish A., Ansari, Ali R., Tarkan, Ali Serhan, Kurtul, Irmak, Macêdo, Rafael L., Lázaro‐Lobo, Adrián, Toutain, Mathieu, Parker, Ben, Błońska, Dagmara, Guareschi, Simone, Cano‐Barbacil, Carlos, Dominguez Almela, Victoria, Andreou, Demetra, Moyano, Jaime, Akalın, Sencer, Kaya, Cüneyt, Bayçelebi, Esra, Yoğurtçuoğlu, Baran, Briski, Elizabeta, Aksu, Sadi, Emiroğlu, Özgür, Mammola, Stefano, De Santis, Vanessa, Kourantidou, Melina, Pincheira‐Donoso, Daniel, Britton, J. Robert, Kouba, Antonín, Dolan, Ellen J., Kirichenko, Natalia I., García‐Berthou, Emili, Renault, David, Fernandez, Romina D., Yapıcı, Sercan, Giannetto, Daniela, Nuñez, Martin A., Hudgins, Emma J., Pergl, Jan, Milardi, Marco, Musolin, Dmitrii L., and Cuthbert, Ross N.

Abstract

Biological invasions pose a rapidly expanding threat to the persistence, functioning and service provisioning of ecosystems globally, and to socio-economic interests. The stages of successful invasions are driven by the same mechanism that underlies adaptive changes across species in general-via natural selection on intraspecific variation in traits that influence survival and reproductive performance (i.e., fitness). Surprisingly, however, the rapid progress in the field of invasion science has resulted in a predominance of species-level approaches (such as deny lists), often irrespective of natural selection theory, local adaptation and other population-level processes that govern successful invasions. To address these issues, we analyse non-native species dynamics at the population level by employing a database of European freshwater macroinvertebrate time series, to investigate spreading speed, abundance dynamics and impact assessments among populations. Our findings reveal substantial variability in spreading speed and abundance trends within and between macroinvertebrate species across biogeographic regions, indicating that levels of invasiveness and impact differ markedly. Discrepancies and inconsistencies among species-level risk screenings and real population-level data were also identified, highlighting the inherent challenges in accurately assessing population-level effects through species-level assessments. In recognition of the importance of population-level assessments, we urge a shift in invasive species management frameworks, which should account for the dynamics of different populations and their environmental context. Adopting an adaptive, region-specific and population-focused approach is imperative, considering the diverse ecological contexts and varying degrees of susceptibility. Such an approach could improve and refine risk assessments while promoting mechanistic understandings of risks and impacts, thereby enabling the development of more eff

Published
2024
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6. Understanding the complex dynamics of zebra mussel invasions over several decades in European rivers: drivers, impacts and predictions

Author

Haubrock, Phillip J., primary, Soto, Ismael, additional, Kourantidou, Melina, additional, Ahmed, Danish A., additional, Serhan Tarkan, Ali, additional, Balzani, Paride, additional, Bego, Kristi, additional, Kouba, Antonín, additional, Aksu, Sadi, additional, Briski, Elizabeta, additional, Sylvester, Francisco, additional, De Santis, Vanessa, additional, Archambaud‐Suard, Gaït, additional, Bonada, Núria, additional, Cañedo‐Argüelles, Miguel, additional, Csabai, Zoltán, additional, Datry, Thibault, additional, Floury, Mathieu, additional, Fruget, Jean‐François, additional, Jones, John Iwan, additional, Lizee, Marie‐Helene, additional, Maire, Anthony, additional, Murphy, John F., additional, Ozolins, Davis, additional, Jessen Rasmussen, Jes, additional, Skuja, Agnija, additional, Várbíró, Gábor, additional, Verdonschot, Piet, additional, Verdonschot, Ralf C. M., additional, Wiberg‐Larsen, Peter, additional, and Cuthbert, Ross N., additional

Published
2024
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8. Tracking a killer shrimp: Dikerogammarus villosus invasion dynamics across Europe

Author

Soto, Ismael, Cuthbert, Ross N., Ahmed, Danish A., Kouba, Antonín, Domisch, Sami, Marquez, Jaime R. G., Beidas, Ayah, Amatulli, Giuseppe, Kiesel, Jens, Shen, Longzhu Q., Florencio, Margarita, Lima, Herlander, Briski, Elizabeta, Altermatt, Florian, Archambaud‐Suard, Gaït, Borza, Peter, Csabai, Zoltan, Datry, Thibault, Floury, Mathieu, Forcellini, Maxence, Fruget, Jean‐François, Leitner, Patrick, Lizée, Marie‐Hélène, Maire, Anthony, Ricciardi, Anthony, Schäfer, Ralf B., Stubbington, Rachel, Van der Lee, Gea H., Várbíró, Gábor, Verdonschot, Ralf C. M., Haase, Peter, Haubrock, Phillip J., Soto, Ismael, Cuthbert, Ross N., Ahmed, Danish A., Kouba, Antonín, Domisch, Sami, Marquez, Jaime R. G., Beidas, Ayah, Amatulli, Giuseppe, Kiesel, Jens, Shen, Longzhu Q., Florencio, Margarita, Lima, Herlander, Briski, Elizabeta, Altermatt, Florian, Archambaud‐Suard, Gaït, Borza, Peter, Csabai, Zoltan, Datry, Thibault, Floury, Mathieu, Forcellini, Maxence, Fruget, Jean‐François, Leitner, Patrick, Lizée, Marie‐Hélène, Maire, Anthony, Ricciardi, Anthony, Schäfer, Ralf B., Stubbington, Rachel, Van der Lee, Gea H., Várbíró, Gábor, Verdonschot, Ralf C. M., Haase, Peter, and Haubrock, Phillip J.

Abstract

Aim: Invasive alien species are a growing problem worldwide due to their ecological, economic and human health impacts. The “killer shrimp” Dikerogammarus villosus is a notorious invasive alien amphipod from the Ponto-Caspian region that has invaded many fresh and brackish waters across Europe. Understandings of large-scale population dynamics of highly impactful invaders such as D. villosus are lacking, inhibiting predictions of impact and efficient timing of management strategies. Hence, our aim was to assess trends and dynamics of D. villosus as well as its impacts in freshwater rivers and streams. Location: Europe. Methods: We analysed 96 European time series between 1994 and 2019 and identified trends in the relative abundance (i.e. dominance %) of D. villosus in invaded time series, as well as a set of site-specific characteristics to identify drivers and determinants of population changes and invasion dynamics using meta-regression modelling. We also looked at the spread over space and time to estimate the invasion speed (km/year) of D. villosus in Europe. We investigated the impact of D. villosus abundance on recipient community metrics (i.e. abundance, taxa richness, temporal turnover, Shannon diversity and Pielou evenness) using generalized linear models. Results: Population trends varied across the time series. Nevertheless, community dominance of D. villosus increased over time across all time series. The frequency of occurrences (used as a proxy for invader spread) was well described by a Pareto distribution, whereby we estimated a lag phase (i.e. the time between introduction and spatial expansion) of approximately 28 years, followed by a gradual increase before new occurrences declined rapidly in the long term. D. villosus population change was associated with decreased taxa richness, community turnover and Shannon diversity. Main Conclusion: Our results show that D. villosus is well-established in European waters and its abundance significantly alter

Published
2023
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9. Tracking a killer shrimp: Dikerogammarus villosus invasion dynamics across Europe

Author

Soto, Ismael, primary, Cuthbert, Ross N., additional, Ahmed, Danish A., additional, Kouba, Antonín, additional, Domisch, Sami, additional, Marquez, Jaime R. G., additional, Beidas, Ayah, additional, Amatulli, Giuseppe, additional, Kiesel, Jens, additional, Shen, Longzhu Q., additional, Florencio, Margarita, additional, Lima, Herlander, additional, Briski, Elizabeta, additional, Altermatt, Florian, additional, Archambaud‐Suard, Gaït, additional, Borza, Peter, additional, Csabai, Zoltan, additional, Datry, Thibault, additional, Floury, Mathieu, additional, Forcellini, Maxence, additional, Fruget, Jean‐François, additional, Leitner, Patrick, additional, Lizée, Marie‐Hélène, additional, Maire, Anthony, additional, Ricciardi, Anthony, additional, Schäfer, Ralf B., additional, Stubbington, Rachel, additional, Van der Lee, Gea H., additional, Várbíró, Gábor, additional, Verdonschot, Ralf C. M., additional, Haase, Peter, additional, and Haubrock, Phillip J., additional

Published
2022
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22. Invasion biology in non‐free‐living species: interactions between abiotic (climatic) and biotic (host availability) factors in geographical space in crayfish commensals (Ostracoda, Entocytheridae)

Author

Mestre, Alexandre, primary, Aguilar‐Alberola, Josep A., additional, Baldry, David, additional, Balkis, Husamettin, additional, Ellis, Adam, additional, Gil‐Delgado, Jose A., additional, Grabow, Karsten, additional, Klobučar, Göran, additional, Kouba, Antonín, additional, Maguire, Ivana, additional, Martens, Andreas, additional, Mülayim, Ayşegül, additional, Rueda, Juan, additional, Scharf, Burkhard, additional, Soes, Menno, additional, S. Monrós, Juan, additional, and Mesquita‐Joanes, Francesc, additional

Published
2013
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24. Subcellular localization of calcium deposits in the noble crayfish Astacus astacus spermatophore: Implications for post-mating spermatophore hardening and spermatozoon maturation.

Author

Niksirat H and Kouba A

Subjects
Animals, Cell Nucleus ultrastructure, Male, Reproduction, Spermatogonia metabolism, Astacoidea cytology, Astacoidea metabolism, Calcification, Physiologic physiology, Calcium metabolism, Spermatogonia cytology
Abstract

The freshly ejaculated spermatophore of crayfish undergoes a hardening process during post-mating storage on the body surface of female. The ultrastructural distribution of calcium deposits were studied and compared in freshly ejaculated and post-mating noble crayfish spermatophores, using the oxalate-pyroantimonate technique, to determine possible roles of calcium in post-mating spermatophore hardening and spermatozoon maturation. Small particles of sparsely distributed calcium deposits were visible in the wall of freshly ejaculated spermatophore. Also, large amount of calcium deposits were visible in the membranes of the freshly ejaculated spermatozoon. Five minutes post-ejaculation, granules in the spermatophore wall appeared as porous formations with numerous electron lucent spaces. Calcium deposits were visible within the spaces and scattered in the spermatophore wall matrix, where smaller calcium deposits combined to form globular calcium deposits. Large numbers of the globular calcium deposits were visible in the wall of the post-mating spermatophore. Smaller calcium deposits were detected in the central area of post-mating spermatophore, which contains the sperm mass, and in the extracellular matrix and capsule. While the density of calcium deposits decreased in the post-mating spermatozoon membranes, numerous small calcium deposits appeared in the subacrosomal zone and nucleus. Substantial changes in calcium deposit distribution in the crayfish spermatophore during post-mating storage on the body of female may be involved in the processes of the spermatophore hardening and spermatozoon maturation., (© 2016 Wiley Periodicals, Inc.)

Published
2016
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25. Comparative ultrastructure of the spermatozoa of three crayfish species: Austropotamobius torrentium, Pacifastacus leniusculus, and Astacus astacus (Decapoda: Astacidae).

Author

Niksirat H, Kouba A, Rodina M, and Kozák P

Subjects
Acrosome ultrastructure, Animals, Cell Nucleus ultrastructure, Male, Astacoidea classification, Astacoidea cytology, Spermatozoa ultrastructure
Abstract

This study reports about the spermatozoal ultrastructure of three species of astacid crayfish, i.e., the stone crayfish Austropotamobius torrentium, signal crayfish Pacifastacus leniusculus, and noble crayfish Astacus astacus. The acrosome is a cup shaped and electron-dense structure at the anterior of the spermatozoon and comprises three layers of differing electron densities filled with parallel filaments that extend from the base to the apical zone. The acrosome was significantly longer in A. astacus than in P. leniusculus and the shortest acrosome belongs to A. torrentium. The width of the acrosome was significantly narrower in A. torrentium than in P. leniusculus and the widest acrosome belongs to A. astacus. The L:W ratio was significantly greater in A. torrentium than in P. leniusculus and the lowest ratio belongs to A. astacus. Radial arms are visible on each side of the acrosome or nucleus in sagittal view and wrap around the spermatozoon. Each radial arm comprises a parallel bundle of microtubules arranged along the long axis within a sheath. The nucleus, with decondensed material, is located in the posterior of the cell. All parts of the spermatozoon are tightly enclosed within an extracellular capsule. Despite a well-conserved general structure and similarity of pattern among these spermatozoa, differences in the dimensions of the acrosome within the studied species may be useful to help distinguish the different crayfish species., (Copyright © 2013 Wiley Periodicals, Inc.)

Published
2013
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