Rigorous peer-reviews are the basis of high-quality academic publishing. Thanks to the great efforts of our reviewers Conservation was able to maintain its standards for the high quality of its published papers. Thanks to the contribution of our reviewers in 2021 the median time to first decision was 13 days and the median time to publication was 33 days. The editors would like to extend their gratitude and recognition to the following reviewers for their precious time and dedication regardless of whether the papers they reviewed were finally published:
| Ana Eusébio | Jose Jimenez |
| Andrea Sujová | José-Francisco Jiménez-Díaz |
| Andreia C. M. Rodrigues | Ju-Hyoung Lee |
| Andriy Novikov | Karen S. Oberhauser |
| Antonija Kulaš | Kinga Kostrakiewicz-Gierałt |
| Antonio Cubero-Hernández | Krisztián Frank |
| Behnaz Safar Ali Najar | Krzysztof Młynarczyk |
| Bishnu Hari Poudyal | Linas Balčiauskas |
| Blanca R. Lopez | Luis Da Costa |
| Budi Hadi Narendra | María Salinas |
| C. Sylvie Campagne | Mark C. Belk |
| Claudia Canedoli | Mary Jane Parmentier |
| Cristina Brito | Mauricio Hincapié |
| David Valenzuela-Galván | Michael John Dougherty |
| Emanuela Cicinelli | Mystera M. Samuelson |
| Emiliano Mori | Nan-Jay Su |
| Fabio Cianferoni | Natalya Ivanova |
| Fatmaelzahraa Hussein | Nowak Anna |
| Francesco Cerini | Olga V. Zaharova |
| Francesco Sica | Pankaj Kumar Gupta |
| Francisco Mateos Claros | Parisa Goker |
| Franz Krause | Parsa Arbab |
| George Poinar | Pawel Wolniewicz |
| Giovanni Bacaro | Pedro Mauricio Acosta Castellanos |
| Giuseppe Brundu | Phyllis C. Lee |
| Giuseppe Panarello | Piero Morseletto |
| Gregorio Vono | Roberto Amerigo Papini |
| Han Van Dobben | Roberto Carlucci |
| Ishwari Singh Bisht | Romina Alina Marc |
| Izabela Krupinska | Rositsa Yaneva |
| Jean Yves Heurtebise | Roxana Acosta Gutiérrez |
| Jeffrey C. F. Ho | Sabuj Kanti Majumder |
| Jiaying Shi | Shankar Adhikari |
| Jodi L. Sedlock | Vasilios Liordos |
| Jorge L. Ramirez | Yalan Liu |
| José Blanco-Salas |
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