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Vocal Behavior of the Endangered Splendid Toadfish and Potential Masking by Anthropogenic Noise

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Received: 1 June 2020 Revised: 30 November 2020 Accepted: 3 December 2020 DOI: 10.1111/csp2.352 CONTRIBUTED PAPER Vocal behavior of the endangered splendid toadfish and potential masking by anthropogenic noise Cynthia D. Pyc1 | Jonathan Vallarta2 | Aaron N. Rice3 | David G. Zeddies4 | Emily E. Maxner5 | Samuel L. Denes4 1JASCO Applied Sciences (Canada) Ltd, Victoria, British Columbia, Canada Abstract 2PAMOS, Mexico City, Mexico Vessel-related noise is a potential stressor for coral reef fauna. The Parque 3Center for Conservation Bioacoustics, Nacional Arrecifes de Cozumel (PNAC) is a Mexican Marine Protected Area Cornell Lab of Ornithology, Cornell that is exposed to pervasive vessel traffic. PNAC is also the primary range of University, Ithaca, New York splendid toadfish (Sanopus splendidus, family Batrachoididae), an IUCN red- 4JASCO Applied Sciences (USA) Inc, Silver Spring, Maryland listed soniferous fish for which vessel noise may represent a threat. We con- 5JASCO Applied Sciences (Canada) Ltd, ducted a passive acoustic monitoring survey during summer of 2017 at Paraiso Dartmouth, Nova Scotia, Canada Reef in PNAC and obtained the first scientific recordings from splendid toad- fish, enabling a vocal characterization of the species. We simultaneously col- Correspondence Cynthia D. Pyc, JASCO Applied Sciences lected data on sound levels of vessels passing near the reef. High noise levels of (Canada) Ltd, Victoria, British Columbia cruise ship and small motorboat traffic caused elevated anthropogenic sound V8Z 7X8, Canada. pressure levels for up to 15 hr per day in the same bandwidth as toadfish vocal- Email: [email protected] izations. A single cruise ship added up to 4 dB above nighttime ambient levels Funding information while small motorboat traffic added up to 7 dB. The overlap of toadfish vocali- JASCO Applied Sciences zations and vessel-related noise highlights the susceptibility of splendid toad- fish to acoustic masking and reduction in communication space throughout the day, warranting further study. Because acoustic communication is critical to toadfish reproductive success, noise from cruise ships and small motorboats may threaten splendid toadfish individuals or population viability. KEYWORDS acoustic masking, coral reef, passive acoustic monitoring, soundscape, toadfish 1 | INTRODUCTION declines in condition and function from cumulative stressors including coral disease, overfishing, tourism, Cozumel, Mexico has been a popular tourist destination marine pollution, sedimentation, and climate change for several decades, with diving, recreational fishing, and (Hughes et al., 2017; Lapointe, Brewton, Herren, Porter, cruise travel comprising most of the island's economy. & Hu, 2019; Suchley & Alvarez-Filip, 2018). Continued tourism to Cozumel is dependent on a healthy An additional stressor to reef fauna is anthropogenic and biologically diverse reef ecosystem. However, reefs noise pollution. Several reviews have summarized the worldwide, including those in Cozumel, are experiencing potential effect of vessel noise on fishes (e.g., de Jong This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. © 2021 JASCO Applied Sciences. Conservation Science and Practice published by Wiley Periodicals LLC on behalf of Society for Conservation Biology Conservation Science and Practice. 2021;e352. wileyonlinelibrary.com/journal/csp2 1of15 https://doi.org/10.1111/csp2.352 2of15 PYC ET AL. et al., 2020; Mickle & Higgs, 2017; Popper & Haw- Reefs National Park (Parque Nacional Arrecifes de Cozu- kins, 2019; Radford, Kerridge, & Simpson, 2014; mel [PNAC]) (CONANP and SEMARNAT, 2019). Cozu- Slabbekoorn et al., 2010) with some empirical studies mel reefs have already suffered from intense fishing focusing specifically on the impact of noise on reef fishes activities and are under increasing pressure from this (e.g., Holles, Simpson, Radford, Berten, & Lecchini, 2013; tourism. In just 27 years (1984–2011) live coral cover off Holmes, McWilliam, Ferrari, & McCormick, 2017; Cozumel declined by 13% due to impacts from tourists, Kaplan & Mooney, 2015; McCormick, Allan, Harding, & small motorboat pollution, and other anthropogenic Simpson, 2018; Nedelec et al., 2017; Staaterman threats compared to an average coral cover decrease of et al., 2020; Velasquez Jimenez, Fakan, & McCor- 11% on the Mesoamerican Barrier Reef (Jackson, Dono- mick, 2020). The results of these studies of reef fishes' van, Cramer, & Lam, 2014; Wilkinson, 2008; Wilkinson response to sound exposure from vessel noise are highly & Souter, 2008). variable. Regular baseline monitoring of the health of While the principle concerns of anthropogenic noise Cozumel's extensive reefs is currently led by locally based impacts to fishes include altered perception and produc- CONANP staff. Since 2004, scientists have conducted tion of sounds (Popper & Hawkins, 2019), such as mas- monthly physicochemical monitoring at 11 reef sites and king (Putland, Merchant, Farcas, & Radford, 2018; traditional photo-transect monitoring every 6 months at Vasconcelos, Amorim, & Ladich, 2007), an emerging six reef locations to measure the percentage of coral cover body of the literature has recently demonstrated and to count and photo identify fish and benthic species responses to noise outside of direct auditory or communi- present at each site (CONANP, 2020; Garcia Salgado cative contexts, including developmental changes (Fakan et al., 2008; Gress, Arroyo-Gerez, Wright, & Andradi- & McCormick, 2019), increased stress, altered foraging Brown, 2018). Additional site-specific photogrammetry (Magnhagen, Johansson, & Sigray, 2017), disrupted studies documenting coral assemblages were conducted schooling (Sarà et al., 2007), and increased susceptibility in 2018 in PNAC (Hernández-Landa, Barrera-Falcon, & to predation (Simpson et al., 2016; Simpson, Purser, & Rioja-Nieto, 2020). These types of surveys are time and Radford, 2015). The diversity of possible vessel noise labor intensive, limited to depths accessible to human effects on fishes suggests that more urgent study is divers, and rarely conducted at night. Diver surveys needed to understand the consequences of high vessel focused on marine fauna frequently overlook cryptic or traffic on coral reefs and their associated fauna. nocturnally active species such as toadfish, and species that may be correlated with reef health such as snapping shrimp (Sale, 1997; Willis, 2001). Diver surveys can also 1.1 | Monitoring the health of Cozumel's introduce sampling error and bias associated with behav- coral reefs ioral responses of marine fauna to human presence (Pais & Cabral, 2018). While providing a basic understanding Recent years have seen an increase in the number of of reef health, visual surveys do not account for all poten- cruise ships visiting Cozumel island, particularly after the tial impact producing factors, specifically noise, on completion of a third cruise ship terminal in 2015, which marine fauna. made Cozumel the second busiest cruise port in the An alternative method to visual surveys for monitor- world (Caribbean Journal staff, 2014; Mexico News ing specific species, and overall coral reef health while Daily, 2019; OECD, 2017). In the 2017/2018 cruise year, also measuring anthropogenic noise pollution, is nonin- Cozumel received over a thousand cruise ships with an vasive, passive acoustic monitoring (PAM) of the reef estimated 4.1 million passengers, and up to eight ships soundscape (e.g., Bertucci et al., 2020; Lindseth & per day, an increase of approximately 40% from 2014 to Lobel, 2018; McWilliam, McCauley, Erbe, & Par- 2015 (Business Research and Economic Advisors, 2018; sons, 2017; Mooney et al., 2020; Nedelec et al., 2015; CONANP, 2016; Port Administration of Quintana Roo Staaterman, Rice, Mann, & Paris, 2013). PAM enables APIQROO, 2017; Secretaría de Medio Ambiente y access to a greater range of habitats than traditional Recursos Naturales, 2016; Secretaría de Turismo, 2015). diversity sampling methods, is less labor intensive, pro- Data related to dive tourism are more difficult to find and vides more extensive temporal resolution, and is more quantify, but internet searches resulted in the identifica- easily conducted over large spatial and temporal scales tion of hundreds of companies offering SCUBA dive trips (Sueur, Pavoine, Hamerlynck, & Duvail, 2008). Several in Cozumel. In September 2019 there were 243 boats, studies conducted at various locations (e.g., Australia, each carrying a maximum number of 60 passengers, with New Zealand, French Polynesia, and the U.S. Virgin permits from the National Commission of Natural Islands) in the past decade have focused on reef-gener- Protected Areas Mexico (CONANP) to enter the Cozumel ated sound as an indicator of reef health (summarized in PYC ET AL. 3of15 Mooney et al., 2020). Some of these studies have used Union for the Conservation of Nature (IUCN) (Collette, ecoacoustic (soundscape) indices with mixed success (e. Aiken, & Polanco Fernandez, 2015). The splendid g., Bertucci, Parmentier, Lecellier, Hawkins, & toadfish's endangered status is based on an estimated Lecchini, 2016; Kaplan, Mooney, Partan, & Solow, 2015; area of occupancy that is less than 500 km2 (IUCN esti- Kennedy, Holderied, Mair, Guzman, & Simpson, 2010). mates it as ~109 km2) and is severely fragmented or lim- A small subset of acoustic-focused reef biodiversity
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