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Age-Specific Survival and Reproductive Rates of Mediterranean Monk Seals at the Cabo Blanco Peninsula, West Africa

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Age-Specific Survival and Reproductive Rates of Mediterranean Monk Seals at the Cabo Blanco Peninsula, West Africa Vol. 45: 315–329, 2021 ENDANGERED SPECIES RESEARCH Published August 26 https://doi.org/10.3354/esr01134 Endang Species Res OPEN ACCESS Age-specific survival and reproductive rates of Mediterranean monk seals at the Cabo Blanco Peninsula, West Africa Pablo Fernández de Larrinoa1,*, Jason D. Baker2, Miguel A. Cedenilla1, Albert L. Harting3, Moulaye O. Haye1, Mercedes Muñoz4, Hamdy M’Bareck1, Abba M’Bareck1, Fernando Aparicio1, Soledad Centenera1, Luis M. González5 1Monk Seal Conservation Program, Fundación CBD-Habitat, 28002 Madrid, Spain 2National Oceanic and Atmospheric Administration, Pacific Islands Fisheries Science Center, Protected Species Division, Honolulu, HI 96818, USA 3Harting Biological Consulting, Bozeman, MT 59715, USA 4Center for Mediterranean Cooperation, International Union for Conservation of Nature, 29590 Malaga, Spain 5Subdirección General de Biodiversidad Terrestre y Marina, Ministerio para la Transición Ecológica y el Reto Demográfico, 28003 Madrid, Spain ABSTRACT: We provide the first complete set of survival rate estimates for the Endangered Mediterranean monk seal Monachus monachus from birth into adulthood, as well as the first age- specific reproductive rates for the species. From 2002 to 2016, we obtained individual seal live encounter data through non-invasive monitoring techniques that were analyzed to estimate vital rates of Mediterranean monk seals of the Cabo Blanco (Western Sahara/Mauritania) population. From birth to age 2 mo, when pups molt, survival averaged 0.59, ranging from 0.41 to 0.74 among cohorts. From birth to 1 yr and from 1 to 2 yr, median estimated survival rates were 0.46 and 0.75, respectively. Beyond 2 yr, survival estimates differed by sex: 0.94 for males and 0.97 for females. From 2005 to 2016, we estimated a mean gross reproductive rate of 0.71. The youngest parturient females were 3 yr old. Fitted age-specific reproductive rates increased beginning at age 3 yr and exceeded 0.80 from age 6 to 17 yr. Despite low survival during the first 2 mo of life, the aggregate vital rates of the population are favorable for growth; a Leslie matrix containing our survival and fecundity estimates yielded an intrinsic growth rate of 1.058. Increasing abundance and favorable vital rates are a testament to the efficacy of the many measures taken to promote the conservation of this population. KEY WORDS: Mediterranean monk seal · Monachus monachus · Survival rates · Reproductive rates · Fecundity · Cabo Blanco 1. INTRODUCTION applied conservation biology, including diagnosing declines and recovery planning (Caughley & Gunn Survival, fecundity, immigration, and emigration 1996, Dahlgren et al. 2016). Analysis of live encounter are the parameters that together determine popula- data from individually marked animals is a preferred tion abundance over time. Estimating these vital rates approach for estimating demographic parameters in and elucidating links between their covariation with wildlife populations (Sandercock 2006). intrinsic and extrinsic environmental para meters are The Endangered Mediterranean monk seal Mona - fundamental to applied population eco logy (Frederik - chus mona chus is the rarest species of pinniped; the sen et al. 2014). Evaluating vital rates also informs most recent published assessment reports that fewer © The authors and outside the USA the US Government 2021. *Corresponding author: Open Access under Creative Commons by Attribution Licence. Use, distribution and reproduction are un restricted. Authors and [email protected] original publication must be credited. Publisher: Inter-Research · www.int-res.com 316 Endang Species Res 45: 315–329, 2021 than 700 individuals remain (Karamanlidis et al. The Cabo Blanco seals almost exclusively come 2016). The seals almost exclusively come to shore to ashore on beaches inside 3 caves, all of which are rest, give birth, and nurse their pups inside sea caves, located along approximately 1 km of shoreline. They a behavior which has perhaps facilitated the species’ forage in nearby waters, and a no-fishing marine persistence. Although the range of the monk seal area is designated from the coast out to 12 nautical once encompassed the Black Sea, Mediterranean miles and encompassing approximately 28 nautical Sea, and the eastern Atlantic (including mainland miles of shoreline flanking the caves. Notwithstand- Africa and the oceanic island groups of Macaronesia), ing recent positive trends (Martínez-Jauregui et al. currently only 3 isolated subpopulations are known to 2012), the concentration of the entire population in remain (González 2015, Karamanlidis et al. 2016). In such a small range makes it vulnerable to a variety of the eastern Mediterranean, some 350−450 seals are threats. In 1997, a mass mortality event reduced the widely dispersed among islands and mainland coasts, population by about two-thirds from 317 to 109 indi- primarily in Greece and Turkey, but also in several viduals (Forcada et al. 1999). The cause(s) of the die- other countries (Gucu et al. 2009, Karamanlidis & off remain(s) undetermined, although leading hypo - Dendrinos 2015, Karamanlidis et al. 2019, Nicolaou et theses include biotoxin poisoning and a morbillivirus al. 2019, Fioravanti et al. 2020, Beton et al. 2021). In outbreak (Osterhaus et al. 1997, Hernández et al. the eastern Atlantic, 2 highly localized subpopulations 1998, Reyero et al.1999). Another such event could persist. Approximately 20 individuals reside in the recur at any time. On multiple occasions, all or por- Madeira Archipelago (R. Pires unpublished data), and tions of caves used by seals at Cabo Blanco have col- the largest single aggregation of monk seals (more lapsed, demonstrating the potential for these critical than 300 in total) occurs at Cabo Blanco, Western habitats to be degraded or entirely destroyed (Gon - Sahara/Mauritania (Fig. 1). Fortunately, there are in- zá lez et al. 1997). The caves are directly exposed to dications that all 3 subpopulations may be increasing episodic heavy surf and high tides, which contribute in abundance to some degree (Karamanlidis & Den- to high mortality of young pups (Gazo et al. 2000). drinos 2015). The monk seal caves are situated just 7 km from 17º00’ 16º50’W Nouadhibou, a rapidly growing commercial center with a population of over 100 000. Both local artisanal and large-scale modern foreign fishing fleets operate MAURITANIA in the waters adjacent to Cabo Blanco peninsula 21º10’ (Belhabib et al. 2012). This proximity makes the Cabo Blanco monk seals vulnerable to increasing direct and indirect human impacts such as pollution, Cabo Corveiro 67 km active fishery bycatch, and debris entanglement. The shocking losses that occurred during the 1997 mass mortality prompted the development of a plan Breeding for the recovery of the monk seal in the eastern At lan - caves Costa de las Focas tic coordinated by 4 countries: Mauritania, Moroc co, 20º59’ Spain, and Portugal (González et al. 2006). The Action MAURITANIA Plan called for conservation, research, and monitoring Nouadhibou objectives. These included estimating demographic parameters, such as productivity and age-specific sur- vival. Following the mass mortality, the Cabo Blanco monk seal population has rebounded impressively, no doubt in part due to the protections afforded under the Action Plan (Martínez-Jauregui et al. 2012). 20º50’S Pinniped demographic studies typically rely on applied flipper tags or, less commonly, branding to mark individuals (Loughlin et al. 2010). A few re - Cabo Blanco 6 km search programs have used photographic identifica- tion based on persistent natural marks (usually be - cause capturing a sufficient sample of study subjects Fig. 1. Cabo Blanco peninsula, showing the area known as Costa de las Focas (Seal Coast), the location of the breeding to apply marks is infeasible) to estimate seal abun- caves, and the city of Nouadhibou dance or vital rates (Mackey et al. 2008, Koivuniemi et Fernández de Larrinoa et al.: Mediterranean monk seal vital rates 317 al. 2019). The perilous status of the Cabo Blanco monk of reproductive-age females used to estimate birth seal population following the 1997 mass mortality, rates. In this study, we analyzed more than a decade coupled with known negative im pacts of human dis- of live encounter data to estimate vital rates of Medi- turbance on the species throughout its range, terranean monk seals at Cabo Blanco, encompassing prompted the 2006 Action Plan to emphasize hands- a period of population increase and enhanced con- off methods. Specifically, ‘For population monitoring servation measures under the Action Plan. We pro- and studies of monk seal biology, non-invasive tech- vide the first complete set of survival rate estimates niques shall be used, avoiding actions that would in- for Mediterranean monk seals from birth into adult- volve disturbance to seals at breeding and resting hood, and the first estimates of age-specific repro- sites’ (González et al. 2006, p. 235). Photographic iden- ductive rates for the species. tification techniques had already been developed for studying monk seals at Cabo Blanco prior to the mass mortality event (Forcada & Aguilar 2000), and were 2. METHODS further refined and used almost exclusively for ob- taining individual resighting histories thereafter. 2.1. Study area and surveillance methods Most published estimates of Mediterranean monk seal survival and reproductive rates have been based The coastline from Cabo Corveiro (21° 48’ N, on research at Cabo Blanco, which has long been the 16° 58’ W) to Cabo Blanco (20° 46’ N, 17° 03’ W), West- only colony with a sizeable population concentrated ern Sahara/Mauritania, comprises cliff and sandy in a small area with the potential for observation and beach sections. Seals move along this entire coast but collection of live encounter data. Key findings of the almost exclusively come ashore inside 3 caves at the studies published to date (Table 1) were that early south end of the cliff area known as Costa de las pup survival is relatively low compared to other pin- Focas (21° 02’ N, 17° 03’ W), on the west coast of the nipeds, whereas seals older than 2.5 yr showed high Cabo Blanco pen insula (Fig.
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