- Marine Record
- Open Access
First record of the predatory snail Acanthinucella spirata (Blainville, 1832) north of its known range
© The Author(s) 2018
- Received: 25 May 2018
- Accepted: 30 August 2018
- Published: 12 September 2018
Rapidly changing marine environments have increased the need to document the expansion of organismal ranges into new, previously undocumented regions. Such range expansions can shed light on the ecological factors that promote successful spread and establishment of species in new areas, and the evolutionary processes that may lead to adaptations. Acanthinucella spirata (Blainville, 1832) is a muricid gastropod that has expanded its range northward along the California coast since the Pleistocene. Its previously documented range was from Tomales Bay, California (38.2°N), to Punta Baja, Baja California (22.9°N). Here we report the first record of A. spirata north of its previously defined range, along the Californian coast of North America.
Populations of reproducing muricid gastropods were found during a survey of the high intertidal zone of a moderately wave-protected boulder field on Cape Mendocino, CA (Latitude 40.396°N Longitude − 124.378°W) on 17 June 2017. A sample of 65 individual snails were haphazardly collected and digitally photographed, weighed, and measured. Photos and morphological data were used to key individuals to species, and we used shell shape to compare collected snails to suspected Acanthinucella species and with potential source populations.
Snails were positively identified as A. spirata, roughly 431 km north of this species’ previously defined northern range limit. Snails had a mean shell length of 28.32 mm (± 3.0 s.d.) and a mean mass of 4.23 g (± 1.1 s.d.).
Due to A. spirata’s non-planktonic larval stage, hitchhiking on avian hosts or rafting are the likely causes for the northward non-contiguous dispersal of the species, especially because populations have not been reported between new and previously defined range boundaries. Such stratified range expansions, which occur via a combination of both contiguous and non-contiguous dispersal, are consistent with several recent studies documenting present-day range expansions.
- Angular Unicorn
- Northern California
- Range expansion
- Stratified dispersal
Over the last century, human activities, such as fossil fuel combustion and greenhouse gas emissions have led to accelerating global climate change, including atmospheric and oceanic warming (IPCC 2014). These human-induced changes to global climates have led to poleward range expansions in numerous organisms (Parmesan and Yohe 2003; Hickling et al. 2006; Parmesan 2006; Chen et al. 2011). Although modern range shifts have been documented in marine systems (e.g. Perry et al. 2005; Ling et al. 2009; Johnson et al. 2011; Yamano et al. 2011), they have traditionally received less study than terrestrial systems (but see Sorte et al. 2010; Wernberg et al. 2011; Sunday et al. 2012; for recent reviews of modern marine range expansions).
Both anthropogenically-mediated and natural range expansions share similar processes and dynamics that bring species into contact with new habitats, new ecological communities, and novel selective pressures (Roy et al. 2002; Sorte et al. 2010). As expanding species encounter novel environments, present-day range expansions can provide insight into the ecological factors that promote successful establishment in new locations, and the evolutionary processes that may lead to adaptations (van Kleunen et al. 2010; Westley 2011). For example, range expansions can occur through contiguous dispersal where a population expands into adjacent habitats over short distances, or by noncontiguous dispersal, where a population expands into non-adjacent habitats over long distances (Shigesada et al. 1995; Berthouly-Salazar et al. 2013). The latter is usually accomplished via rare long-distance natural dispersal events, or facilitated by anthropogenic activities. Recent studies have indicated that range expansions often occur by a combination of both mechanisms; so-called ‘stratified dispersal’ (Darling and Folino-Rorem 2009; Bronnenhuber et al. 2011). These dispersal mechanisms are known to affect genetic structure between established populations, while also producing distinctive patterns of genetic differentiation during range expansion (Shigesada et al. 1995; Ramakrishnan et al. 2010).
Whereas dispersal is necessary for range expansion, so too is the ability to respond to novel environments encountered at the range edge. Expansion into new environments exposes range-expanding species to a suite of novel abiotic and biotic selective pressures (Sakai et al. 2001). Consequently, there is a need to document present-day range expansions, while integrating information about expansion history, dispersal ability, and novel environments to better understand the factors influencing range expansions (e.g., Pfeiffer-Herbert et al. 2007) and better predict potential future range expansions of marine species (Connolly and Baird 2010).
Class GASTROPODA Cuvier, 1795.
Subclass CAENOGASTROPODA Cox, 1960.
Order NEOGASTROPODA Wenz, 1938.
Superfamily MURICOIDEA Rafinesque, 1815.
Family MURICIDAE Rafinesque, 1815.
Subfamily OCENEBRINAE Cossmann, 1903.
Genus Acanthinucella Cooke, 1918.
Acanthinucella spirata Blainville, 1832.
Acanthinucella spirata has not been previously documented north of Tomales Bay, CA (latitude 38.17°N). However, the population we observed during our survey was of considerable density and was actively reproducing, indicating that latitude 40.40°N, along the northern California coast, is this species new northern boundary.
Effective dispersal is necessary for colonizing new habitat beyond a species current range. For A. spirata, a species with intracapsular development, with crawl-away young (Spight 1976), viable options for long-distance dispersal along the California coast are limited (Gibson et al. 2006). However, the absence of documented pocket populations between the new population we document here (40.40°N) and the previously established northern range limit (38.17°N) indicates noncontiguous dispersal or a ‘jump’ range expansion. Given the remote location of Cape Mendocino, this was likely due to a rare long-distance natural dispersal event, rather than mediated by anthropogenic vectors. We hypothesize long-distance avian-mediated dispersal (Green and Figuerola 2005) or rafting on organic or inorganic material (Thiel and Gutow 2005) as the dispersal mechanism for the present A. spirata range expansion. Our finding of noncontiguous northward dispersal, coupled with the climate-driven poleward range expansion over geological time suggest that A. spirata’s poleward range expansion might have been a combination of both contiguous and non-contigous dispersal, a mechanism for range expansion that has been documented in other species in several recent studies (Shigesada et al. 1995; Shigesada and Kawasaki 2002; Berthouly-Salazar et al. 2013).
The introduction of a novel species to a new geographic location generally has negative effects on native species (Ricciardi 1998; Cullingham et al. 2011) and A. spirata’s range expansion into the northern California coast could pose a novel threat to the ecology of native intertidal communities. In its previously-documented range, A. spirata is distributed throughout the mid- and high-intertidal zones on rocky shores. As a generalist predator, it feeds naturally on two intertidal foundation species (barnacles, Balanus glandula and mussels, Mytilus californianus); a common herbivore (the black turban snail, Tegula funebralis); and sporadically on other taxa (Murdoch 1969; Ferrier et al. 2016); however, it prefers barnacles over mussels and turban snails (Zimmer et al. 2016). B. glandula and another barnacle species, Chthamalus dalli, are found locally on Cape Mendocino, and because A. spirata can modify competitive hierarchies, and determine population dynamics and species composition among barnacle assemblages (Lively et al. 1993; Ferrier et al. 2016), it could have significant impacts on community structure in its new location. Further, because barnacles are a shared resource among native muricid snails, Nucella lamellosa (Gmelin, 1791), Nucella ostrina (Gould, 1852), and Ceratostoma foliatum (Gmelin, 1791), on Cape Mendocino, the presence of high-density, reproducing populations of A. spirata could cause a shift in native predatory snail assemblages via reductions in barnacle populations, altering local community structure. Monitoring the integration of A. spirata into the rocky shore communities at the northern edge of its distribution could therefore provide valuable insight into the community dynamic shifts associated with species introductions and range expansions.
Non-contiguous dispersal, like that documented here, is known to produce characteristic patterns of genetic variation during range expansion (Shigesada et al. 1995; Ramakrishnan et al. 2010) and may profoundly affect evolutionary change, by providing new environmental contexts that can create novel ecological interactions, select for new morphologies, and even lead to speciation (Parmesan 2006; Ruiz et al. 1997; Strayer et al. 2006). Populations with relatively high levels of standing genetic variation should be better at resisting founder effects and adapt to new environments (Lee 2002; Bock et al. 2015; Schlaepfer et al. 2005). However, genetic bottlenecks and genetic drift in small founding populations will act to reduce a population’s genetic diversity and adaptive potential (Klopfstein et al. 2005; Peacock et al. 2009). In its previously documented range, northern populations (between 34.5° and 40°N latitude) of A. spirata show reduced genetic diversity relative to southern populations, a pattern consistent with a recent northward range expansion (Hellberg et al. 2001). Future studies should examine patterns of genetic variation in founding populations of A. spirata on Cape Mendocino to determine their potential to adapt to their new northern range limit.
We thank the director and staff of the Humboldt State University Telonicher Marine Laboratory for logistical support. We thank T. McClure for making the map used in Fig. 1. Organisms were collected by the authors under scientific collecting permit # SCP 10571 to PEB from the California Department of Fish and Wildlife. Carlo Nike Bianchi and 2 anonymous reviewers provided constructive criticism on earlier versions of this manuscript. This is a contribution of the Humboldt State University Telonicher Marine Laboratory and the Humboldt Marine and Coastal Sciences Institute.
PEB acknowledges support from The California State University Council on Ocean Affairs, Science & Technology (CSU- COAST) Grant Development Program.
Availability of data and materials
All data generated or analyzed during this study are included in this published article [and its supplementary information files].
TEF initiated the study and collected and analyzed the data. TEF and PEB identified the specimens. TEF photographed the specimens. TEF wrote the original draft of the manuscript, which PEB reviewed and critically revised. Both authors read and approved the final manuscript.
Ethics approval and consent to participate
This work conforms to the legal requirements of the county in which it was carried out and to accepted international ethical standards, including those relating to conservation and animal welfare.
Consent for publication
The authors declare that they have no competing interests.
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