DOCSLIB.ORG

Nucella Ostrina Class: Gastropoda, Prosobranchia Order: Neogastropoda the Rock-Dwelling Emarginated Dogwinkle Family: Thaisidae

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Nucella Ostrina Class: Gastropoda, Prosobranchia Order: Neogastropoda the Rock-Dwelling Emarginated Dogwinkle Family: Thaisidae Phylum: Mollusca Nucella ostrina Class: Gastropoda, Prosobranchia Order: Neogastropoda The rock-dwelling emarginated dogwinkle Family: Thaisidae Taxonomy: Nucella was previously called Sutures: Not deep (Fig. 1). Thais. Thais is now reserved for subtropical Anterior (Siphonal) Canal: Short: less than and tropical species. For a more detailed 1/4 aperture length: species ostrina (Kozloff review of gastropod taxonomy, see Keen and 1974) (Fig. 1); canal narrow, slot-like, not Coan (1974) and McLean (2007). Nucella. spout-like; not separated from large whorl by ostrina has mistakenly been called N. revolving groove. emarginata though it has now been found that Aperture: Wide; length more than 1/2 shell the two species diverged in the late length (Oldroyd 1924). Ovate in outline, with a Pleistocene epoch (Marko et al. 2003) short anterior canal but no posterior notch (Fig. 1). Description Umbilicus: Closed (McLean 2007). Size: Rarely over 30 mm (Kozloff 1974), Operculum: Dark brown with nucleus on one usually up to 20 mm (Puget Sound); up to 40 side (Fig. 2). mm, but rarely over 30 mm (California) Eggs: Pale yellow, vase-shaped, about 6 (Abbott and Haderlie 1980); illustrated mm high, in clusters of up to 300 capsules specimen (Coos Bay) 20 mm. Females (Abbott and Haderlie 1980) (Fig. 4). Each slightly larger than males (average 18.9 and capsule with 500-600 eggs. Each capsule 17.8) (Houston 1971). with a longitudinal suture and a hard clear Color: Exterior brown and dingy white, dirty escape aperture. gray, yellow or almost black (if diet of Veliger: Four distinct stages: advanced shell mussels); yellow, black or gray periostracum measures 775µ long (LeBoeuf 1971) (Fig. 5). in grooves between ridges; ridges sometimes white (black in this specimen). Interior: Possible Misidentifications aperture and columella chestnut brown or Snails of the genus Nucella can be purple. distinguished from other carnivorous Shell Shape: Fusiform; short spire, estuarine gastropods by their sculpture (the expanded whorl. Shell thin, not heavy. 3-4 same on both spire and whorls), by the large whorls; nuclear whorl inconspicuous. body whorl and by the large ovate aperture. Sculpture: Spire relatively high, partial nub Other genera with a siphonal notch, and of aperture lacking (McLean 2007); generally fusiform shape include: alternating large and small spiral ridges over Olivella and Buccinum, which have most of shell, can be nodulose; sometimes columellar folds; ridges are obscure and surface is fairly Ocenebra and Ceratostoma which have a smooth. Axial sculpture wrinkled, not spout-like siphonal canal, not a narrow-slot- prominent. like one as in Nucella; Outer Lip: Thin, crenulate, not thick and Tritia reticulata and Lirabuccinum dirum layered (Oldroyd 1924). No denticles or anal which have a distinct revolving furrow or fossa notch on posterior (upper) end, no single setting off the anterior canal from the body strong tooth near anterior canal. No row(s) or denticles within lip. whorl; (Lirabuccinum has spiral sculpture only Columella: Sunken and concave, arched and on the body whorl; the spire has both spiral flattened below: species ostrina; no folds, and axial ribs); (Fig. 1). Bering, N., T. Hext and E. Parker. 2017. Nucella ostrina. In: Oregon Estuarine Invertebrates: Rudys' Illustrated Guide to Common Species, 3rd ed. T.C. Hiebert, B.A. Butler and A.L. Shanks (eds.). University of Oregon Libraries and Oregon Institute of Marine Biology, Charleston, OR. A publication of the University of Oregon Libraries and the Oregon Institute of Marine Biology Individual species: http://hdl.handle.net/1794/12914 and full 3rd edition: http://hdl.handle.net/1794/18839 Email corrections to: [email protected] Acanthina (also from the family Thaisidae), they are morphologically cryptic. See Marko which has a strong tooth on the anterior end et al. (2003) for a more detailed discussion. of the outer lip. There are three other species of Nucella in Ecological Information our area. Two are not typically found in Range: Bering Sea south to northern Baja estuarine conditions, but they do look quite a California, but rare below Pt. Conception bit like N. ostrina: (Abbott and Haderlie 1980). Nucella lima, the file dogwinkle, is subtidal, Local Distribution: Coos Bay: marine short-spired, and fairly rare. It is whitish to portions, i.e. near bay mouth up to Fossil brown, with about 15 alternating large and Point. small file-like spiral ridges on the large whorl. Habitat: Almost entirely on rocky shores; in It can be up to 43 mm, somewhat larger than fairly heavy surf (Ricketts and Calvin 1971); N. ostrina. also in semi-protected areas (Houston 1971). Nucella canaliculata, the channeled Outer shores in mussel beds, on jetties. dogwhelk, has a high spire and a prominent Salinity: Full seawater; collected at 30. shoulder below the deep suture. It is light Temperature: Cold to temperate waters: (white to orange), and sometimes banded. Its small animals high in tidal range show great 14-16 spiral ridges are very evenly shaped thermal resistance, active at range of 0-30°C and spaced. It is an inhabitant of outer shore (Bertness and Schneider 1976). mussel beds. Larger than N. ostrina, it Tidal Level: Ubiquitous intertidal predators, averages 26.5 mm (male) and 24.8 mm found from mid to high intertidal zones (Moran (female) (California) (Houston 1971). and Emlet 2001). The third species, Nucella lamellosa (see Associates: Primary prey is barnacles, description in this guide), is the most common especially Balanus; mussel Mytilus; Pisaster dogwinkle in the northwest, quite common in ochraceus. Commensal flatworm Nexilis bays and estuaries, and one of its many epichitonius found in specimens on Coos Bay variations is very like N. ostrina. N. lamellosa entrance jetty (Holliman and Hand 1962). can have strong axial ruffles, be quite smooth, Weight: 1.5 gm (wet). or have strong horizontal ribs. In this last Abundance: Common to abundant (McLean case, it is difficult to distinguish from N. 2007); much less common in inner bay than ostrina. N. lamellosa has a higher spire N. lamellosa (Coos Bay). (usually 5-7 whorls, including the tiny nuclear whorl); it is heavy, with a thick-layered lip, not Life History Information a thin crenulated one. There is usually at least Reproduction: Found to spawn year-round in one row of denticles inside the lip in N. Bodega Bay, Calif. and throughout Oregon, lamellosa; its anterior canal is longer than that but most activity is in November-February. of N. ostrina (more than 1/4 aperture length). Little hermaphroditism (Houston 1971). While N. lamellosa can have strong spiral Spawning is not salinity, photoperiod or ridges, the body whorl in this species is then temperature-related (Houston 1971). Females often flattened and angled, not expanded as gregarious (groups to 20), deposit egg in N. ostrina, and the horizontal ridges capsules in clusters. Each female lays 8-9 themselves are not alternating large and capsules; stalked capsules have about 200- small (compare Fig. 2, N. lamellosa in this 300 eggs each (ibid), many of which may be guide). Nucella lamellosa inhabits much sterile nurse eggs which are consumed by quieter waters, as a rule, and a lower tidal developing larvae. Veligers swim in capsule range than does N. ostrina. Its color is usually fluid and metamorphose into snails about 1.1 lighter; it is rarely blackish. mm long, emerging from plug at top of A fourth species of Nucella, Nucella capsule (ibid). Pacific Northwest hatchlings emarginata though not found in our area can number about 10-20 per capsule average; easily be confused with N. ostrina because Bodega Bay about 5% hatch (10-15) (ibid). Bering, N., T. Hext and E. Parker. 2017. Nucella ostrina. In: Oregon Estuarine Invertebrates: Rudys' Illustrated Guide to Common Species, 3rd ed. T.C. Hiebert, B.A. Butler and A.L. Shanks (eds.). University of Oregon Libraries and Oregon Institute of Marine Biology, Charleston, OR. Growth Rate: Pacific Northwest: 2.5-3 commensal with mollusks. The Veliger. months from egg deposition to hatching; 5:20-22. possibly more rapid development farther 5. HOUSTON, R. S. 1971. Reproductive south (Abbott and Haderlie 1980). biology of Thais emarginata (Deshayes Longevity: 5-10 years (Dawson et al. 2014). 1839) and Thais canaliculata (Duclos Food: Prefers mussels Mytilus edulis and M. 1832). The Veliger. 13:348-357 californianus; also barnacles Balanus, 6. KEEN, A. M. and E.V. COAN. 1974. Pollicipes, Chthamalus; limpet Lottia, as well Marine molluscan genera of Western as herbivorous gastropods Tegula funebralis North America; an illustrated key. 2d ed. and Littorina. Feeding is by drilling with the Stanford, Calif.: Stanford University Press. radula, inserting the proboscis, and feeding 7. KOZLOFF, E.N. 1974. Keys to the marine on the soft body within. Species N. ostrina invertebrates of Puget Sound, the San shows a wide food preference, but individuals Juan Archipelago, and adjacent regions. seem to be consistent in diet (Abbott and University of Washington Press, Seattle & Haderlie 1980). London. Predators: Cancer oregonensis. Adult snails 8. LEBOEUF, R. 1971. Thais emarginata prey on eggs. (Deshayes): Description of the veliger and Behavior: Presence of N. ostrina elicits egg capsule. The Veliger. 14:205-211. several escape responses from prey Mytilus 9. MARKO, P. B., PALMER, A. R., and edulis: gaping, spontaneous valve closure, VERMEIJ, G. J. 2003. Resurrection of foot activity, byssal fixing (Wayne 1980). Nucella ostrina (Gould, 1852), lectotype Increase in air temperature reduces predation designation for N, emarginata (Deshayes, rate of Nucella ostrina on Balanus glandula 1839), and molecular genetic evidence of while an increase in submerged body Pleistocene speciation. The Veliger. temperature results in an increase in 46:77-85. predation rate (Yamane and Gilman 2009). 10. MCLEAN, J.H. 2007. Shelled gastropoda, p. 713-753. In: The Light and Smith Literature Cited manual: intertidal invertebrates from 1.
Load more

Recommended publications
  • GASTROPOD CARE SOP# = Moll3 PURPOSE: to Describe Methods Of
    GASTROPOD CARE SOP# = Moll3 PURPOSE: To describe methods of care for gastropods. POLICY: To provide optimum care for all animals. RESPONSIBILITY: Collector and user of the animals. If these are not the same person, the user takes over responsibility of the animals as soon as the animals have arrived on station. IDENTIFICATION: Common Name Scientific Name Identifying Characteristics Blue topsnail Calliostoma - Whorls are sculptured spirally with alternating ligatum light ridges and pinkish-brown furrows - Height reaches a little more than 2cm and is a bit greater than the width -There is no opening in the base of the shell near its center (umbilicus) Purple-ringed Calliostoma - Alternating whorls of orange and fluorescent topsnail annulatum purple make for spectacular colouration - The apex is sharply pointed - The foot is bright orange - They are often found amongst hydroids which are one of their food sources - These snails are up to 4cm across Leafy Ceratostoma - Spiral ridges on shell hornmouth foliatum - Three lengthwise frills - Frills vary, but are generally discontinuous and look unfinished - They reach a length of about 8cm Rough keyhole Diodora aspera - Likely to be found in the intertidal region limpet - Have a single apical aperture to allow water to exit - Reach a length of about 5 cm Limpet Lottia sp - This genus covers quite a few species of limpets, at least 4 of them are commonly found near BMSC - Different Lottia species vary greatly in appearance - See Eugene N. Kozloff’s book, “Seashore Life of the Northern Pacific Coast” for in depth descriptions of individual species Limpet Tectura sp. - This genus covers quite a few species of limpets, at least 6 of them are commonly found near BMSC - Different Tectura species vary greatly in appearance - See Eugene N.
    [Show full text]
  • Marine Invertebrate Field Guide
    Marine Invertebrate Field Guide Contents ANEMONES ....................................................................................................................................................................................... 2 AGGREGATING ANEMONE (ANTHOPLEURA ELEGANTISSIMA) ............................................................................................................................... 2 BROODING ANEMONE (EPIACTIS PROLIFERA) ................................................................................................................................................... 2 CHRISTMAS ANEMONE (URTICINA CRASSICORNIS) ............................................................................................................................................ 3 PLUMOSE ANEMONE (METRIDIUM SENILE) ..................................................................................................................................................... 3 BARNACLES ....................................................................................................................................................................................... 4 ACORN BARNACLE (BALANUS GLANDULA) ....................................................................................................................................................... 4 HAYSTACK BARNACLE (SEMIBALANUS CARIOSUS) .............................................................................................................................................. 4 CHITONS ...........................................................................................................................................................................................
    [Show full text]
  • Download Download
    Appendix C: An Analysis of Three Shellfish Assemblages from Tsʼishaa, Site DfSi-16 (204T), Benson Island, Pacific Rim National Park Reserve of Canada by Ian D. Sumpter Cultural Resource Services, Western Canada Service Centre, Parks Canada Agency, Victoria, B.C. Introduction column sampling, plus a second shell data collect- ing method, hand-collection/screen sampling, were This report describes and analyzes marine shellfish used to recover seven shellfish data sets for investi- recovered from three archaeological excavation gating the siteʼs invertebrate materials. The analysis units at the Tseshaht village of Tsʼishaa (DfSi-16). reported here focuses on three column assemblages The mollusc materials were collected from two collected by the researcher during the 1999 (Unit different areas investigated in 1999 and 2001. The S14–16/W25–27) and 2001 (Units S56–57/W50– source areas are located within the village proper 52, S62–64/W62–64) excavations only. and on an elevated landform positioned behind the village. The two areas contain stratified cultural Procedures and Methods of Quantification and deposits dating to the late and middle Holocene Identification periods, respectively. With an emphasis on mollusc species identifica- The primary purpose of collecting and examining tion and quantification, this preliminary analysis the Tsʼishaa shellfish remains was to sample, iden- examines discarded shellfood remains that were tify, and quantify the marine invertebrate species collected and processed by the site occupants for each major stratigraphic layer. Sets of quantita- for approximately 5,000 years. The data, when tive information were compiled through out the reviewed together with the recovered vertebrate analysis in order to accomplish these objectives.
    [Show full text]
  • DEEP SEA LEBANON RESULTS of the 2016 EXPEDITION EXPLORING SUBMARINE CANYONS Towards Deep-Sea Conservation in Lebanon Project
    DEEP SEA LEBANON RESULTS OF THE 2016 EXPEDITION EXPLORING SUBMARINE CANYONS Towards Deep-Sea Conservation in Lebanon Project March 2018 DEEP SEA LEBANON RESULTS OF THE 2016 EXPEDITION EXPLORING SUBMARINE CANYONS Towards Deep-Sea Conservation in Lebanon Project Citation: Aguilar, R., García, S., Perry, A.L., Alvarez, H., Blanco, J., Bitar, G. 2018. 2016 Deep-sea Lebanon Expedition: Exploring Submarine Canyons. Oceana, Madrid. 94 p. DOI: 10.31230/osf.io/34cb9 Based on an official request from Lebanon’s Ministry of Environment back in 2013, Oceana has planned and carried out an expedition to survey Lebanese deep-sea canyons and escarpments. Cover: Cerianthus membranaceus © OCEANA All photos are © OCEANA Index 06 Introduction 11 Methods 16 Results 44 Areas 12 Rov surveys 16 Habitat types 44 Tarablus/Batroun 14 Infaunal surveys 16 Coralligenous habitat 44 Jounieh 14 Oceanographic and rhodolith/maërl 45 St. George beds measurements 46 Beirut 19 Sandy bottoms 15 Data analyses 46 Sayniq 15 Collaborations 20 Sandy-muddy bottoms 20 Rocky bottoms 22 Canyon heads 22 Bathyal muds 24 Species 27 Fishes 29 Crustaceans 30 Echinoderms 31 Cnidarians 36 Sponges 38 Molluscs 40 Bryozoans 40 Brachiopods 42 Tunicates 42 Annelids 42 Foraminifera 42 Algae | Deep sea Lebanon OCEANA 47 Human 50 Discussion and 68 Annex 1 85 Annex 2 impacts conclusions 68 Table A1. List of 85 Methodology for 47 Marine litter 51 Main expedition species identified assesing relative 49 Fisheries findings 84 Table A2. List conservation interest of 49 Other observations 52 Key community of threatened types and their species identified survey areas ecological importanc 84 Figure A1.
    [Show full text]
  • Climate Change Report for Gulf of the Farallones and Cordell
    Chapter 6 Responses in Marine Habitats Sea Level Rise: Intertidal organisms will respond to sea level rise by shifting their distributions to keep pace with rising sea level. It has been suggested that all but the slowest growing organisms will be able to keep pace with rising sea level (Harley et al. 2006) but few studies have thoroughly examined this phenomenon. As in soft sediment systems, the ability of intertidal organisms to migrate will depend on available upland habitat. If these communities are adjacent to steep coastal bluffs it is unclear if they will be able to colonize this habitat. Further, increased erosion and sedimentation may impede their ability to move. Waves: Greater wave activity (see 3.3.2 Waves) suggests that intertidal and subtidal organisms may experience greater physical forces. A number of studies indicate that the strength of organisms does not always scale with their size (Denny et al. 1985; Carrington 1990; Gaylord et al. 1994; Denny and Kitzes 2005; Gaylord et al. 2008), which can lead to selective removal of larger organisms, influencing size structure and species interactions that depend on size. However, the relationship between offshore significant wave height and hydrodynamic force is not simple. Although local wave height inside the surf zone is a good predictor of wave velocity and force (Gaylord 1999, 2000), the relationship between offshore Hs and intertidal force cannot be expressed via a simple linear relationship (Helmuth and Denny 2003). In many cases (89% of sites examined), elevated offshore wave activity increased force up to a point (Hs > 2-2.5 m), after which force did not increase with wave height.
    [Show full text]
  • Relative Temperature Scaling of Metabolic and Ingestion Rates
    Toward predicting community-level effects of climate: relative temperature scaling of metabolic and ingestion rates Iles, A. C. (2014). Toward predicting community-level effects of climate: relative temperature scaling of metabolic and ingestion rates. Ecology, 95(9), 2657–2668. doi:10.1890/13-1342.1 10.1890/13-1342.1 Ecological Society of America Version of Record http://cdss.library.oregonstate.edu/sa-termsofuse Ecology, 95(9), 2014, pp. 2657–2668 Ó 2014 by the Ecological Society of America Toward predicting community-level effects of climate: relative temperature scaling of metabolic and ingestion rates 1 ALISON C. ILES Department of Zoology, Oregon State University, Corvallis, Oregon 97331 USA Abstract. Predicting the effects of climate change on ecological communities requires an understanding of how environmental factors influence both physiological processes and species interactions. Specifically, the net impact of temperature on community structure depends on the relative response of physiological energetic costs (metabolism) and energetic gains (ingestion of resources) that mediate the flow of energy throughout a food web. However, the relative temperature scaling of metabolic and ingestion rates have rarely been measured for multiple species within an ecological assemblage and it is not known how, and to what extent, these relative scaling differences vary among species. To investigate the relative influence of these processes, I measured the temperature scaling of metabolic and ingestion rates for a suite of rocky intertidal species using a multiple regression experimental design. I compared oxygen consumption rates (as a proxy for metabolic rate) and ingestion rates by estimating the temperature scaling parameter of the universal temperature dependence (UTD) model, a theoretical model derived from first principles of biochemical kinetics and allometry.
    [Show full text]
  • Seashore Beaty Box #007) Adaptations Lesson Plan and Specimen Information
    Table of Contents (Seashore Beaty Box #007) Adaptations lesson plan and specimen information ..................................................................... 27 Welcome to the Seashore Beaty Box (007)! .................................................................................. 28 Theme ................................................................................................................................................... 28 How can I integrate the Beaty Box into my curriculum? .......................................................... 28 Curriculum Links to the Adaptations Lesson Plan ......................................................................... 29 Science Curriculum (K-9) ................................................................................................................ 29 Science Curriculum (10-12 Drafts 2017) ...................................................................................... 30 Photos: Unpacking Your Beaty Box .................................................................................................... 31 Tray 1: ..................................................................................................................................................... 31 Tray 2: .................................................................................................................................................... 31 Tray 3: ..................................................................................................................................................
    [Show full text]
  • OREGON ESTUARINE INVERTEBRATES an Illustrated Guide to the Common and Important Invertebrate Animals
    OREGON ESTUARINE INVERTEBRATES An Illustrated Guide to the Common and Important Invertebrate Animals By Paul Rudy, Jr. Lynn Hay Rudy Oregon Institute of Marine Biology University of Oregon Charleston, Oregon 97420 Contract No. 79-111 Project Officer Jay F. Watson U.S. Fish and Wildlife Service 500 N.E. Multnomah Street Portland, Oregon 97232 Performed for National Coastal Ecosystems Team Office of Biological Services Fish and Wildlife Service U.S. Department of Interior Washington, D.C. 20240 Table of Contents Introduction CNIDARIA Hydrozoa Aequorea aequorea ................................................................ 6 Obelia longissima .................................................................. 8 Polyorchis penicillatus 10 Tubularia crocea ................................................................. 12 Anthozoa Anthopleura artemisia ................................. 14 Anthopleura elegantissima .................................................. 16 Haliplanella luciae .................................................................. 18 Nematostella vectensis ......................................................... 20 Metridium senile .................................................................... 22 NEMERTEA Amphiporus imparispinosus ................................................ 24 Carinoma mutabilis ................................................................ 26 Cerebratulus californiensis .................................................. 28 Lineus ruber .........................................................................
    [Show full text]
  • The Impact of Tributyltin in the Cook Inlet Watershed Team
    Hasse et. al. The Impact of Tributyltin in the Cook Inlet Watershed Team: Mat-Tsunamis Ariel Hasse Joshua Hartman Ashton Lund Corina Monroe Peyton Murphy Mat-Su Career and Technical High School 2472 N. Seward Meridian Pkwy Wasilla, AK 99654 Primary Contact: Ariel Hasse [email protected] Coach: Timothy Lundt [email protected] Disclaimer: This paper was written as part of the Alaska Ocean Sciences Bowl high school competition. The conclusions in this report are solely those of the student authors. Hasse et. al. The Impact of Tributyltin in the Cook Inlet Watershed From the shores of England to the watersheds of Alaska, all marine environments face degradation with the exposure of tributyltin, commonly known as TBT. Since the introduction of TBT in the 1960s, boat hulls and fishing equipment have become more hydrodynamic by eliminating microbial organisms’ growth on marine equipment therefore increasing efficiency. However, in the late 1970s and 1980s, the environmental cost of such efficiencies became apparent with the loss of marine habitat. Bottom dwelling primary consumers began to develop mutations that could cause death and disease, and secondary and tertiary consumers also experienced similar health declensions due to TBT exposure. In Alaska’s Cook Inlet the effects of TBT were recorded officially in 1986 with conformational research conducted in 2006. This watershed houses a diverse ecosystem and is an important economic area for Alaska. The recorded disturbance that the toxin, TBT, causes to this critical inlet is detrimental to the habitat and organisms, as well as Alaskan residents. However, since Alaska banned TBT in 2001, little research or remediation has been conducted.
    [Show full text]
  • Defining Reference Condition (T0) for the Soft Sediment Epibenthos and Demersal-Benthopelagic Fish in the Norther and Rentel Concession Zones
    CHAPTER 4 DEFINING REFERENCE CONDITION (T0) FOR THE SOFT SEDIMENT EPIBENTHOS AND DEMERSAL-BENTHOPELAGIC FISH IN THE NORTHER AND RENTEL CONCESSION ZONES DE BACKER Annelies & HOSTENS Kris Flanders Research Institute for Agriculture, Fisheries and Food (ILVO), Aquatic Environment and Quality, Ankerstraat 1, 8400 Oostende, Belgium Corresponding author: [email protected] Abstract Norther seems justified as the extrapolation In the near future, two new offshore wind of previous monitoring results from the oth- farms (OWFs) will be constructed in Belgian er OWFs cannot be guaranteed. Monitoring waters, Norther and Rentel. In this chapter, of Rentel, on the other hand, seems redun- we explored whether the epibenthos and dant within the current WinMon monitoring demersal-benthopelagic fish assemblage in program, as there is a high similarity with these future OWFs differed from the (refer- the C-power epibenthos and fish assemblag- ence) assemblages that are currently moni- es. Although, integration of Norther in the tored within the WinMon program i.e., for monitoring framework is recommended, it is the OWFs C-Power and Belwind. Secondly, important to consider that natural variability within this zone is very high, especially for the T0 reference conditions for both new concession zones are described. All sam- epibenthos, which may obscure both short ples were taken in autumn 2016, as such and long-term potential effects related to the excluding both interannual variability and presence of the Norther OWF, and the fisher- seasonality. ies exclusion in this concession zone. A clear north-south gradient was ob- served within the wider OWF area for both 1.
    [Show full text]
  • Research Article Hydrodynamic Conditions Effects on Soft-Bottom Subtidal Nearshore Benthic Community Structure and Distribution
    Hindawi Journal of Marine Sciences Volume 2020, Article ID 4674580, 16 pages https://doi.org/10.1155/2020/4674580 Research Article Hydrodynamic Conditions Effects on Soft-Bottom Subtidal Nearshore Benthic Community Structure and Distribution Clémence Foulquier ,1,2 Julien Baills,1 Alison Arraud,1 Frank D’Amico,2 Hugues Blanchet,3 Didier Rihouey,1 and Noëlle Bru2 1Casagec Ingenierie, 18 rue Maryse Bastié, 64600 Anglet, France 2CNRS/UNIV Pau & Pays Adour/E2S UPPA, Laboratoire de Mathématiques et de Leurs Applications de Pau, UMR 5142 64600, Anglet, France 3Université de Bordeaux, UMR 5805 EPOC, Station Marine d’Arcachon, 2 Rue du Professeur Jolyet, 33120 Arcachon, France Correspondence should be addressed to Clémence Foulquier; [email protected] Received 22 May 2019; Revised 30 August 2019; Accepted 15 October 2019; Published 30 January 2020 Academic Editor: Garth L. Fletcher Copyright © 2020 Clémence Foulquier et al. is is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. is study assesses the impacts of wave action and freshwater outflow on so-bottom benthic macrofauna spatial distribution and temporal stability along the highly exposed French Basque coast. Sediment characteristics and macrofauna abundance have been seasonally investigated during two years for nine stations located at the same (6 m) depth and spread over three subtidal sites showing distinct exposure levels. Wave climate has been determined through an operational numerical model. A total of 121 taxa were recorded, gathered in three main faunal assemblages, as revealed by classification and ordination methods.
    [Show full text]
  • Nucella Lapillus Class: Gastropoda Order: Neogastropoda Family
    These are easily seen on the nearby Nucella lapillus shoreline. Class: Gastropoda Order: Neogastropoda Family: Muricidae Genus: Nucella Distribution They are common on the On the west side of the Atlantic they extend from Long Island rocky coasts of the North in the USA, north along the (eastern) Canadian coastline to Atlantic. They occur on Greenland. On the eastern (European) side they occur from coastlines of both the southern Portugal north through Scandinavia into the Siberian western and eastern side of arctic. They also occupy the coastline of Iceland. this ocean. They are commonly found around the coastline of Nova Scotia. Habitat In coastal environments the littoral zone extends from the high They occupy the littoral water mark, which is rarely inundated, to shoreline areas that are zone of the North Atlantic, permanently submerged. It always includes the intertidal zone. this being the part of a sea, They occur on both exposed shores and sheltered shores, lake or river that is close to ranging between the 19 °C summer isotherm in the south and the shore. the -1 °C winter isotherm in the north. Food Nucella possess a radula which is a toothed appendage for Dog whelks are predatory removing flesh, and a mouth on an extensible proboscis. It feeds snails. They feed mostly on either by inserting the proboscis between the shells of bivalves barnacles and mussels. or plates of barnacles and using the radula to rasp flesh, or by Periwinkles, other drilling a small hole in the shell of its prey through which it gastropods and bivalves are inserts its proboscis.
    [Show full text]