gastropod mollusks of vancouver island, canadametchosinbiodiversity.com/documents/gastrod mollusks...
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DISTRIBUTION OF GASTROPOD DISTRIBUTION OF GASTROPOD
MOLLUSKS ON THE INTERTIDAL MOLLUSKS ON THE INTERTIDAL
ZONE OF VANCOUVER ISLAND, ZONE OF VANCOUVER ISLAND,
CANADACANADA
Travis Travis MacKenzieMacKenzie
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Summer 2005Summer 2005
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Over 800 specimens of Over 800 specimens of
Gastropod Mollusks Gastropod Mollusks
representing 20 species from representing 20 species from
8 orders 8 orders
13 families13 families
from 8 localitiesfrom 8 localities
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Miracle BeachMiracle Beach�� Habitat Habitat –– sandy with rocky areassandy with rocky areas
�� Eastern Mid IslandEastern Mid Island
�� Number of species Number of species -- 55
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Bates BeachBates Beach
�� Habitat Habitat –– Rocky Rocky
�� Eastern Mid IslandEastern Mid Island
�� Number of species Number of species -- 44
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ComoxComox HarborHarbor
�� Habitat Habitat –– Intertidal Mud FlatsIntertidal Mud Flats
�� Eastern Mid IslandEastern Mid Island
�� Number of species Number of species -- 33
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Royston BeachRoyston Beach
�� HabitatHabitat-- Rocky intertidal Mud FlatsRocky intertidal Mud Flats
�� Eastern Mid IslandEastern Mid Island
�� Number of species Number of species –– 44
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TofinoTofino HarborHarbor
�� Habitat Habitat –– Rocky Rocky
�� Western Mid IslandWestern Mid Island
�� Number of species Number of species -- 44
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TonquinTonquin ParkPark
�� Habitat Habitat –– Sandy with rocky perimeterSandy with rocky perimeter
�� Western Mid IslandWestern Mid Island
�� Number of species Number of species -- 33
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ChestermanChesterman BeachBeach
�� Habitat Habitat –– Sandy with rocky areasSandy with rocky areas
�� Western Mid IslandWestern Mid Island
�� Number of species Number of species -- 1717
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WittmanWittman BeachBeach
�� Habitat Habitat –– Rocky with some sandy areasRocky with some sandy areas
�� Southern part of the IslandSouthern part of the Island
�� Number of species Number of species -- 55
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Gastropod mollusks of VancouverGastropod mollusks of Vancouver IslandIsland�� Rough keyhole limpet Rough keyhole limpet ((DiodoraDiodora aperaapera))
�� File limpet (File limpet (AcmaeaAcmaea limatulalimatula))
�� WhiteWhite--cap limpet (cap limpet (AcmaeaAcmaea mitramitra))
�� Mask limpet (Mask limpet (NotoacmaeaNotoacmaea personapersona ))
�� SheildSheild limpet (limpet (CollisellaCollisella peltapelta ))
�� Channeled top shell (Channeled top shell (CalliostomaCalliostoma canaliculatumcanaliculatum))
�� Black Black tegulategula ((TegulaTegula funebralisfunebralis ))
�� Slender Slender bittiumbittium ((BittiumBittium attenuatumattenuatum ))
�� Japanese false Japanese false cerithcerith ((BatillaraBatillara attramentariaattramentaria ))
�� Checkered periwinkle (Checkered periwinkle (LittorinaLittorina scutulatascutulata ))
�� Sitka periwinkle (Sitka periwinkle (LittorinaLittorina sitkanasitkana ))
�� EmarginateEmarginate dogwinkledogwinkle ((NucellaNucella emarginataemarginata ))
�� Channeled Channeled dogwinkledogwinkle ((NucellaNucella canaliculatacanaliculata ))
�� Frilled Frilled dogwinkledogwinkle ((NucellaNucella lamellosalamellosa ))
�� Channeled Channeled nassanassa ((NassariusNassarius fossatusfossatus ))
�� San Pedro dwarf olive (San Pedro dwarf olive (OlivellaOlivella pedroanapedroana ))
�� Purple dwarf olive (Purple dwarf olive (OlivellaOlivella biplicatabiplicata ))
�� GouldsGoulds dove shell (dove shell (Alia Alia gausapatagausapata ))
�� Lewis’ Lewis’ moonshellmoonshell ((PolinicesPolinices lewisiilewisii ))
�� Boreal Boreal wentletrapwentletrap ((OpaliaOpalia borealisborealis ))
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IntraspecificIntraspecific variation variation
�� Three speciesThree species
�� LittorinaLittorina scutulatascutulata
�� LittorinaLittorina sitkanasitkana
�� NucellaNucella emarginataemarginata
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Gastropod shell morphologyGastropod shell morphology
�� SpireSpire
�� Body Whorl Body Whorl outer lipouter lip
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LittorinaLittorina scutulatascutulata
��Most abundant in all localitiesMost abundant in all localities
��Varied in color and sculpture Varied in color and sculpture
of shellof shell
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L. L. scutulatascutulata color color
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L. L. scutulatascutulata sculpturesculpture
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LittorinaLittorina sitkanasitkana
��Second most abundantSecond most abundant
��Varied in color and sculpture Varied in color and sculpture
of shellof shell
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L. L. sitkanasitkana colorcolor
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L. L. sitkanasitkana sculpturesculpture
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L. L. sitkanasitkana shell shapeshell shape
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NucellaNucella emarginataemarginata
�� ColorColor
�� Lack of bandingLack of banding
�� Reduction of spiral ribsReduction of spiral ribs
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N. N. emarginataemarginata colorcolor
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N. N. emarginataemarginata bandingbanding
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N. N. emarginataemarginata spiral ribsspiral ribs
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Invasive SpeciesInvasive Species
�� BatillariaBatillaria attramentariaattramentaria (Japanese false (Japanese false
cerithcerith))
�� Brought to North America in early 20Brought to North America in early 20thth
century with pacific oyster import.century with pacific oyster import.
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BatillaraBatillara attramentariaattramentaria
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Distribution of B. Distribution of B. attramentariaattramentaria on on
the west coast of North Americathe west coast of North America
�� ComoxComox harbor is harbor is
approx 100 miles approx 100 miles
north west of north west of
Boundary bay.Boundary bay.
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ConclusionConclusion
�� The native gastropod mollusk fauna of The native gastropod mollusk fauna of
Vancouver Island, Canada, is very diverse Vancouver Island, Canada, is very diverse
and abundant, but an introduction of a and abundant, but an introduction of a
nonnon--native species could jeopardize the native species could jeopardize the
stability of native mollusk populations.stability of native mollusk populations.