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TABLE 1. Regression equations relating shell size (mm) to biovolume.

 

Species

Size (mm) vs. biovolume (ml)

r

Tawera gayi

Ln Y = 3,21 Ln X - 9,24; X= shell length

0.91

Trophon geversianus

Ln Y= 2,29 Ln X – 5,41; X = shell width

0.97

 

TABLE 2. Relative abundance of predators and their potential prey in different sites located on the Beagle Channel. Trophon geversianus specimens with drillholes were only found in site 1. In the other sites specimens with drillholes were always bivalves.

 

Sites

This study

(site 1)

R.Ovando

(site 2)

Gable

(70 km east)

Ensenada

(5 km east)

Age

ca. 4000 yr

(Not dated)

4425+/-55

4790+/-100

Modern

Prey

35% Trophon

94% Tawera

96,38% Tawera, Mytilus

97,8% Mytilus

Predator

65% Trophon

6% Trophon

3,6% Trophon,

Xymenopsis

2,2% Trophon

N

20

180

138

141

Trophon

Predation

Intraguild

Interguild

Interguild

Interguild

Competition

Regime

High

Low

Low

Low

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