Dendrodoa

A Vulnerable genera from the “Other: Chordata” group, mostly found in Cobbles

Cobbles

Vulnerable

Other: Chordata

Genera Characteristics Recorded Traits Possible Values
Size in cm
  • 1-10 cm
  • <1 cm
  • 1-10 cm
  • 11-20 cm
  • >20 cm
Genera Characteristics Recorded Traits Possible Values
Motility (Adult)
  • Sedentary
  • Adult
  • Short Range Mobility
  • Sedentary

“Sedentary”

Motility (Larval)
  • Short Term Planktonic
  • Long Term Planktonic
  • Short Term Planktonic
  • Brooded or Laid Eggs

“Short Term Planktonic”

Lifespan
  • 1-2 years
  • >10 years
  • 3-10 years
  • 1-2 years
  • <1 year
Maturity
  • 1-2 years
  • >4 years
  • 3-4 years
  • 1-2 years
  • <1 year
Fecundity
  • 100 - 1000
  • 1 - 10
  • 10 - 100
  • 100 - 1000
  • 1000 - 10000
  • 10000 - 1 million
  • > 1 million

Image: Dendrodoa © John Ryland

Vulnerability

Dendrodoa is a solitary sea squirt that sometimes forms dense aggregations attached to stones, shells or other hard surfaces. It is sessile & feeds by filtering particulate matter from the water column through a complex branchial basket. It is likely to be vulnerable to dredging & to deposition of material mobilised by the dredging process. This can smother the animals or clog the branchial filtration system. The sea squirt requires solid substrata for attachment & is vulnerable to deposition of sand over surfaces that might otherwise be available for colonisation.
 

Recoverability

Dendrodoa is a relatively short-lived animal, living for only 1-2yrs, & reaching sexual maturity after a year. It produces a moderate number of offspring ca.250 which remain in the water column as tadpole larvae for <1 day. The dispersal potential is therefore not expected to be great. Recoverability of this genus is assessed as low in the absence of adult populations in the immediate vicinity.

 

References

  • Biology

    • Fish & Fish, 1996
    • Gibson et al., 2001
    • Hayward & Ryland, 1990
    • Hayward & Ryland, 1995b
    • Hayward et al., 1996
    • Millar, 1970
  • Taxonomy

    • Fish & Fish, 1996
    • Gibson et al., 2001
    • Hayward & Ryland, 1995b
    • Hayward et al., 1996
    • Howson & Picton, 1997
    • Millar, 1970
  • Distribution

    • Bruce et al., 1963
    • Fish & Fish, 1996
    • Gibson et al., 2001
    • Hayward & Ryland, 1990
    • Hayward & Ryland, 1995b
    • Hayward et al., 1996
    • Millar, 1970
  • Reproduction

    • MBA, 1957
    • Millar, 1954