transplanting Acropora cytherea to MHI (fwd)
Ed Parnell
parnell at soest.hawaii.edu
Wed Feb 21 02:23:02 UTC 1996
---------- Forwarded message ----------
Date: Tue, 20 Feb 1996 16:17:37 -1000 (HST)
From: Ed Parnell <parnell at soest.hawaii.edu>
To: Bruce Carlson <carlson at soest.hawaii.edu>
Subject: transplanting Acropora cytherea to MHI
Hello,
I saw your reply on the coral server list regarding the transplantation
of corals for reef rehab. In it you inferred that the ends probably
wouldn't justify the means (i.e., too much effort). However, I still
wonder how Acropora cytherea would do in the Main Hawaiian Islands if
transplanted from the North West Hawaiian Islands. As you know, Acropora
is a hardy, fecund, fragmenting, and most important of all, a fast
growing species. The lack of Holocene reef accretion in Hawaii could be
due to the
lack of just such a species. Given the high energy, high disturbance
regime of Hawaii, pioneering and fast growth seem to be required for
resilience in the face of frequent disturbance. Acropora fits this bill
in addition to being resistant to wave energy such as seen in the NWHI
where it is naturally common. It just hasn't made its way to the MHI.
The recent work of Clark and Edwards (1995; Coral Reefs, 14:201-213)
demonstrate that mortality rates of transplanted acroporids was about
50% after 28 months. Given the fast growth and 50% return rates of Acropora
they measured, doesn't it seem worthwhile to try it in the MHI. The
possible benefits over the next fifty years include:
1)Production of reef that serves to:
a)enlarge coral habitat space for coral reef species
b)for fish this could mean higher biomass and therefore larger
and safer fishing stocks
c)higher fish biomass could lead to increased herbivory rates on
coral competing algae thereby leading to a an established healthy
positive feedback coral community; N.B. the production of reef by
Acropora could also enhance the biomass of other corals so the MHI reefs
would not be monospecific. Reef buildup provides vertical relief so
recruiting larvae aren't quickly abraded by sand and debris as they are now
d)protect shorelines that may be eroded in the near future by
storm waves in an ocean that's rising
2)Enhance an important natural resource of this state that attracts
tourist dollars.
As you mentioned in your reply, the inertia to establish corals to
rehabilitate/enhance reefs, if not regions, is immense. But, it may be that
once
Acropora got started in the MHI it would do quite well on its own seeding
the region from a few strategically placed reefs.
One could bring down parts of many colonies and transplant them to a
protected area such as Kaneohe Bay. After they are established and begin
to reproduce locally, they become a local source of larvae for seeding
larger and larger areas of K Bay. The planulae could be collected over
these reefs and in K Bay itself (since flushing rates are low). These
larvae could then be artificially recruited in culture and grown for a
year (to miss hi juv. mort. rates) then transplanted to other areas of
Oahu. Fragments of the K Bay colonies could also be transplanted to
other areas of Oahu.
These may be grandiose ideas but I think some discussion is warranted and at
least a transplanting pilot study should be done with A. cytherea here in
Hawaii. What do you think? Would there be resistance to this idea by
the public or reef scientists? Have you already had this idea?
Ed Parnell
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