Nearshore Dispersal and Reproductive Viability of Intertidal Fucoid Algae : how effective is drift in local to regional dispersal?
The ecological importance of drifting will depend on the abundance of drifting algae and whether it is reproductively viable. However, the ability of adult plants to successfully disperse long-distances by drifting is largely unknown, particularly for fucoids. The abundance, species composition, and...
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ftdatacite:10.26021/8260 2023-05-15T13:35:41+02:00 Nearshore Dispersal and Reproductive Viability of Intertidal Fucoid Algae : how effective is drift in local to regional dispersal? Hawes, Nicola Ann 2008 https://dx.doi.org/10.26021/8260 https://ir.canterbury.ac.nz/handle/10092/2103 unknown University of Canterbury. School of Biological Sciences Copyright Nicola Ann Hawes https://canterbury.libguides.com/rights/theses Nearshore dispersal Fucoid algae Intertidal Drift Reproductive viability Durvillaea Hormosira Cystophora CreativeWork article 2008 ftdatacite https://doi.org/10.26021/8260 2021-11-05T12:55:41Z The ecological importance of drifting will depend on the abundance of drifting algae and whether it is reproductively viable. However, the ability of adult plants to successfully disperse long-distances by drifting is largely unknown, particularly for fucoids. The abundance, species composition, and reproductive status of drifting algae was examined by transect surveys around Kaikoura and Banks Peninsula. Abundance and species composition varied between sites, but all drifting algae that were in reproductive season, and had reproductive structures intact, were reproductively active. The reproductive longevity and viability of drifting and beach-cast Hormosira banksii, Durvillaea antarctica and Cytophora torulosa was compared with attached populations. Drifting algae remained reproductively viable, and fecundity did not differ from that of attached algae. Viable propagules were released from drifting algae for the duration of the experiments (H. banksii 57 days, D. antarctica 62 days, and C. torulosa 43 days). In contrast, beach-cast algae ceased to release propagules after 14 days. Dispersal by drifting relies on offshore transport after detachment. To determine the influence of wind and tidal currents on the nearshore transport of drifting algae, tagged H. banksii, D. antarctica, C. torulosa and GPS-tracked drifters were released from shore. Drifters generally moved in the direction of the prevailing wind, but some influence of tidal direction and bathymetry was detected. Offshore winds and outgoing tides were favourable for the offshore transport of surface drifting algae. Following dispersal and arrival at new locations, the distance between gametes may be important in determining the fertilisation success of dioecious species. Experiments testing the fertilisation success of H. banksii and D. antarctica, over increasing distances, showed that fertilisation success decreased with increasing distance between male and female gametes. Despite this, eggs were fertilised when male and female gametes were up to 2m apart, and sperm remained viable for 2 hours. Article in Journal/Newspaper Antarc* Antarctica DataCite Metadata Store (German National Library of Science and Technology) Banks Peninsula ENVELOPE(-108.286,-108.286,67.318,67.318) |
institution |
Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
unknown |
topic |
Nearshore dispersal Fucoid algae Intertidal Drift Reproductive viability Durvillaea Hormosira Cystophora |
spellingShingle |
Nearshore dispersal Fucoid algae Intertidal Drift Reproductive viability Durvillaea Hormosira Cystophora Hawes, Nicola Ann Nearshore Dispersal and Reproductive Viability of Intertidal Fucoid Algae : how effective is drift in local to regional dispersal? |
topic_facet |
Nearshore dispersal Fucoid algae Intertidal Drift Reproductive viability Durvillaea Hormosira Cystophora |
description |
The ecological importance of drifting will depend on the abundance of drifting algae and whether it is reproductively viable. However, the ability of adult plants to successfully disperse long-distances by drifting is largely unknown, particularly for fucoids. The abundance, species composition, and reproductive status of drifting algae was examined by transect surveys around Kaikoura and Banks Peninsula. Abundance and species composition varied between sites, but all drifting algae that were in reproductive season, and had reproductive structures intact, were reproductively active. The reproductive longevity and viability of drifting and beach-cast Hormosira banksii, Durvillaea antarctica and Cytophora torulosa was compared with attached populations. Drifting algae remained reproductively viable, and fecundity did not differ from that of attached algae. Viable propagules were released from drifting algae for the duration of the experiments (H. banksii 57 days, D. antarctica 62 days, and C. torulosa 43 days). In contrast, beach-cast algae ceased to release propagules after 14 days. Dispersal by drifting relies on offshore transport after detachment. To determine the influence of wind and tidal currents on the nearshore transport of drifting algae, tagged H. banksii, D. antarctica, C. torulosa and GPS-tracked drifters were released from shore. Drifters generally moved in the direction of the prevailing wind, but some influence of tidal direction and bathymetry was detected. Offshore winds and outgoing tides were favourable for the offshore transport of surface drifting algae. Following dispersal and arrival at new locations, the distance between gametes may be important in determining the fertilisation success of dioecious species. Experiments testing the fertilisation success of H. banksii and D. antarctica, over increasing distances, showed that fertilisation success decreased with increasing distance between male and female gametes. Despite this, eggs were fertilised when male and female gametes were up to 2m apart, and sperm remained viable for 2 hours. |
format |
Article in Journal/Newspaper |
author |
Hawes, Nicola Ann |
author_facet |
Hawes, Nicola Ann |
author_sort |
Hawes, Nicola Ann |
title |
Nearshore Dispersal and Reproductive Viability of Intertidal Fucoid Algae : how effective is drift in local to regional dispersal? |
title_short |
Nearshore Dispersal and Reproductive Viability of Intertidal Fucoid Algae : how effective is drift in local to regional dispersal? |
title_full |
Nearshore Dispersal and Reproductive Viability of Intertidal Fucoid Algae : how effective is drift in local to regional dispersal? |
title_fullStr |
Nearshore Dispersal and Reproductive Viability of Intertidal Fucoid Algae : how effective is drift in local to regional dispersal? |
title_full_unstemmed |
Nearshore Dispersal and Reproductive Viability of Intertidal Fucoid Algae : how effective is drift in local to regional dispersal? |
title_sort |
nearshore dispersal and reproductive viability of intertidal fucoid algae : how effective is drift in local to regional dispersal? |
publisher |
University of Canterbury. School of Biological Sciences |
publishDate |
2008 |
url |
https://dx.doi.org/10.26021/8260 https://ir.canterbury.ac.nz/handle/10092/2103 |
long_lat |
ENVELOPE(-108.286,-108.286,67.318,67.318) |
geographic |
Banks Peninsula |
geographic_facet |
Banks Peninsula |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_rights |
Copyright Nicola Ann Hawes https://canterbury.libguides.com/rights/theses |
op_doi |
https://doi.org/10.26021/8260 |
_version_ |
1766068944674750464 |