Description
The ecology of subtidal rhodolith beds has been investigated for the first time in New Zealand, characterising two rhodolith species, Lithothamnion crispatum and Sporolithon durum, examining the structure and physical characteristics of beds at two locations and documenting their associated biodiversity. Site and characteristics: Field work was conducted in the Bay of Islands, at Kahuwhera Bay and Te Miko Reef, in February and September 2010. The rhodolith beds were mapped using a combination of techniques and the physical characteristics of the habitats were assessed and compared with adjacent areas outside the rhodolith beds. The rhodolith beds differed significantly in terms of water motion, sediment characteristics and light levels, with Te Miko Reef having characteristics regarded as typical of rhodolith assemblages, and Kahuwhera Bay being atypical with respect to sediments and water clarity. The Te Miko Reef bed was in clear water and rhodoliths were clearly visible sitting on top of the substrate in a more or less single layer over rhodolith- and shell-derived gravel, whereas at Kahuwhera Bay there were fine sediments suspended in the water column and covering rhodoliths and associated biota, and live rhodoliths were in a more or less single layer overlaying grey to blackened rhodoliths in a darkly coloured rhodolith/sediment sublayer. The two rhodolith beds differed in current direction and strength with no clear tidal signal or direction of water motion at Kahuwhera Bay and tidally driven water movement at Te Miko Reef with a dominant northwest flow.
This Rhodolith Beds in Northern New Zealand: Characterisation of Associated Biodiversity dataset is made available under the Creative Commons Attribution 4.0 New Zealand Licence http://creativecommons.org/licenses/by/4.0/nz/. If you publish, distribute, or otherwise disseminate this work to the public without adapting it, the following attribution to MPI should be used: “Source: Ministry for Primary Industries (MPI) and licensed by MPI for re-use under the Creative Commons Attribution 3.0 New Zealand licence." If you adapt this work in any way or include it in a collection, and publish, distribute, or otherwise disseminate that adaptation or collection to the public, the following attribution to MPI should be used: "This work is based on/includes MPI’s data which are licensed by the Ministry for Primary Industries (MPI) for re-use under the Creative Commons Attribution 4.0 New Zealand licence."
Enregistrements de données
Les données de cette ressource données d'échantillonnage ont été publiées sous forme d'une Archive Darwin Core (Darwin Core Archive ou DwC-A), le format standard pour partager des données de biodiversité en tant qu'ensemble d'un ou plusieurs tableurs de données. Le tableur de données du cœur de standard (core) contient 30 enregistrements.
2 tableurs de données d'extension existent également. Un enregistrement d'extension fournit des informations supplémentaires sur un enregistrement du cœur de standard (core). Le nombre d'enregistrements dans chaque tableur de données d'extension est illustré ci-dessous.
Cet IPT archive les données et sert donc de dépôt de données. Les données et métadonnées de la ressource sont disponibles pour téléchargement dans la section téléchargements. Le tableau des versions liste les autres versions de chaque ressource rendues disponibles de façon publique et permet de tracer les modifications apportées à la ressource au fil du temps.
Versions
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Comment citer
Les chercheurs doivent citer cette ressource comme suit:
Nelson, W.A.; Neill, K.; Barr, N.; D'Archino, R.; Miller, S.; Stewart, R. (2012). Data from: Rhodolith Beds in Northern New Zealand: Characterisation of Associated Biodiversity. Southwestern Pacific OBIS, National Institute of Water and Atmospheric Research (NIWA), Wellington, New Zealand, 684 records, Online http://nzobisipt.niwa.co.nz/resource.do?r=rhodolithhabitats released on June 20, 2015.
Droits
Les chercheurs doivent respecter la déclaration de droits suivante:
L’éditeur et détenteur des droits de cette ressource est The National Institute of Water and Atmospheric Research (NIWA). Ce travail est sous licence Creative Commons Attribution (CC-BY) 4.0.
Enregistrement GBIF
Cette ressource a été enregistrée sur le portail GBIF, et possède l'UUID GBIF suivante : 36ae4600-17b1-437c-bdc5-7a3c98b1bff4. The National Institute of Water and Atmospheric Research (NIWA) publie cette ressource, et est enregistré dans le GBIF comme éditeur de données avec l'approbation du GBIF New Zealand.
Mots-clé
Occurrence; Observation
Contacts
- Fournisseur Des Métadonnées
- Personne De Contact
Couverture géographique
Bay of Islands, at Kahuwhera Bay and Te Miko Reef
| Enveloppe géographique | Sud Ouest [-35,263, 174,179], Nord Est [-35,229, 174,185] |
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Couverture temporelle
| Date de début / Date de fin | 2010-02-01 / 2010-09-30 |
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Méthodes d'échantillonnage
At each location, sites inside and outside the rhodolith beds were assessed (two sites at each location, i.e., Kahuwhera Bay - KWB and KWB_OUT, Te Miko Reef - TMR and TMR_OUT). At Te Miko Reef an additional site containing mixed rhodolith species was also assessed (TMR_B). As the beds were more or less at single depth (approximately 8 m), it was not necessary to stratify sampling by depth.
| Etendue de l'étude | Two rhodolith beds within the Bay of Islands, northern New Zealand, were selected as the locations for the majority of the field work in this study. These beds were identified as potential study locations during earlier field work (ZBD2004-07; Bay of Islands OS20/20 project). Kahuwhera Bay, (35o 15’ 40.00” S, 174o 10’ 55.00” E) is situated on the southern side of the larger Manawaora Bay on the mainland, and Te Miko Reef (35° 13’ 43.80” S, 174° 10’ 55.00” E) lies 4 km to the north in the 0.7–1.2 km wide channel between Moturua Island and Motuarohia Island (Figure 2). Field work was carried out in February and September 2010, allowing late summer and early spring sampling of biological and physical data. |
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Description des étapes de la méthode:
- At each site two 25 m transects were laid out at right angles to the anchor line, creating a single 50 m transect. On each transect, a random point quadrat (RPQ) (after Foster et al. 2007) was used at eight points, 5 m apart, to record the biogenic substrate type (rhodoliths, algae, microalgal mat and sponge/tunicate or bare substrate) under each of 10 knots. The point quadrat was a 1 m long bar with a 120 cm long string attached like a loose string on a bow. Five knots on the string were used as points and the organisms or substrate found on each side of the bar were sampled giving 10 points per quadrat (as detailed in Foster 1975). At sites within the rhodolith beds (i.e., KWB, TMR, TMR_B) all live rhodoliths and associated biodiversity from within a 25 by 25 cm quadrat were collected into plastic bags at each of the eight random points on the transect. These quadrat samples were tipped out into large plastic containers and then thoroughly sorted. All associated epibiota were removed and preserved appropriately for each taxon group for later identification to species level where possible. The rhodoliths were identified to 12 •Rhodolith beds in northern New Zealand Ministry for Primary Industries species, assessed for vitality (proportion of dead and live rhodoliths), and measured to obtain size frequency at each site. Rhodoliths were collected from both locations and transported to Wellington for experimental work on vulnerability to stressors (Objective 2). Infauna were assessed using a cylindrical 10 cm diameter by 10 cm depth core to remove substrate under each quadrat. A sample of sediment was kept from each core for subsequent grain size analysis (i.e., one sediment sample per quadrat). Core samples were sieved through a 5 mm mesh. All macrofauna (approximately 5 mm and above) were sorted to phylum and preserved appropriately for later identification to species level where possible.
Citations bibliographiques
- Nelson, W.A.; Neill, K.; Barr, N.; D'Archino, R.; Miller, S.; Stewart, R. (2012) .Rhodolith Beds in Northern New Zealand: Characterisation of Associated Biodiversity and Vulnerability to Environmental Stressors New Zealand Aquatic Environment and Biodiversity Report No. 99. ISSN 1179-6480 (online). ISBN 978-0-478-40077-9 (online)
Métadonnées additionnelles
marine, harvested by iOBIS
| Identifiants alternatifs | 36ae4600-17b1-437c-bdc5-7a3c98b1bff4 |
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| https://nzobisipt.niwa.co.nz/resource?r=rhodolithhabitats |