Notes on the marine algal ecology of some exposed rocky shores of Northland, New Zealand

Bergquist, P. L.

doi:10.1515/botm.1960.1.3-4.86

Cited by 9 publications

(8 citation statements)

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“…The earliest descriptions of subtidal macroalgal zonation at Goat Island (Bergquist 1960) indicated different macroalgal assemblages, including the presence of C. flexuosum, from those later quantified by Choat & Schiel (1982). Decadal scale changes in macroalgal assemblages are clearly occurring in north-eastern New Zealand.…”

Section: Long-term Changementioning

confidence: 97%

Distributional expansion ofCarpophyllum flexuosumonto wave‐exposed reefs in north‐eastern New Zealand

Cole

Babcock

Travers

et al. 2001

New Zealand Journal of Marine and Freshwater Research

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The native fucalean macroalga Carpophyllum flexuosum (Esper) Grev. has recently occupied many reefs on wave-exposed coasts in north-eastern New Zealand. At recently colonised sites, C. flexuosum occurs mainly on coralline-dominated areas with moderate densities of sea urchins (Evechinus chloroticus). At these sites, stipes of C. flexuosum are shorter, with more branching, reduced laminae, and increased stipe weights compared to those at sheltered sites. Survivorship of tagged individuals was less on wave-exposed than on sheltered reefs. On sheltered shores, small C. flexuosum suffered moderate mortality, but large individuals suffered little mortality from any source. All individuals transplanted from sheltered to wave-exposed shores died or became moribund as stipes, whereas those which survived transplanting from wave-exposed to sheltered shores assumed a morphology more characteristic of sheltered sites. Population modelling suggested that the existence of stands of C. flexuosum on wave-exposed shores is dependent on regular recruitment, though it is not clear whether populations are maintained by recruitment from within or without. The establishment of C. flexuosum on wave-exposed shores is correlated with decadal scale decreases in wave energy. We predict that the patchiness of recruitment of C. flexuosum in space and time (and the ubiquity and reproductive characteristics of the dominant laminarian Ecklonia radiata) and its susceptibility to wave action will prevent the fucalean from inducing long-term changes of assemblage organisation.

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Section: Long-term Changementioning

confidence: 97%

Distributional expansion ofCarpophyllum flexuosumonto wave‐exposed reefs in north‐eastern New Zealand

Cole

Babcock

Travers

et al. 2001

New Zealand Journal of Marine and Freshwater Research

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“…The Caulerpa mats and red foliose algae habitats are previously undescribed in north-eastern New Zealand although Bergquist (1960) reported a zone of red foliose algae in the upper subtidal on exposed reefs at Spirits Bay. These habitat types generally did not form distinct zones and were more likely to be found in patches ranging in size from 2 to 20 m 2 , particularly at offshore islands and northern localities such as Cape Karikari.…”

Section: Discussionmentioning

confidence: 99%

Validation of qualitative habitat descriptors commonly used to classify subtidal reef assemblages in north‐eastern New Zealand

Shears¹,

Babcock

Duffy³

et al. 2004

New Zealand Journal of Marine and Freshwater Research

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On shallow temperate subtidal reefs, habitat types are usually defined subjectively by the dominance or presence of major macroalgal species. Many of these habitat types (e.g., urchin barrens, kelp forest) are frequently used in the literature but little attempt has been made to quantitatively define these habitats. A survey of shallow subtidal reefs in north-eastern New Zealand identified a number of commonly occurring "habitat types". In this paper the abundances of habitat-forming species within each of these habitats are quantified and the validity of the subjective classification system is tested. In addition to previously-described reef habitats from north-eastern New Zealand a number of other habitat types were encountered and described in this study (e.g., "mixed algae", "red foliose algae", and "Caulerpa mats"). The algal communities within M03077; Online publication date 5 August 2004 Received 12 November 2003; accepted 17 May 2004each habitat were biologically distinct and there was strong concordance between the grouping of samples from cluster analysis and the subjective habitat type assigned to each. The habitat classification system was reliable and canonical analysis of principal coordinates revealed an overall classification success of 81%. This provides strong evidence that the habitat classifications used in this study are biologically meaningful based on the abundances of habitatforming algal groups. Furthermore, this demonstrates that these habitat types can be reliably categorised visually, which has important applications in classification and mapping of the marine environment.

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“…This was followed by a more detailed study of the intertidal communities of the Poor Knights Islands by Cranwell & Moore (1938). When V. J. Chapman established the school of phycology at Auckland in 1946, there was an upsurge of interest in marine algal ecology and many ecological and physiological experiments on the factors influencing intertidal zonation were carried out (Trevarthen 1954, Bergquist 1957, Chapman .19?6,. Clark.…”

Section: Ecologymentioning

confidence: 99%

Biosystematics of the cryptogamic flora of New Zealand: Algae

Parsons¹

1985

New Zealand Journal of Botany

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The groups of organisms included in the algae and their extensive diversity are discussed. The algae of New Zealand can be divided into three main ecological-morphological groups: the freshwater algae of which we have about 2080 species, the marine micro-algae with approximately 700 species and the marine macro-algae, the best known group, with about 900 species.The present knowledge of the marine macro-algae is reviewed. The current marine algal Floras are not complete and are inadequate for positive identification of many species. Much taxonomy remains to be done. Few studies on the biogeography, life history, cytology, ultrastructure. and ecology of marine algae have been completed.Marine micro-algae and freshwater algae are similarly not well documented. Although checklists exist for some of these algal groups, critical taxonomy and Rora writing is still required to assist with identifications.Recent studies on the chemical analysis of algae for agars and carrageenans, the testing of compounds that have anti-bacterial and antiviral activity, and the toxins of poisonous algae are summarised. The necessity to study taxonomically both marine and freshwater microalgae and to monitor the conditions of growth, particularly of toxic algal blooms which inevitably have economic importance, is emphasised.

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Notes on the marine algal ecology of some exposed rocky shores of Northland, New Zealand

Cited by 9 publications

References 0 publications

Distributional expansion ofCarpophyllum flexuosumonto wave‐exposed reefs in north‐eastern New Zealand

Distributional expansion ofCarpophyllum flexuosumonto wave‐exposed reefs in north‐eastern New Zealand

Validation of qualitative habitat descriptors commonly used to classify subtidal reef assemblages in north‐eastern New Zealand

Biosystematics of the cryptogamic flora of New Zealand: Algae

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