Pub Date : 2022-06-16DOI: 10.1080/00288330.2022.2086587
V. Rullens, Stephanie Mangan, F. Stephenson, D. Clark, R. Bulmer, Anna Berthelsen, J. Crawshaw, Rebecca V. Gladstone‐Gallagher, S. Thomas, J. Ellis, C. Pilditch
ABSTRACT Sea level rise (SLR) has been described as one of the greatest potential causes of ecosystem disruption, putting many coastal areas at risk of irreversible changes. However, the loss of intertidal areas from SLR and the associated ecological and social repercussions receive little attention. Within estuaries, extensive intertidal areas harbour a variety of habitats and communities and represent hotspots of ecosystem functions. Any changes to their distribution or extent are likely to have far reaching implications. Here we summarise the ecological consequences of a reduction in intertidal area from increasing SLR, and the implications for people, management and planning. To facilitate this discussion, changes in the occurrence and abundance of two ecologically and culturally important intertidal shellfish species (Austrovenus stutchburyi and Macomona liliana) were modelled under different SLR scenarios for Tauranga Harbour, Aotearoa New Zealand. We highlight how the squeezing of intertidal areas will likely alter the distribution and extent of key habitats and communities, and discuss the implications for coastal food webs, ecosystem functioning and service provision. Pre-emptive planning and adaptive management are needed that incorporate ecological losses in risk assessments and focuses on pro-active solutions to increase resilience to the effects of SLR.
{"title":"Understanding the consequences of sea level rise: the ecological implications of losing intertidal habitat","authors":"V. Rullens, Stephanie Mangan, F. Stephenson, D. Clark, R. Bulmer, Anna Berthelsen, J. Crawshaw, Rebecca V. Gladstone‐Gallagher, S. Thomas, J. Ellis, C. Pilditch","doi":"10.1080/00288330.2022.2086587","DOIUrl":"https://doi.org/10.1080/00288330.2022.2086587","url":null,"abstract":"ABSTRACT Sea level rise (SLR) has been described as one of the greatest potential causes of ecosystem disruption, putting many coastal areas at risk of irreversible changes. However, the loss of intertidal areas from SLR and the associated ecological and social repercussions receive little attention. Within estuaries, extensive intertidal areas harbour a variety of habitats and communities and represent hotspots of ecosystem functions. Any changes to their distribution or extent are likely to have far reaching implications. Here we summarise the ecological consequences of a reduction in intertidal area from increasing SLR, and the implications for people, management and planning. To facilitate this discussion, changes in the occurrence and abundance of two ecologically and culturally important intertidal shellfish species (Austrovenus stutchburyi and Macomona liliana) were modelled under different SLR scenarios for Tauranga Harbour, Aotearoa New Zealand. We highlight how the squeezing of intertidal areas will likely alter the distribution and extent of key habitats and communities, and discuss the implications for coastal food webs, ecosystem functioning and service provision. Pre-emptive planning and adaptive management are needed that incorporate ecological losses in risk assessments and focuses on pro-active solutions to increase resilience to the effects of SLR.","PeriodicalId":54720,"journal":{"name":"New Zealand Journal of Marine and Freshwater Research","volume":"56 1","pages":"353 - 370"},"PeriodicalIF":1.6,"publicationDate":"2022-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42369180","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-06-16DOI: 10.1080/00288330.2022.2086586
Pat Barrett, Priya Kurian, Raven Cretney, P. Blackett, Erena Le Heron, Richard Le Heron
ABSTRACT The article analyses participatory processes in estuary restoration in Maketū on the East Coast of the North Island to examine how evolving relational dynamics amongst key stakeholders and Māori led to the achievement of a collective environmental imaginary. The case, marked by a history of conflict over the diversion of the Kaituna River and resulting estuary degradation, led to a focussed period of community engagement between 2006 and 2009 which established a collective intention to restore the ecological health of the estuary. Ongoing community engagement has been a feature of restoration project design and implementation. In examining this case, we draw on the concept of imaginaries, referring to shared visions of desirable futures, to explore how ‘imaginaries of process’ and ‘imaginaries of outcome’ played out among a heterogeneous set of stakeholders and Indigenous actors. We undertake a discourse analysis of relevant documents and of interviews and focus groups with 25 participants to demonstrate how inclusive participatory processes were used as a technique to resolve estuary degradation, address historical grievance between Māori, the community and local authorities, and reset the governance and management relationships between these actors.
{"title":"Participatory processes and the evolution of environmental agendas in estuary restoration: the Maketū case","authors":"Pat Barrett, Priya Kurian, Raven Cretney, P. Blackett, Erena Le Heron, Richard Le Heron","doi":"10.1080/00288330.2022.2086586","DOIUrl":"https://doi.org/10.1080/00288330.2022.2086586","url":null,"abstract":"ABSTRACT The article analyses participatory processes in estuary restoration in Maketū on the East Coast of the North Island to examine how evolving relational dynamics amongst key stakeholders and Māori led to the achievement of a collective environmental imaginary. The case, marked by a history of conflict over the diversion of the Kaituna River and resulting estuary degradation, led to a focussed period of community engagement between 2006 and 2009 which established a collective intention to restore the ecological health of the estuary. Ongoing community engagement has been a feature of restoration project design and implementation. In examining this case, we draw on the concept of imaginaries, referring to shared visions of desirable futures, to explore how ‘imaginaries of process’ and ‘imaginaries of outcome’ played out among a heterogeneous set of stakeholders and Indigenous actors. We undertake a discourse analysis of relevant documents and of interviews and focus groups with 25 participants to demonstrate how inclusive participatory processes were used as a technique to resolve estuary degradation, address historical grievance between Māori, the community and local authorities, and reset the governance and management relationships between these actors.","PeriodicalId":54720,"journal":{"name":"New Zealand Journal of Marine and Freshwater Research","volume":"56 1","pages":"340 - 352"},"PeriodicalIF":1.6,"publicationDate":"2022-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43303773","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-06-13DOI: 10.1080/00288330.2022.2086589
Rose Gregersen, K. Simon
ABSTRACT Nutrients are important determinants of diatom growth in lakes, and diatoms are considered reliable indicators of changing lake nutrient concentrations and eutrophication. However, diatom ecologies are not static, nor are they linked to single environmental variables, leading to imprecise diatom nutrient inferences. Anthropogenic nutrient enrichment is the principal issue facing New Zealand’s lakes. Thus, knowledge of diatom responses to nutrients in New Zealand lakes will be important for understanding contemporary and past changes in nutrient availability. Using a nutrient amendment experiment and diatom communities from dune lakes, here we show that the response of specific diatom species is not universal among lakes and is partly determined by lake nutrient concentrations and limitation status. The response of focal diatom species to nutrient additions differed from previously reported nutrient requirements, and did not align with published, assigned trophic statuses. This study highlights that the response of diatoms to nutrient enrichment is context-dependent, and that intraspecific generalisations of diatom ecologies between geographic locations or through time should be made with caution. To apply diatoms to making nutrient inferences, more work focusing on how physiochemical and biological factors influence diatom nutrient requirements is required.
{"title":"Diatom nutrient requirements change with lake nutrient limitation and enrichment in New Zealand dune lakes","authors":"Rose Gregersen, K. Simon","doi":"10.1080/00288330.2022.2086589","DOIUrl":"https://doi.org/10.1080/00288330.2022.2086589","url":null,"abstract":"ABSTRACT Nutrients are important determinants of diatom growth in lakes, and diatoms are considered reliable indicators of changing lake nutrient concentrations and eutrophication. However, diatom ecologies are not static, nor are they linked to single environmental variables, leading to imprecise diatom nutrient inferences. Anthropogenic nutrient enrichment is the principal issue facing New Zealand’s lakes. Thus, knowledge of diatom responses to nutrients in New Zealand lakes will be important for understanding contemporary and past changes in nutrient availability. Using a nutrient amendment experiment and diatom communities from dune lakes, here we show that the response of specific diatom species is not universal among lakes and is partly determined by lake nutrient concentrations and limitation status. The response of focal diatom species to nutrient additions differed from previously reported nutrient requirements, and did not align with published, assigned trophic statuses. This study highlights that the response of diatoms to nutrient enrichment is context-dependent, and that intraspecific generalisations of diatom ecologies between geographic locations or through time should be made with caution. To apply diatoms to making nutrient inferences, more work focusing on how physiochemical and biological factors influence diatom nutrient requirements is required.","PeriodicalId":54720,"journal":{"name":"New Zealand Journal of Marine and Freshwater Research","volume":"57 1","pages":"597 - 612"},"PeriodicalIF":1.6,"publicationDate":"2022-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42778257","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-06-13DOI: 10.1080/00288330.2022.2086268
L. E. McBride, H. Braid, D. Stevens, K. Bolstad
ABSTRACT Cephalopods form important components of marine trophic systems worldwide, including those in the South Pacific. Moroteuthopsis ingens (Onychoteuthidae) is one of the most abundant deep–sea squids in the Aotearoa New Zealand region and is preyed upon by predators such as the sperm whale and orange roughy. However, despite the many publications on M. ingens’ diet, knowledge on its feeding ecology remains limited. In this study, we analysed the prey of M. ingens from the Chatham Rise (an ecologically and economically important region east of Te Waipounamu/New Zealand’s South Island) using DNA barcoding and otolith identification. Lanternfishes (Myctophidae) were the most frequently encountered prey item, but other teleost species, cephalopods and crustacean fragments were also found, indicating opportunistic and likely cannibalistic feeding behaviour. Five fish species (including a possibly undescribed species of Gymnoscopelus) and Bathyteuthis abyssicola are reported as prey items of M. ingens for the first time. Moroteuthopsis ingens appears to be a component of several dynamic food chains and likely plays an important role in the transfer of carbon throughout marine environments in the Southern Hemisphere.
{"title":"Trophic ecology of the deep-sea squid Moroteuthopsis ingens (Cephalopoda: Onychoteuthidae) from the Chatham Rise, Aotearoa New Zealand","authors":"L. E. McBride, H. Braid, D. Stevens, K. Bolstad","doi":"10.1080/00288330.2022.2086268","DOIUrl":"https://doi.org/10.1080/00288330.2022.2086268","url":null,"abstract":"ABSTRACT Cephalopods form important components of marine trophic systems worldwide, including those in the South Pacific. Moroteuthopsis ingens (Onychoteuthidae) is one of the most abundant deep–sea squids in the Aotearoa New Zealand region and is preyed upon by predators such as the sperm whale and orange roughy. However, despite the many publications on M. ingens’ diet, knowledge on its feeding ecology remains limited. In this study, we analysed the prey of M. ingens from the Chatham Rise (an ecologically and economically important region east of Te Waipounamu/New Zealand’s South Island) using DNA barcoding and otolith identification. Lanternfishes (Myctophidae) were the most frequently encountered prey item, but other teleost species, cephalopods and crustacean fragments were also found, indicating opportunistic and likely cannibalistic feeding behaviour. Five fish species (including a possibly undescribed species of Gymnoscopelus) and Bathyteuthis abyssicola are reported as prey items of M. ingens for the first time. Moroteuthopsis ingens appears to be a component of several dynamic food chains and likely plays an important role in the transfer of carbon throughout marine environments in the Southern Hemisphere.","PeriodicalId":54720,"journal":{"name":"New Zealand Journal of Marine and Freshwater Research","volume":"57 1","pages":"582 - 596"},"PeriodicalIF":1.6,"publicationDate":"2022-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49326857","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-06-08DOI: 10.1080/00288330.2022.2086588
Hannah F. E. Jones, S. Hunt, Janine Kamke, M. Townsend
ABSTRACT Estuaries are complicated systems to manage effectively, requiring the monitoring of robust environmental indicators to assess health and detect changes. Routine estuarine monitoring programmes in New Zealand have only existed for 30 years at most, but estuaries have been significantly affected by anthropogenic pressures for at least 100 years. We reconstructed long term changes in indicators of estuarine health using historical information from sediment cores and aerial photographs, and combined this information with recent monitoring data. This study is focused on four estuaries in the Waikato region of New Zealand, but the findings are likely applicable elsewhere. Sediment accumulation rates increased by orders of magnitude c. 100 years ago, but mangrove forests only started to rapidly expand c. 50 years ago, which coincided with the intensification of agriculture and urban development, and resultant declines in freshwater quality. Over the past 20 years, state of the environment monitoring shows declines in benthic health at most monitoring sites, as well as continuing sediment accumulation and mangrove expansion in some places. This adds to the weight of evidence that environmental management has not been sufficient to safeguard estuarine health and demonstrates the magnitude of change in these systems over the past 100 years.
{"title":"Historical data provides context for recent monitoring and demonstrates 100 years of declining estuarine health","authors":"Hannah F. E. Jones, S. Hunt, Janine Kamke, M. Townsend","doi":"10.1080/00288330.2022.2086588","DOIUrl":"https://doi.org/10.1080/00288330.2022.2086588","url":null,"abstract":"ABSTRACT Estuaries are complicated systems to manage effectively, requiring the monitoring of robust environmental indicators to assess health and detect changes. Routine estuarine monitoring programmes in New Zealand have only existed for 30 years at most, but estuaries have been significantly affected by anthropogenic pressures for at least 100 years. We reconstructed long term changes in indicators of estuarine health using historical information from sediment cores and aerial photographs, and combined this information with recent monitoring data. This study is focused on four estuaries in the Waikato region of New Zealand, but the findings are likely applicable elsewhere. Sediment accumulation rates increased by orders of magnitude c. 100 years ago, but mangrove forests only started to rapidly expand c. 50 years ago, which coincided with the intensification of agriculture and urban development, and resultant declines in freshwater quality. Over the past 20 years, state of the environment monitoring shows declines in benthic health at most monitoring sites, as well as continuing sediment accumulation and mangrove expansion in some places. This adds to the weight of evidence that environmental management has not been sufficient to safeguard estuarine health and demonstrates the magnitude of change in these systems over the past 100 years.","PeriodicalId":54720,"journal":{"name":"New Zealand Journal of Marine and Freshwater Research","volume":"56 1","pages":"371 - 388"},"PeriodicalIF":1.6,"publicationDate":"2022-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45726927","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-06-08DOI: 10.1080/00288330.2022.2085309
P. Gerbeaux, T. Hume
ABSTRACT There is often confusion and sometimes controversy over whether a specific habitat or ecosystem is considered a wetland. In 2021, the New Zealand High Court issued a judgement that the wetland rules in the Resource Management (National Environmental Standards for Freshwater) Regulations 2020 (NES-F) do apply to wetlands in the Coastal Marine Area (CMA), more particularly which ones apply to ‘natural wetlands’. From a scientific standpoint, the term ‘coastal wetland’ can be applied to all wetland types located in New Zealand coastal hydrosystems, including non-tidal wetlands influenced, at least in part, by coastal processes. This means coastal wetlands can be found within and outside (although adjacent to) the CMA. In order to map the boundaries of wetlands currently identified within the CMA, their seaward and landward limits can be determined as: ‘areas of marine water, the depth of which, at low tide, does not exceed six metres’, and the ‘CMA definition’, respectively.
{"title":"What constitutes a wetland in the New Zealand Coastal Marine Area? – a scientific perspective","authors":"P. Gerbeaux, T. Hume","doi":"10.1080/00288330.2022.2085309","DOIUrl":"https://doi.org/10.1080/00288330.2022.2085309","url":null,"abstract":"ABSTRACT There is often confusion and sometimes controversy over whether a specific habitat or ecosystem is considered a wetland. In 2021, the New Zealand High Court issued a judgement that the wetland rules in the Resource Management (National Environmental Standards for Freshwater) Regulations 2020 (NES-F) do apply to wetlands in the Coastal Marine Area (CMA), more particularly which ones apply to ‘natural wetlands’. From a scientific standpoint, the term ‘coastal wetland’ can be applied to all wetland types located in New Zealand coastal hydrosystems, including non-tidal wetlands influenced, at least in part, by coastal processes. This means coastal wetlands can be found within and outside (although adjacent to) the CMA. In order to map the boundaries of wetlands currently identified within the CMA, their seaward and landward limits can be determined as: ‘areas of marine water, the depth of which, at low tide, does not exceed six metres’, and the ‘CMA definition’, respectively.","PeriodicalId":54720,"journal":{"name":"New Zealand Journal of Marine and Freshwater Research","volume":"56 1","pages":"333 - 339"},"PeriodicalIF":1.6,"publicationDate":"2022-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47852068","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-05-30DOI: 10.1080/00288330.2022.2080237
Yu-zhi Song, Jing Guo, Jinqi Wang
ABSTRACT To investigate the influence of nitrogen (N) and phosphorus (P) availability on the periphytic algal biomass and assemblage composition (by pigment analysis) in the eutrophic lake, natural littoral intact sediment cores in a subtropical eutrophic lake (Lake Taihu) were collected, and subjected to three levels of water N and P loading (N-P [mg. L−1]: 1.5, 0.075; 2.5, 0.125; 3.5, 0.175) in the tanks, eighteen artificial substances (glass slides) were fixed at three water depths (1, 17, and 33 cm above the surface sediment) for development of periphytic algae in each tank, respectively. The results showed that the biomass of periphytic algae on artificial substance was significantly enhanced with increasing N and P levels in water column and water depth (p < 0.05), while sediment-associated periphytic algae did not significantly increase with increasing N and P levels in water column. The development of sediment-associated periphytic algae changed the phosphorus form, calcium-bound phosphorus and inorganic phosphorus in the sediments decreased slightly, and the total phosphorus and organic phosphorus in the sediments increased. Our results suggest that N and P availability is conducive to the development of periphytic algae in subtropical eutrophic shallow lakes in spring.
{"title":"The influences of nitrogen and phosphorus availability on periphytic algae in eutrophic experimental mesocosm","authors":"Yu-zhi Song, Jing Guo, Jinqi Wang","doi":"10.1080/00288330.2022.2080237","DOIUrl":"https://doi.org/10.1080/00288330.2022.2080237","url":null,"abstract":"ABSTRACT To investigate the influence of nitrogen (N) and phosphorus (P) availability on the periphytic algal biomass and assemblage composition (by pigment analysis) in the eutrophic lake, natural littoral intact sediment cores in a subtropical eutrophic lake (Lake Taihu) were collected, and subjected to three levels of water N and P loading (N-P [mg. L−1]: 1.5, 0.075; 2.5, 0.125; 3.5, 0.175) in the tanks, eighteen artificial substances (glass slides) were fixed at three water depths (1, 17, and 33 cm above the surface sediment) for development of periphytic algae in each tank, respectively. The results showed that the biomass of periphytic algae on artificial substance was significantly enhanced with increasing N and P levels in water column and water depth (p < 0.05), while sediment-associated periphytic algae did not significantly increase with increasing N and P levels in water column. The development of sediment-associated periphytic algae changed the phosphorus form, calcium-bound phosphorus and inorganic phosphorus in the sediments decreased slightly, and the total phosphorus and organic phosphorus in the sediments increased. Our results suggest that N and P availability is conducive to the development of periphytic algae in subtropical eutrophic shallow lakes in spring.","PeriodicalId":54720,"journal":{"name":"New Zealand Journal of Marine and Freshwater Research","volume":"57 1","pages":"568 - 581"},"PeriodicalIF":1.6,"publicationDate":"2022-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43768494","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-05-29DOI: 10.1080/00288330.2022.2076702
S. Chiswell
ABSTRACT Previous work has suggested that marine heat waves (MHW) and cool spells (MCS) in the Tasman Sea are responses to a stalling of an eastward propagating austral wavenumber-4 atmospheric pressure wave. We investigate extrema in sea surface chlorophyll (SSC), defining high- and low-chlorophyll events (HCE and LCE) analogous to MHW and MCS, but using Tasman-Sea averaged SSC anomalies. From 2002 to 2020, there were 13 HCE and 10 LCE, with no indication of changes in frequency, duration, or intensity of events. HCE tend to occur when Tasman-Sea averaged sea surface temperature is anomalously cool, and LCE tend to occur when Tasman-Sea averaged surface temperature is anomalously warm, however, there is no direct relationship between temperature and chlorophyll extrema. Canonical HCE/LCE formed from the 2002 to 2020 events suggest that HCE/LCE are also driven by the austral wavenumber-4 atmospheric wave. HCE occur during periods of low wind stress after a period of increased wind stress, whereas LCE may be a result of strong vertical mixing that mixes surface phytoplankton downwards. The implications of this work are that changes in Tasman Sea primary production in a future ocean will depend on any changes in the wavenumber-4 atmospheric wave.
{"title":"Tasman Sea high- and low- chlorophyll events, their links to marine heat waves, cool spells, and global teleconnections","authors":"S. Chiswell","doi":"10.1080/00288330.2022.2076702","DOIUrl":"https://doi.org/10.1080/00288330.2022.2076702","url":null,"abstract":"ABSTRACT Previous work has suggested that marine heat waves (MHW) and cool spells (MCS) in the Tasman Sea are responses to a stalling of an eastward propagating austral wavenumber-4 atmospheric pressure wave. We investigate extrema in sea surface chlorophyll (SSC), defining high- and low-chlorophyll events (HCE and LCE) analogous to MHW and MCS, but using Tasman-Sea averaged SSC anomalies. From 2002 to 2020, there were 13 HCE and 10 LCE, with no indication of changes in frequency, duration, or intensity of events. HCE tend to occur when Tasman-Sea averaged sea surface temperature is anomalously cool, and LCE tend to occur when Tasman-Sea averaged surface temperature is anomalously warm, however, there is no direct relationship between temperature and chlorophyll extrema. Canonical HCE/LCE formed from the 2002 to 2020 events suggest that HCE/LCE are also driven by the austral wavenumber-4 atmospheric wave. HCE occur during periods of low wind stress after a period of increased wind stress, whereas LCE may be a result of strong vertical mixing that mixes surface phytoplankton downwards. The implications of this work are that changes in Tasman Sea primary production in a future ocean will depend on any changes in the wavenumber-4 atmospheric wave.","PeriodicalId":54720,"journal":{"name":"New Zealand Journal of Marine and Freshwater Research","volume":"57 1","pages":"550 - 567"},"PeriodicalIF":1.6,"publicationDate":"2022-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48004870","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-05-19DOI: 10.1080/00288330.2022.2074059
C. Roberts, A. Stewart
ABSTRACT The eastern Australian flatback mangrove goby Mugilogobius platynotus (Günther 1861) is recorded for the first time from Aotearoa, New Zealand. Three voucher specimens (two males and one female) were collected using fish traps submerged in tidal drains of a saltmarsh wetland edged by mangroves adjacent to Ngunguru River, Northland. Key characters for identification: the colour of freshly thawed specimens, meristic counts, and morphometric measurements are presented and compared with the same characters described by Larson (2001) for all Mugilogobius. We discuss this major range extension from its natural Australian distribution, concluding it is an adventive species, probably carried across the Tasman Sea into New Zealand waters by shipping, not ocean currents. Our analysis of goby species recorded from northern New Zealand mainland waters concludes seven (86%) are probably adventive and introduced from Australia. We recommend a further survey of mangrove and saltmarsh estuary habitats to discover if this new goby has established a breeding population and is expanding its current limited distribution within northern New Zealand.
{"title":"The first record of Australian flatback mangrove goby Mugilogobius platynotus (Günther 1861) (Gobiidae; Tridentigerinae) from New Zealand","authors":"C. Roberts, A. Stewart","doi":"10.1080/00288330.2022.2074059","DOIUrl":"https://doi.org/10.1080/00288330.2022.2074059","url":null,"abstract":"ABSTRACT The eastern Australian flatback mangrove goby Mugilogobius platynotus (Günther 1861) is recorded for the first time from Aotearoa, New Zealand. Three voucher specimens (two males and one female) were collected using fish traps submerged in tidal drains of a saltmarsh wetland edged by mangroves adjacent to Ngunguru River, Northland. Key characters for identification: the colour of freshly thawed specimens, meristic counts, and morphometric measurements are presented and compared with the same characters described by Larson (2001) for all Mugilogobius. We discuss this major range extension from its natural Australian distribution, concluding it is an adventive species, probably carried across the Tasman Sea into New Zealand waters by shipping, not ocean currents. Our analysis of goby species recorded from northern New Zealand mainland waters concludes seven (86%) are probably adventive and introduced from Australia. We recommend a further survey of mangrove and saltmarsh estuary habitats to discover if this new goby has established a breeding population and is expanding its current limited distribution within northern New Zealand.","PeriodicalId":54720,"journal":{"name":"New Zealand Journal of Marine and Freshwater Research","volume":"57 1","pages":"535 - 549"},"PeriodicalIF":1.6,"publicationDate":"2022-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45020707","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-05-04DOI: 10.1080/00288330.2022.2068620
B. David, Matt G. Jarvis, D. Özkundakci, Josh Smith, I. Duggan, Sung Soo Koh, Jason M. Augspurger, T. King
ABSTRACT Larval behaviour for many of New Zealand’s diadromous freshwater fish is inadequately described. Diadromy for many amphidromous species is not obligatory however, and where conditions are suitable, freshwater larval rearing may be facilitated. Where this occurs in lakes, opportunities to document the composition and conditions supporting larval rearing exist. Boat trawling was undertaken across nine lowland lakes in the Lower Waikato over four consecutive winters with a focus on larval galaxiids. Galaxiid larvae were captured in surface water habitats in all but one lake, with banded kōkopu (Galaxias fasciatus) and giant kōkopu (Galaxias argenteus) the most common species detected. One lake, Lake Waahi, consistently resulted in the most galaxiid captures for effort expended. Analyses of larvae from this and other lakes indicated that two sizes predominated in catches and that larger, older larvae were predominantly G. fasciatus while smaller, younger larvae were predominantly G. argenteus. Stomach contents indicated that two non-native zooplankton species predominated in the diet of larvae, the Holarctic daphnia, Daphnia galeata, and the Australian calanoid copepod Boeckella symmetrica. This study provides new information regarding the timing, movement and predicted recruitment of native fish species in this river basin that has important implications for lake and river management.
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