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Consequences of nitrate enrichment in a temperate estuarine marine protected area; response of the microbial primary producers and consequences for management

Consequences of nitrate enrichment in a temperate estuarine marine protected area; response of the microbial primary producers and consequences for management
Consequences of nitrate enrichment in a temperate estuarine marine protected area; response of the microbial primary producers and consequences for management
Poole harbour is a large temperate estuary and Marine Protected Area (MPA). It is also a major site of bivalve aquaculture and is subject to rising nutrient concentrations. Dissolved inorganic nitrogen concentrations are predicted to rise in the MPA over, at least, the next 20 years mainly due to historical fertiliser applications in the catchment and therefore nitrogen enrichment will continue to modify the Poole harbour ecosystem. Nitrate enrichment clearly has consequences for the ecology of the harbour and therefore has implications for the objectives of the MPA and the way in which the MPA should be managed. Currently, the ‘primary’ consequence of nitrate enrichment is thought to be the proliferation and accumulation of green macroalgae such as Ulva due to the very high affinities of this taxa for nitrate. The consequences of nitrate enrichment for the harbour microalgae are less clear. Using new and existing datasets, we assess the response of the microbial primary producers to the ongoing nitrogen enrichment and highlight two principal features of the datasets: the high abundances of the smallest phytoplankton (picoeukaryote algae) as well as the very high abundances of nanoeukaryote algae (mostly chain-forming diatoms) which occur every summer, to a varying or lesser degree. Picoeukaryote algae have recently been recognised as a potentially significant component in the nutrition of some bivalves which may therefore contribute significantly to the growth of commercially-important bivalves in the harbour. Finally, we discuss the research needed to better understand the potential interactions between a potentially expanded shellfish aquaculture industry in Poole harbour and the desired ecological functioning of the Poole harbour MPA
685-702
Elsevier Science
Franklin, Daniel
20bd24e7-faa5-4bc5-9950-c86045fad51b
Purdie, Duncan
18820b32-185a-467a-8019-01f245191cd8
Herbert, Roger
0a2ee9ea-72cd-45e5-a1e3-894fdacd86a9
Humphries, John
410de3d7-95f4-49e3-8f39-bdfa3f539fcf
Humphreys, John
Clark, Robert
Franklin, Daniel
20bd24e7-faa5-4bc5-9950-c86045fad51b
Purdie, Duncan
18820b32-185a-467a-8019-01f245191cd8
Herbert, Roger
0a2ee9ea-72cd-45e5-a1e3-894fdacd86a9
Humphries, John
410de3d7-95f4-49e3-8f39-bdfa3f539fcf
Humphreys, John
Clark, Robert

Franklin, Daniel, Purdie, Duncan, Herbert, Roger and Humphries, John (2019) Consequences of nitrate enrichment in a temperate estuarine marine protected area; response of the microbial primary producers and consequences for management. In, Humphreys, John and Clark, Robert (eds.) Marine Protected Areas: Evidence, Policy and Practice. 1st ed. Elsevier Science, pp. 685-702.

Record type: Book Section

Abstract

Poole harbour is a large temperate estuary and Marine Protected Area (MPA). It is also a major site of bivalve aquaculture and is subject to rising nutrient concentrations. Dissolved inorganic nitrogen concentrations are predicted to rise in the MPA over, at least, the next 20 years mainly due to historical fertiliser applications in the catchment and therefore nitrogen enrichment will continue to modify the Poole harbour ecosystem. Nitrate enrichment clearly has consequences for the ecology of the harbour and therefore has implications for the objectives of the MPA and the way in which the MPA should be managed. Currently, the ‘primary’ consequence of nitrate enrichment is thought to be the proliferation and accumulation of green macroalgae such as Ulva due to the very high affinities of this taxa for nitrate. The consequences of nitrate enrichment for the harbour microalgae are less clear. Using new and existing datasets, we assess the response of the microbial primary producers to the ongoing nitrogen enrichment and highlight two principal features of the datasets: the high abundances of the smallest phytoplankton (picoeukaryote algae) as well as the very high abundances of nanoeukaryote algae (mostly chain-forming diatoms) which occur every summer, to a varying or lesser degree. Picoeukaryote algae have recently been recognised as a potentially significant component in the nutrition of some bivalves which may therefore contribute significantly to the growth of commercially-important bivalves in the harbour. Finally, we discuss the research needed to better understand the potential interactions between a potentially expanded shellfish aquaculture industry in Poole harbour and the desired ecological functioning of the Poole harbour MPA

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More information

Accepted/In Press date: 21 December 2018
Published date: 18 October 2019

Identifiers

Local EPrints ID: 441702
URI: http://eprints.soton.ac.uk/id/eprint/441702
PURE UUID: e693351e-1798-4ad8-ad2f-732a8a8a00cf
ORCID for Duncan Purdie: ORCID iD orcid.org/0000-0001-6672-1722

Catalogue record

Date deposited: 24 Jun 2020 16:30
Last modified: 23 Feb 2023 02:31

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Contributors

Author: Daniel Franklin
Author: Duncan Purdie ORCID iD
Author: Roger Herbert
Author: John Humphries
Editor: John Humphreys
Editor: Robert Clark

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