High spatial variability in a species-rich assemblage of diadromous fishes in Hong Kong, southern China.

Gobiidae conservation diadromy marine and freshwater habitats migration seasonality

Journal

Journal of fish biology
ISSN: 1095-8649
Titre abrégé: J Fish Biol
Pays: England
ID NLM: 0214055

Informations de publication

Date de publication:
03 Jun 2024
Historique:
revised: 09 05 2024
received: 15 12 2023
accepted: 11 05 2024
medline: 4 6 2024
pubmed: 4 6 2024
entrez: 4 6 2024
Statut: aheadofprint

Résumé

China has experienced substantial coastal reclamation and damming of rivers. These changes have the potential to impact migrations of diadromous fishes between the sea and fresh waters, but the composition of these fishes and the impacts of barriers to their movement in China have received little attention. We inventoried the species composition and distribution of diadromous fishes, and the impacts of barriers on them, in the Hong Kong Special Administrative Region (HKSAR), southern China. Fish assemblages were surveyed using hand-nets, supplemented by cast-netting and single-pass snorkel surveys, in 24 small coastal streams across three regions. Surveys were undertaken on multiple occasions during the wet and dry seasons to account for the monsoonal tropical climate. Twenty-eight diadromous fishes were collected, mostly gobies, amounting to over half (53%) of the total richness of primary freshwater fishes; four additional species are known from literature records. Diadromous richness was 48% greater during the wet season, when all species were encountered. Richness varied substantially among streams, from a maximum of 17 (2 streams that were diversity hot spots) to none (3 streams). The most widespread diadromous fish was Glossogobius giuris (71% frequency of occurrence), followed by Mugil cephalus (58% occurrence) and Eleotris oxycephala (50% occurrence). The remaining 25 diadromous fishes occurred in fewer than half of the streams; 12 species were confined to a single stream and may be locally threatened. There were conspicuous spatial differences in diadromous assemblages across HKSAR, despite its limited extent (1114 km

Identifiants

pubmed: 38831621
doi: 10.1111/jfb.15812
doi:

Types de publication

Journal Article

Langues

eng

Sous-ensembles de citation

IM

Subventions

Organisme : Lantau Conservation Fund
ID : LCF-RE-2021-02

Informations de copyright

© 2024 The Author(s). Journal of Fish Biology published by John Wiley & Sons Ltd on behalf of Fisheries Society of the British Isles.

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Auteurs

Jeffery C F Chan (JCF)

School of Biological Sciences, The University of Hong Kong, Pok Fu Lam, Hong Kong.
Science Unit, Lingnan University, Tuen Mun, Hong Kong.

Jia Huan Liew (JH)

School of Natural Sciences, University of Tasmania, Hobart, Tasmania, Australia.

David Dudgeon (D)

School of Biological Sciences, The University of Hong Kong, Pok Fu Lam, Hong Kong.

Classifications MeSH