Size in Square Kilometres
Qualifying Species and Criteria
Māui dolphin – Cephalorhynchus hectori maui
Hector’s dolphin – Cephalorhynchus hectori
Pygmy blue whale – Balaenoptera musculus brevicauda
Criterion A; C (2, 3); D (1)
New Zealand fur seal – Arctocephalus forsteri
Criterion C (1)
Antarctic blue whale – Balaenoptera musculus intermedia
Humpback whale – Megaptera novaeangliae
Criterion A; C (3)
Fin whale – Balaenoptera physalus
Sei whale – Balaenoptera borealis
Sperm whale – Physeter macrocephalus
Southern right whale – Eubalaena australis
Criterion C (3)
Common dolphin – Delphinus delphis
Criterion C (2)
Killer whale – Orcinus orca
Criterion D (1)
Marine Mammal Diversity
Criterion D (2)
Globicephala melas, Caperea marginata, Tasmacetus shepherdi, Mesoplodon bowdoini, Balaenoptera bonaerensis, Berardius arnuxii, Tursiops truncatus, Balaenoptera edeni, Lobodon carcinophaga, Ziphius cavirostris, Lagenorhynchus obscurus, Pseudorca crassidens, Mesoplodon ginkgodens, Mesoplodon grayi, Mesoplodon hectori, Hydrurga leptonyx, Stenella attenuata, Kogia breviceps, Grampus griseus, Steno bredanensis, Globicephala macrorhynchus, Hyperoodon planifrons, Mirounga leonine, Lissodelphis peronii, Phocoena dioptrica, Mesoplodon layardii, Stenella coeruleoalba
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The South Taranaki Bight mostly comprises shallow shelf waters (~100-120m) and is strongly influenced by a nutrient-rich upwelling system. Over 35 different marine mammal species have been documented within the region including at least eight species or subspecies with IUCN threatened or vulnerable status (e.g. Māui dolphins, Antarctic blue whale – both CR, Hector’s dolphin, pygmy blue whale, Oceania sub-population humpback whale, sei whale – all four EN, fin whale, sperm whale – both VU). New Zealand pygmy blue whales are a genetically distinct and isolated population with year-round presence in the region, which is a critical foraging ground. Hector’s dolphins and Māui dolphin occur in the coastal waters of the South Taranaki Bight. The IMMA which is used as a migratory corridor for humpback, blue, and southern right whales, and includes colonies of New Zealand fur seals. The South Taranaki Bight region has relatively high levels of anthropogenic activities.
Description of Qualifying Criteria
Criterion A – Species or Population Vulnerability
There are eight species or subspecies found in the IMMA that meet this criterion with IUCN threatened or vulnerable status (e.g. Maui dolphins (CR), Antarctic blue whale (CR), Hector’s dolphin (EN), pygmy blue whale (EN), humpback whale (Oceania sub-population; EN), sei whale (EN), fin whale (VU), sperm whale (VU)). All these species have been reported from the IMMA (e.g. DOC Marine Mammal Sighting and Stranding database 2020) and this IMMA forms an important part of their range within New Zealand. The IMMA forms an important feeding area for a range of marine mammal species with the Kahurangi upwelling system recognised as a highly productive source of food for marine mammals within the area.
Criterion C: Key Life Cycle Activities
Sub-criterion Ci: Reproductive Areas
Important New Zealand fur seal breeding colonies (e.g. Kahurangi Point, Steep Point, Wekakura Point) occur along the north west coast of the South Island whose coastal and offshore feeding (particularly for nursing females) are constrained to feeding completely within the IMMA during the breeding season (Baker et al. 2010). The region is also likely to be important for a range of other species (e.g. Hector’s, blue whales, southern right whales, pilot whales, common dolphins) which have been observed with young calves in the region but for which there is little systematic information (DOC Marine Mammal Sighting and Stranding database 2020).
Sub-criterion Cii: Feeding Areas
The Kahurangi upwelling system sustains high productivity in the South Taranaki Bight region leading to high densities of krill biomass that make the area an important feeding area for pygmy blue whales (Torres 2013, Barlow et al. 2018; Barlow et al. 2020) and may also be important for other species including fin, sei and potentially Bryde’s whales. This same system also likely provides important feeding grounds for long finned pilot whales, pygmy right whales and Shepherd’s beaked whales which are reported from regular visual sightings and / or stranding records from the IMMA (DOC Marine Mammal Sighting and Stranding database 2020). Common dolphins are also regularly reported from the IMMA including regular bycatch in commercial trawl fisheries providing strong indication that this is an important feeding area for them (MPI 2017). Various other species (e.g. Hector’s, blue whales, fur seals, sperm whales, southern right whales, pilot whales, common dolphins) have also been recorded feeding in this area but there is little information available about these species (DOC Marine Mammal Sighting and Stranding database 2020).
Sub-criterion Ciii: Migration Routes
Historical whaling data confirms this IMMA as an important migration route for humpback whales and southern right whales (Dawbin 1956, Richards et al. 2009). Recent records have also confirmed that this IMMA still contains important migratory pathways for humpback, southern right whales, and blue whales (Bott et al. 2017, Carroll et al. 2013, Barlow et al. 2021, Goetz et al. 2018). While there is little data for other species, it is likely that this IMMA is also important for other species such as fin, sei, sperm and Bryde’s whales.
Criterion D: Special Attributes
Sub-criterion Di: Distinctiveness
The pygmy blue whales of New Zealand are genetically distinct from all other populations in the Southern Hemisphere (Barlow et al. 2018). Furthermore, no matches had been made between a photo-id catalogue of 174 New Zealand blue whales and photo-id images of blue whales captured in Australia (n = 197) or Antarctic (n = 65) (Barlow et al. 2018). Also, killer whales in New Zealand are considered distinctive to other killer whales around the Southern Hemisphere (Baker et la. 2019).
Sub-criterion Dii: Diversity
This IMMA supports a wide range of marine mammal species including over 35 different marine mammal species recorded including the main species such as Māui dolphin, Hector’s dolphin, pygmy blue whale, New Zealand fur seal, humpback whale, sperm whale, southern right whale, common dolphin and and killer whale (e.g. DOC Marine Mammal Sighting and Stranding database 2020). Other species recorded further include Andrew’s beaked whale, antarctic minke whale, Arnoux’s Beaked whale, common bottlenose dolphin, Bryde’s whale, crabeater seal, Cuvier’s beaked whale, dusky dolphin, false killer whale, ginkgo-toothed beaked whale, Gray’s beaked whale, Hector’s beaked whale, leopard seal, pantropical spotted dolphins, pygmy sperm whale, Risso’s dolphin, rough toothed dolphin, short-finned pilot whale, southern bottlenose whale, southern elephant seal, southern right whale dolphin, spectacled porpoise, strap-toothed beaked whale, striped dolphin, and the presence of other unrecorded species highly likely.
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