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NRLD - 329835 | Megaptera novaeangliae

Assessment ID
329835
Taxon name
Megaptera novaeangliae
(Borowski, 1781)
Uploaded by
National Red List Database
Taxonomic information
Scientific name
Megaptera novaeangliae
(Borowski, 1781)
Assessed taxon level
Species
Higher level taxonomic groupings
Vertebrates
Mammals
Kingdom
Animalia
Phylum
chordata
Class
mammalia
Order
cetartiodactyla
Family
balaenopteridae
Genus
Megaptera
Species
novaeangliae
Species authority
(Borowski, 1781)
Taxonomic notes and synonyms listed
The Committee on Taxonomy of the Society for Marine Mammalogy recognizes three subspecies of Humpback Whale: the nominate subspecies M. n. novaeangliae (Borowski, 1781) refers to the North Atlantic Humpback Whale; M. n. australis (Lesson, 1828) is the Southern (Hemisphere) Humpback Whale; and M. n. kuzira (Gray, 1850) is the North Pacific Humpback Whale (Committee on Taxonomy 2017). This is based on the finding that Humpback Whales in the three ocean basins, although not separate clades, appear to be on diverging genetic trajectories (Jackson et al. 2014). The Arabian Sea contains a genetically isolated population of Humpback Whales (Pomilla et al. 2014), which is also assessed on the Red List separately as a subpopulation (Minton et al. 2008).
Location and scope
Specific locality or subnational name or regional name
United Arab Emirates (the)
Scope (of the Assessment)
National
Countries included within the scope of the assessment
United Arab Emirates (the)
Country ISO code(s)
ARE
Does the assessment cover a marine EEZ area(s)?
Not_assigned
Conservation Status
Assessed as
Endangered
Abbreviated status
EN
Qualifying criteria (if given)
D
Criteria system used
IUCN

(see Assessment details)

Assessment rationale/justification
Based on the confirmed sightings of this species in UAE waters (see under Geographic Range below), the population size suspected to be less than 50 mature individuals thus qualifying the species for a Critically Endangered assessment under criterion D. However, all animals found in UAE waters are most likely part of the Arabian Sea Humpback Whale subpopulation, so there may be ongoing movement of individuals from the waters off Oman into UAE waters, hence the population is subject to a rescue effect. The regional assessment is therefore adjusted downwards by one category to Endangered (EN*) under criterion D.
Assessment details
Year assessed
2018
Assessors/contributors/reviewers listed
UAE National Red List Workshop
Criteria system used
IUCN
Reference for methods given
IUCN. 2012. IUCN Red List Categories and Criteria: Version 3.1, Second edition. IUCN, Gland, Switzerland and Cambridge, UK. iv + 32pp pp. And IUCN. 2012. Guidelines for Application of IUCN Red List Criteria at Regional and National Levels: Version 4.0. Gland, Switzerland and Cambridge, UK: IUCN. iii + 41pp.
Further information
Endemism (according to assessment)
Endemic to region
Not assigned
Taxon distribution as listed in assessment
This species is rarely recorded in UAE waters. It has occasionally been recorded off the East Coast (Baldwin 1995). An examination of whales reported in the Gulf since 1883 confirmed eight records of Humpback Whales, including Holocene remains of one specimen from Abu Dhabi, but none of the other seven records was from UAE (Dakteh et al. 2017). Four of the records were from Iran. Two strandings and one sighting of a mother-calf pair also have been recorded for the Gulf of Oman coast of Iran (Braulik et al. 2010, Owfi et al. 2015). A number of sightings have also been recently reported off the coast of Pakistan (Moazzam and Nawaz 2017). The last known sighting on the east coast was in 1979 at Khor Fakkan though this species is likely to travel past this shoreline from time to time. On 9 October 2017, a number of sightings and video recording of a mother Humpback and calf off the coast of Dubai were reported to the UAE Dolphin Project (<a href=""http://www.uaedolphinproject.org"">www.uaedolphinproject.org</a>), the first recent record of live Humpback Whales in the Gulf. These sightings support the hypothesis (Dakteh et al. 2017) that the Gulf may be part of the natural home range of the Arabian Sea Humpback subpopulation and reconfirm the importance of regional collaboration on conservation efforts. It is also one of the very few occasions that a mother and a calf of this species have been observed in the region in the past 20 years. The Arabian Sea Humpback Whale (ASHW) subpopulation is the only one known in the region. There are a number of records for the northwest Gulf of Oman near the entrance of the Strait of Hormuz (Baldwin et al. 1999, Minton et al. 2011, Pomilla et al. 2014) and it is a reasonable assumption that a this is a single stock with continuous distribution into the Gulf (Dakteh et al. 2017). Whaling data and recent scientific research confirm that the ASHW subpopulation is small and isolated (Minton et al. 2011). The known distribution includes the waters of the UAE, Qatar, Oman, Yemen, Iran, Pakistan and India with potential for occurrence in other states of the North Indian Ocean region, but so far almost all data comes from Oman (Mikhalev 2000, Baldwin 2000, Minton et al. 2011). Research completed over the past two decades in Oman provides compelling evidence that the ASHW population is the world's most isolated and genetically distinct population of humpback whales, separated from conspecifics for an estimated 70,000 years (Pomilla et al. 2014). It is also the smallest and most endangered subpopulation of this species. The available scientific data clearly indicate that ASHWs remain within the Northern Indian Ocean year-round and are isolated from Southern Indian Ocean populations (Minton et al. 2011, Pomilla et al. 2014). However, their movements within the Arabian Sea remain poorly understood, due to a lack of dedicated research effort in any range state other than Oman. Humpback Whales in all other populations migrate between distinct feeding and breeding grounds that are typically separated by thousands of kilometres, and it is reasonable to assume that ASHWs engage in at least some level of transboundary movement between the waters of the range states where they have been documented to occur. This is supported by a recent record in 2017 of a female whale recorded with satellite telemetry crossing from Oman to India, and back. The tracked whale, after spending a few weeks engaged in small-scale movements in the Gulf of Masirah (Oman), then suddenly headed across the Arabian Sea to a location just off the coast of Goa, India reaching later the southernmost tip of India, before returning to Oman. There are two records of this species northwest of the UAE in the Arabian Gulf. It is still reported in the Arabian Gulf and the Gulf of Oman, but nearshore development and fishing pressure may have reduced its former range here (Baldwin 2005) and it is more often recorded in the Arabian Sea though even here it is rare. Globally, the Humpback Whale is found in all the major ocean basins. All subpopulations except the one in the Arabian Sea migrate between mating and calving grounds in tropical waters, usually near continental coastlines or island groups, and productive colder waters in temperate and high latitudes (Reilly et al. 2008b).
Is there a map available in assessment?
Yes
Habitat and systems
Ecological system type
Terrestrial
Not_assigned
Freshwater
Not_assigned
Marine
Not_assigned
Habitat
Habitat details as listed in assessment
The species is mostly found in shallow, coastal waters, though also occurs in deep offshore water.
Threats and conservation measures listed
Threats listed in assessment
The main threats to cetaceans in UAE waters include: incidental mortality in trawl and drift nets, depletion of prey populations (due in part to commercial overfishing); ship and boat strikes, offshore oil and gas exploration; noise from shipping, submarine sonar and oil and gas rigs (IWC 2016). Illegal Soviet whaling resulted in the capture of 242 Humpback Whales in Arabian seas in the mid-1960s (Mikhalev 2000). Current threats to Humpback whales are widespread and include fisheries entanglements (Minton et al. 2011, Anderson 2014, Moazzam and Nawaz 2014, Willson et al. 2016), ship strikes (Wilson et al. 2016), and pollution (Baldwin et al. 2010, Dakteh et al. 2017). Thirty to forty percent of Humpback Whales off of the coast of Oman displayed scars consistent with fishing gear interaction (Minton et al. 2011). ASHW may also be more susceptible to disease: nearly 70% of examined whales from the Soviet catches in the Arabian Sea in the 1960s showed liver anomalies (Mikhalev 2000) and over 20% of whales examined from Oman displayed signs of tattoo-like skin disease (Van Bressem et al. 2014). This population of whales may also be more vulnerable to climate change if shifts in oceanographic conditions affect productivity or prey distribution in their restricted Northern Indian Ocean range (Thomas et al. 2016).
History
The backcasted 1996 assessment for this species is Endangered which differs from the Data Deficient assessment by Hornby (1996).
Publication
Mallon, D., Hilton-Taylor, C., Allen, D., & Harding, K. (2019). UAE National Red List of Mammals: Marine and Terrestrial. A report to the Ministry of Climate Change and Environment, United Arab Emirates (p. 41). IUCN Global Species Programme. https://bit.ly/2RdZCQR