scholarly journals Estimating seasonal abundance trends and survival probabilities of humpback whales in Hervey Bay (east coast Australia)

1999 ◽  
Vol 184 ◽  
pp. 291-301 ◽  
Author(s):  
M Chaloupka ◽  
M Osmond ◽  
G Kaufman
Keyword(s):  
East Coast ◽  
Seasonal Abundance ◽  
Humpback Whales ◽  
Survival Probabilities ◽  
Abundance Trends

Seasonal Occurrence and Abundance of Free-Swimming Copepod Nauplii in Narragansett Bay

1966 ◽  
Vol 23 (3) ◽  
pp. 415-422 ◽  
Author(s):  
Daniel J. Faber
Keyword(s):  
North America ◽  
Relative Abundance ◽  
East Coast ◽  
Narragansett Bay ◽  
Seasonal Abundance ◽  
Seasonal Occurrence ◽  
Individual Species ◽  
The West ◽  
Free Swimming ◽  
The Individual

Night, surface zooplankton samples at one position in the West Passage of Narragansett Bay yielded 10 calanoid, three cyclopoid, and one harpacticoid species of free-swimming copepod nauplii. The seasonal abundance of all species of nauplii combined during the 12 months of study showed significant peaks in spring and mid summer. The holoplankters were grouped into four seasonal categories: summer–fall, winter–spring, spring, and year-round; the meroplankters were put in another category. The first two groups dominated the collections. The seasonal occurrence and relative abundance of the individual species of nauplii is shown for the period of study. Included is a short synopsis of the geographical distribution of the adults along the east coast of North America as recorded in the literature.

scholarly journals Population growth of Australian East coast humpback whales, observed from Cape Byron, 1998 to 2004

2020 ◽  
pp. 261-268
Author(s):  
David A. Paton ◽  
Rric Kniest
Keyword(s):  
Population Growth ◽  
Confidence Intervals ◽  
East Coast ◽  
Megaptera Novaeangliae ◽  
Annual Rate ◽  
Humpback Whales ◽  
Survey Period ◽  
Group V ◽  
Breeding Stock ◽  
Rate Of Increase

Humpback whales (Megaptera novaeangliae) that migrate past the east coast of Australia comprise part of Group V (E(i) breeding stock). From1995 to 2004 an annual 16 day survey was conducted from Cape Byron (28°37’S, 153°38’E), the most easterly point on the Australian mainland,monitoring the peak of the humpback whale northern migration. The annual rate of increase between 1998 and 2004 of humpback whales observedoff Cape Byron is 11.0% (95% CI 2.3–20.5%). This rate of increase is consistent with that recorded from other studies of the humpback whalepopulation off the east coast of Australia. The large confidence intervals associated with this estimate are due to considerable inter-annual variationin counts. The most likely explanation for this being the short survey period, which may not have always coincided with the peak of migration, andin some years a large proportion of whales passed Cape Byron at a greater distance out to sea, making sightability more difficult.

scholarly journals Indexing seasonal abundance of humpback whales around Abrolhos Archipelago, Bahia, Brazil

2003 ◽  
Vol 2 (1) ◽  
Author(s):  
M. E. Morete ◽  
R. M. Pace, III ◽  
C. C. A. Martins ◽  
A. C. Freitas ◽  
M. H. Engel
Keyword(s):  
Seasonal Abundance ◽  
Humpback Whales

scholarly journals Abundance of East coast Australian humpback whales (Megaptera novaeangliae) in 2005 estimated using multi-point sampling and capture-recapture analysis

2020 ◽  
pp. 253-259
Author(s):  
David A. Paton ◽  
Lyndon Brooks ◽  
Daniel Burns ◽  
Trish Franklin ◽  
Wally Franklin ◽  
...  
Keyword(s):  
East Coast ◽  
Megaptera Novaeangliae ◽  
Humpback Whales ◽  
Migration Route ◽  
Closed Population ◽  
Breeding Stock ◽  
Abundance Estimate ◽  
Abundance Estimates ◽  
Capture Recapture ◽  
Near Extinction

The humpback whales (Megaptera novaeangliae) that migrate along the east coast of Australia were hunted to near extinction during the lastcentury. This remnant population is part of Breeding Stock E. Previous abundance estimates for the east Australian portion of Breeding Stock Ehave been based mainly on land-based counts. Here we present a capture-recapture abundance estimate for this population using photo-identificationdata. These data were collected at three locations on the migration route (Byron Bay – northern migration, Hervey Bay and Ballina – southernmigration) in order to estimate the population of humpback whales that migrated along the east coast of Australia in 2005. The capture-recapturedata were analysed using a variety of closed population models with a model-averaged estimate of 7,041 (95% CI 4,075–10,008) whales.

scholarly journals Interannual variability in the lipid and fatty acid profiles of east Australia-migrating humpback whales (Megaptera novaeangliae) across a 10-year timeline

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Jasmin Groß ◽  
Patti Virtue ◽  
Peter D. Nichols ◽  
Pascale Eisenmann ◽  
Courtney A. Waugh ◽  
...  
Keyword(s):  
Fatty Acid ◽  
Interannual Variability ◽  
Prey Item ◽  
Antarctic Krill ◽  
East Coast ◽  
Southern Annular Mode ◽  
Humpback Whales ◽  
Climate Indices ◽  
Fatty Acid Profiles ◽  
High Degree

Abstract Southern hemisphere humpback whales are classified as high-fidelity Antarctic krill consumers and as such are vulnerable to variability and long-term changes in krill biomass. Evidence of heterogeneous feeding patterns of east coast of Australia migrating humpback whales has been observed, warranting a comprehensive assessment of interannual variability in their diet. We examined the lipid and fatty acid profiles of individuals of the east coast of Australia migrating stock sampled between 2008 and 2018. The use of live-sampled blubber biopsies showed that fatty acid profiles varied significantly among all years. The two trophic indicator fatty acids for Antarctic krill, 20:5ω3 and 22:6ω3 remained largely unchanged across the 10-year period, suggesting that Antarctic krill is the principal prey item. A distance-based linear model showed that 33% of the total variation in fatty acid profiles was explained by environmental variables and climate indices. Most of the variation was explained by the Southern Annular Mode (23.7%). The high degree of variability observed in this study was unexpected for a species that is thought to feed primarily on one prey item. We propose that the observed variability likely arises from changes in the diet of Antarctic krill rather than changes in the whale’s diet.

Humpback Whales, Area V. An Increase in Numbers Off Australia’s East Coast

1990 ◽  
pp. 271-277 ◽  
Author(s):  
M. M. Bryden ◽  
G. P. Kirkwood ◽  
R. W. Slade
Keyword(s):  
East Coast ◽  
Humpback Whales

scholarly journals First assessment of interchange of humpback whales between Oceania and the East coast of Australia

2020 ◽  
pp. 269-274
Author(s):  
Claire Garrigue ◽  
Trish Franklin ◽  
Rochelle Constantine ◽  
Kirsty Russell ◽  
Daniel Burns ◽  
...  
Keyword(s):  
New Zealand ◽  
East Coast ◽  
New Caledonia ◽  
South Pacific ◽  
French Polynesia ◽  
American Samoa ◽  
Individual Identification ◽  
Humpback Whales ◽  
Cook Island ◽  
Breeding Grounds

The interchange of individual humpback whales between the wintering grounds of Oceania (South Pacific) and the east coast of Australia weredocumented by individual identification photographs collected from 1999 to 2004. Interchange was assessed using regional catalogues of flukephotographs, totalling 672 individuals from Oceania (represented by New Zealand, New Caledonia, Vanuatu, Fiji, Samoa, Tonga, Niue, Cook Island,French Polynesia and American Samoa) and 1,242 individuals from Hervey Bay and Byron Bay representing the southbound and the northboundmigration along the east coast of Australia (EA). Overall, there were seven documented movements between EA and Oceania. Four instances ofmovement of four individuals were documented between EA and the closest breeding grounds of New Caledonia. A further three movements wererecorded between EA and a small catalogue (n = 13) from the New Zealand migratory corridor. In contrast, during this same period, 20 cases ofinterchange were documented among nine breeding grounds: French Polynesia, Cook Islands, Niue, American Samoa, Samoa, Tonga, Fiji, Vanuatuand New Caledonia. The low level of interchange between Oceania and the east coast of Australia has important implications for understanding thestock structure and abundance of humpback whales in the South Pacific.

Determination of Age in the Humpback Whale, Megaptera nodosa (Bonnaterre)

1959 ◽  
Vol 10 (2) ◽  
pp. 125 ◽  
Author(s):  
RG Chittleborough
Keyword(s):  
East Coast ◽  
Age Distribution ◽  
Age Determination ◽  
Humpback Whales ◽  
Similar Distribution ◽  
The West ◽  
The Mean ◽  
Sexually Mature ◽  
Rate Of Accumulation

The use of baleen, ear plugs, and ovaries in the determination of age in humpback whales is described. From the evidence of baleen, the majority of humpback whales reach puberty at 4 or 5 years of age. The rate of accumulation of laminations in ear plugs is two laminations per year. The mean rate of ovulation in sexually mature females is 1.1 per year. Age determination upon the same sample of mature females by these two methods gives very similar distribution of ages. The age distribution within separate sexes from samples of mature humpback whales examined on the west and east coasts of Australia in 1957 are compared. The results indicate that the population migrating along the west coast is at present composed of younger individuals than that on the east coast of Australia.

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