scholarly journals Occurrence and distribution of humpback whales (Megaptera novaeangliae) on the north coast of the State of Bahia, Brazil, 2000–2006

2008 ◽  
Vol 65 (4) ◽  
pp. 667-673 ◽  
Author(s):  
Marcos R. Rossi-Santos ◽  
Elitieri S. Neto ◽  
Clarêncio G. Baracho ◽  
Sérgio R. Cipolotti ◽  
Enrico Marcovaldi ◽  
...  
Keyword(s):  
The State ◽  
Megaptera Novaeangliae ◽  
Humpback Whales ◽  
North Coast ◽  
Brazilian Coast ◽  
Sampling Effort ◽  
Southwest Atlantic ◽  
The North ◽  
Commercial Whaling ◽  
Geographical Position

Abstract Rossi-Santos, M. R., Neto, E. S., Baracho, C. G., Cipolotti, S. R., Marcovaldi, E., and Engel, M. H. 2008. Occurrence and distribution of humpback whales (Megaptera novaeangliae) on the north coast of the State of Bahia, Brazil, 2000–2006. – ICES Journal of Marine Science, 65: 667–673. The Abrolhos Bank off Brazil is considered the main breeding ground for the humpback whale (Megaptera novaeangliae) in the Southwest Atlantic. However, owing to an increase in the occurrence of the species along the north coast of the State of Bahia, it has been suggested that the species is reoccupying that region, which was probably utilized by the whales before commercial whaling. Information is presented on the occurrence and distribution of humpback whales along the north coast of the State of Bahia, with a comparative overview, for the period 2000–2006. Daily research cruises were conducted from July to October, departing from Praia do Forte (13°40′S 38°10′W) and lasting ∼9 h. Data on sampling and sighting effort, and geographical position and composition of groups of humpback whales, were collected on standardized field sheets. In all, 230 surveys were performed, covering some 9740 nautical miles in 1645 h of sampling effort, during which 1626 humpback whales were sighted, including 118 calves. Humpback whales were sighted throughout the study area. Solitary individuals and pairs were the most frequent group composition, 26% and 37% of the observed groups (n = 723), respectively. Depth of water varied from 15 to 1657 m (mean = 62.4; s.d. = 99). The sightings values were grouped into depth classes to ascertain the highest frequencies (∼30%) for the two classes, i.e. between 35.1 and 55 m of water. There was an increase in the encounter rates of humpback whales on the north coast of the State of Bahia between 2000 and 2006, identifying a difference in SPUE [sightings per unit (h) of effort] among years (Kruskal–Wallis H = 30.155, d.f. = 6, p < 0.05). The results support the hypothesis that humpback whales are reoccupying former breeding areas along the Brazilian coast.

Interspecific cetacean interactions during the breeding season of humpback whale (Megaptera novaeangliae) on the north coast of Bahia State, Brazil

2009 ◽  
Vol 89 (5) ◽  
pp. 961-966 ◽  
Author(s):  
Marcos R. Rossi-Santos ◽  
Elitieri Santos-Neto ◽  
Clarêncio G. Baracho
Keyword(s):  
Breeding Season ◽  
Megaptera Novaeangliae ◽  
Humpback Whales ◽  
North Coast ◽  
Balaenoptera Acutorostrata ◽  
Cetacean Species ◽  
The North ◽  
Eastern Brazil ◽  
North Eastern ◽  
Stenella Attenuata

The large majority of cetacean interspecific studies report only on dolphin interactions, while studies on interactions between odontocete and mysticete are less common. The present work aims to report on sightings of cetacean interactions, during the breeding season of humpback whales(Megaptera novaeangliae), along 370 km of the Bahia State, north-eastern Brazil, addressing aspects of cetacean distribution and behaviour. During 7 seasons (2000–2006), a total of 230 research cruises were performed, in which 38 events of interactions among humpback whales and other cetaceans(Tursiops truncatus, Steno bredanensis, Peponocephala electraandBalaenoptera acutorostrata)were observed, plus another 5 encounters without the whale's presence, includingT. truncatus, S. bredanensis, P. electra, Stenella clymeneandStenella attenuata. Our results confirm the occurrence of multiple cetacean species in the Bahia State, being the first study in the world to report on a large range of interactions involving another 4 cetacean species, grouped with up to 3 mixed species per sighting, with humpback whales in their annual breeding ground.

scholarly journals Behavior of humpback whales, Megaptera novaeangliae (Cetacea: Balaenopteridae): comparisons between two coastal areas of Brazil

2008 ◽  
Vol 25 (2) ◽  
pp. 159-164 ◽  
Author(s):  
Diana G. Lunardi ◽  
Márcia H. Engel ◽  
Regina H. F. Macedo
Keyword(s):  
Group Composition ◽  
Coastal Areas ◽  
Reproductive Period ◽  
The State ◽  
Megaptera Novaeangliae ◽  
Humpback Whales ◽  
Behavior Patterns ◽  
Northern Coast ◽  
Behavioral Differences

Behavior of humpback whales was observed during the reproductive period off the northern coast of the state of Bahia (NB, n = 378 groups) and at the Abrolhos Bank (AB, n = 919) to compare patterns and group composition between the two locations. Alone individuals and dyads were most often encountered in both areas, although mother-calf pairs were more common in AB. While these two regions comprise distinct concentrations of humpback whales, with intrinsic environmental differences, behavior patterns were quite similar. The only behavioral differences found where for "tail up" and "resting". The patterns found here may reflect differences in the protection status of the areas or intrinsic environmental differences.

Biemna trisigmata sp. n., a new sponge from the North coast of Brazil (Demospongiae, Poecilosclerida)

Zootaxa ◽  
2004 ◽  
Vol 639 (1) ◽  
pp. 1 ◽  
Author(s):  
Beatriz Mothes ◽  
Maurício A. De Campos
Keyword(s):  
New Species ◽  
North Coast ◽  
Brazilian Coast ◽  
The North ◽  
A New Species

A new species of Biemna Gray, 1867, B. trisigmata sp. n., is described from the northern Brazilian coast, Amap State. The new species is compared to other tropical West Atlantic species of Biemna, from which it differs in having three categories of sigmas and two categories of microxeas.

scholarly journals Fluctuating reproductive rates in Hawaii's humpback whales, Megaptera novaeangliae , reflect recent climate anomalies in the North Pacific

2019 ◽  
Vol 6 (3) ◽  
pp. 181463 ◽  
Author(s):  
R. Cartwright ◽  
A. Venema ◽  
V. Hernandez ◽  
C. Wyels ◽  
J. Cesere ◽  
...  
Keyword(s):  
Climate Change ◽  
North Pacific ◽  
Megaptera Novaeangliae ◽  
Anthropogenic Climate Change ◽  
Humpback Whales ◽  
Encounter Rates ◽  
The North ◽  
The Impact ◽  
The North Pacific ◽  
Population Segment

Alongside changing ocean temperatures and ocean chemistry, anthropogenic climate change is now impacting the fundamental processes that support marine systems. However, where natural climate aberrations mask or amplify the impacts of anthropogenic climate change, identifying key detrimental changes is challenging. In these situations, long-term, systematic field studies allow the consequences of anthropogenically driven climate change to be distinguished from the expected fluctuations in natural resources. In this study, we describe fluctuations in encounter rates for humpback whales, Megaptera novaeangliae , between 2008 and 2018. Encounter rates were assessed during transect surveys of the Au'Au Channel, Maui, Hawaii. Initially, rates increased, tracking projected growth rates for this population segment. Rates reached a peak in 2013, then declined through 2018. Specifically, between 2013 and 2018, mother–calf encounter rates dropped by 76.5%, suggesting a rapid reduction in the reproductive rate of the newly designated Hawaii Distinct Population Segment of humpback whales during this time. As this decline coincided with changes in the Pacific decadal oscillation, the development of the NE Pacific marine heat wave and the evolution of the 2016 El Niño, this may be another example of the impact of this potent trifecta of climatic events within the North Pacific.

Site fidelity and residence times of humpback whales (Megaptera novaeangliae) on the Brazilian coast

2012 ◽  
Vol 92 (8) ◽  
pp. 1783-1791 ◽  
Author(s):  
Clarêncio G. Baracho-Neto ◽  
Elitieri Santos Neto ◽  
Marcos R. Rossi-Santos ◽  
Leonardo L. Wedekin ◽  
Mariana C. Neves ◽  
...  
Keyword(s):  
Residence Time ◽  
Site Fidelity ◽  
Megaptera Novaeangliae ◽  
Humpback Whales ◽  
Brazilian Coast ◽  
Northern Coast ◽  
Occupancy Rate ◽  
Breeding Grounds ◽  
Minimum Number ◽  
Using Data

Humpback whales (Megaptera novaeangliae) migrate between their feeding grounds, located in high latitudes, and their breeding grounds, located in low latitudes, exhibiting certain levels of site fidelity to their migratory destinations. The residence time, also known as occupancy rate, can be defined as the minimum number of days that those individuals remained in the same area. In this paper, site fidelity and residence time of humpback whales that breed off the northern coast of Bahia, Brazil were investigated. Data were collected between 2000 and 2009 on-board research cruises and whale watching vessels. This paper also studies possible differences between males and females with respect to site fidelity off the Brazilian coast, using data collected since 1989. A total of 841 whales were photo-identified. The vast majority of the whales (96%, N = 809) were seen only once in the studied area, while 4% (32 individuals) were seen twice. Most of the resights occurred within the same season (72%, N = 23), while 9 resights (28%) occurred in different years. None of the individuals were seen more than twice. The average site fidelity rate was 1% and the occupancy rate varied from one up to 21 days (mean = 5.3; SD = 5.4, N = 23).

scholarly journals Satellite-monitored movements of humpback whales Megaptera novaeangliae in the Southwest Atlantic Ocean

2006 ◽  
Vol 313 ◽  
pp. 295-304 ◽  
Author(s):  
AN Zerbini ◽  
A Andriolo ◽  
MP Heide-Jørgensen ◽  
JL Pizzorno ◽  
YG Maia ◽  
...  
Keyword(s):  
Atlantic Ocean ◽  
Megaptera Novaeangliae ◽  
Humpback Whales ◽  
Southwest Atlantic

scholarly journals Considerações sobre estromatólito do tipo domal da Lagoa Salgada, Estado do Rio de Janeiro, Brasil

2007 ◽  
Vol 30 (1) ◽  
pp. 50-57
Author(s):  
Loreine Hermida Silva e Silva ◽  
Anderson Andrade Cavalcanti Iespa ◽  
Cynthia Moreira Damazio-Iespa
Keyword(s):  
Rio De Janeiro ◽  
The State ◽  
North Coast ◽  
Carbonate Precipitation ◽  
Mollusk Shells ◽  
The Third ◽  
The North ◽  
Internal Morphology

The lagoa Salgada is situated on the north coast of the State of Rio de Janeiro, between the districts of Campos dos Goytacazes and São João da Barra, at 41º00'30'' W and 21º54'10''S. In the margins of the lagoon the presence of recent stromatolitic constructions was verified. The stromatolite may be defined as lithified biosedimentary structure, growing through the increase of sediment blade trapping by the carbonate precipitation as result of microbian organism activity. The objective of this study was to describe and to determine the internal morphology of domal type stromatolite of the lagoa Salgada. Through cutting, three different stages were observed: the first (base) is present as a thrombolitic stage with spread blade; the second (intermediary) is a thrombolitic-stromatolitic stage with spread and continuous blade; the third (top) is stromatolitic and the most recent stage of the structure, presenting continuous blade and with interruptions rare. Besides the presence of cyanobacteria and mollusk shells, were observed also internee palinomorphs inside the domal stromatolite. It was possible to observe that filament cyanobacteria contributed to the formation of blade of domal stromatolite and the microgastropod contributed for the destruction of the blade.

scholarly journals The deep sea teleost fish fauna of the Brazilian North Coast

2020 ◽  
Vol 18 (3) ◽  
Author(s):  
Alex Garcia Cavalleiro de Macedo Klautau ◽  
Israel Hidenburgo Aniceto Cintra ◽  
Matheus Marcos Rotundo ◽  
Alfredo Carvalho-Filho ◽  
Rodrigo Antunes Caires ◽  
...  
Keyword(s):  
Deep Sea ◽  
Fish Fauna ◽  
North Coast ◽  
Brazilian Coast ◽  
Northern Coast ◽  
Commercial Fish ◽  
The North ◽  
Species Lists ◽  
Sea Fish ◽  
Photographic Records

Abstract Data on the deep sea fishes found off the northern Brazilian coast are restricted to the results of the surveys of the RV Oregon, a research vessel of the North American National Marine Fisheries Service, and the REVIZEE Program. The REVIZEE Score-Norte Program focused on commercial fish species and natural resources with potential for exploitation on the continental shelf and slope off the northern coast of Brazil. In this sense, the REVIZEE Score-Norte Program generated little information on species of no commercial value, did not catalog its inventory in zoological collections, and did not publish species lists. Given this considerable knowledge gap on the deep-sea fish found off the North coast of Brazil, we compiled all the available data on the deep-sea fish of this region and also retrieved photographic records from the REVIZEE Score-Norte Program, including the PRODEMERSAL and PROTUNA projects. Considering the published records, specimens deposited in zoological collections, and the interpretation of photographic records, we compiled a list of 63 species of deep-sea fish from the North coast of Brazil. An additional 30 species were found in the published records from the PRODEMERSAL and PROTUNA, but were considered to be doubtful or pending confirmation.

The genera Acaromantis and Simognathus (Simognathinae, Halacaridae) on the north coast of São Paulo State, Brazil

Zootaxa ◽  
2004 ◽  
Vol 615 (1) ◽  
pp. 1 ◽  
Author(s):  
ALMIR ROGÉRIO PEPATO ◽  
CLÁUDIO GONÇALVES TIAGO
Keyword(s):  
New Species ◽  
First Record ◽  
Sao Paulo ◽  
North Coast ◽  
Brazilian Coast ◽  
São Paulo ◽  
Paulo State ◽  
The North ◽  
Two New Species ◽  
São Paulo State

This is the first record of the subfamily Simognathinae for the Brazilian coast. Two new species are described, Acaromantis vespucioi sp. nov. and Simognathus euphractus sp. nov. The description of Simognathus fuscus Viets, 1936 is extended with the inclusion of juveniles description.

Sign in / Sign up

Export Citation Format

Share Document