Hasil penelitian menunjukkan bahwa jumlah kemunculan Cetacea berbeda-beda tiap spesiesnya dengan total 114 kali kemunculan. Data diolah melalui aplikasi ArcGIS 10.4 dan Microsoft Office Excel. Penelitian ini dilakukan pada bulan November 2018 di perairan sekitar Teluk Kupang dan Sulamu dengan menggunakan metode pengamatan single platform yang telah dimodifikasi. Sehingga penelitian ini bertujuan untuk menganalisa keanekaragaman dan tingkah laku Cetacea yang bermigrasi. Laut Sawu menjadi tempat potensial karena dijadikan jalur migrasi berbagai spesies Cetacea secara rutin. Hal ini menunjukkan bahwa Laut Sawu merupakan area pengasuhan dan mencari makan paus. Beberapa jenis Cetacea yang menggunakan jalur migrasi melalui perairan Indonesia bagian Timur, antara lain Samudera Hindia dan Pasifik melalui perairan Kepulauan Komodo, Solor-Lembata (NTT), Laut Banda (Maluku), Sulawesi Tenggara, Sulawesi Utara dan Sorong-Fakfak (Papua). Perairan Indonesia memiliki lebih dari sepertiga jenis paus dan lumba-lumba dunia, termasuk juga beberapa jenis yang dikategorikan langka dan terancam punah. Further analysis is needed to explore morphometric differences between inshore and pelagic populations of these species, as well as ontogenetic growth between life stages. The presence of dimorphism gives insight into potential reproductive strategies and social structure. Adult pygmy killer and melon‐headed whales have subtle sexual dimorphism that can be detected using morphometrics. Results indicate that adult short‐finned pilot and false killer whales can be accurately sexed in the field or via morphometrics. Generalized linear models showed strong predictive accuracy for pilot and false killer whales, and moderate accuracy for pygmy killer and melon‐headed whales. Lastly, short‐finned pilot whales showed strong dimorphism in the leading edge, lateral positioning of the top‐most point, and height of the overhang. Pygmy killer whales showed subtle dimorphism in lateral positioning of the top‐most point and overhang. False killer whales showed no further dimorphism, while melon‐headed whales showed subtle dimorphism in dorsal fin overhang. Males of all four species had larger dorsal fins proportional to anterior body length. Sexually mature, known‐sex adult short‐finned pilot, pygmy killer, melon‐headed, and false killer whales were profiled from at‐sea photos to assess proportional fin and body dimorphism. This study confirms the absence of sexual shape dimorphism and the presence of a sexual size dimorphism in this false killer whale population.Īdults of many free‐ranging delphinid species cannot be reliably sexed at sea. Also, fluctuating asymmetry did not differ between crania of males and females. Allometric skull changes occurred in parallel for both males and females, supporting the lack of sexual shape dimorphism for this particular sample. Males showed greater overall skull size than females, whereas no sexual dimorphism could be identified in cranial and mandibular shape. A three-dimensional digitizer (Microscribe 2GX) was used to record 37 anatomical landmarks on the cranium and 25 on the mandible to investigate size and shape variation and to explore sexual dimorphism using geometric morphometric. We explored cranial morphological variation in a sample of 85 skulls belonging to a mixed sex population stranded in the Moray Firth, Scotland, in 1927. The false killer whale (Pseudorca crassidens (Owen, 1846)) is a globally distributed delphinid that shows geographical differentiation in its skull morphology. In general, they feed on a variety of oceanic squid and fish but have also been documented feeding on smaller delphinids being released from tuna purse-seines in the eastern tropical Pacific. The diet appears to be diverse, in terms of both species and size of prey. False killer whales are one of the handful of species that regularly mass strand, with the largest stranding recorded of 835 individuals.
![false killer whale false killer whale](https://mauioceancenter.com/wp-content/uploads/2018/01/Pseudorca_mother_calf_2010Oct22_RWB_0185_credit.jpg)
These oceanic habits have hindered the study of this species in the wild, and most of what is known comes from stranded individuals, captive animals, and limited observations of groups around oceanic islands. Although they are typically characterized as pelagic in habit, they do approach close to shore and utilize shallow waters around oceanic islands.
![false killer whale false killer whale](https://www.ocregister.com/wp-content/uploads/2019/03/0306_NWS_OCR-L-FALSEKILLERWHALES-03062691.jpg)
False killer whales are found in all tropical and warm temperate oceans of the world, and occasional records of their presence in cold temperate waters have been documented. The false killer whale is one of the larger members of the family Delphinidae.