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Relevant bibliographies by topics / Sightings along transect

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Journal articles

Academic literature on the topic 'Sightings along transect'

Author: Grafiati

Published: 3 June 2025

Last updated: 31 July 2025

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Journal articles on the topic "Sightings along transect"

1

Moore, Sue E., Janice M. Waite, Lori L. Mazzuca, and Roderick C. Hobbs. "Mysticete whale abundance and observations of prey associations on the central Bering Sea shelf." J. Cetacean Res. Manage. 2, no. 3 (2023): 227–34. http://dx.doi.org/10.47536/jcrm.v2i3.912.

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Visual surveys for cetaceans were conducted along transect lines in the central Bering Sea in association with a groundfish stock assessment survey from 5 July to 5 August 1999. There were 125 sightings of single or groups of mysticete whales during 6,043km of survey effort. Fin whales were most common (60% of all sightings), with distribution clustered along the outer continental shelf break near the 200m isobath. In addition, there were 27 sightings of minke whales and 17 sightings of humpback whales. Minke whales were primarily found along the upper slope in water 100-200m deep, while humpb

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2

Read, Andrew J., Susan Barco, Joel Bell, et al. "Occurrence, distribution and abundance of cetaceans in Onslow Bay, North Carolina, USA." J. Cetacean Res. Manage. 14, no. 1 (2023): 23–35. http://dx.doi.org/10.47536/jcrm.v14i1.520.

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In this paper the occurrence, distribution and abundance of cetaceans in offshore waters of Onslow Bay, North Carolina, USA is described. Between June 2007 and June 2010 monthly aerial and shipboard line-transect surveys were conducted along ten 74km transects placed perpendicular to the shelf break. In total 42,676km of aerial trackline (218 sightings) and 5,209km of vessel trackline (100 sightings) were observed. Seven species of cetaceans were observed, but the fauna was dominated strongly by common bottlenose and Atlantic spotted dolphins. Both species were present year-round in the study

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3

Jean, Claire, Stéphane Ciccione, Katia Ballorain, Jean-Yves Georges, and Jérôme Bourjea. "Ultralight aircraft surveys reveal marine turtle population increases along the west coast of Reunion Island." Oryx 44, no. 2 (2010): 223–29. http://dx.doi.org/10.1017/s003060530999072x.

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AbstractReunion Island in the south-west Indian Ocean once had significant nesting populations of marine turtles but they declined rapidly after human colonization. In 1996, after regular sightings of turtles offshore, an aerial survey programme was initiated to monitor the occurrence of marine turtles and their distribution along the west coast of the island. Between 1998 and 2008, along a 30-km coastline transect between Saint Leu and Saint Paul, a total of 1,845 marine turtle sightings were recorded during 146 flights with an ultralight aircraft. The mean number of turtle sightings per surv

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4

Waring, Gordon T., Leif Nottestad, Erik Olsen, Henrik Skov, and Gisli Vikingsson. "Distribution and density estimates of cetaceans along the midAtlantic Ridge during summer 2004." J. Cetacean Res. Manage. 10, no. 2 (2023): 137–46. http://dx.doi.org/10.47536/jcrm.v10i2.648.

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During 4 June-2 July 2004, the Norwegian R/V G.O. Sars conducted a multi-disciplinary survey along the mid-Atlantic Ridge (MAR) from the Reykjanes Ridge to north of the Azores. This provided the first systematic survey information on MAR cetacean populations. Using naked eye or 7350 hand-held binoculars, observers searched in a 140° arc centred along the ships’ heading. Eleven cetacean species and 10 other taxonomic groups were identified along 2,321km of transect effort. The sei whale (Balaenoptera borealis) and sperm whale (Physeter macrocephalus) were the most commonly sighted species (53 a

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5

Kiffner, Christian, Filipa M. D. Paciência, Grace Henrich, et al. "Road-based line distance surveys overestimate densities of olive baboons." PLOS ONE 17, no. 2 (2022): e0263314. http://dx.doi.org/10.1371/journal.pone.0263314.

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Estimating population density and population dynamics is essential for understanding primate ecology and relies on robust methods. While distance sampling theory provides a robust framework for estimating animal abundance, implementing a constrained, non-systematic transect design could bias density estimates. Here, we assessed potential bias associated with line distance sampling surveys along roads based on a case study with olive baboons (Papio anubis) in Lake Manyara National Park (Tanzania). This was achieved by comparing density estimates of olive baboons derived from road transect surve

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6

Lomac-MacNair, Kate S., Ann M. Zoidis, Darren S. Ireland, Meghan E. Rickard, and Kim A. McKown. "Fin, Humpback, and Minke Whale Foraging Events in the New York Bight as Observed from Aerial Surveys, 2017-2020." Aquatic Mammals 48, no. 2 (2022): 142–58. http://dx.doi.org/10.1578/am.48.2.2022.142.

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The fin whale (Balaenoptera physalus), humpback whale (Megaptera novaeangliae), and minke whale (Balaenoptera acutorostrata) are known to occur in the New York Bight (NYB). The primary North Atlantic feeding grounds for these large whale species are commonly recognized to be further north in waters of the Gulf of Maine, eastern Canada, West Greenland, and the eastern North Atlantic (e.g., Iceland, Norway, Ireland, Scotland). Although much is known about their feeding activities in the North Atlantic, relatively little is known about their occurrence and foraging behaviors in mid-Atlantic regio

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7

SANTORO, R., E. SPERONE, M. L. TRINGALI, et al. "Summer Distribution, Relative Abundance and Encounter Rates of Cetaceans in the Mediterranean Waters off Southern Italy (Western Ionian Sea and Southern Tyrrhenian Sea)." Mediterranean Marine Science 16, no. 3 (2015): 613. http://dx.doi.org/10.12681/mms.1007.

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In summer 2010 and summer 2011, weekly cetacean surveys were undertaken in “passing mode”, using ferries as platform of opportunity, along the “fixed line transect” between Catania and Civitavecchia (Southern Italy). Of the 20 species of cetaceans confirmed for the Mediterranean sea, 8 were sighted within the survey period: 7 species represented by Mediterranean subpopulations (Balaenoptera physalus, Physeter macrocephalus, Stenella coeruleoalba, Delphinus delphis, Grampus griseus, Tursiops truncatus and Ziphius cavirostris) and one considered visitor (Steno bredanensis). We had a total of 220

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8

Makbul, Nur Syamimi, Anna Wong, and Lawrence Alan Bansa. "Population assessment and conservation insights of Helmeted Hornbill (Rhinoplax vigil) in Imbak Canyon Conservation Area, Sabah, Malaysian Borneo." Malayan Nature Journall 77, no. 1 & 2 (2025): 53–67. https://doi.org/10.62613/mnj.257712.04.

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Sabah is home to eight of Malaysia's ten hornbill species, yet critical gap remain regarding their distribution and ecology. This study provides a rapid assessment of the Helmeted Hornbill (Rhinoplax vigil) within the Imbak Canyon Conservation Area (ICCA) in Sabah, focusing on its population status, potential threats, and the cultural significance of hornbills among local communities. Using a transect survey method, hornbill presence was recorded through direct and indirect sightings and interviews were conducted with ICCA rangers. While Helmeted Hornbill calls were frequently heard along the

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9

Bellingham, Mark, and Alison Davis. "Forest bird communities in Western Samoa." Notornis 35, no. 2 (1988): 117. https://doi.org/10.63172/744759lglkpx.

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The birds of Upolu and Savai’i, Western Samoa, were surveyed in August 1984. Birds were counted along a 2 km transect in 0 le Pupu-Pu’e National Park and 5-minute bird index counts were used in upland and lowland Savai’i. There was a significant difference in the composition and density of bird communities between partly logged and unmodified tava (Pomeria pinnata) forest. The composition of bird communities differed at varying altitudes both in the national park and in Savai’i. There were more species at higher altitudes on Savai’i, and rare species were recorded at only the higher altitudes

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10

Behangana, Mathias, Wilber Lukwago, Daniele Dendi, Luca Luiselli, and David Ochanda. "Population surveys of Nile crocodiles (Crocodylus niloticus) in the Murchison Falls National Park, Victoria Nile, Uganda." European Journal of Ecology 3, no. 2 (2017): 67–76. http://dx.doi.org/10.1515/eje-2017-0015.

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Abstract1. A 12-month-long survey (April 2013 to March 2014) for Nile crocodiles (Crocodylus niloticus) was conducted along a section of the Victoria Nile/Ramsar site of Murchison Falls National Park, in order to update the historic information on crocodile populations in the area, locating nesting areas, determining seasonality patterns and habitat use, and assess the current abundance and the population size trends since the 1960s. The methods employed included visual encounter surveys, transect counts and opportunistic methods, by using boats. 2. In general, there were diurnal and seasonal

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