Modeling Distribution and Abundance of Antarctic Baleen Whales Using Ships of Opportunity

Williams, Rob; Hedley, Sharon L.; Hammond, Philip S.

doi:10.5751/es-01534-110101

Cited by 114 publications

(110 citation statements)

References 39 publications

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“…Research into producing reliable variance estimates for spatial model predictions has been identified as a priority for cetacean distribution studies (Williams et al 2006). One of the conditions for this is that the variance in the data themselves is properly modelled.…”

Section: Discussionmentioning

confidence: 99%

“…In accordance with, e.g., Williams et al (2006), we use GAMs, while paying careful attention to controlling for error dispersion by using quasi-binomial methods (for presence/absence data). In addition, we show that spatial autocorrelation can be included explicitly in order to select more parsimonious cetacean-habitat models.…”

Section: Introductionmentioning

confidence: 99%

“…To overcome this problem, many cetacean distribution studies have used generalised additive models (GAMs) that can fit non-parametric smoothing functions of the data (see e.g. Forney 2000, Redfern et al 2006, Williams et al 2006.…”

Section: Introductionmentioning

confidence: 99%

“…More importantly, cetacean surveys rarely follow systematic designs in space and time, due to specific logistical constraints, especially when conducted from opportunistic platforms (Williams et al 2006). Therefore, sampling effort is typically heterogeneous and needs to be carefully accounted for (Redfern et al 2006).…”

Section: Introductionmentioning

confidence: 99%

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Summer spatial distribution of cetaceans in the Strait of Gibraltar in relation to the oceanographic context

Stephanis¹,

Cornulier²,

Verborgh³

et al. 2008

Mar. Ecol. Prog. Ser.

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The Strait of Gibraltar, the only passage between the Mediterranean Sea and the Atlantic Ocean, and characterised by a surface inflow of Atlantic waters and a deep outflow of Mediterranean waters, is inhabited by a large number of cetacean species. The present study focuses on the occurrence and the spatial distribution of cetacean species within the strait in relation to oceanographic features. Shipboard visual surveys were conducted during the summers of 2001 to 2004, covering 4926 km. A total of 616 sightings of 7 cetacean species were made. The spatial distributions of 6 species (short-beaked common dolphins Delphinus delphis, striped dolphins Stenella coeruleoalba, bottlenose dolphins Tursiops truncatus, long-finned pilot whales Globicephala melas, sperm whales Physeter macrocephalus and killer whales Orcinus orca) were examined with respect to depth and slope. The analyses indicate that these species could be ordered into 3 groups. A first group, with a northward tendency, is composed of common and striped dolphins. Due to its at-sea location and feeding habits, this group is likely to feed on mesopelagic fishes or squids associated with the surface Atlantic waters. The second group, constituted by bottlenose dolphins, long-finned pilot whales and sperm whales, is mainly found over the deep waters of the central part of the strait. While the foraging ecology of bottlenose dolphins is still unclear, both sperm whales and pilot whales are most likely to feed on squids occurring in deep Mediterranean waters. The third group, formed by killer whales Orcinus orca, was associated with blue fin tuna Thunnus thynnus fisheries in the southwestern part of the strait. KEY WORDS: Cetacean · Strait of Gibraltar · Spatial distribution · Feeding ecology · Fisheries interactionResale or republication not permitted without written consent of the publisher

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Summer spatial distribution of cetaceans in the Strait of Gibraltar in relation to the oceanographic context

Stephanis¹,

Cornulier²,

Verborgh³

et al. 2008

Mar. Ecol. Prog. Ser.

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“…About half of those articles are part of the regular issue, and those remaining appear as part of special features. The articles in the regular issue cover topics ranging from methods for species-based assessment and management of baleen whales in the Antarctic (Williams et al 2006) to the reintroduction of wild boar in Europe (Fern&#0225ndez et al 2006), the temporal stability of artisanal coastal fishing areas in Brazil (Begossi 2006), an economic evaluation of the pollination service in relation to coffee growing in Ecuador and Indonesia (Olschewski et al 2006), and the use of utility theory for conservation (Davis et al 2006).…”

Section: Regular Articlesmentioning

confidence: 99%

Generating and Fostering Novelty

Gunderson¹,

Folke²,

Janssen³

2006

E&S

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Tourism informing conservation: The distribution of four dolphin species varies with calf presence and increases their vulnerability to vessel traffic in the four‐island region of Maui, Hawai‘i

Self

Stack

Currie

et al. 2021

Ecol Sol and Evidence

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1. We need reliable information about the spatial and temporal distribution of mobile species to effectively manage anthropogenic impacts to which they are exposed.Yet, we often cannot sustain dedicated annual surveys and data obtained from platforms of opportunity offer an alternative avenue to understand where these species spend time.2. Four odontocete species that occur in the four-island region of Maui, Hawai'i, USA, are vulnerable to a range of human activities, but there is a lack of information regarding their distribution. We therefore do not know the extent of the risk these activities present for the conservation of these species (bottlenose dolphins, spinner dolphins, Pantropical spotted dolphins and false killer whales).3. We used a cross-validated maximum entropy (MaxEnt) occupancy model to estimate the distribution of these four species in an area extensively observed from platforms of opportunity (PoP). We then determined in a similar fashion whether the calves of those species were more likely to be observed in particular areas and whether distribution changed with season.4. Maxent models relying on local environmental variables described dolphin observations well (AUC > 0.7). Their distribution differed for all species when calves were present, indicating that different environmental variables describe area use for schools with calves present.5. The number of sighting events of all species varied significantly with season. Bottlenose dolphins and false killer whales were more prevalent in winter, while spotted and spinner dolphins were more prevalent in summer.6. We show that an overlap in the distribution of dolphin schools with calves and vessel traffic in the region could result in collision and chronic stress risks. This suggests a need for specific regulations for mitigating anthropogenic influences, such as acoustic disturbance or chronic energetic disturbance from vessel traffic.This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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Modeling Distribution and Abundance of Antarctic Baleen Whales Using Ships of Opportunity

Cited by 114 publications

References 39 publications

Summer spatial distribution of cetaceans in the Strait of Gibraltar in relation to the oceanographic context

Summer spatial distribution of cetaceans in the Strait of Gibraltar in relation to the oceanographic context

Generating and Fostering Novelty

Tourism informing conservation: The distribution of four dolphin species varies with calf presence and increases their vulnerability to vessel traffic in the four‐island region of Maui, Hawai‘i

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