Behavior and Ecology of the Bottlenose Dolphin at Sanibel Island, Florida

Shane, Susan H.

doi:10.1016/b978-0-12-440280-5.50016-0

Cited by 325 publications

(354 citation statements)

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“…The movement of the individuals on the surface is like a feeding rush that suggests a fishing activity, similar to that which occurs with other small cetaceans. In some circumstances, the group moves slowly in the same area with a variable direction, in an activity possibly related to the search for prey, with sporadic captures [= exploratory fishing by SHANE (1990)]. On some occasions, the individuals slide their bodies laterally at the moment they dive, probably positioning their sonar.…”

Section: Resultsmentioning

confidence: 99%

“…The fishing activity of the franciscanas in shallow areas close to the margin may represent a way to facilitate the capture of prey. The use of barriers to capture fish is already known for other coastal species, such as Tursiops truncatus (Montagu, 1821) (IRVINE et al 1981, SANTOS & LACERDA 1987, SHANE 1990 and S. guianensis (MONTEIRO-FILHO 1995). The water surface may also be used as a barrier, when the dolphins bring the shoal from the bottom to capture the fish at the waterline, a move made easier by shallow areas (WÜRSIG 1986).…”

Section: Discussionmentioning

confidence: 99%

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The occurrence of Pontoporia blainvillei (Gervais & d'Orbigny) (Cetacea, Pontoporiidae) in an estuarine area in southern Brazil

Cremer

Simões‐Lopes

2005

Rev. Bras. Zool.

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The toninha, or franciscana, Pontoporia blainvillei (Gervais & D'Orbigny, 1844), is an endemic species of cetacean of the southwestern Atlantic Ocean. There is little information on the occurrence of this species in its natural environment due to the great difficulty in sighting it. Systematized and non-systematized observations of franciscanas were made from December 1996 through November 2001 at Babitonga Bay, on the northern coast of Santa Catarina State, southern Brazil. The observations were made from small motorboats. A total of 79 observations were made, totaling 561 individuals. Up to 59.5% of the groups consisted of over four individuals and the average group size was seven. Calves were present in 30.4% of the observations. The species was found throughout the year within the bay and preferential areas were identified. Calves were registered during all seasons. Data are presented on the behavior (feeding, traveling, aerial behavior and behavior relating to the boats) and on inter-specific interactions with terns, cormorants [Phalacrocorax brasilianus (Gmelin, 1789)] and brown boobies [Sula leucogaster (Boddaert, 1783)]. The species is sympatric with the estuarine dolphin Sotalia guianensis (P. J. Van Bénéden, 1864) in the bay, but there was no record of interaction between them. The area of the bay represents an important refuge for the franciscana species.

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Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

The occurrence of Pontoporia blainvillei (Gervais & d'Orbigny) (Cetacea, Pontoporiidae) in an estuarine area in southern Brazil

Cremer

Simões‐Lopes

2005

Rev. Bras. Zool.

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“…The general behavioral pattern suggested for most bottlenose dolphin communities is: Travelling > Socialization or Feeding > Resting > Evasion (Morteo 2002). Feeding has been reported as a common activity in many dolphin communities (Shane 1990;Bräger 1993; -2009. Line thickness shows the values for coefficients of association between dyads.…”

Section: Discussionmentioning

confidence: 99%

“…Aggregations in animals are widely variable in size and composition, and their study is closely linked to the criteria used to define their limits (Shane et al 1986;Wells et al 1987;Shane 1990;Wells 1991;Smolker et al 1992;Bejder et al 1998;Whitehead 1999;Connor et al 2000;Mareike 2003;Morteo 2011). The number of individuals in a group has been related to advantages while overcoming selective pressures, including but not limited to protection against harassment and predation, improving food acquisition and energy efficiency, thus leading to enhanced reproductive output (Wells et al 1980;Shane et al 1986;Mareike 2003).…”

Section: Discussionmentioning

confidence: 99%

“…When dolphins were sighted, the survey was paused to allow habituation (10 min) while their location was recorded using a GPS (Garmin eTrex Legend). Dolphins were then observed until their behavior was determined ad libitum (Altmann 1974) and classified into one of the most commonly used categories which were: 1) Feeding, 2) Socializing, 3) Traveling, 4) Avoiding, 5) Resting, and 6) Undetermined, following the literature (see Shane 1990;Bräger 1993;Chilvers and Corkeron 2002;Constantine et al 2004;Steiner 2011). Subsequently, the group was approached with caution to avoid disturbing them, at the time that group size was estimated; we used an inclusive definition of group, consisting in all dolphins observed in apparent association, moving in the same direction and often, but not always, engaged in the same activity (Bräger et al 1994); however, some groups included only one dolphin (Fazioli et al 2006).…”

Section: Methodsmentioning

confidence: 99%

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Inter-individual association levels correlate to behavioral diversity in coastal bottlenose dolphins (Tursiops truncatus) from the Southwestern Gulf of Mexico

Vital

Morteo

Serrano

et al. 2015

Therya

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Las asociaciones entre individuos se correlacionan con la diversidad de las conductas en delfines costeros (Tursiops truncatus) del Sureste del Golfo de MéxicoInter-individual association levels correlate to behavioral diversity in coastal bottlenose dolphins (Tursiops truncatus) from the Southwestern Gulf of Mexico Introduction: Societies in mammal species are influenced by intrinsic and extrinsic factors that affect the temporality of the associations among individuals. Coastal bottlenose dolphins generally live in small fluid aggregations variable in composition, but the nature of their associations is commonly unknown. Our goal was to determine if school size was influenced by dolphins' behavior, and if individuals associated to develop particular activities within the coastal waters of Alvarado, Mexico. Methods:In total, 80 boat-based surveys were conducted (2002 -2003 and 2006 -2009), where group size, behavior, and photo-identification data were collected. From 237 sightings and 2,021 dolphins the mean school size was 8.5 animals (s. d. = 8.6), but individuals and pairs were observed more frequently (33 %).Results: Temporal differences in school sizes and behavior conveyed with habitat seasonality (P < 0.05), but were inconsistent across years; thus short-term factors such as marine traffic and fisheries intensity were deemed important. Dolphins were commonly feeding (29 %) corresponding to groups of 4 -6 animals, whereas solitary individuals typically showed evasion (P < 0.01). Discussion and Conclusions:Association coefficients computed for 89 of the 232 identifiable dolphins proved not random only in 6 % of the 3,915 combinations (P < 0.05), and these coefficients were positively correlated to the diversity of activities developed by each dyad (P < 0.01), thus the nature of their associations in most cases (93 %) became richer with time. The community is likely formed by very small units that frequently exchange members; this may be due to large food availability and low predator abundance in the area, but also to avoid detection and threats posed by local artisanal fisheries.

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Fish farming and its appeal to common bottlenose dolphins: modelling habitat use in a Mediterranean embayment

Bonizzoni

Furey

Pirotta

et al. 2013

Aquatic Conservation

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1. Common bottlenose dolphins Tursiops truncatus interact with fish farms in the Mediterranean Sea. These interactions were investigated in a Greek bay by incorporating multiple geographic, bathymetric, oceanographic, and anthropogenic variables. 2. Generalized additive models (GAMs) and generalized estimation equations (GEEs) were used to describe dolphin presence. Visual surveys were conducted over 2909 km under favourable viewing conditions that included 54 dolphin group follows for 457 km. Sea surface temperature (SST) and chlorophyll‐a (Chl‐a) data were obtained from remote sensing imagery, and distances to sources of human influences including fish farms, a ferro‐nickel plant, and a slag disposal area were calculated within a geographic information system (GIS). 3. Bottlenose dolphins were encountered mainly in the south‐eastern portion of the study area, and occurrence was not clearly related to SST and Chl‐a, nor the ferro‐nickel plant or nearby slag disposal area. 4. Dolphin occurrence generally increased within 20 km of fish farms, with four farms and dolphins displaying a positive relationship, seven no clear relationship, and two a negative one. 5. While it is likely that uneaten food and other detritus attract dolphin prey, individual farms (or clusters of farms) clearly had a different appeal. The proximity of the ferro‐nickel plant and slag disposal area to ‘attractive’ fish farms could compromise dolphin health, but physiological data are unavailable. 6. The modelling of multiple variables allowed for a description of dolphin habitat use and attraction to some fish farms. More such data analysed in similar manner would be instructive for other areas where marine mammals and fish farms co‐occur. Copyright © 2013 John Wiley & Sons, Ltd.

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Behavior and Ecology of the Bottlenose Dolphin at Sanibel Island, Florida

Cited by 325 publications

References 13 publications

The occurrence of Pontoporia blainvillei (Gervais & d'Orbigny) (Cetacea, Pontoporiidae) in an estuarine area in southern Brazil

The occurrence of Pontoporia blainvillei (Gervais & d'Orbigny) (Cetacea, Pontoporiidae) in an estuarine area in southern Brazil

Inter-individual association levels correlate to behavioral diversity in coastal bottlenose dolphins (Tursiops truncatus) from the Southwestern Gulf of Mexico

Fish farming and its appeal to common bottlenose dolphins: modelling habitat use in a Mediterranean embayment

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