Home eBooks Download › humpback whales of the southern gulf of maine

Humpback Whales Of The Southern Gulf Of Maine

Download Humpback Whales Of The Southern Gulf Of Maine PDF/ePub or read online books in Mobi eBooks. Click Download or Read Online button to get Humpback Whales Of The Southern Gulf Of Maine book now. This website allows unlimited access to, at the time of writing, more than 1.5 million titles, including hundreds of thousands of titles in various foreign languages. If the content not found or just blank you must refresh this page

Humpback Whales Of The Southern Gulf Of Maine

DOWNLOAD
Author : Charles A. Mayo
language : en
Publisher:
Release Date : 1985

Humpback Whales Of The Southern Gulf Of Maine written by Charles A. Mayo and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1985 with Cetacea categories.

Whales Of The Gulf Of Maine

DOWNLOAD
Author :
language : en
Publisher:
Release Date : 1985

Whales Of The Gulf Of Maine written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1985 with Finback whale categories.

Spatial Association Of Humpback Whales Megaptera Novaeangliae And Their Prey In The Southern Gulf Of Maine Usa

DOWNLOAD
Author : Theresa Kirchner
language : en
Publisher:
Release Date : 2016

Spatial Association Of Humpback Whales Megaptera Novaeangliae And Their Prey In The Southern Gulf Of Maine Usa written by Theresa Kirchner and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with Ammodytes categories.

Efficient foraging strategies result in a predator spatially overlapping with its prey, foraging in the most profitable patches, and minimizing the time transiting between patches. Previous studies investigating baleen whale foraging strategies have generally focused on investigating spatial overlap with prey patches, patch profitability or movement within feeding grounds. The present study investigated the fine-scale strategies of movement between individual prey schools and larger prey patches in humpback whales (Megaptera novaeangliae) bubble-feeding on sand lance (Ammodytes spp.) in and around the Stellwagen Bank National Marine Sanctuary, USA. The goal was to investigate the presence of hierarchically nested spatial structures in both sand lance patches and whale bubble-feeding behavior, and to compare the scales and geometry of these patches between predator and prey behavior on each hierarchical scale. Furthermore, the profitability of sand lance schools in feeding areas was investigated. Using animal-borne tag technology to record underwater movement of whales in combination with surface observations of whale behavior, the locations of bubble-feeding events were identified. Concurrent hydroacoustic measurements of the prey distribution in the water column were used to identify the locations and energetic parameters of sand lance schools around tagged whales. First Passage Time analysis was used to determine the spatial scale of individual bubble-feeding events. Based on spatial proximity, feeding events and prey schools were grouped into larger feeding bouts and prey patches to investigate the presence of hierarchically nested scales. Up to three hierarchy levels were found in bubble-feeding behavior of nine whales tagged on six days between 2008 and 2012, and up to five hierarchy levels in the sand lance prey field around the tagged whales. There was a significant positive correlation between the lengths of whale bubble-feeding bouts and the lengths of sand lance patches over three common hierarchy levels. On each hierarchy level, the lengths of whale bubble-feeding bouts were significantly smaller than those of sand lance patches. Mean inter-feeding bout distances were significantly positively correlated with mean inter-prey patch distances over two hierarchy levels. Mean distances between feeding events were similar to the mean distances between prey schools. On larger hierarchy levels, mean inter-bout distances were greater than mean distances among prey patches. Mean school height and density tended to be greater in schools recorded inside than outside of feeding bout areas. The prey field structures found here were likely a result of the specific habitat requirements of sand lance. The results of this study suggest that the tagged whales were able to adapt their foraging movement to the structure of the prey field. By feeding on neighboring schools, whales could minimize the time spent between prey schools. On larger spatial scales, whales did not feed on neighboring prey patches. This could be a result of decreased abilities to find the nearest patch, or because, rather than restricting their foraging movement to neighboring patches, the whales were targeting specific patches. The foraging movement observed in this study led to spatial overlap of the tagged whales with sand lance schools that were characterized by properties rendering them more energetically profitable for bubble-feeding whales. While hierarchically structured foraging movement has been found in other marine predators, this is the first study that demonstrates this kind of foraging mechanism for baleen whales.

Structure And Dynamics Of The Gulf Of Maine Humpback Whale Population

DOWNLOAD
Author : Julie Robbins
language : en
Publisher:
Release Date : 2007

Structure And Dynamics Of The Gulf Of Maine Humpback Whale Population written by Julie Robbins and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with Animal populations categories.

The Effect Of Group Size On Individual Roles And The Potential For Cooperation In Group Bubble Net Feeding Humpback Whales Megaptera Novaeangliae

DOWNLOAD
Author : Natalie Mastick
language : en
Publisher:
Release Date : 2016

The Effect Of Group Size On Individual Roles And The Potential For Cooperation In Group Bubble Net Feeding Humpback Whales Megaptera Novaeangliae written by Natalie Mastick and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with Humpback whale categories.

Group foraging is observed in many species as a means to increase the ability of members of the group to find and exploit patchy prey. Group foraging can be exhibited in a number of different contexts based on the relationships between the participants, including by-product mutualism. One variant of by-product mutualism is cooperation, in which individuals achieve a greater energetic gain by feeding together than they would alone. In cooperation, individuals adopt a role in the group, and in the most complex interactions there may be multiple roles, resulting in a division of labor that occasionally includes role specialization. Humpback whales (Megaptera novaeangliae) are one of the few baleen whale species that have been observed feeding in groups, utilizing behaviors that are hypothesized to be cooperative. One of these behaviors is group bubble-net feeding, which has been observed in the Northeastern Pacific, Northwestern Atlantic, and Southern Oceans. This study utilized multi-sensor archival tag data from 26 humpback whales from the southern Gulf of Maine, 4 from Southeast Alaska, and 1 from the Western Antarctic Peninsula to analyze individual bubble-net feeding behaviors and compare these across populations. Linear mixed effects models were used to determine if dive behaviors varied with group sizes to test the hypothesis that group size influences individual behavior. The results indicate that individuals in the southern Gulf of Maine, for which sufficient data were available, were consistent in their bubble-net feeding behaviors across group sizes, which suggests that individuals utilize set roles in group feeding events. There was evidence for a division of labor and role specialization among whales utilizing certain bubble-net feeding tactics in the southern Gulf of Maine. The three populations performed different variations of bubble-net feeding that are likely based on the speed and schooling patterns of the prey. The results are consistent with the hypothesis that bubble-net feeding is an example of by-product mutualism in these populations, though was not enough data to suggest that group bubble-net feeding in Southeast Alaska was a form of by-product mutualism. The prevalence of herding dives in feeding groups suggest that each individual takes on a role to herd the prey to the surface, and provide evidence against a producer-scrounger relationship in the southern Gulf of Maine, and potentially in the Western Antarctic Peninsula.

Wings In The Sea

DOWNLOAD
Author : Lois King Winn
language : en
Publisher:
Release Date : 1985

Wings In The Sea written by Lois King Winn and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1985 with Humpback whale categories.

Whale watchers & armchair naturalists will join scientists & environmentalists in welcoming this excellent illustrated introduction to the humpback.