New PDF release: A guide to the common sea fishes of southern Africa

By Rudy Van der Elst

ISBN-10: 1868253945

ISBN-13: 9781868253944

Книга характеризует более чем three hundred видов рыб, которых можно наиболее часто увидеть либо поймать в прибрежных районах Южной Африки. Каждый раздел, посвященный определенному виду, включает детальное описание, полноцветную фотографию, заметки по образу жизни, включая многие малоизвестные и интересные аспекты поведения, карты локального распространения и встречаемости в мире, наиболее современные ограничения в отношения ловли. Книга будет полезна всем, кто интересуется рыбами и рыбалкой.
Доп. информация: Файл является рипом с сайта Google Books. Этим определяется отсутствие некоторых страниц (до 20% от общего числа) и невысокое разрешение сканирования (около a hundred dpi).

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Extra resources for A guide to the common sea fishes of southern Africa

Sample text

In such cases, the template may be generated by learning or through self-referencing where a receiver matches its own cues to that of a sender. Recognition systems, as in other 18 2 Mechanisms: Social Recognition and Social Organisation contexts within the field of animal communication, may be subject to conflict. For example, the sender may attempt to manipulate the receiver in order to exploit it. There are many examples of this among social insects where non-colony members have evolved means of interfering with the recognition systems of a host species in order to gain access to a colony.

Using the binary-choice approach, the authors found evidence of social attraction in the prawn, but not in the shrimp, suggesting social attraction as the means by which aggregations form in these species. ’s (2005) study of sheep (Ovis aries), which again revealed strong evidence of social attraction but also evidence for sex-biased social attraction between peer males which relates to social segregation of the sexes in free-ranging flocks. The binary-choice approach can also be used to make fine-scale manipulations of aspects of the cues available to a choosing animal in order to determine precisely what component of an overall cue is attractive.

Two obvious examples of this are the ability of penguins to locate and identify their own offspring in the crowded and often cacophonous conditions of the rookery by acoustic cues alone (Robisson et al. 1993; Jouventin et al. 1999). Dolphins produce signature whistles, calls that encode their own identity and which are used by receivers to enable individual recognition and also to promote group cohesion (Sayigh et al. 1999; Janik et al. 2006). In contrast to other animals whose calls contain individual elements, but where the individuality is primarily a by-product of anatomical or physiological differences, bottlenose dolphins (Tursiops truncatus) encode their individuality by modulating the frequency of their whistles (Kershenbaum et al.

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A guide to the common sea fishes of southern Africa by Rudy Van der Elst

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