analisis komparatif menunjukkan pola penggunaan
terumbu karang Karibia lebih dalam bagi spesies hiu
Kelompok pemijahan dapat mendorong penggunaan
habitat predator untuk hiu lemon , dapat menginformasikan management perikanan
Date:
May 4, 2016
Source:
PLOS
Summary:
Tiga spesies hiu , harimau , lemon dan karang Karibia , semua menggunakan terumbu karang yang lebih dalam di Kepulauan Virgin , tetapi hanya kehadiran hiu lemon yang dikaitkan dengan agregasi pemijahan kerapu musinan , menurut sebuah studi baru .
..................
Tiga spesies hiu, harimau, lemon dan karang Karibia, semua menggunakan terumbu karang yang lebih dalam di Kepulauan Virgin, tetapi hanya kehadiran hiu lemon yang dikaitkan dengan agregasi pemijahan kerapu musiman, menurut sebuah penelitian yang diterbitkan 4 Mei 2016 dalam jurnal akses terbuka PLoS ONE oleh Alexandria Pickard dari Nova Southeastern University, Florida, Bradley Wetherbee of the University of Rhode Island and colleagues.
Kerapu dan ikan lainnya sering bertelur bersama di terumbu karang pada kedalaman antara 30 dan 150 meter di Karibia, dan agregasi ini dapat membuat mereka mudah bagi predator. Namun, sedikit yang diketahui tentang ekosistem karang di kedalaman ini bila dibandingkan dengan terumbu karang yang dangkal. Untuk mengukur pola pertumbuhannya untuk penggunaan terumbu selama tiga spesies hiu, penulis dari studi ini menganalisis data dari pemancar akustik yang ditempatkan pada 18 hiu - 6 hiu lemon, 10 hiu macan, dan 2 hiu karang Karibia - yang dilacak dengan penerima akustik seluas lebih dari 1.000 kilometer persegi di dekat pulau St Thomas.
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Comparative
analysis reveals use patterns of deeper Caribbean coral reefs by shark species
Group spawning may drive predator habitat use for lemon sharks, may inform
fisheries management
Date:
May 4, 2016
Source:
PLOS
Summary:
Three species of shark, tiger, lemon and Caribbean reef, all use deeper
coral reefs in the Virgin Islands, but only lemon shark presence was associated
with seasonal grouper spawning aggregations, according to a new study.
..................
Three species of shark, tiger, lemon and Caribbean reef, all use deeper
coral reefs in the Virgin Islands, but only lemon shark presence was associated
with seasonal grouper spawning aggregations, according to a study published May
4, 2016 in the open-access journal PLOS ONE by Alexandria
Pickard from Nova Southeastern University, Florida, Bradley Wetherbee of the
University of Rhode Island and colleagues.
Groupers and other fish often spawn together in coral reefs at depths
between 30 and 150 meters in the Caribbean, and these aggregations may make
them easy pickings for predators. However, little is known about coral
ecosystems at these depths when compared to shallow coral reefs. To quantify
spatio-temporal patterns of reef use for three species of shark, the authors of
this study analyzed data from acoustic transmitters placed on 18 sharks--6
lemon sharks, 10 tiger sharks, and 2 Caribbean reef sharks--that were tracked
with acoustic receivers covering an area of more than 1,000 square kilometers
near the island of St. Thomas.
The authors found that all three species were present year-round in deeper
coral reefs, but shark use patterns differed. While only two Caribbean reef
sharks were tracked, both had a small range typical of the species that was not
associated with the presence of spawning groupers. The range of lemon and tiger
sharks was about 100 times greater, but only the lemon sharks showed increased
activity in spots where groupers were actively spawning. Though the study
included only a small number of sharks monitored over varying lengths of time,
the findings may suggest that fish prey location may influence movements of
their shark predators, and that group spawning events may shape ecosystem
dynamics in deeper coral reefs.
Bradley Wetherbee, a co-author of the study, notes, "Our study
demonstrates that every member of a community has its own unique role or niche.
Even though three species of sharks might be found in the same place at the
same time on a reef, they are all doing different things and interact with
other species in different ways."
Story Source:
The above post is reprinted from materials provided by PLOS.Note: Materials
may be edited for content and length.
Journal Reference:
1.
Alexandria E. Pickard, Jeremy J. Vaudo, Bradley M. Wetherbee, Richard S.
Nemeth, Jeremiah B. Blondeau, Elizabeth A. Kadison, Mahmood S. Shivji. Comparative
Use of a Caribbean Mesophotic Coral Ecosystem and Association with Fish
Spawning Aggregations by Three Species of Shark. PLOS ONE,
2016; 11 (5): e0151221 DOI: 10.1371/journal.pone.0151221
Sumber :