Results 31 to 40 of about 3,861 (176)

Consumer diversity drives stronger predation in tropical marine communities

Ecography, EarlyView.
Biotic interactions are predicted to be stronger in the tropics compared to higher latitudes, contributing to observed patterns of global biodiversity. While increased consumer diversity and more complex food webs are expected in tropical communities, the trophic dynamics underlying strong regional effects of predation are not well understood.
Michele F. Repetto, Gregory M. Ruiz, Mark E. Torchin, Mariana Bonfim, Amy L. Freestone   +4 more
wiley   +1 more source

Chemical Investigation of the Indonesian Tunicate Polycarpa aurata and Evaluation of the Effects Against Schistosoma mansoni of the Novel Alkaloids Polyaurines A and B

Marine Drugs, 2019
A deep study of the metabolic content of the tunicate Polycarpa aurata, collected from Indonesian coast, afforded the isolation of two novel alkaloids, polyaurines A (1) and B (2), along with two new p-substituted benzoyl derivatives (3 and 4) and four ...
Marcello Casertano, Concetta Imperatore, Paolo Luciano, Anna Aiello, Masteria Yunovilsa Putra, Roberto Gimmelli, Giovina Ruberti, Marialuisa Menna   +7 more
doaj   +1 more source

ParaHox Genes Revisited: From Gut Patterning to Integrated Axial and Neural Organization in Rotifera

Journal of Experimental Zoology Part B: Molecular and Developmental Evolution, EarlyView.
In rotifers, ParaHox genes show a dispersed genomic organization, with Xlox absent across gnathiferans. Exclusive neuronal expression of Gsx and Cdx reveals that ancestral ParaHox genes coordinated neural and epithelial development beyond gut patterning, suggesting an integrated role in early bilaterian body plan organization.
Andreas C. Fröbius, David B. Mark Welch, Holger Herlyn   +2 more
wiley   +1 more source

Benthic megafauna and the functioning of macroalgal forests and urchin barrens

Oikos, EarlyView.
Two temperate rocky reef food‐web models, representing the trophic diversity of the Mediterranean rocky reef communities, were built for the two stable states: macroalgal forests and barren grounds, which are characterized by opposite amounts of erect macroalgal biomass.
Chiara Bonaviri, Davide Agnetta, Stefania Pinna, Luigi Piazzi, Fabio Badalamenti, Giulia Ceccherelli, Davide Iaciofano, Manfredi Di Lorenzo, Francesco Di Trapani, Sabrina Lo Brutto, Vesna Mačić, Anna Maria Mannino, Francesco Mura, Luigi Musco, Laura Tamburello, Tomás Vega Fernández, Salvatrice Vizzini, Trevor Willis, Paola Gianguzza   +18 more
wiley   +1 more source

Incorporating environmental DNA metabarcoding for improved benthic biodiversity and habitat mapping

Remote Sensing in Ecology and Conservation, EarlyView.
Seafloor imagery is commonly used to collect information about the distribution of benthic organisms in order to generate habitat and biodiversity maps. Recent advances in genomics (e.g., environmental DNA; eDNA) show potential to complement video surveys for habitat mapping, but there have been few examples testing this.
Rylan J. Command, Shreya Nemani, Benjamin Misiuk, Mehrdad Hajibabaei, Nicole Fahner, Emily Porter, Greg Singer, Beverly McClenaghan, Katleen Robert   +8 more
wiley   +1 more source

Ascidians Collected in Tanzania

Journal of East African Natural History, 1997
Ascidians were collected in Tanzania in January 1996 by SCUBA diving. Among 31 species reported here, nine are new. Several species were also recently collected in Mozambique. Full descriptions are given with figures and colour plates. The present collection of Tanzanian ascidians significantly increases the number of species known in the tropical ...
Monniot, Françoise, Monniot, Claude
openaire   +2 more sources

The Embryonic Development of the Cotylean Polyclad Phrikoceros jannetae

Acta Zoologica, EarlyView.
ABSTRACT Polyclads exhibit distinct developmental modes ranging from direct to indirect development, with several transitional stages also recognised. The existence of an indirect developmental mode in polyclads with a planktonic life history stage in the form of a free‐swimming larva is unique among all free‐living flatworms and makes polyclads a ...
Mehrez Gammoudi, Bernhard Egger, Isabel L. Dittmann, Verónica N. Bulnes, Pavel Tomancak, Abdel Halim Harrath, Johannes Girstmair   +6 more
wiley   +1 more source

Depth-wise variations in biofouling community development on aquaculture cage nets in the Red Sea

Egyptian Journal of Aquatic Research
This study examined the development of biofouling assemblages on cage net panels submerged at different depths in a fish farm in the Red Sea. Experimental rafts equipped with Dyneema fibre nets were submerged at depths of 5, 10 and 15  m.
S. Satheesh, A.A.J. Kumar, Mohammed Broom, Eduardo Padilla Yáñez, M.M. El-Sherbiny   +4 more
doaj   +1 more source

Ascidian Sperm Lysin System [PDF]

Zoological Science, 2002
Fertilization is a precisely controlled process involving many gamete molecules in sperm binding to and penetration through the extracellular matrix of the egg. After sperm bind to the extracellular matrix (vitelline coat), they undergo the acrosome reaction which exposes and partially releases a lytic agent called "lysin" to digest the vitelline coat ...
openaire   +2 more sources

Evaluating and Advancing the Use of Shore‐Based Observers for Scientific Sampling and Catch Verification in High‐Volume Fisheries

Fisheries Management and Ecology, EarlyView.
ABSTRACT Shore‐based observers are increasingly being used in place of at‐sea observers to monitor and sample commercial fisheries catch. However, few evaluations assess whether these programs meet their stated goals or how to optimize them, and industry data are rarely tested for accuracy despite serving as the foundation for catch accounting. Using a
Christian Gredzens, Andy Kingham, Jason E. Jannot   +2 more
wiley   +1 more source